现有
官方CountDownTimer类使用示例：
new CountDownTimer(30000, 1000) {
public void onTick(long millisUntilFinished) {
mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
}
public void onFinish() {
mTextField.setText("done!");
}
}.start();
只有定时功能，无暂停及恢复并继续的功能，也无进行过程动态修改导计时时间．
改进
import android.os.CountDownTimer;
import android.util.Log;
/**
* 支持pause的倒计时, 由CountDownTimer实现的，注意CountdownTimer的源码，start(),pause(),cancel()方法都是用message和handler实现的
* 如果是在子线程中执行，要加调用Looper.prepare()及Looper.loop()
* 或者是使用 runOnMainThread 使其在主线程中执行
*
* @author zm
*/
public abstract class CountDownTimerExt {
private static final String TAG = "CountDownTimerExt";
/**
* 倒计时实现类
*/
private CountDownTimer countDownTimer;
/**
* 间隔
*/
private long mInterval;
private boolean isTimerPaused;
private long millisInFuture;
private long remainingTime;
/**
* @param millisInFutureIn 总时长
* @param interval onTick间隔
*/
public CountDownTimerExt(long millisInFutureIn, long interval) {
mInterval = interval;
isTimerPaused = true;
millisInFuture = millisInFutureIn;
remainingTime = millisInFutureIn;
}
public final boolean isTimerPaused() {
return isTimerPaused;
}
public final void setTimerPaused(boolean value) {
isTimerPaused = value;
}
public final long getMillisInFuture() {
return millisInFuture;
}
public final void setMillisInFuture(long value) {
millisInFuture = value;
}
public final long getRemainingTime() {
return remainingTime;
}
public final void setRemainingTime(long value) {
remainingTime = value;
}
public final void start() {
startIt(remainingTime, mInterval);
}
public final void start(long millisInFutureIn, long remainingTimeIn, long interval) {
millisInFuture = millisInFutureIn;
remainingTime = remainingTimeIn;
mInterval = interval;
start();
}
public final synchronized void startIt(long millisInFutureIn, long interval) {
remainingTime = millisInFutureIn;
mInterval = interval;
if (millisInFuture > 0L && interval > 0L) {
if (!isTimerPaused) {
// 有运行中的先stop
stop();
}
if (isTimerPaused) {
// 有暂停或未运行的，创建CountDownTimer实现, 确保运行在主线程
countDownTimer = (CountDownTimer)(new CountDownTimer(getRemainingTime(), mInterval) {
@Override
public void onFinish() {
onTimerFinish();
stop();
}
@Override
public void onTick(long millisUntilFinished) {
// 这里会记录剩余的时长保存到remainingTime, 方便暂停后能再恢复
setRemainingTime(millisUntilFinished);
onTimerTick(millisUntilFinished);
}
});
try {
countDownTimer.start();
} catch (Exception e) {
e.printStackTrace();
}
isTimerPaused = false;
} else {
Log.d(TAG, "ignore start");
}
} else {
Log.d(TAG, "invalid parameter");
}
}
/**
* 停止
*/
public final void stop() {
try {
countDownTimer.cancel();
} catch (Exception e) {
e.printStackTrace();
}
isTimerPaused = true;
remainingTime = millisInFuture;
}
/**
* 暂停
*/
public final void pause() {
if (!isTimerPaused) {
try {
countDownTimer.cancel();
} catch (Exception e) {
e.printStackTrace();
}
isTimerPaused = true;
}
}
/**
* 恢复
*/
public final void resume() {
if (!isRunning()) {
// 通过remainingTime得到剩余的时长
startIt(remainingTime, mInterval);
}
}
/**
* 运行中
* @return
*/
public final boolean isRunning() {
return !isTimerPaused;
}
/**
* 每次触发倒计时回调
* @param value
*/
public abstract void onTimerTick(long value);
/**
* 倒计时完成回调
*/
public abstract void onTimerFinish();
}
示例
// 倒计时计时器
CountDownTimerExt countDownTimer = new CountDownTimerExt(restTimeMs, 1000) {
@Override
public void onTimerTick(long value) {
}
@Override
public void onTimerFinish() {
close();
}
};
countDownTimer.start();
countDownTimer.pause();
countDownTimer.resume();
作者：帅得不敢出门 出处