绘制常规图形示例：
//初始化Paint
Paint paint = new Paint();
paint.setColor(Color.RED);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(10f);
Path path = new Path();
//以（400,200）为圆心，半径为100绘制圆
path.addCircle(400, 200, 100, Path.Direction.CW);
//绘制椭圆
RectF rectF = new RectF(100, 350, 500, 600);
//第一种方法绘制椭圆
path.addOval(rectF, Path.Direction.CW);
//第二种方法绘制椭圆
path.addOval(600, 350, 1000, 600, Path.Direction.CW);
//绘制矩形
RectF rect = new RectF(100, 650, 500, 900);
//第一种方法绘制矩形
path.addRect(rect, Path.Direction.CW);
//第一种方法绘制矩形
path.addRect(600, 650, 1000, 900, Path.Direction.CCW);
//绘制圆角矩形
RectF roundRect = new RectF(100, 950, 300, 1100);
//第一种方法绘制圆角矩形
path.addRoundRect(roundRect, 20, 20, Path.Direction.CW);
//第二种方法绘制圆角矩形
path.addRoundRect(350, 950, 550, 1100, 10, 50, Path.Direction.CCW);
//第三种方法绘制圆角矩形
//float[] radii中有8个值，依次为左上角，右上角，右下角，左下角的rx,ry
RectF roundRectT = new RectF(600, 950, 800, 1100);
path.addRoundRect(roundRectT, new float[]{50, 50, 50, 50, 50, 50, 0, 0}, Path.Direction.CCW);
//第四种方法绘制圆角矩形
path.addRoundRect(850, 950, 1050, 1100,new float[]{0, 0, 0, 0,50, 50, 50, 50}, Path.Direction.CCW);
canvas.drawPath(path, paint);
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