android 磨砂玻璃效果

@SuppressLint("InlinedApi")
public static Bitmap fastblur(Context context, Bitmap sentBitmap, int radius)
{
Bitmap bitmap = sentBitmap.copy(sentBitmap.getConfig(), true);
final RenderScript rs = RenderScript.create(context);
final Allocation input = Allocation.createFromBitmap(rs,sentBitmap, Allocation.MipmapControl.MIPMAP_NONE,Allocation.USAGE_SCRIPT);
final Allocation output = Allocation.createTyped(rs,input.getType());
final ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs,Element.U8_4(rs));
script.setRadius(radius);/* e.g. 3.f */
script.setInput(input);
script.forEach(output);
output.copyTo(bitmap);
return bitmap;
}

mLaybg.setBackground(new BitmapDrawable(fastblur(mLauncher,BitmapFactory.decodeResource(getResources(),draw_id),12)));