Session 2 beccse

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Android Workshop PPt's

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Session 2 beccse

  1. 1. Getting Started withAndroid application development Dept. of Computer Science and Engineering
  2. 2. What is required for Android application development?• Latest version of JDK• Android SDK (Windows/Linux)• IDE (Eclipse/Anything of your choice)• Android Eclipse Add-on (ADT) Dept. of Computer Science and Engineering
  3. 3. JDK or Java JDK• Java SE development kit• Its an essential component, because every app are written usingjava language• so, you need to have JDK to compile and generate the java files atthe run time• download latest version of JDK• why java only..??? Dept. of computer Science and Engineering
  4. 4. Eclipse• It is the preferred IDE (integrated development environment) by the Android team.• Its multi language software development environmentfeaturing an extensible plug-in system.• Download Eclipse of any version on your machine.• You can download it here www.eclipse.org• Six editions are available, for all types of OS. Dept. of Computer Science and Engineering
  5. 5. Android SDK• Android SDK (software development kit) contains a debugger,libraries, an emulator, documentation, sample code, and tutorials.• Android SDK initially contains only the basic tools, It does notcontain all android platforms and platforms tools.• Therefore, you must install the platform tools and atleast oneversion of the Android platform.•Download Android SDK zip file from: http://developer.android.com/sdk Dept. of Computer Science and Engineering
  6. 6. Android emulator• Android SDK Includes a mobile device emulator.• Its virtual mobile device that runs on your computer, Theemulator lets you develop & test android apps without using aphysical device.• So, you have to create AVDs (Android Virtual device), these areemulator instances.• you can create as many AVDs you want in order to test yourapp with different configurations. Dept. of Information Science and Engineering
  7. 7. ADT (android development tools)• Its an extension for eclipse IDE.• Its a custom plug-in offered by android.• Designed to give powerful, integrated environment in whichyou can build android apps.• It extends the capabilities for eclipse to let you quickly set upAndroid projects. Dept. of Information Science and Engineering
  8. 8. Configuring Android SDK into Eclipse Dept. of Computer Science and Engineering
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  19. 19. DDMS• Android ships with a debugging tool called the Dalvik Debug Monitor Server (DDMS).• When DDMS starts, it connects to android debug bridge (this lets us communicate with an emulator instance or connected android device).• When a device is connected, a VM monitoring service is created between adb and DDMS, which notifies DDMS when a VM on the device is started or terminated.• Once a VM is running, DDMS retrieves the the VMs process ID (pid), via adb, and opens a connection to the VMs debugger, through the adb daemon (adbd) on the device.• DDMS can now talk to the VM using a custom wire protocol. Dept. of Computer Science and Engineering
  20. 20. Debugging Environment Dept. of Information Science and Engineering
  21. 21. Running DDMS• DDMS is integrated into Eclipse and is also shipped in the tools/ directory of the SDK. DDMS works with both the emulator and a connected device. If both are connected and running simultaneously, DDMS defaults to the emulator.• From eclipse: Click Window -> Open Perspective -> Other… -> DDMS Dept. of Information Science and Engineering
  22. 22. Logcat:• The Android logging system provides a mechanism for collecting and viewing system debug output.• Logs from various applications and portions of the system are collected in a series of circular buffers, which then can be viewed and filtered by the logcat command.• You can use logcat from an ADB shell to view the log messages. Dept. of Computer Science and Engineering
  23. 23. Contents of Project FolderProject name- Folder name 1.1 src 1.2 Android 2.1 1.3 gen 1.4 assets 1.5 res 1.6 AndroidManifest.xml1. 1 src-> package folder-> java file (activity name) contains the java file, which contains the application code. This is something that the user can do, translated into program. It corresponds to a screen.1.2 Android 2.1 -> this folder has all the default packages of the particular version of android,. i.e which contains all the class libraries needed forandroid application Dept. of Computer Science and Engineering
  24. 24. 1.3 gen -> contains r.java file, a compiler generated file that references allthe resources found in your project.1.4 assets -> this folder contains all the assets used by your application, suchas HTML, text files, databases, etc. Dept. of Information Science and Engineering
  25. 25. 1.5 Res- This folder contains the images which are being used and UI layout. 1. drawable: intended for drawing (HDPI, MDPI, LDPI) 2. Layout: main.xml This contains the GUI design for the android application. GUI can be done by either writing the xml code , or by drag and drop option. 3. Values: Strings.xml Contains String and theme elements Dept. of Computer Science and Engineering
  26. 26. 1.6 AndroidManifest.xml• This contains the following tabs Manifest, Application, Permission, Instrumentation and AndroidManifest.xml• This contains the package name, android version name, SDK version.• Any new activity is added, then it has to be declared over here.• This defines the components of the application and their relationships. It gives the permissions to components of the application as to what it can do with users.• The manifest file must declare all components in the application and should also declare all application requirements, such as the minimum version of Android required and any hardware configurations required Dept. of Computer Science and Engineering
  27. 27. Lunch Break Dept. of Computer Science and Engineering

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