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Free Focus Stacking Software For Mac

Automatic focus bracketing android app for phone camera

Zerene Stacker Vs Helicon Focus

Best Focus Stacking Software 2020

Free Focus Stacking Software For Mac

I am trying to look for an android app to automatically take focus bracketed photos with my smartphone. I am looking for the best way to make my Galaxy S7 phone with tripod automatically take a user-defined number of photos along a user-defined range of focus, that are ready to be imported into a focus stacking software like PS or Zerene Stacker WeMacro's automatic focus stacking rail has total travel length of 100 mm. It's minimum step can be set as 1 micron in precise mode. The rail is fully controlled by a computer, or an android phone using Bluetooth or OTG functionality. iPhone's app is available in the App Store! Search WeMacro and you will find it Yesterday, I finally took some time to look for focus stacking apps that will work on my Google Pixel 2 XL - an Android OS phone (Google invented Android OS). I was looking for an app that generally did what Nikon's full-frame D850 does with its focus stacking feature Android/Mobile Focus Stacking. Hi all! I am trying to find an android focus stacking app. Not sure it is possible yet because I can't seem to find anything that will take manual or auto focused shots, align them, and stack all from a mobile device FocusStacker is designed for use in landscape and architectural photography. In its speed, elegance and accuracy, it fits the needs of professional photographers, who'll be happy to know that at its heart lies the sophisticated optimization algorithm originally developed for the OptimumCS-Pro app, adapted here to the taking of multiple shots

. Rule600 calculator. Sky stacking helper. Custom profiles. Remote control over wireless network (Android devices must be on same network Picolay is a focusstacking software with multiple uses. It can perform image processing, create slide shows, make animated GIF images, and more I am developing a piano app, currently I am working on something to make my buttons play their sounds while user slides his finger over them. To achieve this, I've chosen onFocusChangeListener. It is not the part, in which i am adding sounds into, but right now i am to make buttons work as an example. Unfortuntely, I have got a couple of errors Classic Focus Stacking App. Classic focus stacking is the method of capture used by the original CamRanger. It is also an option with CamRanger mini and CamRanger 2, and can be turned on or off from within the app settings. Sony cameras can only use classic focus stacking, most notably all Sony cameras. Near and far positions are not set

When it comes to controlling your camera, the CamRanger 2 software is available on Android, iPad/iPhone, MacOS, and Windows platforms. Install the app on your phone, tablet, or desktop and gain control of your camera to fine tune focus from up to 500 feet away from your CamRanger 2 but I'm not able to give this focus. I tried with FocusScope -> Listview - > focus node but it is not giving exact behaviour in first and last index, and also it's not working in the homepage where multiple listviews are there. android flutter listview focus android-tv. asked 2 mins ago. Aviraj Patel During a transient loss of audio focus, you should continue to monitor changes in audio focus and be prepared to resume normal playback when you regain the focus. When the blocking app abandons focus, you receive a callback (AUDIOFOCUS_GAIN). At this point, you can restore the volume to normal level or restart playback. Permanent loss of focus

By shooting multiple photos at different focus distances and then combining them, the app allows users to capture images with a greater depth of field than a single iPhone snap may allow. After.. Android Apps/Applications Mobile Development. This example demonstrates how do I bring an activity to the foreground (top of stack) in android. Step 1 −Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main.xml The description of StackOverflow App. Founded in 2008, Stack Overflow is the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. More than 50 million professional and aspiring programmers visit Stack Overflow each month to help solve coding problems, develop new skills, and find job. When the user touches an icon in the app launcher (or a shortcut on the Home screen), that app's task comes to the foreground. If no task exists for the app (the app has not been used recently), then a new task is created and the main activity for that app opens as the root activity in the stack

Hugin is a free panorama stitcher that also includes Focus Stacking - it runs on Linux, Windows & Mac so no problems there. Facilities include alignment correction, so that if you are not using a tripod you can still stack without problems. To quote the manual. ImageJ is a free java application that can be freely downloaded from here, and also does focus stacking with imageJ extended depth field module. ImageJ is written in Java and runs on Linux, Mac OS X and Windows, in both 32-bit and 64-bit modes. Top free Landscape Design Software For Mac have been recorded underneath: 1. Live Home 3D Pro. Previous Article 7+ Best Free Focus Stacking Software 2021 List.

Wemacro Rail - focus stacking with wemacr

This tech stack for android app enables you to focus entirely on building high quality and unique apps. With help of the Android Developer Tools, you will be able to gain complete support for the whole Android app development process Photoshop Master Remakes a Masterpiece. Animal Instincts. Bring Out the Best In Your Photos with the New Lightroom for Mobile. The Dreamy, Long-Exposure Photos of Vassilis Tangoulis. free assets. Vintage-Look Photoshop Effects Pack. graphic design. Select part of an image to replace the background Focus Stacking viele Bilder aufnehmen mit verschiedenen Focuspunkten um ein durchgehend scharfes Bild zu erhalten. Die App kann dabei helfen die Aufnahmen zu.. DSLR Remote Control. DSLR Remote Control is the #1 downloaded app that will allow you to remote control and trigger your Canon or Nikon DSLR camera from your phone or tablet with a tethered USB OTG cable or wifi, turn your phone or tablet into a DSLR Controller today! See a live preview on your phone or tablet, adjust shutter speed, aperture.

How to use focus stacking to get sharper shots. 1. Choose your scene and stabilize the camera. Focus stacking requires layering several images over each other — a task that's much easier to do. Helicon Focus - Quick Start (Mac OS X) This short video will demonstrate how Helicon Focus is running on Mac OS - basic focus stacking workflow from opening of the images to saving of the output, useful tips and impressive stacking results. play video ability to automatically change the focus stacking direction at the end; show/hide for the LRTimelapse info display; various fixes; It is rolling out for Android right now. Windows changes: Added ability to use the UsbDK driver. With the UsbDK driver you don't need to install the WinUSB driver anymore for the camera

Programming languages: Java, Kotlin. For developing a native Android mobile app you can use Java or Kotlin. Java is a reputable programming language with vast open-source tools and libraries to help developers. However, Kotlin has become a more stable and congruous development option for Android Studio There is a free android app that allows you to manually adjust focus (and more camera technical stuff for photographers) Its called open camera and can be found on playstore. (the one by mark harman) NOTE: it will only work if your device supports it Focus stacking them in Photoshop would give me one combined frame with the entire watch in focus. As I began getting the frames needed to combine, I started by having the front part of the watch in focus, then gradually changed the focus from the front to the back After days of fiddling and googling I finally noticed that it depends on where the app is initially started from (meaning the first start from when it has been closed before). If I initially start it from the overlay, I can switch to it via overlay without it restarting, but it restarts when using the normal home screen button This is the 'app switcher' of the Android world — here you'll see your most recent tasks and be able to select one to bring it back into the foreground. Okay, that's it. Nothing more to see

Open Camera - A Focus Bracketing (Stacking) App for

‎Focus Stacker combines sharp areas from multiple images into one seamless composite image. The focus stacking is used in macro photography for subjects like flowers, insects, jewelry, in microscope image processing, in landscape photography. The app has an advanced automatic stacking algorithm and

A Google Play Developer Account (which has a one-time $25 fee) gave me access to the Google Play Console, which let me upload my Android app as a .aab file (Android App Bundle), which makes my code understandable by the Android operating system. I released for every feature that I added and utilized the different forms of testing. Conclusio

Android has the concept of audio focus, and only one app can have focus at a time. The app that has audio focus decides what happens to other apps playing audio — either ducking (lowering.

Photoshop or focus-stacking software like Helicon Focus. Step one: set up your shot. Choose your subject. Whether that's a flower, a small object or anything in between, compose your shot to your.

Full stack developers work on coding, debugging, and developing web applications. From the UI of the web page to the database of the servers, full-stack developers take care of it all. They develop websites that offer attractive designs and work smoothly. Full stack developers primarily work in the field of web development

Android/Mobile Focus Stacking : photograph

• Forest is available for Android mobile and tablet devices, and can be accessed across all Android devices with Pro version. To download the non-Android version of Forest requires a separate purchase. However, by logging into the same account, your data can be synchronized across all platforms Android Stack与Task. 0 HOME_STACK_ID Home应用以及recents app所在的栈 So, we let the task go in the fullscreen task if it is the focus stack. // If the freeform or docked stack has focus, and the activity to be launched is resizeable, // we can also put it in the focused stack Main idea is to create a Router implementation related to every nav_graph you have in your app and take advantage of all the support classes Android Jetpack Navigation provides for you. This AppRouter follows the navigation graph shown in the previous image, with all 4 fragment routers required implementations in it As you navigate through an Android app, different stages of an Activity lifecycle come in action. Basically, Activities in Android are seen and treated like an Activity Stack.. To understand this concept better, picture yourself opening an Activity. In an Activity Stack, this newly-opened Activity would be placed on the top of the stack

jonalmeida added a commit to jonalmeida/focus-android that referenced this issue Aug 13, 2021 Close mozilla-mobile#5120 : Warm GeckoEngine first during app creation Verifie L Camera. L Camera is an open-source experimental camera app for Android L devices using the new android.hardware.camera2 API. Currently, the only supported device is Nexus 5 and Nexus 6 running Android 5.0 Lollipop. Please note that this app is intended to test and study new features of the camera API, it is not for general uses as it lacks many basic camera features (location tagging, white.

