暂停和重启定时器使用作出处理 [英] Pause and Resume timer made using handlers

问题描述

下面是我的$ C $下的活动。在此，我打印的文本视图经过的时间。我想提出的onPause和onResume方法在此。它应该工作，使得时间暂停，而应用程序是在背景。当再一次被送往前线，应定时从那里暂停开始。我尝试过用这个code，但当时没有被暂停。它继续在后台运行。任何人可以帮助找到解决此。

 包com.example.test;
进口android.support.v7.app.ActionBarActivity;
进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.os.Handler;
进口android.view.Menu;
进口android.view.MenuItem;
进口android.widget.TextView;

公共类MainActivity延伸活动{
    TextView的TT1;
    私人处理程序customHandler =新的处理程序（）;
    长timeInMilliseconds = 0L，timeToGo = 0L，的startTime = 0L;
    @覆盖
    保护无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.activity_main）;
        TT1 =（TextView中）findViewById（R.id.textView1）;
        的startTime = System.currentTimeMillis的（）;
        customHandler.postDelayed（updateTimerThread，0）;
    }
    市民可运行updateTimerThread =新的Runnable（）{
        @覆盖
        公共无效的run（）{
            // TODO自动生成方法存根
            长timeNow = System.currentTimeMillis的（）;
            timeToGo = 30  - （timeNow  -  startTime时）/ 1000;
            TT1 =（TextView中）findViewById（R.id.textView1）;
            tt1.setText（timeToGo +）;
            如果（timeToGo＆LT; 0L）{
                意向意图=新的意图（MainActivity.this，Game.class）;
                完（）;
                startActivity（意向）;
                }
            其他
                customHandler.postDelayed（此，0）;
        }
    };
    @覆盖
    公共无效的onPause（）{
        super.onPause（）;
        customHandler.removeCallbacksAndMessages（空）;
    }
    @覆盖
    公共无效onResume（）{
        super.onResume（）; //总是先调用父类的方法
        customHandler.postDelayed（updateTimerThread，0）;
     }
 }
 

解决方案

  @覆盖
   保护无效的onPause（）{
                customHandler.removeCallbacks（updateTimerThread）;
               super.onPause（）; }
 

Here is my code for an activity. In this I am printing the time elapsed on a text view. I want to put onPause and onResume method in this. It should work such that the time is paused while app is in background . And when again brought to forefront, should timer start from where it paused. I tried it using this code but the time is not paused. It continues to run in background. Can anybody help to find workaround for this.

package com.example.test;
import android.support.v7.app.ActionBarActivity;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;

public class MainActivity extends Activity {
    TextView tt1;
    private Handler customHandler = new Handler();
    long timeInMilliseconds = 0L,timeToGo=0L,startTime=0L;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tt1=(TextView) findViewById(R.id.textView1);
        startTime=System.currentTimeMillis();
        customHandler.postDelayed(updateTimerThread, 0);
    }
    public Runnable updateTimerThread=new Runnable() {
        @Override
        public void run() {
            // TODO Auto-generated method stub
            long timeNow = System.currentTimeMillis();
            timeToGo = 30 - (timeNow - startTime) / 1000;
            tt1=(TextView) findViewById(R.id.textView1);
            tt1.setText(timeToGo+"");
            if(timeToGo<0L){
                Intent intent=new Intent(MainActivity.this,Game.class);
                finish();
                startActivity(intent);
                }
            else
                customHandler.postDelayed(this, 0);
        }
    };
    @Override
    public void onPause() {
        super.onPause();
        customHandler.removeCallbacksAndMessages(null);
    }
    @Override
    public void onResume() {
        super.onResume();  // Always call the superclass method first
        customHandler.postDelayed(updateTimerThread, 0);
     }
 }

解决方案

   @Override
   protected void onPause() {     
                customHandler.removeCallbacks(updateTimerThread);
               super.onPause(); }

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