harmony surfaceProvider绘制不显示问题

鸿蒙自定义SurfaceProvider

@Override
protected void onRender(Canvas canvas, long millisPassed) {
    float offset = millisPassed / offsetSpeed;
    HiLog.info(label, "WLV_onRender "+(canvas==null)+" paint "+(paint==null));
    Paint paint1 = new Paint();
    paint1.setColor(Color.WHITE);
    canvas.drawCircle(200,200,130,paint1);

    HiLog.info(label, "WLV_onRender02");

}

有输出日志,但是看不到绘制的东西, 哪位大神知道是啥原因吗