We can specify the android:process attribute for an application or any other app component based on the requirement. We can use it with activity, service, broadcast receiver, or content provider. When we specify it for an application it will be running on the specified process, however, when the app is in the background system may destroy the application process to reclaim the resources in. Android development is a software creation process that focuses on applications, better known as apps, that are compatible with devices running the Android operating system (OS). Because Android is an open-source project, developers have easy access to the Android software development kit (SDK) Xamarin+C#. Xamarin is an open-source platform developed by Microsoft for building modern and high-performing mobile applications for iOS, Android, and Windows.. Xamarin is commonly believed to be the best framework for mobile app development and the closest to native. Xamarin uses C# and.Net framework to compile a native code into different mobile binaries, thus making Xamarin apps look like. How to disable auto-focus from EditText in Android Studio Usually we have multiple widgets including one or more EditTexts in an Activity or fragment.Every time user opens these Activities the focus automatically goes to the top most edittext and the virtual key board pops up.This hides rest of the UI, which can be very annoying for the user

‎FocusStacker on the App Stor

This modified text is an extract of the original Stack Overflow Documentation created by following contributors and released under CC BY-SA 3.0 This website is not affiliated with Stack Overflow SUPPORT & PARTNER Have you ever wondered Whats happening behind the screnes when you tap an app icon and the app launches..??It creates a stack of Activities.The Activities are Arranged in a stack(The back Stack) in the order in which each activity is opened by the User.For example, an email app might have one activity to show a list of new messages Activity Lifecycle in Android with Demo App. In Android, an activity is referred to as one screen in an application. It is very similar to a single window of any desktop application. An Android app consists of one or more screens or activities. Each activity goes through various stages or a lifecycle and is managed by activity stacks

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With ProGuard, DexGuard or R8 enabled in your Android app, your stack traces must be deobfuscated. App Center automatically deobfuscates stack traces for your Java, Kotlin, and React Native Android apps when you upload the mapping.txt file created on each build. This file maps the original class, method, and field names to the obfuscated names.

g Languages: You broadly have two options here; Kotlin- the official language used by the android app's developer team or Java, the worldwide popular language used by nearly 40.2% of developers (as per Statista)

10+ Free Focus Stacking Software Download for Windows, MAC

An activity is a single, focused thing that the user can do. When a new activity is started, it is placed on the top of the stack and becomes the running activity -- the previous activity always remains below it in the stack, and will not come to the foreground again until the new activity exits. See android.app.SearchManager for more.

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7. Master Android App Data Storage Best Practices. Android provides various methods for data storage based on different user needs and applications. For instance, some Android developers use data storage to track user settings or user-provided data.For this use case, the data can be stored persistently in many ways

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How to do focus stacking with the CamRange

After Active Tab: Opens new tab next to the current active tab (this is the default) As Last Tab: Opens new tab at the end of the tabs. As Tab Stack With Related Tab: Opens a new tab stack with the active tab and the new tab. To find the new setting, go to the V icon > Settings > New Tab Position. Enable or disable Tab Stacks

Run the app. Select the Any CPU configuration and an Android emulator: Press F5 to build and run the project. The Android emulator will start, then Visual Studio will install the app. Finally, the app will start. Enter some text in the Add New Item field, then press enter or click the add item button. The item is added to the list

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. Gmail (Web, Android, iOS) . Don't be surprised that the best free email app comes default on most Android devices. After all, when Google initially released Gmail in 2004, the tech giant has single-handedly redefined personal email by offering a much larger storage capacity than its competitors and delivering the sleekest email experience the world had seen Set Up New Project. 1.1. Open Android Studio and select - Start a new Android Studio project. 1.2. On the Choose your project panel, select - Phone and Tablet > Empty Activity, and then click Next. 1.3. Click Finish. Follow the on-screen instructions if you need to install any plug-ins

CamRanger - Macro Photography & Automatic Focus Stackin

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answers Stack Overflow for Teams Where developers technologists share private knowledge with coworkers Jobs Programming related technical career opportunities Talent Recruit tech talent build your employer brand Advertising Reach developers technologists worldwide About the company Log Sign.. Android technology stack. If you're building a mobile app for Android, here's the core app technology to use. Programming Languages. Java - Java is arguably the most popular language for building Android app. Thanks to its usage by major companies, the language is well-supported and has great scalability. You'll have a wide option of.

Managing audio focus Android Developer

29th March 2017. Android Task and Back Stack Review. Android Activities are the logical construct of the screens that we want a user to navigate through. The relation that each Activity holds with respect to other is very crucial for a good user experience. This relation should be designed with the focus of developing an effortless and pattern.

Audio focus is handled as a stack on the system — as such the last process to request audio focus wins. When audio focus has been gained this is the appropriate time to create a MediaPlayer or MediaRecorder instance and allocate resources. Likewise when an app receives AUDIOFOCUS_LOSS it is goo

Android OS provides a back stack function for Activity, it also provides the back stack function for Fragment. If you add one Fragment into the back stack, when you press the android device back menu, you can find the Fragment that is saved in the back stack popup. Until all saved Fragments in the back Android Fragment Back Stack Example Read More �

In the Android L release, Android TV expects device manufacturers to use systems integrators or the Android solutions for regional TV stacks, pass the surface to TV software stacks, or pass the necessary key code to interact with legacy stacks. Here's how the broadcast app and TV App interact: The TV App is in focus, receiving all keys

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Step Four - Handling Audio Focus. For a good user experience with audio in Android, you need to be careful that your app plays nicely with the system and other apps that also play media

Starting in Android 12, it seems the stock dialer app — which on Pixel phones is the Google Phone app — no longer offers SIP settings. That means you can't add a SIP account or use the stock. BlueStacks app player android emulator download for windows and mac. It is a cloud-based application that connects through online systems. It allows moving file in between Windows and BlueStacks via a shared folder. Ensure to run the sideloading apps on demand. Unlimited apps synchronization, no barrier. Free to all and you won't need to. This example demonstrates how can I know when an EditText loses focus. Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project. Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken one edit text and two buttons. remove.

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imizing pointer use to null safety and mutability checks, Kotlin is a great language for secure development

Android Studio Welcome Screen. To create your new Android project, follow these steps: In the Welcome to Android Studio window, click Start a new Android Studio project. In the Select a Project Template window, select Empty Activity and click Next. In the Configure your project window, complete the following:Enter User Authentication in the Name field

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运行的 Android 版本不同，音频焦点的处理方式也会不同：从 Android 2.2（API 级别 8）开始，应用通过调用 requestAudioFocus() 和 abandonAudioFocus() 来管理音频焦点� Bottom app bars focus on actions while bottom navigation bars focus on navigation to top-level destinations that need to be accessible from anywhere in the app. And they have two obvious differences: Bottom navigation should be used for 3 to 5 destinations, and bottom app bars should be used for 3 to 6 actions (count FAB) From full-stack development to traditional Android development, we excel in crafting end-to-end applications that are built to cater to your distinct business requirements. We provide next-generation digital products, made by our expert developers, with the most advanced technology and years of experience in the Android app development domain Facebook was an early adopter of OkHttp, a networking stack open-sourced by Square, and it's now the stack used by the Android app. OkHttp allows us to support fast retries for intermittent network situations, take advantage of the SPDY protocol for faster concurrent network transmissions, and enable powerful instrumentation across the.

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Mavis beacon typing tutor free download for mac. Free Download Helicon Focus Pro 7 full version for Windows with this focus stacking software you can make your usual camera render results that could not be achieved even with a classic tilt-shift lens. Take several shots at different focus distances instead of just one, and it will quickly and smartly combine the stack into a fully focused image.

Mounted on the camera as a conventional extension tube, Helicon FB Tube automates focus bracketing in single shot and continuous shooting modes. Adjust settings, hold down the shutter button to shoot a stack and process it in Helicon Focus to achieve a perfectly sharp image.

Nowadays micro photography, close-ups, jewelry and product photography became truly dependent on focus stacking. But it does not matter what you shoot – landscapes or flowers, animals or still-life – It will make your images stand out. Watch the tutorials, read the articles and impress your colleagues and friends with your new photo achievements!

Stacking in Helicon Focus. Helicon Focus is supplied by HeliconSoft. I’ve got the ‘Pro’ version, since I use it for my work and with the stackshot rail. There are demo versions available. There are quite a few software packages that offer stacking – I’ve a short list to explore at the foot of this article.

Zerene Stacker Vs Helicon Focus

You can focus stack with any lens and camera, but you need to have the right post-processing software to combine the photos together. I use Photoshop, since that’s what I already own, but there are better programs out there if you do a lot of focus stacking — Helicon Focus and Zerene Stacker being the two main products. Helicon Focus is a program that creates one perfectly focused image from several partially focused images. The program is designed for optic microscope image processing to cope with the shallow. Focus Stacking is a simple technique. It’s easy to learn and easy to implement. The resulting photos, however, can be striking and unique. Read this review to find out if you need focus stacking software like Helicon Focus.

Helicon Focus Discount

Helicon Focus Pro 7 automatically detects the processor type and all available features of modern processors. All the data manipulations are managed with modern processor instructions (SSE, SSE2, AVX, FMA3).

Best Focus Stacking Software 2020

Overview of Helicon Focus Pro 7 Features

Helicon Focus Download

Accurate rendition of colors

Efficient and easy RAW development

State-of-the-art processing algorithms

Advanced interpolation options

Multi-core processing

Stack length is no more a limit

64 bit support

Getting the maximum of your processor

RAW-in-DNG-out mode

Smart retouching

Helping grid

Scientific scale

Split and enqueue stacks

Command line

Smooth integration with Lightroom

Helicon 3d Viewer

Creating a micropanorama

Free Focus Stacking Software For Mac

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holytheoristtastemaker · 5 years ago

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When the world discovered the web, things were unexciting and lifeless. For example, building a simple image mouseover application required several lines of code, and couldn't work on some platforms.

But things got better when jQuery was introduced, since it allowed developers to create stunning JavaScript applications that could run comfortably in various places.

After that, the jQuery team took things a notch higher by developing jQuery UI, which made it possible for developers to create nice-looking web applications on the existing jQuery core.

Better still, in 2010 jQuery Mobile was introduced which has made development much better and more efficient.

Built with a bias to mobile phones, jQuery Mobile is an effective, unified framework that offers UI components, data transitions, and other exciting features.

jQuery Mobile leverages the functionalities of HTML5, CSS3, jQuery, as well as jQuery UI into a single framework that allows developers to achieve consistency across different platforms and devices.

Basic Features of jQuery Mobile

1. Great simplicity and usability

The jQuery Mobile framework is uncomplicated and flexible. Since the framework's configuration interface is mark-up driven, developers can easily build their complete basic application interfaces in HTML, with minimal or no JavaScript code.

