Android 用新的时间重新启动倒计时
当倒计时结束时,我想用新的时间重新启动倒计时。我给出的代码如下:Android 用新的时间重新启动倒计时,android,countdowntimer,Android,Countdowntimer,当倒计时结束时,我想用新的时间重新启动倒计时。我给出的代码如下: futureInMillis = newTime(); CountDownTimer remainingTimeCounter = new CountDownTimer(futureInMillis, 1000) { public void onTick(long millisUntilFinished) { remainingTime = cal
futureInMillis = newTime();
CountDownTimer remainingTimeCounter = new CountDownTimer(futureInMillis, 1000) {
public void onTick(long millisUntilFinished) {
remainingTime = calculateRemainingTime(millisUntilFinished / 1000);
runOnUiThread(updateTime);
}
public void onFinish() {
// TODO: restart counter
cancel();
futureInMillis = newTime();
// remainingTimeCounter = null;
this.start();
}
}.start();
我们应该知道
newTime()
做什么,并且您不必调用方法cancel()
,因为计时器位于onFinish()
方法中,这意味着计时器已完成倒计时:
futureInMillis = newTime();
CountDownTimer remainingTimeCounter = new CountDownTimer(futureInMillis, 1000) {
public void onTick(long millisUntilFinished) {
remainingTime = calculateRemainingTime(millisUntilFinished / 1000);
runOnUiThread(updateTime);
}
public void onFinish() {
// TODO: restart counter
cancel();
futureInMillis = newTime();
// remainingTimeCounter = null;
this.start();
}
}.start();
CountDownTimer remainingTimeCounter = new CountDownTimer(futureInMillis, 1000) {
public void onTick(long millisUntilFinished) {
remainingTime = calculateRemainingTime(millisUntilFinished / 1000);
runOnUiThread(updateTime);
}
public void onFinish() {
// TODO: restart counter
//cancel(); // there is no need the call the cancel() method here
futureInMillis = newTime();
// remainingTimeCounter = null;
this.start();
}
}.start();
编辑:
futureInMillis = newTime();
CountDownTimer remainingTimeCounter = new CountDownTimer(futureInMillis, 1000) {
public void onTick(long millisUntilFinished) {
remainingTime = calculateRemainingTime(millisUntilFinished / 1000);
runOnUiThread(updateTime);
}
public void onFinish() {
// TODO: restart counter
cancel();
futureInMillis = newTime();
// remainingTimeCounter = null;
this.start();
}
}.start();
类CountDownTimer
中没有用于更改未来单位的属性,
如果你想使用它,你应该使用两个倒数计时器;您应该创建两个类,每个类都有一个计时器和一个futureInMillis属性,然后当第一个类的计时器完成时,实例化第二个类,将futureInMillis传递给它,并启动她的计时器,反之亦然
futureInMillis = newTime();
CountDownTimer remainingTimeCounter = new CountDownTimer(futureInMillis, 1000) {
public void onTick(long millisUntilFinished) {
remainingTime = calculateRemainingTime(millisUntilFinished / 1000);
runOnUiThread(updateTime);
}
public void onFinish() {
// TODO: restart counter
cancel();
futureInMillis = newTime();
// remainingTimeCounter = null;
this.start();
}
}.start();
**EDIT 2 :**
或者只需从源代码android编辑类CountDownTimer的源代码,并为属性futureInMillis添加setter和getter,如下所示:
futureInMillis = newTime();
CountDownTimer remainingTimeCounter = new CountDownTimer(futureInMillis, 1000) {
public void onTick(long millisUntilFinished) {
remainingTime = calculateRemainingTime(millisUntilFinished / 1000);
runOnUiThread(updateTime);
}
public void onFinish() {
// TODO: restart counter
cancel();
futureInMillis = newTime();
// remainingTimeCounter = null;
this.start();
}
}.start();
/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//add your package declaration here
import android.util.Log;
/**
* Schedule a countdown until a time in the future, with
* regular notifications on intervals along the way.
*
* Example of showing a 30 second countdown in a text field:
*
* <pre class="prettyprint">
* new CountdownTimer(30000, 1000) {
*
* public void onTick(long millisUntilFinished) {
* mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);
* }
*
* public void onFinish() {
* mTextField.setText("done!");
* }
* }.start();
* </pre>
*
* The calls to {@link #onTick(long)} are synchronized to this object so that
* one call to {@link #onTick(long)} won't ever occur before the previous
* callback is complete. This is only relevant when the implementation of
* {@link #onTick(long)} takes an amount of time to execute that is significant
* compared to the countdown interval.
*/
public abstract class MyCountDownTimer {
/**
* Millis since epoch when alarm should stop.
*/
private long mMillisInFuture;
/**
* The interval in millis that the user receives callbacks
*/
private long mCountdownInterval;
private long mStopTimeInFuture;
/**
* @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) {
mMillisInFuture = millisInFuture;
mCountdownInterval = countDownInterval;
}
public void setMillisInFuture(long millisInFuture) {
this.mMillisInFuture = millisInFuture;
}
public void setCountdownInterval(long countdownInterval) {
this.mCountdownInterval = countDownInterval;
}
/**
* Cancel the countdown.
*/
public final void cancel() {
mHandler.removeMessages(MSG);
}
/**
* Start the countdown.
*/
public synchronized final MyCountDownTimer start() {
if (mMillisInFuture <= 0) {
onFinish();
return this;
}
mStopTimeInFuture = SystemClock.elapsedRealtime() + mMillisInFuture;
mHandler.sendMessage(mHandler.obtainMessage(MSG));
return this;
}
/**
* Callback fired on regular interval.
* @param millisUntilFinished The amount of time until finished.
*/
public abstract void onTick(long millisUntilFinished);
/**
* Callback fired when the time is up.
*/
public abstract void onFinish();
private static final int MSG = 1;
// handles counting down
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
synchronized (MyCountDownTimer.this) {
final long millisLeft = mStopTimeInFuture - SystemClock.elapsedRealtime();
if (millisLeft <= 0) {
onFinish();
} else if (millisLeft < mCountdownInterval) {
// no tick, just delay until done
sendMessageDelayed(obtainMessage(MSG), millisLeft);
} else {
long lastTickStart = SystemClock.elapsedRealtime();
onTick(millisLeft);
// take into account user's onTick taking time to execute
long delay = lastTickStart + mCountdownInterval - SystemClock.elapsedRealtime();
// special case: user's onTick took more than interval to
// complete, skip to next interval
while (delay < 0) delay += mCountdownInterval;
sendMessageDelayed(obtainMessage(MSG), delay);
}
}
}
};
}
MyCountDownTimer remainingTimeCounter = new MyCountDownTimer(futureInMillis, 1000) {
public void onTick(long millisUntilFinished) {
remainingTime = calculateRemainingTime(millisUntilFinished / 1000);
runOnUiThread(updateTime);
}
public void onFinish() {
// TODO: restart counter with millisInFuture = 4000 ( 4 seconds )
//cancel(); // there is no need the call the cancel() method here
this.setMillisInFuture(4000); // here we change the millisInFuture of our timer
this.start();
}
}.start();
有什么问题吗?有问题吗?我想在调用计数器onFinish()时重新启动倒计时。此代码重新启动计时器,但不更改时间。谢谢回答。对于硬编码的millisInFuture,它可以正常工作,但如果我调用我的方法futureInMillis=newTime();StackOverflowException发生。请为类newTime()添加代码,以便我们了解如何使其工作:)完美解决方案。。!