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我创建了简单的类来使用谷歌的 FusedLocationProviderClient 获取更新的位置。IE：

public class LocationProvider extends LocationCallback {...
  private static FusedLocationProviderClient mFusedLocationClient;
  private LocationRequest mLocationRequest;

    if(mFusedLocationClient == null) {
        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(mContext);
        mFusedLocationClient.requestLocationUpdates(mLocationRequest,
                locationCallback,
                null /* Looper */);
    }..}

现在，我使用 AlarmManager 在后台获取更新位置。但是，我无法删除位置更新：

public void stopLocationRequest(){
    if(mFusedLocationClient != null){
        mFusedLocationClient.removeLocationUpdates(locationCallback);
        mFusedLocationClient = null;
        mLocationRequest = null;
    }
}
private LocationCallback locationCallback = new LocationCallback(){
    @Override
    public void onLocationResult(LocationResult locationResult) {
        super.onLocationResult(locationResult);
        Location location = locationResult.getLastLocation();
        //Code of Generate Notification
    }};

现在，我从 BroadcastReceiver 调用上面的stopLocationRequest函数，该函数在 Notification.Builder 中注册为 addAction()。但我收到错误：

    A/UnregisterListenerTask: Received call to unregister a listener without a matching registration call.
java.lang.Exception
    at com.google.android.gms.internal.zzbar.zzb(Unknown Source)
    at com.google.android.gms.internal.zzban.zza(Unknown Source)
    at com.google.android.gms.internal.zzbdd.zzb(Unknown Source)
    at com.google.android.gms.internal.zzbdd.zza(Unknown Source)
    at com.google.android.gms.internal.zzbdb.handleMessage(Unknown Source)
    at android.os.Handler.dispatchMessage(Handler.java:98)
    at android.os.Looper.loop(Looper.java:135)
    at android.os.HandlerThread.run(HandlerThread.java:61)

而且，我仍然得到更新的位置。这不是删除位置更新。请给我关于这个问题的任何建议。

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