Complex tasks requiring several lines of JavaScript code, such as Ajax calls and DOM manipulation, can easily be realized with few lines of code in mobile jQuery.

For example, if we want a user to click and hide some text after a page has been created in the DOM, but before enhancement is complete, we can simply use the pagecreate event handler. This is something that would require several lines code to accomplish without jQuery Mobile.

$(document).on("pagecreate","#mypagetest",function(){ $("span").on("click",function(){ $(this).hide(); }); });

In the above code, the #mypagetest parameter refers to the id of the page that specifies the page event. Also, the on() method is used to attach the event handlers.

Furthermore, its simplicity allows developers to break their applications into multiple pages. With the framework, developers can "write less, and do more."

2. Progressive enhancement and graceful degradation

Progressive enhancement and graceful degradation are key features that propel the agility of jQuery Mobile. They enable it to support both high-end and less capable devices (for example, those lacking JavaScript support).

The framework allows developers to build applications that can be accessed by the widest number of browsers and devices, whether it is Internet Explorer 6 or the newest Android or iPhone.

Mobile jQuery also gives developers the ability to render basic content (as built) on basic devices. And the more sophisticated platforms and browsers will be increasingly enriched using additional, externally linked JavaScript and CSS.

3. Support for user-friendly inputs

During jQuery mobile development, developers can include an uncomplicated API to support touch, mouse, and cursor focus-based user input functionalities. Several types of easily styled and touch-friendly form elements are also included in the framework.

Examples include checkbox and radio sets, slider, search filtering, and menu selection elements. Also, every one of the form elements includes an alternate 'mini' version, which can be easily incorporated into mobile web pages.

For example, here's how to create a checkbox button using jQuery Mobile. Notice that the data-mini="true" attribute is added to create a mini version of the button.

<form> <input type="checkbox" name="checkbox-mini-0" id="my-checkbox" data-mini="true"> <label for="checkbox-mini-0">Click here to agree</label> </form>

Beyond all this, to ensure the user experience is optimized on mobile devices, the framework has a rich Ajax-driven navigation system that allows animated page transitions to take place seamlessly.

With jQuery Mobile transition events, you can animate the transition from the current active page to the new page.

For example, you can use the pagebeforeshow event (triggered on the "to" page) and the pagebeforehide event (triggered on the "from" page) when transitioning from one page to the next. Both events are triggered before the transition animation begins.

Let's see how they can be applied:

$(document).on("pagebeforeshow","#myfirstpage",function(){ // When entering myfirstpage alert("myfirstpage is about to appear"); }); $(document).on("pagebeforehide","#myfirstpage",function(){ // When leaving myfirstpage alert("myfirstpage is about to disappear"); });

4. Accessibility

Besides its cross-platform capabilities, jQuery for mobile was created with a strong consideration for accessibility.

The framework comes with support for Accessible Rich Internet Applications (WAI-ARIA) to assist disabled persons using screen readers and other assistive technologies easily access web pages.

5. Lightweight size

Mobile jQuery's lightweight size (about 40KB when minified) adds to its swiftness. Additionally, the fact that it employs minimal image dependencies also vastly accelerates its capabilities.

6. Theming and UI widgets

jQuery Mobile has an in-built theme system that enables developers to determine their own application styling. With the jQuery Mobile Themeroller, developers can effectively customize their applications to fit their color, tastes, and preferences.

The framework also comes with various innovative, cross-platform widgets that enable developers to create applications that are better customized.

Some of the available widgets are persistent toolbars, buttons, dialogs, and the commonly used popup widget.

7. Responsiveness

The framework's full responsiveness enables the same underlying codebases to fit comfortably in different types of screens, from mobile devices to desktop-sized screens.

Basic Page Structure of jQuery Mobile

jQuery Mobile's structure has all the UI components and attributes required for creating user-friendly and feature-rich mobile web applications and websites of all kinds—whether basic or advanced.

You can use jQuery mobile to build web pages, various types of list views, toolbars, a wide range of form elements and buttons, dialogs, as well as other functionalities.

Importantly, since jQuery Mobile is created on top of jQuery core, it lets developers leverage jQuery UI code and access key facilities. These include robust animation and image effects for web pages, DOM manipulation, event handling, and Ajax for server communication.

Let's get a feel for how jQuery mobile development code looks.

For example, in this time of the COVID-19 pandemic when most people are working from home or from co-working spaces, let's create a simple web page that demonstrates some team management mistakes that people make.

Here is the code:

<!DOCTYPE html> <html> <head> <title>jQuery Mobile Example</title> <meta name="viewport" content="width=device-width, initial-scale=1" /> <link rel="stylesheet" href="http://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css" /> <script src="http://code.jquery.com/jquery-1.11.1.min.js"></script> <script src="http://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script> </head> <body> <div data-role="page" date-theme="c"> <div data-role="header"> <h1>fCC jQuery Mobile Sample</h1> </div> <div data-role="content"> <p>COVID-19 Work-From-Home Team Management Mistakes To Avoid</p> </div> <p> <ul data-role="listview" data-inset="true" data-filter="true"></ul> </p> <p> <ul> <li><a href="#">Using Unnecessary Tools</a></li> <li><a href="#">Foregoing Team Evaluations</a></li> <li><a href="#">Micromanaging</a></li> <li><a href="#">Hiring Too Quickly</a></li> <li><a href="#">Not Having Contingencies</a></li> </ul> </p> <div data-role="footer"> <h4>alfrickopidi.com, 2020 - Copyright</h4> </div> </div> </body> </html>

Here is the output when the above mobile jQuery lines of code are opened on a browser:

Notably, when the browser is decreased or increased, the size of the items in the list also adjusts appropriately. Therefore, the web page can be easily accessed in various devices with different screen resolutions without worrying about lack of consistency. The size of the items will change accordingly to suit the type of device.

As you can see in the above code sample, the document is a simple HTML5 that includes the following three things:

Files from the jQuery Mobile CSS (jquery.mobile-1.4.5.min.css)

Files from the jQuery repository (jquery-1.11.1.min.js)

Files from the jQuery Mobile repository (jquery.mobile-1.4.5.min.js)

These files are directly linked to the jQuery CDN. Another alternative is to head over to the download page to get these files and host them on a private server.

Importantly, including the "viewport" metatag during jQuery mobile development instructs devices that the page width and the device screen width are equivalent (width=device-width).

The tag also instructs the browser to zoom in to 100 per cent (scale=1). If the scale is changed to 2, for instance, the browser will zoom the web page by 50 per cent.

A closer examination of the code reveals some strange "data-"attributes scattered throughout it. This is an improved feature of HTML5 that enables developers to pass organized data across an application – for example, the data-role="header" attribute defines the head section of the web page.

The above example just scratches the surface of the things developers can achieve using jQuery Mobile. The framework's documentation is easy to follow and describes its many features, including linking pages, incorporating animated page transitions, and designing buttons.

Conclusion

jQuery for mobile is a resource-rich framework built with jQuery, HTML5, and CSS capabilities to handle certain cross-platform, cross-device and cross-browser compatibility issues effectively.

The framework offers great opportunities for creating mobile and web applications that are powerful, fully responsive, and future-ready.

Will you give it a try?

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jacob-cs · 5 years ago

Text

kotlin android 개발 날씨앱 만들기 과정 요약

original source : https://www.youtube.com/playlist?list=PLEPZdzLLJH94Jk_Jz-cTUXYFoObPBH7KB

시애틀에 있는 수염난 안경낀 백인 청년 설명

data binding을 위해서 gradle에서 해야할 작업

data binding의 장점

3rd party image loading library들 이 강의에서는 coil을 사용

toolbar를 app bar로 사용하면서 navigation component를 사용하는 경우

tool bar를 app bar로 사용하는 경우 약간의 material 느낌을 주기위해 AppBarLayout를 이용한 경우

coil를 사용해 image loading한경우

json converting을 위해 moshi를 사용한 경우

retrofit

민감한 data를 외부에 놓고 사용하는 방법

외부에서 전달되는 json data의 키와는 다른 field명을 쓰고 싶을때

외부와 data 통신시에 보안을 위해 usesCleartextTraffic을 사용한다.

1강

0:01 - Week 0 Review

1:22 - Syllabus Review

2:40 - Class Announcements

6:14 - Why Learn App Development?

9:26 - Challenges of App Development

15:34 - Types of Mobile Development

22:36 - Why Android Development?

27:42 - Setting Up Our Android Development Environment

28:34 - Installing Android Studio

36:12 - Creating Your First Android Studio Project

39:17 - Creating An Android Emulator

41:52 - Installing Your First Android App

45:14 - Sharing An Android Studio Project to GitHub

50:06 - Building An Android APK

- What are the unique benefits and challenges of Android app development?

- What are some different ways of building mobile apps?

- What makes Android the most popular mobile operating system?

- What is Android Studio?

- What is the Android Emulator?

- What is Kotlin?

- How do you create a new Android project?

- How do you share code from Android Studio to GitHub?

- How do you add a README to your GitHub repo?

2강

0:36 - Outline

1:57 - Android Framework Components

14:07 - What is generated when you create a new Android Studio project?

40:26 - Working with Android Activities

41:20 - Android Activity lifecycle

50:12 - Using the Android Studio debugger // How to set a breakpoint in Android Studio?

59:38 - Creating Interactive User Interfaces

1:01:46 - What is FrameLayout?

1:05:09 - What is LinearLayout?

1:08:34 - What is RelativeLayout?

1:14:22 - What is ConstraintLayout?

1:28:09 - Responding To User Interaction

1:29:00 - ConstraintLayout simple tutorial

1:29:37 - How to create a new Vector Asset in Android Studio?

1:38:46 - How to respond to a Button click in Android

1:40:04 - Android Button setOnClickHandler

1:45:40 - Receiving user input using an EditText

1:54:00 - Customize Material Design theme in Android Studio

- What are the Android app components?

- What is an Android Activity?

- What is generated when we create a new Android Studio project?

