BitmapBlur

    public Bitmap blur(Bitmap inBitmap, int radius) {
      
        if (radius >= 25) {
          radius = 25;
        }

        Bitmap bitmap = inBitmap.copy(inBitmap.getConfig(), true);

        final RenderScript rs = RenderScript.create(getApplicationContext());
        final Allocation input = Allocation.createFromBitmap( rs, bitmap, 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);
        script.setInput(input);
        script.forEach(output);
        output.copyTo(bitmap);

        return bitmap;
    }