Question

我正在开发一个Android应用程序，其中我使用融合API位置更新和待定意图。这是我到目前为止所取得的成就。我能够在前台和后台状态中监听应用程序的位置更新。我能够从前景状态停止位置更新，并且还可以从后台恢复应用程序到前台。但在应用程序重启状态的情况下，我无法停止位置更新，因为一旦我从后台杀死应用程序然后它丢失GoogleApiClient对象，我无法删除更新。我按照以下方式尝试了它：

private GoogleApiClient mGoogleApiClient;
private LocationRequest mLocationRequest;
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my_location);

    updateStatusForLocationListening();
    initUi();
    // if condition to check whether already started listening for updates.
    if (!isLocationUpdatesOn) {
        initLocationListeningProcess();
    }
    registerLocationListener();
}

private void initLocationListeningProcess() {

    createLocationPendingIntent();
    initLocationListener();

    createLocationRequest();
    buildLocationSettingsRequest();
    checkForLocationPermission();
}

private void createLocationPendingIntent() {
    Intent intervalIntent = new Intent(this, LocationPendingIntentService.class);
    locationPendingIntent = PendingIntent.getService(this, 1, intervalIntent, PendingIntent.FLAG_CANCEL_CURRENT);
}

private void initLocationListener() {
    buildGoogleApiClient();
}
synchronized void buildGoogleApiClient() {
    mGoogleApiClient = new GoogleApiClient.Builder(this)
        .addConnectionCallbacks(this)
        .addOnConnectionFailedListener(this)
        .addApi(LocationServices.API)
        .build();


}

private void createLocationRequest() {
    mLocationRequest = LocationRequest.create();
    mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
    mLocationRequest.setInterval(100); // Update location every second
}
protected void buildLocationSettingsRequest() {
    LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder();
    builder.addLocationRequest(mLocationRequest);
    mLocationSettingsRequest = builder.build();
}
protected void checkLocationSettings() {
    PendingResult < LocationSettingsResult > result =
        LocationServices.SettingsApi.checkLocationSettings(
            mGoogleApiClient,
            mLocationSettingsRequest
        );
    result.setResultCallback(this);
}

private void processStopLocation() {
    // user clicks on stop button.
    // Here it is loosing mGoogleApiClient if user kills the application from the background. It keeps listening for updates.
    // But when try to stop it, its giving Null pointer exception.
    LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, locationPendingIntent);

    unregisterLocationListener();
    mGoogleApiClient.disconnect();
}
private void processStartLocation() {
    // user click on start button.
    mGoogleApiClient.connect();
}

@Override
public void onConnected(Bundle bundle) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, locationPendingIntent);

        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        if (mLastLocation != null) {
            updateUI();
        }
    }
    ///////////////////////////////////////////////////////////////////////////////////////////////////////
public class LocationPendingIntentService extends IntentService {

    public LocationPendingIntentService(String name) {
        super(name);
    }

    public LocationPendingIntentService() {
        super("");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        Location location = intent.getParcelableExtra(FusedLocationProviderApi.KEY_LOCATION_CHANGED);
        if (location != null) {
            Log.i("***********", "Lcation Received ");
            Intent locationIntent = new Intent("LOCATION_UPDATES_AVAILABLE");
            locationIntent.putExtra("location", location);
            LocalBroadcastManager.getInstance(this).sendBroadcast(locationIntent);
        }
    }
}

所以在我的情况下，我从后台杀了应用程序并再次启动它。它显示位置更新。我试图阻止它。它为我提供了mGoogleApiClient对象的空指针。我尝试为GoogleApiClient创建新对象。但是一旦我创建了新对象，它就会停止以前开始的位置更新。这意味着我需要开始新的位置更新。有没有办法存储此对象或获取mGoogleApiClient的当前活动对象。所以我可以阻止它。是否有任何错误的实施我正在追踪或其他我错过的东西？需要一些帮助。谢谢。

Handeling融合位置更新与pendingIntent

0 个答案: