安卓 service 后台运行，activity 启动和停止service

安卓activity界面，上面有两个按钮，一个是开始服务，一个是取消服务。

界面布局：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />


    <Button
        android:id="@+id/quxiao"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="65dp"
        android:text="取消服务" />

    <Button
        android:id="@+id/bangding"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/quxiao"
        android:layout_alignBottom="@+id/quxiao"
        android:layout_alignParentRight="true"
        android:layout_marginRight="66dp"
        android:text="开始服务" />

</RelativeLayout>

activity的代码：

package com.example.test2;

import java.util.Date;

import com.example.application.GlobalVaries;

import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
    private boolean isBound = false;
    TextView labelView;
    private Intent serviceIntent;
    private GlobalVaries global;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        global = (GlobalVaries) getApplication();
        labelView = (TextView) findViewById(R.id.textView1);
        Button bindButton = (Button) findViewById(R.id.bangding);
        Button unbindButton = (Button) findViewById(R.id.quxiao);
        
        myMainRunning();
        // 绑定按钮
        bindButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (!isBound) {
                    serviceIntent = new Intent(MainActivity.this,
                            MyService.class);
                    MainActivity.this.startService(serviceIntent);
                    isBound = true;
                    
                }
            }
        });
        // 取消绑定按钮
        unbindButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onDestroy();
                System.exit(0);
                finish();
            }
        });

    }
    
    private void myMainRunning() {
        final Handler handler = new Handler();  
        Runnable runnable = new Runnable(){  
             @Override  
             public void run() {  
                 // 在此处添加执行的代码   
                 
                 long nowTime = global.getNowTime();
                 labelView.setText(""+new Date(nowTime));
                 handler.postDelayed(this, 500);// 50是延时时长   
             }   
         };   
         handler.postDelayed(runnable, 1000);// 打开定时器，执行操作   
         handler.removeCallbacksAndMessages(this);// 关闭定时器处理  
    }

    @Override
    protected void onDestroy() {
        MainActivity.this.stopService(serviceIntent);
        super.onDestroy();
    }
    
    
}

服务部分的代码：

package com.example.test2;

import java.util.Date;

import com.example.application.GlobalVaries;

import android.app.Service;
import android.content.Intent;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

public class MyService extends Service {

    private GlobalVaries global;
        
    @Override
    public void onCreate() {
        Log.i("start", "MyService onCreate");
        global = (GlobalVaries) getApplication();
        myrunningProgram();
        super.onCreate();
    }

    private void myrunningProgram() {
        final Handler handler = new Handler();  
            Runnable runnable = new Runnable(){  
                 @Override  
                 public void run() {  
                     // 在此处添加执行的代码   
                     Toast.makeText(MyService.this, ""+new Date(), 
                             Toast.LENGTH_SHORT).show();
                     global.setNowTime(System.currentTimeMillis());
                     handler.postDelayed(this, 2000);// 50是延时时长   
                 }   
             };   
             handler.postDelayed(runnable, 1000);// 打开定时器，执行操作   
             handler.removeCallbacksAndMessages(this);// 关闭定时器处理  

    }

    //开启绑定
    @Override
    public IBinder onBind(Intent arg0) {
        //为了使Service支持绑定，需要在Service类中重载onBind()方法，并在onBind()方法中返回Service对象
        Toast.makeText(this, "本地绑定：MyService", 
                Toast.LENGTH_SHORT).show();
        System.out.println("----2");
        
        return null;
    }

    //取消绑定
    @Override
    public boolean onUnbind(Intent intent) {
        Toast.makeText(this, "取消本地绑定：MyService", 
                             Toast.LENGTH_SHORT).show();  
        System.out.println("----3");
        return false;
    }

    
}

还用到了一个全局变量：

package com.example.application;

import android.app.Application;

public class GlobalVaries extends Application {

    private long nowTime;

    public long getNowTime() {
        return nowTime;
    }

    public void setNowTime(long nowTime) {
        this.nowTime = nowTime;
    }
}

配置文件中需要对service和全局变量进行配置：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.test2"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:name="com.example.application.GlobalVaries"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.test2.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".MyService">
            <intent-filter android:name="com.example.test2.MyService">
            </intent-filter>
        </service>
    </application>

</manifest>

根据需求可以修改相应部分的代码。以上代码就是为了实现自己的需求。