How to replace the default wallpapers in android

We're building a custom system which is running on android.

In my app I need to replace the default wallpapers images and load our own custom images.How to do that?

Do I need to replace the images from the file system and recompile the android? If I need to recompile the source then is there any way to do that with out compiling the android source?

Thanks开发者_开发知识库

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You can set wallpaper using WallpaperManager. To change example wallpapers in Home application you must change it's resources and recompile it.