GoogleApiClient 问题:GoogleApiClient 尚未连接

GoogleApiClient issue: GoogleApiClient is not connected yet

在此class,:

public class Presence implements ConnectionCallbacks,
                                 OnConnectionFailedListener, LocationListener

我有以下构造函数:

    private Presence(Context context)
    {
        this.context = context;

        gApiClient = new GoogleApiClient.Builder(context, this, this)
                .addApi(LocationServices.API)
                .build();
        if (!gApiClient.isConnecting() && !gApiClient.isConnected())
        {
            gApiClient.connect();
        }
    } // of constructor()

我用它来 return 一个 Singleton 实例:

public static synchronized Presence getInstance(Context context)
{
    if (presenceSingleton == null)
        presenceSingleton = new Presence(context);

    return presenceSingleton;
}

onConnected() 看起来像这样:

@Override
public void onConnected(Bundle connectionHint)
{
    Log.e(LOG_TAG, "In onConnected(), gApiClient.isConnected(): " + 
          gApiClient.isConnected());
    createLocationRequest();
    getLocation();
    getSubLocality();
} // of onConnected()

根据用户可以在应用程序中进行的设置,我调用以下方法将应用程序置于所谓的自动驾驶模式,它开始跟踪用户的位置:

public void startLocationUpdates()
{
    // Prints 'false' in the logs:
    Log.e(LOG_TAG, "In startLocationUpdates(), gApiClient.isConnected(): " + gApiClient.isConnected());
    Intent locationChangeIntent = new Intent(context, LocationTracker.class);
    pendingIntent = PendingIntent.getService(context, 188, locationChangeIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    // Crash points to the following line: 
    LocationServices.FusedLocationApi.requestLocationUpdates(gApiClient, locationRequest, pendingIntent);
} // of startLocationUpdates()

在主体 activity 中,我在 onCreate() 中创建了上述 class 的实例:

public class MainClass extends AppCompatActivity implements
                                OnSharedPreferenceChangeListener
{
    ....
    ....
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        getAppSettings();
        presence = Presence.getInstance(getApplicationContext());
        ....
        ....
        startApp();
        ....
    }

    private void startApp()
    {
         if (pref_autoPilot)
             presence.startLocationUpdates();
    }

    ....
    ....
    ....
} // of class MainClass

当用户设置自动驾驶首选项时,应用程序崩溃并出现以下异常:

java.lang.IllegalStateException: GoogleApiClient is not connected yet.

在上述方法中指示的行startLocationUpdates()

我看了很多答案,但无法找到解决这个问题的办法。你能指出我做错了什么吗? Presence class 是否应该在 AppCompatActivityFragmentActivity 或类似的位置,并且不能像这里那样独立?请帮我解决这个烦人的问题。

非常感谢!

遵循 Android Developers 中的简单指南。 我想你错过了以下部分:

protected void onStart() {
    mGoogleApiClient.connect();
    super.onStart();
}

protected void onStop() {
    mGoogleApiClient.disconnect();
    super.onStop();
}

在你的MainActivity中你需要在需要时调用connectdisconnect(换句话说,当所谓的自动驾驶模式 开启)

You should instantiate a client object in your Activity's onCreate(Bundle) method and then call connect() in onStart() and disconnect() in onStop(), regardless of the state.

您应该从 onConnected() 方法中调用 presence.startLocationUpdates(); 此方法。如果您的位置为空,请在调用前检查条件。在 GoogleApiClient 发生连接之前,您无法更新位置。

为了完整起见,@Kedi...

Can you please point out what I am doing wrong?

gApiClient.connect() 没有在正确的地方被调用。请查看已接受的答案。

Is it that the Presence class should be in an AppCompatActivity or FragmentActivity or similar, and cannot be independent like in here?

可以独立class

感谢大家的热心帮助。