0

I have a countdown timer and I want to add 10 seconds to it whenever my isAddTime method is true. I have successfully added it but whenever the time is added, it still finishes on the current time.

I am cancelling it in OnTick Method i tried to cancel it in other class and i successfully cancel it but i cant resume the timer.. since to cancel it in another class it will be static.

Here's my code: 

timerHolder = new CountDownTimer(30000, 1000) {

            @Override
            public void onFinish() {
                Class.isAddTime = false;
                Intent i = new Intent(getBaseContext(), OtherClass.class);
                startActivity(i);
            }

            @Override
            public void onTick(long millisUntilFinished) {
                timeLeft = millisUntilFinished;              
                if(Class.isAddTime()){
                    timerHolder.cancel();
                    AddTime();
                    Class.isAddTime = false;
                }
                timer.setText("Time left: " + String.valueOf(timeLeft / 1000));
            }
        }.start();

And here is the AddTime():

private void AddTime(){
     timerHolder = new CountDownTimer(timeLeft + 10000, 1000) {

         @Override
         public void onFinish() {
             Class.isAddTime = false;
             Intent i = new Intent(getBaseContext(), OtherClass.class);
             startActivity(i);
         }

         @Override
         public void onTick(long millisUntilFinished) {
             timeLeft += 10000;
             timeLeft = millisUntilFinished;               
             if(Class.isAddTime()){
                 timerHolder.cancel();
                 AddTime();
                 Class.isAddTime = false;
             }
             timer.setText("Time left: " + String.valueOf(timeLeft / 1000));
         }
     }.start();

I was wondering why it still continue the current time even if i had it cancelled? is there other way to call cancel? is there more clean solution on how i can add time to the countdown timer?

4

2 回答 2

0

取消后制作timerHolder对象。null

if(Class.isAddTime()){
      timerHolder.cancel();
      timerHolder=null;
      AddTime();
      Class.isAddTime = false;
}
于 2013-09-11T04:06:53.137 回答
0

有些人通过使用自定义计时器解决了这个问题。使用此计时器，您将能够取消 onTick() 方法中的时间。

https://gist.github.com/Gautier/737759

这是 Github 上的代码。希望能帮助到你。

/*
 * 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.
 */

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:
 *
 * <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 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);
                    }
                }
            }
        }
    };
}
于 2015-05-02T11:15:41.910 回答