原理就是画一个圆弧,然后用内圆去覆盖圆弧实心的地方,然后写一个监听去时时更新进度条的进度.
分为外圆,内圆,文字进度:
1: 外圆:

mCirclePaint = new Paint();
        mCirclePaint.setAntiAlias(true);
        mCirclePaint.setStrokeWidth(CIRCLE_LINE_WIDTH);
        mCirclePaint.setStyle(Paint.Style.STROKE);
        mCirclePaint.setColor(Color.BLACK);

2.内圆:

mCircleInnerPaint = new Paint();
        mCircleInnerPaint.setAntiAlias(true);
        mCircleInnerPaint.setStyle(Paint.Style.FILL);
        mCircleInnerPaint.setColor(Color.WHITE);

3.文字进度:

 mTextPaint = new TextPaint();
        mTextPaint.setAntiAlias(true);
        mTextPaint.setStyle(Paint.Style.FILL);
        mTextPaint.setTypeface(Typeface.DEFAULT_BOLD);
        mTextPaint.setColor(Color.BLUE);
        mTextPaint.setTextSize(100);

然后把这三个画出来:

canvas.drawCircle(halfWidth, halfHeight, CIRCLE_RADIUS,mCirclePaint);//外圆
canvas.drawCircle(halfWidth, halfHeight, CIRCLE_RADIUS - CIRCLE_LINE_WIDTH / 2, mCircleInnerPaint);//内圆
canvas.drawText(mProgressText,halfWidth - mTextPaint.measureText(mProgressText) / 2,halfHeight - (mTextPaint.ascent() + mTextPaint.descent()) / 2,mTextPaint);//文字进度

------------------------------------------------分割线-------------------------------------------------
圆弧:

  if (mStartProgress){
            mCirclePaint.setColor(Color.BLACK);
            if (mCircleRectF == null){
                mCircleRectF = new RectF(halfWidth - CIRCLE_RADIUS, halfHeight - CIRCLE_RADIUS, halfWidth + CIRCLE_RADIUS, halfHeight + CIRCLE_RADIUS);
            }
            if (mStartProgress) {

                float swipeProgress = mProgress / 100f * 360;
                canvas.drawArc(mCircleRectF, -90, swipeProgress, true, mCirclePaint);
            } else {
                canvas.drawCircle(halfWidth, halfHeight, CIRCLE_RADIUS,mCirclePaint);
            }
        }

公共接口:

public void setProgress(float progress) {
        if (progress > 100) {
            progress = 100;
        }
        if (progress < 0) {
            progress = 0;
        }
        mProgress = progress;
        mProgressText =  Float.toString(progress);
        mStartProgress = true;
        postInvalidate();
    }

 public float getCurrentProgress() {
        return mProgress;
    }
 public void progressFinished() {
        mStartProgress = false;
    }

在activity中调用:

private void startProgress() {
        new Thread() {
            @Override
            public void run() {
                super.run();
                float currentProgress = myCircleView.getCurrentProgress();
                ++currentProgress;
                myCircleView.setProgress(currentProgress);
                try {
                    sleep(300);
                    if (currentProgress <= 100) {
                        startProgress();
                    } else {
                        myCircleView.progressFinished();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }.start();
    }