切割drawable

public Drawable getWallpaper1(Drawable wallpaperDrawable, int cutHeight){
　　final float scale = getResources().getDisplayMetrics().density;
　　int temp_height = wallpaperDrawable.getIntrinsicHeight();
　　int temp_width = wallpaperDrawable.getIntrinsicWidth();
　　float height = Math.max(temp_height, temp_width)/scale;
　　float width = Math.min(temp_height, temp_width)/scale;
　　Bitmap bitmapWithReflection = Bitmap.createBitmap((int)width, (int)(height-cutHeight), Config.ARGB_8888);
　　Canvas canvas = new Canvas(bitmapWithReflection);
　　Paint paint = new Paint();
　　wallpaperDrawable.setBounds(0, -cutHeight, (int)width, (int)(height-cutHeight));
　　wallpaperDrawable.draw(canvas);
　　canvas.drawBitmap(bitmapWithReflection, 0, 0, paint);

　　return new BitmapDrawable(bitmapWithReflection);
}