- What is the Android Activity lifecycle?

- What is the difference between an Android ViewGroup and a View?

- What is a FrameLayout? LinearLayout? Relative Layout? ConstraintLayout?

- How to build a simple UI using ConstraintLayout?

- How do define an Android click listener?

- How to show a Toast message in an Android Activity?

- How to enable Android developer options?

- How to use an EditText to receive user input?

3강

- How to display dynamic content in an app?

- How to display large collections of data?

- How to architect your app to provide data to your Activity?

- What is MVVM?

- What is LiveData?

- How to model data with Kotlin data classes?

- How to create a RecyclerView Adapter?

- How to bind data using a RecyclerView ViewHolder?

- How to define an onClickHandler for your RecyclerView?

- How to format String resources?

0:25 - Outline

2:17 - Project Demo

3:56 - Displaying Dynamic Data

5:05 - Dynamic view containers // ScrollView, ListView, ViewPager

6:57 - RecyclerView

7:50 - Why RecyclerView?

16:47 - Defining A Data Model

20:00 - Modeling data with Kotlin data classes

24:25 - What is LiveData?

28:08 - Implementing A RecyclerView

29:23 - Creating a data class to model daily weather forecasts

31:50 - Creating a data repository

32:04 - Using LiveData to expose data from a repository

49:54 - Adding a RecyclerView to your layout xml file

52:37 - How to use Logcat to understand why your app crashed

54:58 - Add RecyclerView dependency to your build.gradle file

57:52 - How to add margin to your RecyclerView using ConstraintLayout design view?

1:01:57 - How to implement a RecyclerView Adapter using Kotlin?

1:30:38 - Add touch feedback to RecyclerView list items

1:40:00 - How to format String resources?

4강

- How to create a new Android Activity?

- How to use an Intent to open a new Activity when a button is clicked?

- How to display an options Menu

- How to respond to a Menu item click?

- How to display an AlertDialog?

- How to save a value using SharedPreferences?

5강

- How to create a new Fragment

- How to migrate UI/logic from an Activity to a Fragment

- How to communicate between a Fragment and an Activity

- How to add a FloatingActionButton to your UI

6강

- What is the Android Navigation Architecture Component?

- What problems is it trying to solve?

- How to create a navigation graph?

- How to add new destinations and actions to your navigation graph?

- How to navigate to a new Fragment using the NavController?

- How to update your AppBar based on navigation changes?

- How to implement a BottomNavigationView?

7강

- How to load data from a remote api using Retrofit; an HTTP client library for Android/JVM?

- How to listen to changes in SharedPreferences values?

- How to load and display remote images using the Coil image loading library

#kotlin #android #weather

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vlemonn · 8 years ago

Video

In this video we are going to implement a custom ListView for our Electronic Shop android app. Our custom ListView contains an ImageView for displaying product image, two TextView for product name and product price, Two ImageButton for increment and decrements the quantity of the product to purchase and finally an EditText to display product quantity selected by end user.

For Complete Source Code and Code to copy please visit below blog Post.

Blog Post: https://vlemonn.com/Blog/Android/Android-Custom-ListView-with-ImageView-EditText-and-Button

If you want to download complete project download button is the bottom of the article.

Key Points 1. ListView 2. Adapter 3. getView function 4. What is convertView 4. Click listener

Note: If source code is not updated please let us know.

Support Us: PayPal: https://www.paypal.me/vlemonn Patreon: https://www.patreon.com/vlemonn

Useful URL: Our Website: https://vlemonn.com Blog Post: https://vlemonn.com/Blog/Android/Android-Custom-ListView-with-ImageView-EditText-and-Button Facebook: https://www.facebook.com/vLemonn Twitter: https://www.facebook.com/vLemonn Google Plus: https://plus.google.com/112993831877465971811

#Android #Android Tutorial #ListView #Click Listener #Custom ListView #Android Free Tutorial #Free Tutorial #Tutorial #free #vlemonn #Mayank Sanghvi

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siva3155 · 6 years ago

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300+ TOP XAMARIN Interview Questions and Answers

XAMARIN Interview Questions for Freshers and experienced :-

1. What is Xamarin? Xamarin is a developing technology which is used to build UI for Android, iOS, and Windows operating systems using only CQ. 2. What are the extensions of Xamarin applications? For Android applications, the extension is .apk and for iOS, it is .app. 3. On what platforms you can work? Android and iOS are the two most popular operating systems on which I can work. 4. What are the languages that Xamarin support for developing any application? Xamarin is a cross-platform technology which supports FQ and CQ for application development. 5. In an application where you need to require the calculation of shortest distance, then which algorithm will be used? In that case, the best algorithm to use is the depth first search algorithm. 6. What are the different ways to make Xamarin apps? Mainly, there are two ways to get the job done. The first is the Xamarin.forms, and the other one is the traditional Xamarin approach. 7. How to decide which way to use to Xamarin apps? For all those applications where you either code sharing is the priority rather than unique UI or that need very less custom functionality, then Xamarin.froms can be used. On the other hand, you can use Xamarin native for all those apps where custom UI is the priority or you have to make custom interactions. 8. Do you know about application package modes? There are two modes to choose from. The first one is the release mode and the other one is debug. Both of them have their own requirements and are used when necessary. 9. Mention the different Xamarin.forms techniques to share codes. Shared projects and PCL are ways to share codes. 10. Elaborate on the use of page in Xamarin.forms. The page is an element which covers almost the entire screen and only has one child. For Android, Windows, and iOS, it is an activity, page, and view controller respectively.

XAMARIN Interview Questions 11. Tell us about Xamarin.forms pages. There are several pages in Xamarin.forms and they are used as per their requirements. Some of them are tabbedpage, contentpage, and carouselpage. 12. Explain views. Views are just another word for widgets. Some of the views are an image, list view, button and label. 13. Can you differentiate between TableView and ListView? The major difference between the both is that TableView shows data in a horizontal manner whereas ListView shows data in a vertical manner. 14. Why cells are used in Xamarin.forms? Cells are parts that are specifically created to be attached to TableView or ListView. 15. How editor is different from entry? The primary motive of both of these features is to assist the user in entering text. However, the major difference is that the editor has several lines and entry has only a single line. 16. Explain data binding. It is a method where a user interface synchronizes automatically with the data source. It shows all the updates automatically to the user interface. Mainly, it focuses on target as well as the sources. 17. Are you aware of the techniques used in data binding. Yes, there are four different techniques for data binding. Twoway, oneway, default, and onewaytosource. 18. What do you know about TestFlight? TeshFlight is a method by which you can best test your applications designed for iOS. 19. Why Hockeyapp is used? Hockeyapp is a service which is used to test iOS, windows and android apps. 20. Do you know about NuGet? Yes, NuGet is a package manager of .NET development. It is not just any other manager, but the most widely used one. 21. What are Activities? Activities offer a platform for the user interface which is graphical and only has one screen. 22. What are Native Apps? Native apps are those which require specific language for their development. This language can be Java, CQ, or swift. 23. What are Cross-Platform apps? Cross-platform apps are those which are developed for all the three mobile platforms with a single code base. However, they need personalization in the user interface as per the operating system. 24. What are the reasons to use XAML? XAML is a language used by developers which helps them in specifying the UI with the help of markup instead of any code. 25. What are the reasons to avoid XAML? Even though XAML is a great technique, but still it has some disadvantages. The reason why it should be avoided is that it does not has any code. Moreover, you cannot define loops of conditional processing. 26. Define Grid Grid is a layout control in Xamarin.forms which displays information in columns and rows. 27. What is ContentPresenter? ContentPresenter is used to view templates. It helps in managing how the content appears. 28. What is padding property? Padding is always added from the internal part of the element and directly affects the content away from the edges. 29. What is margin property? Margin is the opposite of padding which is executed from the outside of the element and affects how distant the content is from other contents. 30. Mention situations where you can use data binding. Data mining has different scenarios where it can be used. Model binding, collection binding, and backward binding are some of the scenarios. 31. Xamarin history? Xamarin is a Microsoft-owned San Francisco, California based software company founded in May 2011 by the engineers that created Mono, Mono for Android and MonoTouch . Novell had granted a perpetual license for Mono on july 2011 for MONO On May 16, 2011: Miguel de Icaza announced on his blog that Mono would be developed and supported by Xamarin, December 2012, Xamarin released Xamarin.Mac which allows developers to build C#-based applications for the Apple OS X operating system and package them for publishing via the Apple App Store. Xamarin 2.0 was released in February 2013 Xamarin.Android and Xamarin.iOS that make it possible to do native Android, iOS and Windows development in C#, with either Visual Studio or Xamarin Studio. Xamarin.forms: Introduced in Xamarin 3 on May 28, 2014 and allows one to use portable controls subsets that are mapped to native controls of Android, iOS and Windows Phone. On February 24, 2016: Microsoft announced it signed a definitive agreement to acquire Xamarin On March 30, 2016: Microsoft acquired the xamarin. And made it for all with free of cost. 32. What are disadvantage of Xaml in Xamarin.Forms? XAML cannot contain code. All event handlers must be defined in a code file. XAML cannot contain loops for repetitive processing. (However,ListView —can generate multiple children based on the objects in its ItemsSource collection.) XAML cannot contain conditional processing (However, a data-binding can reference a code-based binding converter that effectively allows some conditional processing.) XAML generally cannot instantiate classes that do not define a parameterless constructor. (However there is sometimes a way around this restriction.) XAML generally cannot call methods. (Again, this restriction can sometimes be overcome.) 33. When to use Xamarin.Forms vs Xamarin Native? Xamarin.Forms: Apps that require little platform-specific functionality. Apps where code sharing is more important than custom UI. Xamarin.IOS,Xamarin.Android: Apps that require specialized interactions. Apps with highly polished design. Apps that use many platform-specific APIs. Apps where custom UI is more important than code sharing. 34. What is is the difference between ListView & TableView? The ListView and TableView controls are so similar, you can think of them as a single control. The major difference between the two is the manner in which they lay out their items, and it’s easy to change the layout so each control emulates the other. The ListView control displays its data stacked vertically, much like a standard listbox. Use this control to display an ordered list of data, especially long lists that require scrolling like a list of email messages, a list of contacts, or search results. The TableView control displays its data stacked horizontally in rows (although you can alter this behavior and have it displayed in columns first, as well). You use this control when you need more space for rich visualization of each item to be displayed. One of the big differences is ListView provides you a ItemsSource and a Itemtemplate and TableView does not. So items must be added as children manually. 35. What are the layout controls available in Xamarin.Forms? Layout is the process of sizing and positioning child elements in UI. ContentPresenter: A layout manager for templated views. Used within a ControlTemplate to mark where the content to be presented appears. ContentView: An element with a single content. ContentView has very little use of its own. Its purpose is to serve as a base class for user-defined compound views. Frame: An element containing a single child, with some framing options. Frame have a default Xamarin.Forms.Layout.Padding of 20. ScrollView: An element capable of scrolling if it's Content requires. TemplatedView: An element that displays content with a control template, and the base class for ContentView. AbsoluteLayout: Positions child elements at absolute requested positions. User assigned anchors and bounds defines the position and size of the control. Grid: A layout containing views arranged in rows and columns. RelativeLayout: A Layout that uses Constraints to layout its children. StackLayout: A Layout that positions child elements in a single line which can be oriented vertically or horizontally. This layout will set the child bounds automatically during a layout cycle. User assigned bounds will be overwritten and thus should not be set on a child element by the user. XAMARIN Questions and Answers Pdf Download Read the full article

