卡西欧怎么清除计时器数据，android 清除所有计时器,android-如何从onTick方法中清除CountDownTimer？

AFAIK您不能那样做

但是,Android CountDownTimer类具有Drop-in替代项,但是您可以在onTick中取消该替代项.

卡西欧怎么清除计时器数据，干得好

/*

* Copyright (C) 2008 The Android Open Source Project

安卓10能用的计时器、*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

计时器 安卓，* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

判断计时器是否已停止，*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

Android计时器，* 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.

*/

package alt.android.os;

import android.util.Log;

import android.os.Handler;

import android.os.SystemClock;

import android.os.Message;

/**

* 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:

*

*

* new CountdownTimer(30000, 1000) {

*

* public void onTick(long millisUntilFinished) {

* mTextField.setText("seconds remaining: " + millisUntilFinished / 1000);

* }

*

* public void onFinish() {

* mTextField.setText("done!");

* }

* }.start();

*

*

* 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 CountDownTimer {

/**

* Millis since epoch when alarm should stop.

*/

private final long mMillisInFuture;

/**

* The interval in millis that the user receives callbacks

*/

private final long mCountdownInterval;

private long mStopTimeInFuture;

private boolean mCancelled = false;

/**

* @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 CountDownTimer(long millisInFuture, long countDownInterval) {

mMillisInFuture = millisInFuture;

mCountdownInterval = countDownInterval;

}

/**

* Cancel the countdown.

*

* Do not call it from inside CountDownTimer threads

*/

public final void cancel() {

mHandler.removeMessages(MSG);

mCancelled = true;

}

/**

* Start the countdown.

*/

public synchronized final CountDownTimer start() {

if (mMillisInFuture <= 0) {

onFinish();

return this;

}

mStopTimeInFuture = SystemClock.elapsedRealtime() + mMillisInFuture;

mHandler.sendMessage(mHandler.obtainMessage(MSG));

mCancelled = false;

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(CountDownTimer.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;

if (!mCancelled) {

sendMessageDelayed(obtainMessage(MSG), delay);

}

}

}

}

};

}