adb shell service call activity 42 s16 com.android.systemui

adb shell am startservice -n com.android.systemui/.SystemUIService

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;
}