setwallpaper.java

Bitmap mBitmap = BitmapFactory.decodeResource(getResources(), R.id.full_image_view);
WallpaperManager myWallpaperManager = WallpaperManager
        .getInstance(getApplicationContext());

try {
    myWallpaperManager.setBitmap(mBitmap);
    Toast.makeText(SetWallPaper.this, "Wallpaper set",
            Toast.LENGTH_SHORT).show();
} catch (IOException e) {
    Toast.makeText(SetWallPaper.this,
            "Error setting wallpaper", Toast.LENGTH_SHORT)
            .show();
}