android - 无法解绑服务

Question

我启动我的应用程序，开始被调用，执行绑定(bind)服务并触发 onServiceConnected。一切正常。

但是……

当我按回键时，将调用 onStop，我的绑定(bind)变量如预期的那样为真，但永远不会调用 onServiceDisconnected...

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}

@Override
protected void onStart()
{
    Log.e("START", "START");

    super.onStart();

    // Bind to LocalService
    Intent intent = new Intent(this, LocationService.class);
    bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}

@Override
protected void onStop()
{
    Log.e("STOP", "STOP");

    super.onStop();

    // Unbind from the service
    if (mBound)
    {
        this.unbindService(mConnection);
        mBound = false;
    }
}

/** Defines callbacks for service binding, passed to bindService() */
private ServiceConnection mConnection = new ServiceConnection()
{
    @Override
    public void onServiceConnected(ComponentName className, IBinder service)
    {
        Log.e("ON SERVICE START", "ON SERVICE START");

        // We've bound to LocalService, cast the IBinder and get LocalService instance
        LocationService.LocationBinder binder = (LocationService.LocationBinder) service;
        mService = binder.getService();
        mBound = true;
    }

    @Override
    public void onServiceDisconnected(ComponentName arg0)
    {
        Log.e("ON SERVICE END", "ON SERVICE END");

        mBound = false;
    }
};

还有我的服务

// Binder given to clients
private final IBinder mBinder = new LocationBinder();

/**
 * Class used for the client Binder.  Because we know this service always
 * runs in the same process as its clients, we don't need to deal with IPC.
 */
public class LocationBinder extends Binder
{
    public LocationService getService()
    {
        // Return this instance of LocationService so clients can call public methods
        return LocationService.this;
    }
}

@Override
public IBinder onBind(final Intent intent)
{
    Log.e("onBind", "onBind onBind onBind onBind onBind onBind");

    return mBinder;
}

/** method for clients */
public int getRandomNumber()
{
    return new Random().nextInt(100);
}

Answer 1

每次调用bindService()应与对 unbindService() 的调用配对.绑定(bind)是否有效实际上并不重要。重点是让 Android 知道您不再希望连接处于 Activity 状态。 Android 将负责确定连接当前是否已绑定(bind)和激活并采取适当操作的细节。

最重要的是，您不应在此处有条件地调用 unbindService()。只需始终在 onStop() 中使用与在 onStart() 中调用 bindService() 时使用的相同的 ServiceConnection 调用它。