Question

我尝试在Android上使用新的简化位置API（在GPS 11.0中引入）。我写了一个实现位置API的服务。但它只触发并发送位置几秒钟（仅2次）。

public class LocationService extends Service {
public static final String TAG = makeLogTag("LocationService");

private static final float LOCATION_TRACKING_MIN_DISTANCE = 15f;
private static final float ACCEPTED_ACCURACY = 50f;

private final IBinder mBinder = new LocalBinder();

// fused location api
private FusedLocationProviderClient mFusedLocationClient;
private LocationRequest mLocationRequest;
private LocationCallback mLocationCallback;

@Override
public void onCreate() {
    super.onCreate();
    Log.i(TAG, "onCreate");
    mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
    createLocationCallback();
    createLocationRequest();
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    Log.i(TAG, "onStartCommand");
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        stopSelf();
        return START_NOT_STICKY;
    }

    getLastKnownLocation();
    startPeriodicLocationUpdate();

    return START_STICKY;
}

@Override
public void onDestroy() {
    super.onDestroy();
    stopPeriodicLocationUpdate();
    Log.i(TAG, "onDestroy - Estou sendo destruido ");
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
    return mBinder;
}

private void getLastKnownLocation() {
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        return;
    }
    mFusedLocationClient.getLastLocation()
            .addOnCompleteListener(task -> {
                if (task.isSuccessful() && task.getResult() != null) {
                    Location lastLocation = task.getResult();
                    storeLocation(lastLocation);
                }
            });
}

private void createLocationRequest() {
    mLocationRequest = new LocationRequest()
            .setInterval(TimeUnit.SECONDS.toMillis(Params.getAgentLocationTrackingUpdateInterval()))
            .setFastestInterval(TimeUnit.SECONDS.toMillis(Params.getAgentLocationTrackingUpdateInterval()))
            .setExpirationDuration(TimeUnit.SECONDS.toMillis(10))
            .setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
}

private void createLocationCallback() {
    mLocationCallback = new LocationCallback() {
        @Override
        public void onLocationResult(LocationResult locationResult) {
            super.onLocationResult(locationResult);
            Location location = locationResult.getLastLocation();
            if (location != null) {
                storeLocation(location);
            }

            Log.i(TAG, "locationResult start");
            for (Location location1 : locationResult.getLocations()) {
                Log.i(TAG, "locationResult location " + location1.getLatitude() + " " + location1.getLongitude() + " " + location1.getAccuracy() + " " + location1.getProvider());
            }
            Log.i(TAG, "locationResult stop");
        }
    };
}

private void startPeriodicLocationUpdate() {
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        return;
    }

    Log.i(TAG, "periodic update");
    mFusedLocationClient.requestLocationUpdates(mLocationRequest, mLocationCallback, Looper.myLooper());
}

private void stopPeriodicLocationUpdate() {
    mFusedLocationClient.removeLocationUpdates(mLocationCallback)
            .addOnCompleteListener(task -> LOGI(TAG, "removed location updates!"));
}

private void storeLocation(Location location) {
    Log.i(TAG, "periodic location " + location.getLatitude() + " " + location.getLongitude() + " " + location.getAccuracy() + " " + location.getProvider());
    if (location.getAccuracy() <= ACCEPTED_ACCURACY) {
        Log.i(TAG, "storeLocation: " + "saved!");
        AgentLocationVo agentLocation = new AgentLocationVo();
        agentLocation.setDate(DateHelper.getDate(location.getTime()));
        agentLocation.setLatitude(location.getLatitude());
        agentLocation.setLongitude(location.getLongitude());
        agentLocation.setAccuracy(location.getAccuracy());
        agentLocation.setSyncState(SyncState.NOTUPLOADED);
        if (!AgentLocationDao.isAgentLocationExist(agentLocation))
            AgentLocationDao.insert(agentLocation);
    }
}

@Override
public void onTaskRemoved(Intent rootIntent) {
    Log.i(TAG, "onTaskRemoved: ");
    stopSelf();
    JobDispatcher.stopSendLocationJob(getApplicationContext()); // TODO: 04/07/17 not the best place for it
}

public static void start(Context context) {
    context.startService(new Intent(context, LocationService.class));
}

public static void stop(Context context) {
    context.stopService(new Intent(context, LocationService.class));
}

/**
 * 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 LocalBinder extends Binder {
    public LocationService getService() {
        // Return this instance of LocationService so clients can call public methods
        return LocationService.this;
    }
}

}

以下是我用于创建服务的资源： https://android-developers.googleblog.com/2017/06/reduce-friction-with-new-location-apis.html

https://github.com/googlesamples/android-play-location/blob/master/LocationUpdates/app/src/main/java/com/google/android/gms/location/sample/locationupdates/MainActivity.java

https://blog.stylingandroid.com/locationservices/

我甚至尝试使用Pending intent的方法版本，但得到相同的结果。即使app在前台。

Answer 1

原因是这一行

  .setExpirationDuration(TimeUnit.SECONDS.toMillis(10))

FusedLocationProviderClient不发送位置更新

1 个答案: