how to Draw a hollow rectangle

[wangchengyan]

how to Draw a hollow rectangle

    this.canvas.setMode(CanvasView.Mode.DRAW);    // for drawing
    this.canvas.setBaseColor(Color.BLUE);
    this.canvas.setPaintStyle(Paint.Style.STROKE);
    this.canvas.setPaintStrokeWidth(20F);
    this.canvas.setPaintStrokeColor(Color.RED);
    this.canvas.setDrawer(CanvasView.Drawer.RECTANGLE);         // Draw Rectangle
    this.canvas.setLineCap(Paint.Cap.SQUARE);
    this.canvas.setBlur(5F);

I try this,but no used