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shophub · 6 years ago

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Material Design UI Android Template App

This delightful Android UI Design with thought to give engineers a simple and viable approach to make their applications additionally lovely. With this Android UI Design layout, you don't have to free your valuable time to set up pre-structured realistic – it did for you from the beginning of this android UI kit! All components are enlivened with Android Material Design Template and made by their directions. Additionally, all components are accessible to be utilized in more seasoned variants of Android so you don't need a costly cell phone to have a great Material plan. You can without much of a stretch execute parts from Android UI kit just by following our gigantic and efficient documentation. Your's is simply to code, this app design template will do the structure. Simple as cake. Glad coding!

Full component list Tabs – Five subjects of tabs, and five new sections prepared to utilize. Open Source ventures utilized in these components: Universal Image Loader, Pager Sliding Tab Strip. Wizards – Five topics of wizards and five new parts prepared to utilize. Open Source ventures utilized in these components: Universal Image Loader. Custom Dialogs – Six subjects of custom exchanges, prepared to utilize. Open Source ventures utilized in these components: Universal Image Loader. ListViews – Six renditions of ListViews, as Expandable rundown, Drag&Drop, Swipe-to-expel, Appearance movement, Sticky rundown headers, Google Cards. All prepared for use in a delightful Material plan style. Open Source ventures utilized in this component: Universal Image Loader, Ken Burns View, Material Ripple Layout, ListView Animations, Sticky List Headers, Animated Expandable ListView. Parallax Effect – Parallax picture impact joined with rundown see with Ken Burns impact. Open Source ventures utilized in this component: Universal Image Loader, Ken Burns View, Material Ripple Layout, Pull Zoom View, Not Boring ActionBar. Left Menu – Two adaptations of the left menu with Material structure, prepared to utilize. Open Source ventures utilized: Universal Image Loader, Material Ripple Layout. Login Page – Login page in dull and light forms, with vivified letters, prepared to utilize. Open Source ventures utilized: Float Labeled Text Field, Material Ripple Layout. Picture Gallery – Two kinds of GridViews with pictures for display, with fresh out of the plastic new plan and delightful selector. Open Source ventures utilized: Universal Image Loader, Material Ripple Layout. Shape Image Views – Eight present-day states of picture sees for your symbols, profile pictures, etc. Open Source ventures utilized: Universal Image Loader, Shape Image View. Advancement Bars – 14 sorts of round and catch advance bars and loaders arranged for your application. Open Source ventures utilized: Progress Wheel, Circular Progress Button. . Check Buttons – Dark and light forms of checkboxes enlivened by Material structure. Open Source ventures utilized: Material Ripple Layout. Sprinkle Screen – Three forms of lovely planned and enlivened sprinkle screen. Open Source ventures utilized: Universal Image Loader, Ken Burns View. Content perspectives – Prepared typography by Google guidelines for TextView. Hunt bars – Dark and light pursuit bar with inquiry recommendations arranged to put in your application. Open Source ventures utilized: Material Ripple Layout. Symbols – a wide scope of free Fontello symbols. Symbols are included by means of Fontello – not any more four distinctive measured PNGs. In our task is 46 symbol in .svg design. Bound together realistic – every single realistic component is motivated by Android Lollipop Material Design. All components arranged in one shading style to finish your application. Simple hues changing – hues are variable in one XML and essential shading for all designs and components are alterable in one line. Completed components and formats prepared to utilize – prepared XML documents and drawables for use in your application. Numerous components have activity as well as straightforwardness – wonderful straightforward movements which are increasingly prominent. All components and designs take a shot at old variants of Android (from 4.4 rendition) as well – each component has its very own AndroidMainfest.xml document with characterized minSDK. Characterize typefaces and textual styles through XMLs – no more need to make text styles from resources organizer.

Read the full article

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captainlenfan · 6 years ago

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New Post has been published on https://fitnesstech.website/product/letscom-fitness-tracker-with-heart-rate-monitor-watch-activity-tracker/

LETSCOM Fitness Tracker with Heart Rate Monitor Watch, Activity Tracker

HomeNew ArrivalsEnding SoonAbout UsShippingReturnsPaymentContactFAST SHIPPINGOn All Items30 DAYS MONEYBACKHassle Free ReturnsCUSTOMER SUPPORTExcellent Service100% SATISFACTIONSatisfaction Guarenteed LETSCOM Fitness Tracker with Heart Rate Monitor Watch, Activity Tracker with Step Counter, Pedometer, Calorie Counter Watch for Android and iOS Smart PhoneDESCRIPTIONUse this Letscom fitness tracker with our well-designed app VeryFitPro, which is compatible with iOS 7.1/Android 4.4 or later smartphones. BT 4.0 or later are also required. Feature Description: Call Notification: The tracker vibrates and caller ID is displayed on screen when there is an incoming call. You can hang up calls using only the tracker. SNS Notification: Receive notifications from other apps (Facebook, WhatsApp, LinkedIn, Instagram, and Twitter) on your tracker screen. Photo Shooting: Operation on the screen could remotely control photography shooting. Waterproof Rating: IP67 life-level waterproof, sweat-proof, rain-proof. Not for showering, swimming or diving. Wrist Sense: Tracker screen is lighted up when you turn your wrist towards you. SPECIFICATIONS: Model: ID130 HRCPU: Nordic nRF52832-QFAASensor: KIONIX KX022-1020HR Sensor: silicon labs Si1142Screen: 0.96 inch OLEDMaterial: upper casing: PC; strap: TPE Dimension: suits for wrist size: 5.4 inch – 7.6 inch Battery type: Li BatteryBattery capacity: 65mAh Working time: 5-10 daysCharging method: USB chargingCharging time: 1-2 hoursWeight: 0.8oz (22.6g)ABOUT US We offer the best prices around on high quality products. Our E-store includes media such as books, movies, music and games while offering electronics, toys, sporting apparel, clothing, tools, general home, garden items and more.CUSTOMER SATISFACTION We try over very best to make sure every customer is completely satisfied. If there’s a problem, message us! We’re happy to help.SHIPPING TERMS We are always working hard to ensure your package arrives as soon as possible. Please understand that some factors like weather, high postal traffic, and the performance of shipping companies are outside of our control. Read MoreRETURNS POLICY We offer a 30-Day Return Policy on items in which you are not completely satisfied with. You have the option of a full-refund or an exchange of the item. No returns are available on items shipped outside of the USAELECTRONICS All electronics we sell are designed to run on 110-120V unless stated otherwise. These were manufactured to be used in the USA. Use outside of the USA at your own risk.TAXES We have distribution centers that charge taxes on sales in the following states: AL, AZ, CA, CO, CT, FL, GA, IL, IN, IA, KS, KY, LA, MA, MD, MI, MN, MO, MS, NC, ND, NE, NJ, NV, NY, OH, PA, SC, SD, TN, TX, UT, VA, VT, WA, WI, AND WY.ADDITIONAL INFO Packaging may not be the same as shown in the image. Manufacturers sometimes update their packaging without notifying us. We do our best to update the images in a timely manner. SUBSCRIBE TO OUR NEWSLETTERJOIN NOWSTORE PAGESHomeAbout UsPaymentShippingReturnsUSEFUL LINKSView ShopAdd to favorite SellerJoin our Mailing ListView FeedbackContact SellerWE ACCEPTCONTACT USOur dedicated staff is happy to help. Less than 24 hour response time. Copyright Â© 2017 busybear. | All Rights Reserved

Brand: LETSCOM

MPN: Letscom

ISBN: Does not apply

UPC: 643824555068

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estimote · 8 years ago

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How Mirror works: first look at developing for Mirror

We're getting closer to ship the first dev kits of Mirror, the world's first video beacon, and we want to take this opportunity to start introducing you to the Mirror technology.

In this post, we'll give you a sneak-peek of how Mirror works and the philosophy behind some of that. Most importantly though, you'll learn what all of this means for building first Mirror-powered experiences!

Some of the things we mention in this post are still work in progress and might change—but it should still give you a general idea of where it's all headed!

Sourcing the context for the smart screen

Our mission for Estimote Mirror is to turn screens into smart "assistants", showing personalized content based on who's nearby, where they are, what objects they're interacting with, etc. To make this possible, something needs to feed Mirror with that data.

This is why, much like with regular beacons, the smartphone and the mobile app are still at the heart of it all.

Your airline app knows where you're flying to. Your shopping list app knows what products you're looking for. Your running app knows whether you're a marathoner or sprinter.

