<span style="white-space:pre">   </span>TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.CircleTextView);width = ta.getDimension(R.styleable.CircleTextView_width, 1);                      //圆环宽度stroke = ta.getColor(R.styleable.CircleTextView_stroke, Color.RED);                //圆环颜色background = ta.getColor(R.styleable.CircleTextView_back, Color.TRANSPARENT);      //canvas背景million_time = ta.getFloat(R.styleable.CircleTextView_million_time, 3000);         //倒计时时间per_million_time = ta.getFloat(R.styleable.CircleTextView_per_million_time, 100);  //倒计时间隔seq = ta.getInt(R.styleable.CircleTextView_seq, 1);                                //顺序（positive：正序，negative：倒序）ta.recycle();

    @Overrideprotected void onDraw(Canvas canvas) {//绘制背景paint.setColor(background);paint.setStyle(Paint.Style.FILL);canvas.drawCircle(canvas.getWidth() / 2, canvas.getHeight() / 2, canvas.getWidth() / 2, paint);//绘制初始外框paint.setColor(Color.LTGRAY);canvas.drawColor(Color.TRANSPARENT);paint.setStrokeWidth(width);paint.setStyle(Paint.Style.STROKE);//绘制进度条canvas.drawArc(rectF, -90, 360, false, paint);paint.setColor(stroke);canvas.drawArc(rectF, -90, per * 360, false, paint);super.onDraw(canvas);}

    private void drawProgress(float p) {this.per = p;this.postInvalidate();}

private class MyCountDownTimer extends CountDownTimer {/*** @param millisInFuture    The number of millis in the future from the call*                          to {@link #start()} until the countdown is done and {@link #onFinish()}*                          is called.* @param countDownInterval The interval along the way to receive*                          {@link #onTick(long)} callbacks.*/public MyCountDownTimer(long millisInFuture, long countDownInterval) {super(millisInFuture, countDownInterval);}@Overridepublic void onTick(long millisUntilFinished) {drawProgress(1 - millisUntilFinished / million_time);if(seq == 0)ct.setText((int) (million_time - millisUntilFinished) / 1000 + "s");elsect.setText(((int) (millisUntilFinished) / 1000 + 1) + "s");}@Overridepublic void onFinish() {ct.drawProgress(1);if(seq == 0) {ct.setText((int) (million_time / 1000) + "s");} else {ct.setText("0s");}}

添加倒计时完成的监听功能：

<span style="white-space:pre">    </span>public interface ResultListener {<span style="white-space:pre">       </span>public void onBegin();<span style="white-space:pre">      </span>public void onFinish();
<span style="white-space:pre"> </span>}

同时，在CirCleTextView中，添加此listener，并在控件的start()函数中传递onBegin消息及倒计时类中的onFinish()函数中传递onFinish()消息。