public static Bitmap apply(Context context, Bitmap sentBitmap, int radius) {
        final 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);
        script.setInput(input);
        script.forEach
 
(output);
        output.copyTo(bitmap);

        sentBitmap.recycle();
        rs.destroy();
        input.destroy();
        output.destroy();
        script.destroy();

        return bitmap;
    }

radius: 模糊度
sentBitmap: 源bitmap