This makes it possible to

highlight your flight info at the airport screen, direct you to the right aisle from the supermarket's screen, or suggest the right shoes for you right there at a screen in a sportswear store.

You don't have to pull the smartphone out of your pocket, but it's still silently doing the job of making sure you're shown just the right information.

This is why, when your Mirror dev kit arrives, it'll be coming with iOS and Android SDKs.

Side note: we also have other sources of context in mind for Mirror. If you've seen our Mirror video, you know that it can also interact with Estimote Stickers. We're REALLY excited about this, and we'll be covering that in a separate post in the future.

Mobile Mirror SDK, your "remote" for Mirror

The mobile SDKs for Mirror are about more than just feeding Mirror with user data. In fact, they're in full control of what to show on Mirror:

When the user comes near the screen, the mobile Mirror SDK will establish a Bluetooth link between the smartphone and the Mirror, and tell it to display the view however you programmed it (uploading the assets if necessary).

There's no need to upload any "Mirror apps" to the Mirror itself—your mobile app is the ultimate remote for Mirror.

A sneak-peek at one of our Mirror demos!

This makes it easy to get started: just drop some code into your mobile app, the way you always do—Swift, Java, Obj-C, Kotlin, your call. Iterating? Submit a new version of your app to the app store. The next time the user comes in range of Mirror, they'll immediately see the updated experience. You could have a thousand Mirrors deployed in locations with no WiFi, and yes, all it takes is distributing an updated version of your mobile app—a problem already solved by iOS and Android.

Built-in views, custom views

At the heart of developing for Mirror are the Mirror views (e.g., the TextView shown above), so let's also talk about that for a moment.

Mirror uses a subset of HTML5 and CSS3 to render its UI, and the Mirror views are ready-made pieces of HTML that are stored on the Mirror's flash drive. The mobile SDK can then invoke any of these views when in range of Mirror, filling the blanks in.

Much like iOS or Android's collection of built-in components (UITableView, ListView, etc.), we'll be baking our own collection into the Mirror OS itself: text view, table view, image view, etc. We're spending a lot of time fine-tuning them to work great on the big screen, so that you don't have to. However, we are also making sure these views are extremely customizable. Colors, backgrounds, fonts, image on the left or on the right, these things are up to you.

Finally, you can always build and upload your own, hand-crafted, custom views to Mirror. Write some HTML/CSS/JS, test in a regular web browser, add a few placeholders to be filled in later by the mobile app, deploy to Mirror. Front-end web developers should feel at home!

Thoughts?

We hope you enjoyed this preview into what developing for Mirror looks like—we certainly are excited to be sharing it with you. Let us know what you think on our forums, or by dropping us a note to [email protected]. We're eager to hear your feedback!

Piotr Krawiec, Head of Developer Experience at Estimote

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probelalkhan · 8 years ago

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New Post has been published on Simplified Coding

New Post has been published on https://www.simplifiedcoding.net/android-sync-sqlite-database-with-server/

Android Sync SQLite Database with Server using PHP and MySQL

Lets learn Android Sync SQLite Database with Server. Assume we have to send some information from the application to our webserver and internet is not available on the device at a particular time. So instead of giving error to the user that internet is not available we can store the data to SQLite and send it later automatically when the internet is available. And this is what we are going to learn in this Android Sync SQLite Database with Server Tutorial.

Contents

1 Android Sync Sqlite Database with Server Demo

2 Creating Web Service and MySQL Database

2.1 Creating Database

2.2 Creating Web Service

2.2.1 Creating Script

2.2.2 Testing Script

3 Android Sync SQLite Database with Server

3.1 Creating Android Project

3.2 Adding Permissions

3.3 Adding Dependencies

3.4 Handling SQLite Operations

3.5 Handling Volley RequestQueue

3.6 Building Interface

3.6.1 MainActivity

3.6.2 ListView

3.7 Building ListView

3.7.1 Model Class

3.7.2 Adapter

3.8 Coding MainActivity

3.9 Detecting Network State

3.9.1 Creating Broadcast Receiver

3.9.2 Adding Receiver in Manifest

3.9.3 Registering Receiver

4 Testing the Application

5 Download Source Code

Android Sync Sqlite Database with Server Demo

You can first see what we are going to learn in this video where I am showing the application.

youtube

Now lets move ahead and start Android Sync Sqlite Database with Server.

Creating Web Service and MySQL Database

Creating Database

I have the following database. I am using XAMPP you can use anything you want.

So we have the database table. Now we will create a php script that will handle the insertion to the database.

Creating Web Service

Creating Script

Create folder in your root directory (in my case it is htdocs).

Now create a php file inside the folder, I have created saveName.php. And write the following code.

<?php /* * Database Constants * Make sure you are putting the values according to your database here */ define('DB_HOST','localhost'); define('DB_USERNAME','root'); define('DB_PASSWORD',''); define('DB_NAME', 'android'); //Connecting to the database $conn = new mysqli(DB_HOST, DB_USERNAME, DB_PASSWORD, DB_NAME); //checking the successful connection if($conn->connect_error) die("Connection failed: " . $conn->connect_error); //making an array to store the response $response = array(); //if there is a post request move ahead if($_SERVER['REQUEST_METHOD']=='POST') //getting the name from request $name = $_POST['name']; //creating a statement to insert to database $stmt = $conn->prepare("INSERT INTO names (name) VALUES (?)"); //binding the parameter to statement $stmt->bind_param("s", $name); //if data inserts successfully if($stmt->execute()) //making success response $response['error'] = false; $response['message'] = 'Name saved successfully'; else //if not making failure response $response['error'] = true; $response['message'] = 'Please try later'; else $response['error'] = true; $response['message'] = "Invalid request"; //displaying the data in json format echo json_encode($response);

Testing Script

Now its time to test the script we created. So in my case the URL is http://localhost/SqliteSync/saveName.php

I am using POSTMAN to test the script and you can see it in below screenshot.

As you can see the script is working fine. Now lets move ahead in android project.

Android Sync SQLite Database with Server

Creating Android Project

Create a new project.

I have created AndroidMySQLSync with an Empty Activity.

Adding Permissions

We need the following permissions so first add these to AndroidManifest.xml.

<uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Adding Dependencies

For network requests I am going to use Volley. So add the following line inside dependencies block of your app level build.gradle file.

dependencies compile fileTree(dir: 'libs', include: ['*.jar']) androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', exclude group: 'com.android.support', module: 'support-annotations' ) compile 'com.android.support:appcompat-v7:25.0.1' //add this line compile 'com.android.volley:volley:1.0.0' testCompile 'junit:junit:4.12'

Handling SQLite Operations

In this case we have to use both SQLite and MySQL. So a class named DatabaseHelper.java and write the following code.

package net.simplifiedcoding.androidmysqlsync; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; /** * Created by Belal on 1/27/2017. */ public class DatabaseHelper extends SQLiteOpenHelper //Constants for Database name, table name, and column names public static final String DB_NAME = "NamesDB"; public static final String TABLE_NAME = "names"; public static final String COLUMN_ID = "id"; public static final String COLUMN_NAME = "name"; public static final String COLUMN_STATUS = "status"; //database version private static final int DB_VERSION = 1; //Constructor public DatabaseHelper(Context context) super(context, DB_NAME, null, DB_VERSION); //creating the database @Override public void onCreate(SQLiteDatabase db) String sql = "CREATE TABLE " + TABLE_NAME + "(" + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COLUMN_NAME + " VARCHAR, " + COLUMN_STATUS + " TINYINT);"; db.execSQL(sql); //upgrading the database @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) String sql = "DROP TABLE IF EXISTS Persons"; db.execSQL(sql); onCreate(db); /* * This method is taking two arguments * first one is the name that is to be saved * second one is the status * 0 means the name is synced with the server * 1 means the name is not synced with the server * */ public boolean addName(String name, int status) SQLiteDatabase db = this.getWritableDatabase(); ContentValues contentValues = new ContentValues(); contentValues.put(COLUMN_NAME, name); contentValues.put(COLUMN_STATUS, status); db.insert(TABLE_NAME, null, contentValues); db.close(); return true; /* * This method taking two arguments * first one is the id of the name for which * we have to update the sync status * and the second one is the status that will be changed * */ public boolean updateNameStatus(int id, int status) SQLiteDatabase db = this.getWritableDatabase(); ContentValues contentValues = new ContentValues(); contentValues.put(COLUMN_STATUS, status); db.update(TABLE_NAME, contentValues, COLUMN_ID + "=" + id, null); db.close(); return true; /* * this method will give us all the name stored in sqlite * */ public Cursor getNames() SQLiteDatabase db = this.getReadableDatabase(); String sql = "SELECT * FROM " + TABLE_NAME + " ORDER BY " + COLUMN_ID + " ASC;"; Cursor c = db.rawQuery(sql, null); return c; /* * this method is for getting all the unsynced name * so that we can sync it with database * */ public Cursor getUnsyncedNames() SQLiteDatabase db = this.getReadableDatabase(); String sql = "SELECT * FROM " + TABLE_NAME + " WHERE " + COLUMN_STATUS + " = 0;"; Cursor c = db.rawQuery(sql, null); return c;

Handling Volley RequestQueue

We are going to use Volley for http request. So for this we will create a singleton class.

Create a class named VolleySingleton and write the following code.

package net.simplifiedcoding.androidmysqlsync; import android.content.Context; import android.graphics.Bitmap; import android.support.v4.util.LruCache; import com.android.volley.Request; import com.android.volley.RequestQueue; import com.android.volley.toolbox.ImageLoader; import com.android.volley.toolbox.Volley; /** * Created by Belal on 21/09/16. */ public class VolleySingleton private static VolleySingleton mInstance; private RequestQueue mRequestQueue; private static Context mCtx; private VolleySingleton(Context context) mCtx = context; mRequestQueue = getRequestQueue(); public static synchronized VolleySingleton getInstance(Context context) if (mInstance == null) mInstance = new VolleySingleton(context); return mInstance; public RequestQueue getRequestQueue() if (mRequestQueue == null) // getApplicationContext() is key, it keeps you from leaking the // Activity or BroadcastReceiver if someone passes one in. mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext()); return mRequestQueue; public <T> void addToRequestQueue(Request<T> req) getRequestQueue().add(req);

Building Interface

MainActivity

Now inside activity_main.xml write the following code.

