use script intransic blur android

@SuppressLint("NewApi")
private Bitmap blurRenderScript(Bitmap smallBitmap) {

    Bitmap output = Bitmap.createBitmap(smallBitmap.getWidth(), smallBitmap.getHeight(), smallBitmap.getConfig());

    RenderScript rs = RenderScript.create(getContext());
    ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
    Allocation inAlloc = Allocation.createFromBitmap(rs, smallBitmap, Allocation.MipmapControl.MIPMAP_NONE, Allocation.USAGE_GRAPHICS_TEXTURE);
    Allocation outAlloc = Allocation.createFromBitmap(rs, output);
    script.setRadius(BLUR_RADIUS);
    script.setInput(inAlloc);
    script.forEach(outAlloc);
    outAlloc.copyTo(output);

    rs.destroy();

    MutableBitmap.delete(smallBitmap);

    return output;
}