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();
  }