Android::Service OnDestroy 调用得很晚

Question

我有线程服务，从 Activity 中我调用启动服务(从 Activity::onDestroy())并停止服务(activity::onCreate())。

StopService() 立即返回，但我的 Service::OnDestroy 调用了很多次，很晚了，为什么？如何让 Service::OnDestroy 在调用 StopService() 时立即调用。

Activity 类别

MyActivity::OnDestroy()
{
  System.out.println("MyActivity-OnDestroy Start");
  // we are leaving activity so start service
  Intent svcIntent = new Intent(this,MyService.class);
  svcIntent.putExtra("SomeData", m_iData);
  startService(svcIntent);
  System.out.println("MyActivity-OnDestroy, startservice called");
  ..
  ..
  System.out.println("MyActivity-OnDestroy, End");
}
MyActivity::OnCreate()
{
  System.out.println("MyActivity-onCreate Start");
  // if service running stop it.
  if (m_bCalledFromNotification)
  {
   System.out.println("Stopping Service");
   boolean b = stopService(new Intent(this,AudioService.class));
   System.out.println("Stopping Service, Status="+b);
  }
  System.out.println("MyActivity-onCreate End");      
}

服务等级

@Override
public IBinder onBind(Intent intent) 
{
    return null;
}

// When service is created
@Override
public void onCreate() 
{
    // initialize service data
    System.out.println("MyService Created");    
}

@Override
public void onDestroy() 
{
    System.out.println("In MyService::onDestroy");
    m_UIUpdater.interrupt();
    System.out.println("In MyService::onDestroy, updater thread interrupted");
    ..
    System.out.println("My Service Stopped");
}

// This is the old onStart method that will be called on the pre-2.0
// platform.  On 2.0 or later we override onStartCommand() so this
// method will not be called.
@Override
public void onStart(Intent intent, int startId) 
{
    StartupHandler(intent,startId);
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) 
{
    StartupHandler(intent,startId);
    // We want this service to continue running until it is explicitly
    // stopped, so return sticky.
    return START_STICKY;
}

public void StartupHandler(Intent intent, int startid) 
{
    // send notification 
    System.out.println("In MyService::StartupHandler, Sending notification");

    // start thread 
    m_UIUpdater = new Thread(new Runnable() 
        {
        public void run() 
        {
            System.out.println("In MyService::Thread::Run");
            while (!Thread.interrupted())
            {
                // check update
                System.out.println("In MyService::Thread::Run::got update and loop for next update");
            }
        }
    }
}

现在这是 logcat 的输出，显示了 MyService::OnDestroy 调用的时间。

12-17 09:25:44.462: INFO/System.out(314): MyActivity-OnDestroy Start
..
12-17 09:25:44.493: INFO/System.out(314): MyActivity-OnDestroy, startservice called
..
12-17 09:25:51.102: INFO/System.out(314): MyActivity-OnDestroy, End 
12-17 09:25:51.153: INFO/System.out(314): MyService Created
12-17 09:25:51.172: INFO/System.out(314): In MyService::StartupHandler, Sending notification
12-17 09:25:51.273: INFO/System.out(314): In MyService::Thread::Run
12-17 09:25:51.302: INFO/System.out(314): In MyService::Thread::Run::got update and loop for next update
..
..
..
12-17 09:25:59.903: INFO/System.out(314): MyActivity-onCreate Start
..
12-17 09:26:00.461: INFO/System.out(314): Stopping Service
12-17 09:26:00.471: INFO/System.out(314): Stopping Service, Status=true
12-17 09:26:01.363: INFO/System.out(314): MyActivity-onCreate End
12-17 09:26:01.421: INFO/System.out(314): In MyService::OnDestroy
12-17 09:26:01.421: INFO/System.out(314): In MyService::OnDestroy, updater interrupted
12-17 09:26:01.591: INFO/System.out(314): My Service Stopped

我是否正确实现了服务代码？

我如何等待服务优雅地销毁，以便我可以在服务销毁后执行剩余的进程，例如读取数据服务已停止。

谢谢

Answer 1

在我看来，当GC回收服务时，会调用onDestroy。

在 onStop 中尝试 m_UIUpdater.interrupt();。