如上图所示,小球也需要随着圆弧的增长而不停地变化位置,保证一直处在圆弧顶点,,圆弧运动轨迹我已经画出来了,部分代码如下:
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    int mWidth = getMeasuredWidth();
    int mHeight = getMeasuredHeight();
    float section = progressValue / 100;//progressValue是传进来的值,由定时器不停地发送过来
    mPaint.setAntiAlias(true);//消除锯齿
    mPaint.setStrokeWidth((float) 8);
    mPaint.setStyle(Style.STROKE);
    mPaint.setStrokeCap(Cap.ROUND);
    rect.set(20, 20, mWidth - 20, mHeight - 20);
    mPaint.setColor(Color.BLACK);
    int count = mColors.length;
    int[] colors = new int[count];
    System.arraycopy(mColors, 0, colors, 0, count);
    LinearGradient shader = new LinearGradient(3, 3, mWidth - 3, mHeight - 3, colors, null, Shader.TileMode.CLAMP);
    mPaint.setShader(shader);
    //画弧，第一个参数是RectF,第二个参数是角度的开始，第三个参数是多少度，第四个参数是真的时候画扇形，是假的时候画弧线
    canvas.drawArc(rect, 90, section * 360, false, mPaint);}

如上图所示,小球也需要随着圆弧的增长而不停地变化位置,保证一直处在圆弧顶点,,圆弧运动轨迹我已经画出来了,部分代码如下:
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    int mWidth = getMeasuredWidth();
    int mHeight = getMeasuredHeight();
    float section = progressValue / 100;//progressValue是传进来的值,由定时器不停地发送过来
    mPaint.setAntiAlias(true);//消除锯齿
    mPaint.setStrokeWidth((float) 8);
    mPaint.setStyle(Style.STROKE);
    mPaint.setStrokeCap(Cap.ROUND);
    rect.set(20, 20, mWidth - 20, mHeight - 20);
    mPaint.setColor(Color.BLACK);
    int count = mColors.length;
    int[] colors = new int[count];
    System.arraycopy(mColors, 0, colors, 0, count);
    LinearGradient shader = new LinearGradient(3, 3, mWidth - 3, mHeight - 3, colors, null, Shader.TileMode.CLAMP);
    mPaint.setShader(shader);
    //画弧，第一个参数是RectF,第二个参数是角度的开始，第三个参数是多少度，第四个参数是真的时候画扇形，是假的时候画弧线
    canvas.drawArc(rect, 90, section * 360, false, mPaint);}