圆形上涨进度条

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    /**     * 设置画笔     */    private void initPaint() {         mPaint=new Paint();         mPaint.setColor(Color.RED);         mPaint.setAntiAlias(true);         mPaint.setStyle(Style.FILL);        }

上涨代码

    int MAX_VOLUME=100;    int mProgress=50;    float volume_sum_degree=-180;    float volume_down_degree=90;    @Override    protected void onDraw(Canvas canvas) {        super .onDraw(canvas);        if ( mProgress > MAX_VOLUME) {            mProgress = MAX_VOLUME;        }        // 得到当前音量占最大音量的百分比        double percent = ((double) mProgress) / MAX_VOLUME;        // 得到当前音量画扇形时从起始角度应该转过的角度        double degree = volume_sum_degree * percent ;        // 画扇形时的起始角度        double drawStartDegree = volume_down_degree - degree ;        RectF rect = new RectF(0 , 0, 200, 200) ;        canvas.drawArc(rect , //弧线所使用的矩形区域大小                ( float) drawStartDegree,  //开始角度                ( float) ((90 - drawStartDegree) * 2) , //扫过的角度                false, //是否使用中心                mPaint );    }

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