Android 倒计时——Timer和CountDownTimer的使用，实现启动，暂停，继续，重复，重设时长以及启动service后台倒计时_countdowntimer 会重叠

实现效果

单个倒计时功能                                                                                 列表倒计时功能

自定义倒计时类

public class CountDownTimerSupport implements ITimerSupport {
    private Timer mTimer;
 
    private Handler mHandler;
 
    /**
     * 倒计时时间
     */
    private long mMillisInFuture;
 
    /**
     * 间隔时间
     */
    private long mCountDownInterval;
    /**
     * 倒计时剩余时间
     */
    private long mMillisUntilFinished;
 
    private OnCountDownTimerListener mOnCountDownTimerListener;
 
    private TimerState mTimerState = TimerState.FINISH;
 
    @Deprecated
    public CountDownTimerSupport() {
        this.mHandler = new Handler();
    }
 
    public CountDownTimerSupport(long millisInFuture, long countDownInterval) {
        this.setMillisInFuture(millisInFuture);
        this.setCountDownInterval(countDownInterval);
        this.mHandler = new Handler();
    }
 
    @Override
    public void start() {
        //防止重复启动 重新启动要先reset再start
        if (mTimer == null && mTimerState != TimerState.START) {
            mTimer = new Timer();
            mTimer.scheduleAtFixedRate(createTimerTask(), 0, mCountDownInterval);
            mTimerState = TimerState.START;
        }
    }
 
    @Override
    public void pause() {
        if (mTimer != null && mTimerState == TimerState.START) {
            cancelTimer();
            mTimerState = TimerState.PAUSE;
        }
    }
 
    @Override
    public void resume() {
        if (mTimerState == TimerState.PAUSE) {
            start();
        }
    }
 
    @Override
    public void stop() {
        if (mTimer != null) {
            cancelTimer();
            mMillisUntilFinished = mMillisInFuture;
            mTimerState = TimerState.FINISH;
 
            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    if (mOnCountDownTimerListener != null) {
                        mOnCountDownTimerListener.onFinish();
                    }
                }
            });
        }
    }
 
    @Override
    public void reset() {
        if (mTimer != null) {
            cancelTimer();
        }
        mMillisUntilFinished = mMillisInFuture;
        mTimerState = TimerState.FINISH;
    }
 
 
    private void cancelTimer() {
        mTimer.cancel();
        mTimer.purge();
        mTimer = null;
    }
 
    public boolean isStart() {
        return mTimerState == TimerState.START;
    }
 
    public boolean isFinish() {
        return mTimerState == TimerState.FINISH;
    }
 
    /**
     * @deprecated 使用构造方法
     * @param millisInFuture
     */
    @Deprecated
    public void setMillisInFuture(long millisInFuture) {
        this.mMillisInFuture = millisInFuture;
        this.mMillisUntilFinished = mMillisInFuture;
    }
 
    /**
     * @deprecated 使用构造方法
     * @param countDownInterval
     */
    @Deprecated
    public void setCountDownInterval(long countDownInterval) {
        this.mCountDownInterval = countDownInterval;
    }
 
    public void setOnCountDownTimerListener(OnCountDownTimerListener listener) {
        this.mOnCountDownTimerListener = listener;
    }
 
    public long getMillisUntilFinished() {
        return mMillisUntilFinished;
    }
 
    public TimerState getTimerState() {
        return mTimerState;
    }
 
    /**
     * @param millisInFuture
     * @param countDownInterval
     * @return
     * @deprecated 已更换Timer
     */
    @Deprecated
    protected CountDownTimer createCountDownTimer(long millisInFuture, long countDownInterval) {
        return null;
    }
 
    protected TimerTask createTimerTask() {
        return new TimerTask() {
            private long startTime = -1;
 
            @Override
            public void run() {
                if (startTime < 0) {
                    //第一次回调 记录开始时间
 
                    startTime = scheduledExecutionTime() - (mMillisInFuture - mMillisUntilFinished);
 
                    mHandler.post(new Runnable() {
                        @Override
                        public void run() {
                            if (mOnCountDownTimerListener != null) {
                                mOnCountDownTimerListener.onTick(mMillisUntilFinished);
                            }
                        }
                    });
                } else {
                    //剩余时间
                    mMillisUntilFinished = mMillisInFuture - (scheduledExecutionTime() - startTime);
 
                    mHandler.post(new Runnable() {
                        @Override
                        public void run() {
                            if (mOnCountDownTimerListener != null) {
                                mOnCountDownTimerListener.onTick(mMillisUntilFinished);
                            }
                        }
                    });
                    if (mMillisUntilFinished <= 0) {
                        //如果没有剩余时间 就停止
                        stop();
                    }
                }
            }
        };
    }
 
}

2、初始化

private CountDownTimerSupport mTimer;

 mTimer = new CountDownTimerSupport(duration * 1000, 1000);

        mTimer.setOnCountDownTimerListener(new OnCountDownTimerListener() {
                @Override
                public void onTick(long millisUntilFinished) {
                    tv.setText(millisUntilFinished + "ms\n" + millisUntilFinished / 1000 + "s");//倒计时
//                    textView.setText((60 * 1000 - millisUntilFinished) / 1000 + "S");//正计时
                    Log.d("CountDownTimerSupport", "onTick : " + millisUntilFinished + "ms");
                }
 
                @Override
                public void onFinish() {
                    tv.setText("已停止");
                    Log.d("CountDownTimerSupport", "onFinish");
                }
            });

启动

mTimer.start();

暂停

mTimer.pause();

继续

mTimer.resume();

停止

mTimer.stop();

重复启动，重设时长

            mTimer.reset();//重复启动
//            mTimer.setMillisInFuture(30000);//重设时长
            mTimer.start();//重复启动

// 发送带有数据的广播
private void broadcastUpdate(final String action, String time) {
    final Intent intent = new Intent(action);
    intent.putExtra("time", time);
    sendBroadcast(intent);
}

//        发送广播方法——更新倒计时
        broadcastUpdate(IN_RUNNING, time / 1000 + "");
 
 
//        关闭服务，停止倒计时
        Intent countDownIntent = new Intent(MainActivity.this, CodeTimerService.class);
        stopService(countDownIntent);
        finish();

实现demo： https://download.csdn.net/download/meixi_android/12484271

bug在线交流：QQ1085220040