@Overrideprotected void onDraw(Canvas canvas) {    super.onDraw(canvas);    Path path = new Path();    path.reset();    path.moveTo(500,500);    path.lineTo(1000,1000);    Paint mPaint = new Paint();    //参考下面6行    mPaint.setStrokeWidth(5f);    mPaint.setColor(Color.RED);    mPaint.setDither(true);    mPaint.setStyle(Paint.Style.STROKE);    mPaint.setStrokeJoin(Paint.Join.ROUND);    mPaint.setStrokeCap(Paint.Cap.ROUND);    canvas.drawPath(path,mPaint);}