在弧形机器人的边缘添加一个圆圈？

Question

如何在圆弧的边缘添加小圆圈。
并且它也应该在时钟方向以弧边移动。
现在我使用改变扫描角度成功地为圆弧设置动画。
和黑点是剩余的。

下面是getView和animation类的代码

--- init method and implement constructor ----

 mRectF = new RectF(mWidth / 2 - 360, mHeight / 2 - 360, mWidth / 2 + 360, mHeight / 2 + 360);

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    //draw circle background
    mPaint.setColor(getResources().getColor(R.color.timer_background_color));
    canvas.drawCircle(mWidth / 2, mHeight / 2, 360, mPaint);

    mPaint.setColor(getResources().getColor(R.color.actionbar_back_color));
    canvas.drawArc(mRectF, mStartAnagle, mSweepAngle, false, mPaint);
}

public class TimerAnimation extends Animation{

    public TimerAnimation (float startAngle, float sweepAngle, long duration) {
        mStartAnagle = startAngle;
        mSweepAngle = sweepAngle;
        setDuration(duration);
        setRepeatCount(Animation.INFINITE);
        setInterpolator(new LinearInterpolator());
    }

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        if (!isComplete) {
            mSweepAngle = mSweepAngle + 6;
            if (mSweepAngle >= 360) {
                isComplete = true;
                mSweepAngle = 360;
            }
        } else {
            mStartAnagle = mStartAnagle + 6;
            mSweepAngle = mSweepAngle - 6;
            if (mStartAnagle >= 360)
                mStartAnagle = 0;
            if (mStartAnagle == 270 || mSweepAngle <= 0) {
                isComplete = false;
                mSweepAngle = 0;
            }
        }
        invalidate();
    }
}

Answer 1

也许你应该使用Path：

Path path = new Path();
// Set the starting position of the path to (0,0).
path.moveTo(0, 0);
path.arcTo(...); //draw your arc here
path.circleTo(); //draw a small circle here at the end of arc

也许您应该计算圆弧的结束位置并用作小圆的中心。