java - 为什么在新类中启动计时器时它可以工作，但当尝试停止计时器时却不能？

Question

由于某种原因，计时器启动正常，但永远不会停止。

我创建了一个新类:

package com.test.webservertest;

import android.os.Handler;
import android.os.SystemClock;
import android.widget.TextView;

/**
 * Created by me on 11/18/2015.
 */

public class Timers
{
    private long startTime = 0L;
    private Handler customHandler = new Handler();
    private long timeInMilliseconds = 0L;
    private long timeSwapBuff = 0L;
    private long updatedTime = 0L;
    private String recordtimer;
    private Runnable updateTimerThread;

    public void StartTimer(TextView timerValue) {
        startTime = SystemClock.uptimeMillis();
        customHandler.postDelayed(updateTimerThread = new UpdateTimerThread(timerValue), 0);
    }

    public void StopTimer(TextView timerValue) {
        timeSwapBuff += timeInMilliseconds;
        customHandler.removeCallbacks(updateTimerThread = new UpdateTimerThread(timerValue));
    }


    public class UpdateTimerThread implements Runnable {
        protected TextView timerValue;

        public UpdateTimerThread(TextView timerValue) {
            this.timerValue= timerValue;
        }

        public void run() {

            timeInMilliseconds = SystemClock.uptimeMillis() - startTime;

            updatedTime = timeSwapBuff + timeInMilliseconds;

            int secs = (int) (timeInMilliseconds / 1000);
            int mins = secs / 60;
            secs = secs % 60;
            int hours = mins / 60;
            mins = mins % 60;
            recordtimer = "Recording Time: " + String.format("%02d", hours) + ":" + String.format("%02d", mins) + ":" + String.format("%02d", secs);
            timerValue.post(new Runnable()
            {
                public void run()
                {
                    timerValue.setText(recordtimer);
                }
            });
            //set yout textview to the String timer here
            customHandler.postDelayed(this, 1000);
        }
    }


}

然后在 MainActivity 中我做了:

if (is_start == true)
                                {
                                    timers.StartTimer(timerValueRecord);  
                                    response = Get(iptouse + "start");
                                    is_start = false;
                                } else
                                {
                                    timers.StopTimer(timerValueRecord);
                                    textforthespeacch = "Recording stopped and preparing the file to be shared on youtube";
                                    MainActivity.this.initTTS();
                                    response = Get(iptouse + "stop");
                                    is_start = true;
                                    startuploadstatusthread = true;
                                    servercheckCounter = 0;
                                }

计时器然后启动，但在执行时并没有停止

timers.StopTimer(timerValueRecord);

我用断点检查了它是否到达那里，但计时器永远不会停止并继续。

Answer 1

customHandler.removeCallbacks(updateTimerThread);

而不是

customHandler.removeCallbacks(updateTimerThread = new UpdateTimerThread(timerValue));

如果您销毁某个对象并在其位置创建一个新对象，则不能指望处理程序找到该对象。