Failed to run RenderNode

[Juude Song]

I tried to use the hide api RenderNode in android , but it does not take effect.

am I doing it wrong? or It is not yet supported in Android? 

        @Override
        protected void onDraw(Canvas canvas) {
                Log.d(TAG , "onDraw canvas : @" + System.identityHashCode(canvas) + "name " + this.getTag() + "   type :" + canvas.getClass().getName());

               
                super.onDraw(canvas);
                this.getHardwareRenderer();

                //create new RenderNode
                RenderNode node = RenderNode.create("juude", this);
                HardwareCanvas hCanvas = node.start(200, 500);
                mPaint.setStyle(Style.FILL);
                mPaint.setColor(Color.RED);
                hCanvas.drawRect(0, 0, 100, 200,mPaint);
                hCanvas.drawColor(Color.RED);
                node.end(hCanvas);

                //draw on current canvas
                HardwareCanvas hardwareCanvas = (HardwareCanvas)canvas;
                Log.d(TAG, "beforedrawRenderNode valid : " + node.isValid());
                hardwareCanvas.insertReorderBarrier();
                hardwareCanvas.drawRenderNode(node);
                hardwareCanvas.insertInorderBarrier();
                Log.d(TAG, "afterdrawRenderNode  validx" + node.isValid());
        }