How do I refresh the wallpaper image without reboot after restarting the Android SystemUIService?

Question

I\'m creating an enterprise app for my company that will only run on a company provided 7\" tablet which is rooted and running Android 4.2.2. A requirement is that when the

Answer 1

After further investigation i discovered that when i run these commands, the wallpaper only disappears when it was an image and not a live wallpaper or video wallpaper.

I realise that this is quite specific to an uncommon scenario, but I thought I would share my solution in the event that it may help somebody else in the future. I hoped that there was a command that i could run that would resolve this but couldn't find anything so I decided to refresh the wallpaper programmatically. WallpaperManager doesn't have a refresh method at this stage so I just get the existing wallpaper image and then set the wallpaper to that image. A bit of a hack but in my opinion it is better than leaving the user with a black wallpaper.

private void refreshWallpaper() {
    try {
        WallpaperManager wallpaperManager = 
            WallpaperManager.getInstance(context);
        WallpaperInfo wallpaperInfo = wallpaperManager.getWallpaperInfo();

        // wallpaperInfo is null if a static wallpaper is selected and
        // is not null for live wallpaper & video wallpaper.
        if (wallpaperInfo == null) {
            // get the existing wallpaper drawable
            Drawable wallpaper = wallpaperManager.peekDrawable();

            // convert it to a bitmap
            Bitmap wallpaperBitmap = drawableToBitmap(wallpaper);

            // reset the bitmap to the current wallpaper
            wallpaperManager.setBitmap(wallpaperBitmap);    
        }
    } catch (Exception e) {
        // TODO: Handle exception as needed
        e.printStackTrace();
    }
}

private static Bitmap drawableToBitmap(Drawable drawable) {
    if (drawable instanceof BitmapDrawable) { 
        return ((BitmapDrawable) drawable).getBitmap(); 
    }

    Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(),
        drawable.getIntrinsicHeight(), Config.ARGB_8888);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
    drawable.draw(canvas);

    return bitmap;
}