Introduction. Android is an Operating System for mobile devices developed by Google, which is built upon Linux kernel. Android competes with Apple's iOS (for iPhone. If you have noticed in recent android applications, the EditText widget looks very pleasing. Hint text gives a floating animation when the EditText is focused. In this article we will create an application which will add action items and overflow menu items to action bar. This application is developed in Eclipse 3.
How to receive push notifications using MQTT in an Android mobile application. I’ve written before about MQTT as a technology for doing push. Tutorial: Building an Android Application in 6 Steps. A few months ago, when I started working with Android, I built an Employee Directory application as an. ActionBarActivity assumes you are using an ActionBar, while Theme.NoTitleBar themes remove the ActionBar (as that is part of the title bar on newer devices and.
How to Install Android SDK and Get Started. Introduction. Android is an Operating System for mobile devices developed by Google, which is built upon Linux kernel.
Android competes with Apple's i. OS (for i. Phone/i. Pad), RIM's Blackberry, Microsoft's Windows Phone, Symbian OS, and many other proprietary mobile OSes. The latest Android 7 (Nougat) supports Phone/Tablet, TV, Wear (watch and glass), Automobile and Internet of things. Android Platform. Android is based on Linux with a set of native core C/C++ libraries.
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- Later this year, Apple will publicly release iOS 11, which includes a one-handed mode for the default keyboard. That’s a great idea, which is why so many third.
Android applications are written in Java. However, they run on Android's own Java Virtual Machine, called Dalvik Virtual Machine (DVM) (instead of JDK's JVM) which is optimized to operate on the small and mobile devices. The mother site for Android is https: //www. For programmers and developers, visit https: //developer.
SDK, Android Training, API Guides and API documentation. Installing . It takes times - from 3.
IT knowledge) and your PC. You probably need a fairly decent PC to run the Android emulator and 5- 1. GB of free disk space!!!
We need to install both the . Ensure that your JDK is at or above 1. You can check your JDK version with command .
Do NOT stare at your screen or at the ceiling. Browse through the . There are three main menus: . For beginners, browse through the . Otherwise, set the JAVA.
Check the detail steps HERE. Check the system requirements for Android Studio/SDK @ https: //developer. Requirements. Goto .
Follow the on- screen instruction and accept the defaults to complete the installation. You need about 5. GB of free disk space!
Take note (and take photo) on the installation locations of . E. g., android- studio- ide- 1. MB). Launch the downloaded . Drag and drop Android Studio into the . Then run again. The Android SDK is installed in . You may need to add a few more to run the Hello- world.
Adding too many SDK packages, especially the so- called system images for emulating different device (e. LONG time, especially if everyone is downloading and jamming up the network. The system images also take up a lot of disk space - more than 1. GB per API level!!! For our toy project, we only need a small set of SDK packages.! In this latest Android Studio, all the necessary components have been installed.
Launch Android Studio . If any of the . Otherwise, check . Android SDK provides . Our toy project does not need to be simulated on ALL hardware but just anyone of the hardware! The SDK will be installed under .
I shall assume that you have basic knowledge of Java and XML. Take note that Android emulator is slow - VERY VERY VERY SLOW!!! Be Patient!!! Hello- World. Step 0: Read. Goto . It could take a while to set up your first app. The app appears after . By default, a hello- world app is created.
Step 2: Setup Emulator (aka Android Virtual Device (AVD))To run your Android app under the emulator, you need to first create an Android Virtual Devices (AVD). An AVD models a specific device (e.
Pone or Taimi). You can create AVDs to emulate different android devices (e. In Android studio, select .
Follow the instruction to install HAXM. You MAY BE asked to enable VT- x in BIOS. Reboot your computer, hit a hot- key to enter BIOS (ESC for my HP). Enable VT- x under . It may take a few MINUTES to fire up the app on the emulator. You first see a black screen . Goto next step. DO NOT CLOSE THE EMULATOR, as it really takes a long time to start.
You could always re- run the app (or run a new app) on the same emulator. Try re- run the app by selecting ! The installer may take a while to launch . You need to unhide via . You can unhide via .
Shutdown and re- boot your PC to enter the BIOS setup. This is machine dependent. Disable your antivirus for this session and rerun. See http: //stackoverflow.
If you have problem creating AVD via . Make sure that you have the .
You can find the . If you device is not certified there, good luck! It took me many hours to find a compatible driver for my cheap un- brand Tablet. Enable . Return to the previous screen to find . This allows Android SDK to transfer data between your computer and your device. This allows applications from unknown sources to be installed on the device. Ref: See https: //www.
You shall see the message . We shall continue from the . Expand the . Expand the . REPLACE the on. Create() method as follows and add the import statement. Do not touch the rest of the codes. You shall see the message .
The Main. Activity extends the android. Activity class, and overrides the on. Create() method. The on. Create() is a call- back method, which is called back by the Android system when the activity is launched. A View is a UI component (or widget, or control).
We construct a Text. View (which is a subclass View for showing a text message), and set its text. We then set the content- view of the Main. Activity screen to this Text.
View. Android Application Descriptor File - . It describes the Android app. For example, our . It contains one ore more < activity> elements. This application has one activity.
The < activity> element declares its program name (. It may contain < intent- filter>.
The < intent- filter> declares that this activity is the entry point (android. MAIN) of the application. This activity is to be added to the application launcher (android. LAUNCHER). Hello- World using . It is more flexible and therefore recommended to layout your UI components via a descriptive XML layout file. In this way, you don't need to hardcode the views, and you can easily modify the look and feel of the application by editing the XML markups. The Java codes can therefore focus on the business logic.
Let's rewrite our hello- world to use XML layout. Step 1: Create a New Android Application. CLOSE the previous project, via . Android Studio provides two views for this XML file: . Select the . The Text. View component has width and height big enough to hold its content (.
Open strings. xml, and ADD the line in red. You shall see the new string.