CardViewActivity.java 文件源码

public Bitmap captureView(View view) {
  if (mBlurredBitmap != null) {
    return mBlurredBitmap;
  }
  //Find the view we are after
  //Create a Bitmap with the same dimensions
  mBlurredBitmap = Bitmap.createBitmap(view.getMeasuredWidth(),
      view.getMeasuredHeight(),
      Bitmap.Config.ARGB_4444); //reduce quality and remove opacity
  //Draw the view inside the Bitmap
  Canvas canvas = new Canvas(mBlurredBitmap);
  view.draw(canvas);

  //blur it
  ImageHelper.blurBitmapWithRenderscript(rs, mBlurredBitmap);

  //Make it frosty
  Paint paint = new Paint();
  paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
  ColorFilter filter = new LightingColorFilter(0xFFFFFFFF, 0x00222222); // lighten
  //ColorFilter filter = new LightingColorFilter(0xFF7F7F7F, 0x00000000);    // darken
  paint.setColorFilter(filter);
  canvas.drawBitmap(mBlurredBitmap, 0, 0, paint);

  return mBlurredBitmap;
}