在Android 7.0+中，当屏幕关闭时，前台服务无法接收位置更新

Question

我试图创建一个Android应用程序，不断记录设备位置数据实时，而设备屏幕关闭。我的代码在Android6.0和更早的版本中工作正常，但似乎Android7.0+破坏了我的应用程序。

我已经实现了一个Android前台服务，它使用wakelock并订阅了Google FusedLocation API。一旦屏幕关闭，onlocationchanged回调就永远不会触发。

public class ForegroundLocationService extends Service implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener {

    private static final String TAG = ForegroundLocationService.class.getSimpleName();

    // the notification id for the foreground notification
    public static final int GPS_NOTIFICATION = 1;

    // the interval in seconds that gps updates are requested
    private static final int UPDATE_INTERVAL_IN_SECONDS = 15;

    // is this service currently running in the foreground?
    private boolean isForeground = false;

    // the google api client
    private GoogleApiClient googleApiClient;

    // the wakelock used to keep the app alive while the screen is off
    private PowerManager.WakeLock wakeLock;

    @Override
    public void onCreate() {
        super.onCreate();

        // create google api client
        googleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();

        // get a wakelock from the power manager
        final PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
        wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        if (!isForeground) {

            Log.v(TAG, "Starting the " + this.getClass().getSimpleName());

            startForeground(ForegroundLocationService.GPS_NOTIFICATION,
                    notifyUserThatLocationServiceStarted());
            isForeground = true;

            // connect to google api client
            googleApiClient.connect();

            // acquire wakelock
            wakeLock.acquire();
        }

        return START_REDELIVER_INTENT;
    }

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

    @Override
    public void onDestroy() {

        Log.v(TAG, "Stopping the " + this.getClass().getSimpleName());

        stopForeground(true);
        isForeground = false;

        // disconnect from google api client
        googleApiClient.disconnect();

        // release wakelock if it is held
        if (null != wakeLock && wakeLock.isHeld()) {
            wakeLock.release();
        }

        super.onDestroy();
    }

    private LocationRequest getLocationRequest() {

        LocationRequest locationRequest = LocationRequest.create();

        // we always want the highest accuracy
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);

        // we want to make sure that we get an updated location at the specified interval
        locationRequest.setInterval(TimeUnit.SECONDS.toMillis(0));

        // this sets the fastest interval that the app can receive updates from other apps accessing
        // the location service. for example, if Google Maps is running in the background
        // we can update our location from what it sees every five seconds
        locationRequest.setFastestInterval(TimeUnit.SECONDS.toMillis(0));
        locationRequest.setMaxWaitTime(TimeUnit.SECONDS.toMillis(UPDATE_INTERVAL_IN_SECONDS));

        return locationRequest;
    }

    private Notification notifyUserThatLocationServiceStarted() {

        // pop up a notification that the location service is running
        Intent notificationIntent = new Intent(this, NotificationActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
                notificationIntent, PendingIntent.FLAG_CANCEL_CURRENT);

        final Notification.Builder builder = new Notification.Builder(this)
                .setSmallIcon(R.drawable.ic_launcher_foreground)
                .setContentTitle(getString(R.string.foreground_location_service))
                .setContentText(getString(R.string.service_is_running))
                .setContentIntent(pendingIntent)
                .setWhen(System.currentTimeMillis());

        final Notification notification;
        if (Build.VERSION.SDK_INT < 16) {
            notification = builder.getNotification();
        } else {
            notification = builder.build();
        }

        return notification;
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {

        try {

            // request location updates from the fused location provider
            LocationServices.FusedLocationApi.requestLocationUpdates(
                    googleApiClient, getLocationRequest(), this);

        } catch (SecurityException securityException) {
            Log.e(TAG, "Exception while requesting location updates", securityException);
        }
    }

    @Override
    public void onConnectionSuspended(int i) {
        Log.i(TAG, "Google API Client suspended.");
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        Log.e(TAG, "Failed to connect to Google API Client.");
    }

    @Override
    public void onLocationChanged(Location location) {
        Log.e(TAG, "onLocationChanged: " + location.toString());
    }
}

Android O的代码示例

让应用程序一直在Android上后台运行

Android，在屏幕关闭时获取位置

编辑2018.01.30:我还尝试在ForegroundLocationService自己的进程中运行该服务：

<service
    android:name="foregroundlocation.stackoverflowexample.com.foregroundlocation.ForegroundLocationService"
    android:enabled="true"
    android:stopWithTask="false"
    android:process=":ForegroundLocationService"
    android:exported="false" >
</service>

除了更新我的代码以使用FusedLocationProviderClient，仍然没有运气。

Answer 1

我在过去的一周里一直试图在前台提供定位服务。最后通过在清单中包括这一点来让它工作。

android:foregroundServiceType="location"

希望这能帮助到以后的人！