package com.tejia.lijin.app.util.view.countdown;
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import android.os.Handler;
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import android.os.Message;
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import android.os.SystemClock;
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public abstract class CustomCountDownTimer {
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private static final int MSG = 1;
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private final long mMillisInFuture;
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private final long mCountdownInterval;
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private long mStopTimeInFuture;
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private long mPauseTimeInFuture;
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private boolean isStop = false;
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private boolean isPause = false;
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/**
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* @param millisInFuture 总倒计时时间
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* @param countDownInterval 倒计时间隔时间
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*/
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public CustomCountDownTimer(long millisInFuture, long countDownInterval) {
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// 解决秒数有时会一开始就减去了2秒问题（如10秒总数的，刚开始就8999，然后没有不会显示9秒，直接到8秒）
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if (countDownInterval > 1000) millisInFuture += 15;
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mMillisInFuture = millisInFuture;
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mCountdownInterval = countDownInterval;
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}
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private synchronized CustomCountDownTimer start(long millisInFuture) {
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isStop = false;
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if (millisInFuture <= 0) {
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onFinish();
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return this;
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}
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mStopTimeInFuture = SystemClock.elapsedRealtime() + millisInFuture;
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mHandler.sendMessage(mHandler.obtainMessage(MSG));
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return this;
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}
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/**
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* 开始倒计时
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*/
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public synchronized final void start() {
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start(mMillisInFuture);
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}
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/**
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* 停止倒计时
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*/
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public synchronized final void stop() {
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isStop = true;
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mHandler.removeMessages(MSG);
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}
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/**
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* 暂时倒计时
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* 调用{@link #restart()}方法重新开始
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*/
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public synchronized final void pause() {
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if (isStop) return ;
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isPause = true;
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mPauseTimeInFuture = mStopTimeInFuture - SystemClock.elapsedRealtime();
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mHandler.removeMessages(MSG);
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}
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/**
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* 重新开始
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*/
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public synchronized final void restart() {
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if (isStop || !isPause) return ;
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isPause = false;
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start(mPauseTimeInFuture);
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}
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/**
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* 倒计时间隔回调
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* @param millisUntilFinished 剩余毫秒数
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*/
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public abstract void onTick(long millisUntilFinished);
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/**
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* 倒计时结束回调
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*/
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public abstract void onFinish();
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private Handler mHandler = new Handler() {
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@Override
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public void handleMessage(Message msg) {
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synchronized (CustomCountDownTimer.this) {
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if (isStop || isPause) {
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return;
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}
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final long millisLeft = mStopTimeInFuture - SystemClock.elapsedRealtime();
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if (millisLeft <= 0) {
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onFinish();
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} else {
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long lastTickStart = SystemClock.elapsedRealtime();
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onTick(millisLeft);
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// take into account user's onTick taking time to execute
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long delay = lastTickStart + mCountdownInterval - SystemClock.elapsedRealtime();
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// special case: user's onTick took more than interval to
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// complete, skip to next interval
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while (delay < 0) delay += mCountdownInterval;
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sendMessageDelayed(obtainMessage(MSG), delay);
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}
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}
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}
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};
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}
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