Android自定义view实现太极效果实例代码

private void inital() {    whitePaint = new Paint();    whitePaint.setAntiAlias(true);    whitePaint.setColor(Color.WHITE);    blackPaint = new Paint();    blackPaint.setAntiAlias(true);    blackPaint.setColor(Color.BLACK);  }

 protected void onDraw(Canvas canvas) {    super.onDraw(canvas);    Point centerPoint = new Point(width / 2, height / 2);    canvas.translate(centerPoint.x, centerPoint.y);    canvas.rotate(angle);    //绘制两个半圆    int radius = Math.min(bitmapwidth, bitmapheight) / 2;    RectF rect = new RectF(-radius, -radius, radius, radius);  //绘制区域    canvas.drawArc(rect, 90, 180, true, blackPaint);      //绘制黑色半圆    canvas.drawArc(rect, -90, 180, true, whitePaint);      //绘制白色半圆    //绘制两个小圆    int smallRadius = radius / 2;    canvas.drawCircle(0, -smallRadius, smallRadius, blackPaint);    canvas.drawCircle(0, smallRadius, smallRadius, whitePaint);    //绘制鱼眼    canvas.drawCircle(0, -smallRadius, smallRadius / 4, whitePaint);    canvas.drawCircle(0, smallRadius, smallRadius / 4, blackPaint);    if (load) {      angle += 10;      if (angle >= 360) {        angle = 0;      }    }    invalidate();  }