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="net.simplifiedcoding.androidmysqlsync.MainActivity"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <EditText android:id="@+id/editTextName" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_weight="3" android:hint="Enter a name" /> <Button android:id="@+id/buttonSave" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_weight="1" android:text="Save" /> </LinearLayout> <ListView android:id="@+id/listViewNames" android:layout_width="match_parent" android:layout_height="wrap_content"></ListView> </LinearLayout>

The above code will generate the following output.

Android Sync SQLite Database with Server

As you can see we have an EditText, a Button and a ListView.

Now let me tell you what we are going to do. We will save the Name from EditText and we will also display the saved name in ListView with the Sync Status. So the next part is designing a layout for our Custom ListView.

ListView

Create an xml file inside layout directory. I have created names.xml.

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:padding="@dimen/activity_horizontal_margin" android:layout_width="match_parent" android:layout_height="match_parent"> <TextView android:text="Name" android:layout_alignParentLeft="true" android:id="@+id/textViewName" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <ImageView android:background="@drawable/success" android:layout_alignParentRight="true" android:id="@+id/imageViewStatus" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </RelativeLayout>

As you can see we have a TextView to display the name and an ImageView to display the status.

Download the icons from the below link, we have two images to display queued or synced.

Icons Download (Android Sync SQLite Database with Server) (0 downloads)

(adsbygoogle = window.adsbygoogle || []).push();

You have to copy the downloaded icons inside drawable folder.

Building ListView

Model Class

Now create a class Name.java and write the following code.

package net.simplifiedcoding.androidmysqlsync; /** * Created by Belal on 1/27/2017. */ public class Name private String name; private int status; public Name(String name, int status) this.name = name; this.status = status; public String getName() return name; public int getStatus() return status;

Now we will create an Adapter for our ListView.

Adapter

Create a class NameAdapter.java and write the following code.

package net.simplifiedcoding.androidmysqlsync; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ImageView; import android.widget.TextView; import java.util.List; /** * Created by Belal on 1/27/2017. */ public class NameAdapter extends ArrayAdapter<Name> //storing all the names in the list private List<Name> names; //context object private Context context; //constructor public NameAdapter(Context context, int resource, List<Name> names) super(context, resource, names); this.context = context; this.names = names; @Override public View getView(int position, View convertView, ViewGroup parent) //getting the layoutinflater LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); //getting listview itmes View listViewItem = inflater.inflate(R.layout.names, null, true); TextView textViewName = (TextView) listViewItem.findViewById(R.id.textViewName); ImageView imageViewStatus = (ImageView) listViewItem.findViewById(R.id.imageViewStatus); //getting the current name Name name = names.get(position); //setting the name to textview textViewName.setText(name.getName()); //if the synced status is 0 displaying //queued icon //else displaying synced icon if (name.getStatus() == 0) imageViewStatus.setBackgroundResource(R.drawable.stopwatch); else imageViewStatus.setBackgroundResource(R.drawable.success); return listViewItem;

Coding MainActivity

Now lets come inside MainActivity.java and write the following code.

package net.simplifiedcoding.androidmysqlsync; import android.Manifest; import android.app.ProgressDialog; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.pm.PackageManager; import android.database.Cursor; import android.net.ConnectivityManager; import android.support.v4.content.ContextCompat; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.ListView; import android.widget.Toast; import com.android.volley.AuthFailureError; import com.android.volley.Request; import com.android.volley.RequestQueue; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.toolbox.StringRequest; import com.android.volley.toolbox.Volley; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class MainActivity extends AppCompatActivity implements View.OnClickListener /* * this is the url to our webservice * make sure you are using the ip instead of localhost * it will not work if you are using localhost * */ public static final String URL_SAVE_NAME = "http://192.168.1.107/SqliteSync/saveName.php"; //database helper object private DatabaseHelper db; //View objects private Button buttonSave; private EditText editTextName; private ListView listViewNames; //List to store all the names private List<Name> names; //1 means data is synced and 0 means data is not synced public static final int NAME_SYNCED_WITH_SERVER = 1; public static final int NAME_NOT_SYNCED_WITH_SERVER = 0; //a broadcast to know weather the data is synced or not public static final String DATA_SAVED_BROADCAST = "net.simplifiedcoding.datasaved"; //Broadcast receiver to know the sync status private BroadcastReceiver broadcastReceiver; //adapterobject for list view private NameAdapter nameAdapter; @Override protected void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //initializing views and objects db = new DatabaseHelper(this); names = new ArrayList<>(); buttonSave = (Button) findViewById(R.id.buttonSave); editTextName = (EditText) findViewById(R.id.editTextName); listViewNames = (ListView) findViewById(R.id.listViewNames); //adding click listener to button buttonSave.setOnClickListener(this); //calling the method to load all the stored names loadNames(); //the broadcast receiver to update sync status broadcastReceiver = new BroadcastReceiver() @Override public void onReceive(Context context, Intent intent) //loading the names again loadNames(); ; //registering the broadcast receiver to update sync status registerReceiver(broadcastReceiver, new IntentFilter(DATA_SAVED_BROADCAST)); /* * this method will * load the names from the database * with updated sync status * */ private void loadNames() names.clear(); Cursor cursor = db.getNames(); if (cursor.moveToFirst()) do Name name = new Name( cursor.getString(cursor.getColumnIndex(DatabaseHelper.COLUMN_NAME)), cursor.getInt(cursor.getColumnIndex(DatabaseHelper.COLUMN_STATUS)) ); names.add(name); while (cursor.moveToNext()); nameAdapter = new NameAdapter(this, R.layout.names, names); listViewNames.setAdapter(nameAdapter); /* * this method will simply refresh the list * */ private void refreshList() nameAdapter.notifyDataSetChanged(); /* * this method is saving the name to ther server * */ private void saveNameToServer() final ProgressDialog progressDialog = new ProgressDialog(this); progressDialog.setMessage("Saving Name..."); progressDialog.show(); final String name = editTextName.getText().toString().trim(); StringRequest stringRequest = new StringRequest(Request.Method.POST, URL_SAVE_NAME, new Response.Listener<String>() @Override public void onResponse(String response) progressDialog.dismiss(); try JSONObject obj = new JSONObject(response); if (!obj.getBoolean("error")) //if there is a success //storing the name to sqlite with status synced saveNameToLocalStorage(name, NAME_SYNCED_WITH_SERVER); else //if there is some error //saving the name to sqlite with status unsynced saveNameToLocalStorage(name, NAME_NOT_SYNCED_WITH_SERVER); catch (JSONException e) e.printStackTrace(); , new Response.ErrorListener() @Override public void onErrorResponse(VolleyError error) progressDialog.dismiss(); //on error storing the name to sqlite with status unsynced saveNameToLocalStorage(name, NAME_NOT_SYNCED_WITH_SERVER); ) @Override protected Map<String, String> getParams() throws AuthFailureError Map<String, String> params = new HashMap<>(); params.put("name", name); return params; ; VolleySingleton.getInstance(this).addToRequestQueue(stringRequest); //saving the name to local storage private void saveNameToLocalStorage(String name, int status) editTextName.setText(""); db.addName(name, status); Name n = new Name(name, status); names.add(n); refreshList(); @Override public void onClick(View view) saveNameToServer();

Now if you will run the application it will save the name to MySQL and SQLite with the sync or unsynced status.

But to send the unsynced names to the server automatically we have to detect the Network Status of the phone. For this we need one more broadcast receiver.

Detecting Network State

Creating Broadcast Receiver

Create a class named NetworkStateChecker.java and write the following code.

package net.simplifiedcoding.androidmysqlsync; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.net.ConnectivityManager; import android.net.NetworkInfo; import com.android.volley.AuthFailureError; import com.android.volley.Request; import com.android.volley.Response; import com.android.volley.VolleyError; import com.android.volley.toolbox.StringRequest; import org.json.JSONException; import org.json.JSONObject; import java.util.HashMap; import java.util.Map; /** * Created by Belal on 1/27/2017. */ public class NetworkStateChecker extends BroadcastReceiver //context and database helper object private Context context; private DatabaseHelper db; @Override public void onReceive(Context context, Intent intent) this.context = context; db = new DatabaseHelper(context); ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo activeNetwork = cm.getActiveNetworkInfo(); //if there is a network if (activeNetwork != null) activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) //getting all the unsynced names Cursor cursor = db.getUnsyncedNames(); if (cursor.moveToFirst()) do //calling the method to save the unsynced name to MySQL saveName( cursor.getInt(cursor.getColumnIndex(DatabaseHelper.COLUMN_ID)), cursor.getString(cursor.getColumnIndex(DatabaseHelper.COLUMN_NAME)) ); while (cursor.moveToNext()); /* * method taking two arguments * name that is to be saved and id of the name from SQLite * if the name is successfully sent * we will update the status as synced in SQLite * */ private void saveName(final int id, final String name) StringRequest stringRequest = new StringRequest(Request.Method.POST, MainActivity.URL_SAVE_NAME, new Response.Listener<String>() @Override public void onResponse(String response) try JSONObject obj = new JSONObject(response); if (!obj.getBoolean("error")) //updating the status in sqlite db.updateNameStatus(id, MainActivity.NAME_SYNCED_WITH_SERVER); //sending the broadcast to refresh the list context.sendBroadcast(new Intent(MainActivity.DATA_SAVED_BROADCAST)); catch (JSONException e) e.printStackTrace(); , new Response.ErrorListener() @Override public void onErrorResponse(VolleyError error) ) @Override protected Map<String, String> getParams() throws AuthFailureError Map<String, String> params = new HashMap<>(); params.put("name", name); return params; ; VolleySingleton.getInstance(context).addToRequestQueue(stringRequest);

Adding Receiver in Manifest

Add the following code in your AndroidManifest.xml file inside application tag.

