Android programming
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The document discusses Android programming and provides details about Android operating system components, the package explorer, and Android platform components. It describes that Android is based on the Linux kernel and led by Google. It includes background processing, a rich user interface, 2D and 3D graphics, and file system/SQLite access. Android applications consist of visual and non-visual components that can reuse other app components.
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Android programming
- 1. Android Programming Presented By k.suryakumar
- 2. The Android operating system • Android is an operating system based on the Linux kernel. The project responsible for developing the Android system is called theAndroid Open Source Project (AOSP) and is primarily lead by Google. • The Android system supports background processing, provides a rich user interface library, supports 2-D and 3-D graphics using the OpenGL-ES (short OpenGL) standard and grants access to the file system as well as an embedded SQLite database. • An Android application typically consists of different visual and non visual components and can reuse components of other applications.
- 3. Package Explorer 1) src This contains the .java source files for your project. By default, it includes an MainActivity.javasource file having an activity class that runs when your app is launched using the app icon. 2) gen This contains the .R file, a compiler-generated file that references all the resources found in your project. You should not modify this file. 3) bin This folder contains the Android package files .apk built by the ADT during the build process and everything else needed to run an Android application.
- 4. Package Explorer 4) res/drawable-hdpi This is a directory for drawable objects that are designed for high-density screens. 5) res/layout This is a directory for files that define your app's user interface. 6) res/values This is a directory for other various XML files that contain a collection of resources, such as strings and colors definitions. 7) AndroidManifest.xml This is the manifest file which describes the fundamental characteristics of the app and defines each of its components.
- 5. Android platform components The Android system is a full software stack, which is typically divided into the four areas as depicted in the following graphic. All the Components are build upon Linux Kernal.
- 6. Android platform components • Applications – The Android Open Source Project contains several default application, like the Browser, Camera, Gallery, Music, Phone and more. • Application framework - An API which allows high-level interactions with the Android system from Android applications. • Libraries and runtime - The libraries for many common functions (e.g.: graphic rendering, data storage, web browsing, etc.) of the Application Framework and the Dalvik runtime, as well as the core Java libraries for running Android applications.
- 7. Android platform components • Linux kernel - Communication layer for the underlying hardware. The Linux kernel, the libraries and the runtime are encapsulated by the application framework. The Android application developer typically works with the two layers on top to create new Android applications.
- 8. Task In Android the reuse of other application components is a concept known as task. An application can access other Android components to achieve a task.
- 9. Thanks A Lot