Android Wallpaper Live Biography
Starting with Android 2.1. (API Level 7), developers can create live wallpapers - richer, animated, interactive backgrounds - on their home screens. A live wallpaper is very similar to a normal Android application: you can create menu with settings, use SGL and OpenGL for drawing, accelerometer, etc.
In this article, I want to demonstrate how to create live wallpaper from scratch.Step-by-step, we will create live wallpaper that would output TV test pattern on out home screen. Just like on real TV during night hours!
This article will highlight the following aspects of Live Wallpaper development:
Drawing on graphic primitives (circles, rectangles) using android.graphics.Canvas class Developing of applications for screens with different resolution and orientationCreation of settings dialog for live wallpaper
Reading of variables values for resource XML file Actual creation of live wallpaper for Android.
Live Wallpapers are animated, interactive backgrounds for the Android homescreen. A live wallpaper is similar to other Android applications and can use most of the same functionality.To create a live wallpaper, you need to create a XML file which describes your wallpaper.
This file should contain a description of the application and can contain a preview and a link to a preference activity which allow to customize the live wallpaper.You also maintain a service which must extend the abstract class "WallpaperService". "WallpaperService"is the base class for all live wallpapers in the system.
You must implement the method onCreateEngine() and return an object of type "Engine". This engine will handle the life cycle events, animations and drawings of the wallpaper. Here you find life cycle hooks, as for example onCreate(), onSurfaceCreated(), onVisibilityChanged(), onOffsetsChanged(), onTouchEvent() and onCommand() This service requires the permission "android.permission.BIND_WALLPAPER" and must be registered via an intent-filter to the action "android.service.wallpaper.WallpaperService".The service returns in its method onCreateEngine() an instance"android.service.wallpaper.WallpaperService.Engine". This class is responsible for handling the Live Wallpaper.You should also maintain in your AndroidManifest.xml that your application uses the feature "android.software.live_wallpaper" in AndroidManifest.xml. This will prevent that your wallpaper can be installed on devices which do not support live wallpapers.
Starting with Android 2.1. (API Level 7), developers can create live wallpapers - richer, animated, interactive backgrounds - on their home screens. A live wallpaper is very similar to a normal Android application: you can create menu with settings, use SGL and OpenGL for drawing, accelerometer, etc.
In this article, I want to demonstrate how to create live wallpaper from scratch.Step-by-step, we will create live wallpaper that would output TV test pattern on out home screen. Just like on real TV during night hours!
This article will highlight the following aspects of Live Wallpaper development:
Drawing on graphic primitives (circles, rectangles) using android.graphics.Canvas class Developing of applications for screens with different resolution and orientationCreation of settings dialog for live wallpaper
Reading of variables values for resource XML file Actual creation of live wallpaper for Android.
Live Wallpapers are animated, interactive backgrounds for the Android homescreen. A live wallpaper is similar to other Android applications and can use most of the same functionality.To create a live wallpaper, you need to create a XML file which describes your wallpaper.
This file should contain a description of the application and can contain a preview and a link to a preference activity which allow to customize the live wallpaper.You also maintain a service which must extend the abstract class "WallpaperService". "WallpaperService"is the base class for all live wallpapers in the system.
You must implement the method onCreateEngine() and return an object of type "Engine". This engine will handle the life cycle events, animations and drawings of the wallpaper. Here you find life cycle hooks, as for example onCreate(), onSurfaceCreated(), onVisibilityChanged(), onOffsetsChanged(), onTouchEvent() and onCommand() This service requires the permission "android.permission.BIND_WALLPAPER" and must be registered via an intent-filter to the action "android.service.wallpaper.WallpaperService".The service returns in its method onCreateEngine() an instance"android.service.wallpaper.WallpaperService.Engine". This class is responsible for handling the Live Wallpaper.You should also maintain in your AndroidManifest.xml that your application uses the feature "android.software.live_wallpaper" in AndroidManifest.xml. This will prevent that your wallpaper can be installed on devices which do not support live wallpapers.
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