Service

public class MainActivity extends Activity implements OnClickListener {
/** Called when the activity is first created. */ 
    private Button startService,redirectButton;
   
    public static MainActivity mainActivity;
    @Override 
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        startService=(Button)findViewById(R.id.startButton); 
        redirectButton=(Button)findViewById(R.id.redirectId);
      Log.e("Main", "onCreate======================>") ;
      startService(new Intent("com.test.android.SERVICE"));
     
    }
   
   
    public void onAttachedToWindow () {
        System.out.println("Page01 -->onAttachedToWindow");
        this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
        super.onAttachedToWindow();
    }

   
   
   
   
   
   
    @Override
    public void onClick(View v) {
    // TODO Auto-generated method stub
   
    switch(v.getId())
    {
    case R.id.redirectId:
    break;
    }
    }
   
   
   
 

    @Override
    protected void onStart()
    {
   
   
    super.onStart();
    mainActivity=this;
    Log.e("Main", "onStart======================>") ;
    }
   

    @Override
    protected void onStop() {
    // TODO Auto-generated method stub
    super.onStop();
    Log.e("Main", "onStop======================>") ;
    }
   
   
    @Override
    protected void onResume() {
    // TODO Auto-generated method stub

   
    super.onResume();
    Log.e("Main", "onResume======================>") ;
    if(!SipService.isOnForeground)
    this.onStop();
    }
   
   
 
 
}








======

public class SecondActivity extends Activity implements OnClickListener{

private Button closeButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second); 
closeButton=(Button)findViewById(R.id.closeId);
closeButton.setOnClickListener(this);
}


@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId())
{
case R.id.closeId:
finish();
if(!SipService.isOnForeground)
{
Log.e("SecondActivity", "begin to close Main");

Log.e("mainActivity", "mainActivity="+MainActivity.mainActivity.isFinishing());
MainActivity.mainActivity.onStop();
}

break;
    default:break;
}

}


}




==================
public class SipService extends Service{

private ActivityManager activityManager;
    private String packageName;
   
    //应用是否运行在前端
    public static boolean isOnForeground=true;
   
   private static Handler handler;
  
  
   
   
    //休眠唤醒锁
    private static PowerManager.WakeLock mWakeLock = null;
   
   
    //唤醒加锁
    public static void acquireWakeLock(Context context)
    {
        if (mWakeLock ==  null)
        {
            Log.i("", "Acquiring wake lock");          
            PowerManager powerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
            mWakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP,
                    context.getClass().getCanonicalName());
            mWakeLock.acquire();
        }      
    }
   

@Override
    public void onCreate()
    {
        super.onCreate();
        Log.e("SipService", "------------->service---onCreate!!!");
       
        //acquireWakeLock(this.getApplicationContext());
        acceptHandler();
       
        Timer timer=new Timer();
        timer.schedule(task,5000,60000);
       
//         audioManager = (AudioManager)this.getSystemService(Context.AUDIO_SERVICE);
//         audioManager.setMode(AudioManager.MODE_IN_CALL);
//         Log.e("SipService", "onCreate ----------> AudioManager.setMode(AudioManager.MODE_IN_CALL)");
//         SystemUtil.setMicrophoneMute(false);
//         SystemUtil.getSpeakerphoneVolume();
    }



TimerTask task=new TimerTask() {

@Override
public void run() {
// TODO Auto-generated method stub
Message message=new Message();
message.what=1;
SipService.handler.sendMessage(message);
}
};



    @Override
    public void onDestroy()
    {
        super.onDestroy();
        Log.e("sipService", "------------->service---onDestroy!!!");
        //releaseWakeLock();
//         audioManager.setMode(AudioManager.MODE_NORMAL);
//         Log.e("SipService", "onStop ----------> AudioManager.setMode(AudioManager.MODE_NORMAL)");
    }

    @Override
    public void onStart(Intent intent, int startId)
    {
        super.onStart(intent, startId);
    }
   
      
   
   
    //释放唤醒锁
    public static void releaseWakeLock()
    {
        if (mWakeLock != null && mWakeLock.isHeld())
        {
            Log.i("", "release wake lock");
            mWakeLock.release();
            mWakeLock = null;          
        }
    }
   
   

   
    //判断 应用是否运行在前端
    private boolean isAppOnForeground() {  
        // Returns a list of application processes that are running on the device  
        List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();  
        if (appProcesses == null) return false;  
        for (RunningAppProcessInfo appProcess : appProcesses) {  
            if (appProcess.processName.equals(packageName)  
                    && appProcess.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {  
                return true;  
            }  
        }  
        return false;  
    }


@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
   
private void acceptHandler(){
  Handler accHandler= new Handler()
    {
        @Override
        public void handleMessage(Message msg)
        {
            super.handleMessage(msg);
            switch (msg.what)
            {
            
                case 1:
                {
                activityManager = (ActivityManager)SipService.this.getSystemService(Context.ACTIVITY_SERVICE);  
                packageName =SipService.this.getPackageName();
                   
                //应用是否运行在前端
                    isOnForeground=isAppOnForeground();
                        Log.e("SipService", "isOnForeground="+isOnForeground);
                       
                        //如果在前台运行
                        if(!isOnForeground)
                        {
                        Bundle bundle = new Bundle();
                        Intent intent = new Intent();
                        intent.putExtras(bundle);
                        //intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        intent.addCategory(Intent.CATEGORY_LAUNCHER);
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED); 
                        intent.setClass(getApplicationContext(),SecondActivity.class);
                        startActivity(intent);
                    }
                    break;
                }
            }
        }
    };
   
    SipService.handler=accHandler;
}
   

   
   
}



============
public class SipServiceManager extends BroadcastReceiver{

@Override
public void onReceive(Context arg0, Intent arg1) {
Log.e("","-------BroadcastReceiver--> " + arg1.getAction());

//开机
  if(arg1.getAction().toString().equals(Intent.ACTION_BOOT_COMPLETED)){
  arg0.startService(new Intent("cn.zte.sip.SERVICE"));
  }
//关机 
  else if(arg1.getAction().toString().equals(Intent.ACTION_SHUTDOWN)){
  arg0.stopService(new Intent("cn.zte.sip.SERVICE"));
  }
}
}



============
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    >  
    <Button  
        android:text="启动Service" 
        android:id="@+id/startButton" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
    />  
       
   
      <Button  
        android:text="转向按钮" 
        android:id="@+id/redirectId" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
      />
     
        
</LinearLayout> 


==================
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    >  
   
   
      <Button  
        android:text="转向Main界面" 
        android:id="@+id/redirectId2" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
      />
     
     
      <Button  
        android:text="关闭本界面" 
        android:id="@+id/closeId" 
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
      />
        
</LinearLayout> 

======

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.test.android"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
       
        <service android:name="com.test.android.SipService"> 
        <intent-filter>
            <action android:name="com.test.android.SERVICE" />       
        </intent-filter>
    </service>
    
    <receiver android:name="com.test.android.SipServiceManager" >
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="android.intent.action.ACTION_SHUTDOWN" />
        </intent-filter>
    </receiver>
   
        <activity android:name=".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>
         <activity android:name=".SecondActivity" android:screenOrientation="landscape" />

    </application>


</manifest>