Registering Receiver

You also need to register the receiver. So add the following line inside onCreate() method of your MainActivity.java file.

registerReceiver(new NetworkStateChecker(), new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));

Now you can run your application.

Testing the Application

Run your application. And try saving the name when internet is available also turn off the internet and again try saving your name.

Android Sync SQLite Database with Server

When the internet will be available again the data will be automatically sent to MySQL.

Download Source Code

You can get the source code from the following GitHub repository.

Android Sync SQlite Database with Server Source Code

So thats it for this android sync sqlite database with server tutorial friends. Feel free to leave your comments if you are having any troubles making the project. Also follow the steps carefully as the post is very long. And if you found this helpful please favor us by sharing this post in your social network. Thank You 🙂

#android sync sqlite database with server #sqlite database synchronization #sqlite replication

0 notes

faizrashis1995 · 5 years ago

Text

Top 10 Most Common Mistakes That Android Developers Make: A Programming Tutorial

Common Mistake #1: Developing for iOS To my great pleasure, this Android mistake is far less common nowadays (partially because clients are beginning to realize that the days when Apple was setting all the design standards are long gone). But still, every now and then, we see an app that is an iOS clone.

Don’t get me wrong, I’m not an Android programming evangelist! I respect every platform that moves the mobile world a step forward. But, it’s 2014 and users have been using Android for quite a while now, and they’ve grown accustomed to the platform. Pushing iOS design standards to them is a terrible strategy!

Unless there is a super good reason for breaking the guidelines, don’t do it. (Google does this all the time, but never by copy-pasting.)

Here are some of the most common examples of this Android mistake:

You should not be making static tabs, and they don’t belong on the bottom (I’m pointing at you Instagram). System notification icons should not have color. App icons should not be placed inside a rounded rectangle (unless that’s your actual logo ex. facebook). Splash screens are redundant beyond the initial setup/introduction. Do not use them in other scenarios. Lists should not have carets. These are just a few of the many other small things that can ruin the user experience.

Common Mistake #2: Developing for Your Android Device Unless you are building a kiosk/promo app for a single tablet, chances are your Android app won’t look good on every device. Here are a few Android programming tips to remember:

Density-independent pixels (dp) are different than normal pixels (px). Resources are included multiple times to account for different densities and orientations. 9-patch drawables are stretched to fit the screen. There are literally thousands of possible scenarios, but after a while you develop a sense for covering them all with a handful of cases.

You don’t own thousands of devices? Not a problem. The Android Emulator is super good in replicating physical devices. Even better, try out Genymotion, it’s lightning fast and comes with a lot of different popular preset devices.

Also, have you tried rotating your device? All hell can break loose…

Common Mistake #3: Not Using Intents Intents are one of Android’s key components. It’s a way of passing data between different parts of the app or, even better, different apps on the system.

Let’s say you have a gallery app that can share a download link to some images via SMS. Which of the two options seems more logical?

Option 1:

Request the SEND_SMS permission.

<uses-permission android:name="android.permission.SEND_SMS" /> Write your own code for sending SMS using the SmsManager. Explain to your users why your gallery app needs access to services that can cost money, and why they have to grant this permission to use your app. Option 2:

Start an SMS Intent and let an app designed for SMS do the work

Intent sendIntent = new Intent(Intent.ACTION_VIEW); sendIntent.setData(Uri.parse("sms:" + telephoneNumber)); sendIntent.putExtra("sms_body", x); startActivity(sendIntent); In case that you have any doubts, best solution is option 2!

This approach can be applied to almost anything. Sharing content, taking pictures, recording video, picking contacts, adding events, opening links with native apps, etc.

Unless there is a good reason to make a custom implementation (ex., a camera that applies filters), always use Intents for these scenarios. It will save you a lot of programming time, and strip the AndroidManifest.xml of unnecessary permissions.

Common Mistake #4: Not Using Fragments A while ago in Honeycomb, Android introduced the concept of fragments. Think of them as separate building blocks with their own (rather complex) life cycles that exist inside an Activity. They help a lot with optimizing for various screens, they are easily managed by their parent activity, can be reused, combined and positioned at will.

Launching a separate activity for each app screen is terribly inefficient, since the system will try to keep them in memory as long as it can. Killing one won’t free the resources used by the others.

This Android programming tutorial recommends the proper use of fragments to make your app more efficient.

Unless you want to dig deep into the Android core and read this article, advocating against fragment usage, you should use fragments whenever possible. It basically says that fragments and cursor loaders have good intended purpose, but poor implementation.

Common Mistake #5: Blocking the Main Thread The main thread has a single purpose: keeping the user interface responsive.

Although the science behind measuring the frame rate our eyes/brain can perceive is complex and influenced by a lot of factors, a general rule is that anything below 24 fps with delay greater than 100 ms won’t be perceived as smooth.

This means that the user’s actions will have a delayed feedback, and the Android app you have programmed will stop responding. Stripping the user of his control over the app leads to frustration, frustrated users tend to give very negative feedback.

Even worse, if the main thread is blocked for a while (5 seconds for Activities, 10 for Broadcast Receivers), ANR will happen.

As you learn Android programming, you will come to know and fear this message. Follow these Android programming tips to minimize this occurrence.

This was so common in Android 2.x, that on newer versions the system won’t let you make network calls in the main thread.

To avoid blocking the main thread, always use worker/background threads for: 1. network calls 2. bitmap loading 3. image processing 4. database querying 5. SD reading / writing

Common Mistake #6: Reinventing the Wheel “OK, I won’t use the main thread. I’ll write my own code that communicates with my server in a background thread.”

No! Please don’t do that! Network calls, image loading, database access, JSON parsing, and social login are the most common things you do in your app. Not just yours, every app out there. There is a better way. Remember how Android has matured and grown as a platform? Here’s a quick list of examples:

Use gradle as a build system. Use Retrofit / Volley for network calls. Use Picasso for image loading. Use Gson / Jackson for JSON parsing. Use common implementations for social login. If you need something implemented, chances are it’s already written, tested and used widely. Do some basic research and read some Android programming tutorials before writing your own code!

Common Mistake #7: Not Assuming Success Great. We have learned that there is a better way for handling long running tasks, and we are using well documented libraries for that purpose. But the user will still have to wait. It’s inevitable. Packages are not sent, processed and received instantly. There is a round trip delay, there are network failures, packages get lost, and dreams get destroyed.

But all this is measurable. Successful network calls are far more likely than unsuccessful ones. So why wait for server response before handling the successful request? It’s infinitely better to assume success and handle failure. So, when a user likes a post the like count is immediately increased, and in unlikely event that the call failed, the user is notified.

In this modern world immediate feedback is expected. People don’t like to wait. Kids don’t want to sit in a classroom obtaining knowledge that has uncertain future payoff. Apps must accommodate to the user’s psychology.

Common Mistake #8: Not Understanding Bitmaps Users love content! Especially when the content is well formatted and looks nice. Images, for instance, are extremely nice content, mainly due to their property of conveying a thousand words per image. They also consume a lot of memory. A lot of memory!

Before an image is displayed on the screen, it has to be loaded into the memory. Since bitmaps are the most common way to do this, we’re going to provide an Android programming guide for the whole process:

Let’s say you want to display an image on your screen that you just took with your camera. The total memory needed for this is calculated with the following formula: memory_needed_in_bytes = 4 * image_width * image_height;

Why 4? Well, the most common / recommended bitmap configuration is ARGB_8888. That means that for each pixel we draw, we need to keep 8 bits (1 byte) for the alpha, the red, the greed and the blue channel in memory, in order to properly display it. There are alternatives, like the RGB_565 configuration that requires half the memory than ARGB_8888, but loses the transparency and the color precision (while maybe adding a green tint).

Let’s assume you have a brand new device with full HD screen and 12 MP camera. The picture you just took is 4000x3000 pixels large and the total memory needed to display it is: 4 bytes * 4000 * 3000 = 48 MB

48 megabytes of your RAM just for a single image!? That’s a lot!

Now let’s take the screen resolution into consideration. You are trying to show a 4000x3000 image on a screen that has 1920x1080 pixels, in worst case scenario (displaying the image full screen) you shouldn’t allocate more than 4 * 1920 * 1080 = 8.3 MB of memory.

Always follow the Android programming tips for displaying bitmaps efficiently:

Measure the view you’re showing your images in. Scale / crop the large image accordingly. Show only what can be displayed. Common Mistake #9: Using Deep View Hierarchy Layouts have an XML presentation in Android. In order to draw content, the XML needs to be parsed, the screen needs to be measured, and all the elements need to be placed accordingly. It’s a resource- and time-consuming process that needs to be optimized.

This is how the ListView (and more recently the RecyclerView) works.

If a layout has been inflated once, the system reuses it. But still, inflating the layout must happen at some point.

Let’s say you want to make a 3x3 grid with images. One way of doing this is a vertical LinearLayout containing 3 LinearLayouts with equal weight, each of them containing 3 ImageViews with equal weight.

Some Android programming beginners don’t always make the best use of LinearLayouts.

What do we get with this approach? A warning that “nested weights are bad for performance”.

There is a saying in the Android programming world, that I just made up: “With little effort all hierarchy can be flattened”.

In this case RelativeLayout or GridLayout will efficiently replace the nested

Common Mistake #10: Not Setting the minSdkVersion to 14 Well, this is not a mistake, but it is bad practice.

Android 2.x was a huge milestone in developing this platform, but some things should be left behind. Supporting older devices adds more complexity for code maintenance and limits the development process.

The numbers are clear, the users have moved on, the developers shouldn’t stay behind.

I’m aware that this doesn’t apply for some big markets with old devices (ex. India), and setting the minSdkVersion to 14, on the Facebook App, means leaving couple of million users without their favorite social network. But, if you are starting fresh and trying to create a beautiful experience for your users, do consider eliminating the past. Users that don’t have the resources, or feel the need to upgrade their device/OS, won’t have the incentive to try out a superior version of your Android app and ultimately spend money on it.[Source]-https://www.toptal.com/android/top-10-most-common-android-development-mistakes

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