Java 如何从非活动类中删除FusedlocationProviderClient位置更新

我正在尝试编写一个实用程序类来包装Google Play Services FusedLocationProviderClient API和位置权限请求，因为每次我想向应用程序添加位置功能时，我都厌倦了编写所有的样板文件。但我遇到的问题是，一旦启动位置更新，我就无法删除它们。下面是我的实用程序类的相关部分：

public class UserLocationUtility extends LocationCallback
{
    // Hold a WeakReference to the host activity (allows it to be garbage-collected to prevent possible memory leak)
    private final WeakReference<Activity> weakActivity;
    // Debug tag
    private static final String TAG = "UserLocationUtility";


    public static class RequestCodes
    {
        static final int CURRENT_LOCATION_ONE_TIME = 0;
        static final int CURRENT_LOCATION_UPDATES = 1;
        static final int LAST_KNOWN_LOCATION = 2;
        static final int SMART_LOCATION = 3;
    }


    private FusedLocationProviderClient mLocationClient;
    private Context mContext;
    private LocationRequest mLocationRequest;


    /* Constructor */
    UserLocationUtility(Activity activity){
        // assign the activity to the weak reference
        this.weakActivity = new WeakReference<>(activity);

        // Hold a reference to the Application Context
        this.mContext = activity.getApplicationContext();

        // Instantiate our location client
        this.mLocationClient = LocationServices.getFusedLocationProviderClient(mContext);

        // Set up the default LocationRequest parameters
        this.mLocationRequest = new LocationRequest();
        setLocationRequestParams(2000, 500, LocationRequest.PRIORITY_HIGH_ACCURACY);
                                // Sets up the LocationRequest with an update interval of 30 seconds, a fastest
                                // update interval cap of 5 seconds and using balanced power accuracy priority.
    } /* Note: values for testing only. Will be dialed back for better power management when testing complete */


    /* Stripped out other methods for brevity */


    @SuppressLint("MissingPermission")
    public void getCurrentLocationOneTime(final UserLocationCallback callback){

        mLocationClient.requestLocationUpdates(mLocationRequest, new LocationCallback()
        {
            @Override
            public void onLocationResult(LocationResult locationResult){
                if (locationResult == null){
                    callback.onFailedRequest("getCurrentLocationOneTime(): Request failed: returned null");
                    return;
                }

                callback.onLocationResult(locationResult.getLastLocation());
                stopLocationUpdates(); /* Stopping location updates here just for testing (NOT WORKING!!) */ 

            }
        }, null);

    }


    public void stopLocationUpdates(){

        mLocationClient.removeLocationUpdates(new LocationCallback(){});
        Log.i(TAG, "stopLocationUpdates(): Location updates removed");

    }

}

下面是日志中的一个示例：

I/MainActivity: getLocationUpdates result: Location[fused 34.421998,-125.084000 hAcc=731 et=+2h10m52s694ms vAcc=??? sAcc=??? bAcc=???]
I/UserLocationUtility: stopLocationUpdates(): Location updates removed
I/MainActivity: getLocationUpdates result: Location[fused 34.421998,-125.084000 hAcc=739 et=+2h10m57s697ms vAcc=??? sAcc=??? bAcc=???]
I/UserLocationUtility: stopLocationUpdates(): Location updates removed
I/MainActivity: getLocationUpdates result: Location[fused 34.421998,-125.084000 hAcc=763 et=+2h11m5s723ms vAcc=??? sAcc=??? bAcc=???]
I/UserLocationUtility: stopLocationUpdates(): Location updates removed
etc...

如您所见，我正确地接收到位置更新，但对stopLocationUpdates（）的调用不起作用。我觉得这与我正在将一个新的LocationCallback传递给removeUpdates（）方法有关，但我不确定替代方法是什么，甚至不确定是否有替代方法。这是一个非活动类，我不能在onCreate（）中将LocationCallback初始化为成员，然后根据需要传递它。谷歌在这方面的文档帮不了什么忙。无论是因为我缺乏必要的理解来解读它们，还是因为它们不是很好，我都不知道，但不管怎样，我都被难住了，四处搜索，似乎在别处找不到现有的答案。

---

谢谢。

将我的解决方案作为答案发布，以防对其他人有所帮助

我将LocationCallback声明为成员变量，然后在每个需要它的方法中初始化（或重新初始化）它，从而使它工作起来

public void getCurrentLocationUpdates(final UserLocationCallback callback){
        if (mIsReceivingUpdates){
            callback.onFailedRequest("Device is already receiving updates");
            return;
        }

        // Set up the LocationCallback for the request
        mLocationCallback = new LocationCallback()
        {
            @Override
            public void onLocationResult(LocationResult locationResult){
                if (locationResult != null){
                    callback.onLocationResult(locationResult.getLastLocation());
                } else {
                    callback.onFailedRequest("Location request returned null");
                }
            }
        };

        // Start the request
        mLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, null);
        // Update the request state flag
        mIsReceivingUpdates = true;
    }

我在方法开始时检查是否已经收到位置更新，如果已经收到，请提前离开。这可以防止启动重复（因此无法阻止）的位置更新请求

调用stopLocationUpdates（以下供参考）方法现在可以正常工作

public void stopLocationUpdates(){

    mLocationClient.removeLocationUpdates(mLocationCallback);
    mIsReceivingUpdates = false;
    Log.i(TAG, "Location updates removed");

}

public void stopLocationUpdates(){

    mLocationClient.removeLocationUpdates(mLocationCallback);
    mIsReceivingUpdates = false;
    Log.i(TAG, "Location updates removed");

}