Comment redémarrer le service après la suppression de l'application à partir de tâches récentes

Question

J'ai créé un service pour récupérer l'emplacement actuel du périphérique à intervalles réguliers. Je souhaite que le service s'exécute en arrière-plan même si l'application est supprimée des applications récemment ouvertes. Actuellement, le service fonctionne en arrière-plan uniquement jusqu'à ce que l'application soit présente dans les applications récemment ouvertes, mais s'arrête immédiatement lorsque l'application est supprimée (ou supprimée d'une autre manière) ..__ incapable de résoudre cela. S'il vous plaît aider. Voici mon code pour le service.

package com.packr.services;

import Android.app.AlarmManager;
import Android.app.PendingIntent;
import Android.app.Service;
import Android.content.Context;
import Android.content.Intent;
import Android.content.pm.ServiceInfo;
import Android.location.Location;
import Android.os.Bundle;
import Android.os.IBinder;
import Android.os.SystemClock;
import Android.support.annotation.Nullable;
import Android.util.Log;
import Android.widget.Toast;

import com.google.Android.gms.common.ConnectionResult;
import com.google.Android.gms.common.api.GoogleApiClient;
import com.google.Android.gms.location.LocationListener;
import com.google.Android.gms.location.LocationRequest;
import com.google.Android.gms.location.LocationServices;

import Java.text.DateFormat;
import Java.util.Date;

/**
 * Created by Arindam on 11-Dec-15.
 */
public class LocationService extends Service implements
        GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
    protected static final String TAG = "packrMATE";
    /**
     * The desired interval for location updates. Inexact. Updates may be more or less frequent.
     */
    public static final long UPDATE_INTERVAL_IN_MILLISECONDS = 10000;

    /**
     * The fastest rate for active location updates. Exact. Updates will never be more frequent
     * than this value.
     */
    public static final long FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS =
            UPDATE_INTERVAL_IN_MILLISECONDS / 2;

    // Keys for storing activity state in the Bundle.
    protected final static String REQUESTING_LOCATION_UPDATES_KEY = "requesting-location-updates-key";
    protected final static String LOCATION_KEY = "location-key";
    protected final static String LAST_UPDATED_TIME_STRING_KEY = "last-updated-time-string-key";

    /**
     * Provides the entry point to Google Play services.
     */
    protected GoogleApiClient mGoogleApiClient;

    /**
     * Stores parameters for requests to the FusedLocationProviderApi.
     */
    protected LocationRequest mLocationRequest;

    /**
     * Represents a geographical location.
     */
    protected Location mCurrentLocation;

    /**
     * Tracks the status of the location updates request. Value changes when the user presses the
     * Start Updates and Stop Updates buttons.
     */
    protected Boolean mRequestingLocationUpdates;

    /**
     * Time when the location was updated represented as a String.
     */
    protected String mLastUpdateTime;

    @Override
    public void onCreate() {
        Log.d(TAG,"Service started");
        super.onCreate();
        mRequestingLocationUpdates = false;
        mLastUpdateTime = "";

        // Kick off the process of building a GoogleApiClient and requesting the LocationServices
        // API.
        buildGoogleApiClient();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d(TAG,"Service fucking started");
        mGoogleApiClient.connect();
        if (mGoogleApiClient.isConnected()) {
            startLocationUpdates();
        }
        return Service.START_STICKY;

    }

    @Override
    public void onDestroy() {
        mGoogleApiClient.disconnect();
        super.onDestroy();
    }

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

    @Override
    public void onConnected(Bundle bundle) {
        Log.i(TAG, "Connected to GoogleApiClient");

        // If the initial location was never previously requested, we use
        // FusedLocationApi.getLastLocation() to get it. If it was previously requested, we store
        // its value in the Bundle and check for it in onCreate(). We
        // do not request it again unless the user specifically requests location updates by pressing
        // the Start Updates button.
        //
        // Because we cache the value of the initial location in the Bundle, it means that if the
        // user launches the activity,
        // moves to a new location, and then changes the device orientation, the original location
        // is displayed as the activity is re-created.
        if (mCurrentLocation == null) {
            mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
            mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());
            Toast.makeText(getApplicationContext(),"Hello Babe",Toast.LENGTH_SHORT).show();
        }

        // If the user presses the Start Updates button before GoogleApiClient connects, we set
        // mRequestingLocationUpdates to true (see startUpdatesButtonHandler()). Here, we check
        // the value of mRequestingLocationUpdates and if it is true, we start location updates.
            startLocationUpdates();
    }

    @Override
    public void onConnectionSuspended(int i) {
        // The connection to Google Play services was lost for some reason. We call connect() to
        // attempt to re-establish the connection.
        Log.i(TAG, "Connection suspended");
        mGoogleApiClient.connect();
    }

    @Override
    public void onLocationChanged(Location location) {
        mCurrentLocation = location;
        mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());
        Toast.makeText(this, String.valueOf(location.getLatitude() + " "+ String.valueOf(location.getLongitude())),
                Toast.LENGTH_SHORT).show();
        Log.e(TAG,"fuck man location found");
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        // Refer to the javadoc for ConnectionResult to see what error codes might be returned in
        // onConnectionFailed.
        Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = " + connectionResult.getErrorCode());
    }

    protected synchronized void buildGoogleApiClient() {
        Log.i(TAG, "Building GoogleApiClient");
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        createLocationRequest();

    }
    /**
     * Sets up the location request. Android has two location request settings:
     * {@code ACCESS_COARSE_LOCATION} and {@code ACCESS_FINE_LOCATION}. These settings control
     * the accuracy of the current location. This sample uses ACCESS_FINE_LOCATION, as defined in
     * the AndroidManifest.xml.
     * <p/>
     * When the ACCESS_FINE_LOCATION setting is specified, combined with a fast update
     * interval (5 seconds), the Fused Location Provider API returns location updates that are
     * accurate to within a few feet.
     * <p/>
     * These settings are appropriate for mapping applications that show real-time location
     * updates.
     */
    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();

        // Sets the desired interval for active location updates. This interval is
        // inexact. You may not receive updates at all if no location sources are available, or
        // you may receive them slower than requested. You may also receive updates faster than
        // requested if other applications are requesting location at a faster interval.
        mLocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);

        // Sets the fastest rate for active location updates. This interval is exact, and your
        // application will never receive updates faster than this value.
        mLocationRequest.setFastestInterval(FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS);

        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    }

    /**
     * Requests location updates from the FusedLocationApi.
     */
    protected void startLocationUpdates() {
        // The final argument to {@code requestLocationUpdates()} is a LocationListener
        // (http://developer.Android.com/reference/com/google/Android/gms/location/LocationListener.html).
        LocationServices.FusedLocationApi.requestLocationUpdates(
                mGoogleApiClient, mLocationRequest, this);
    }
    /**
     * Removes location updates from the FusedLocationApi.
     */
    protected void stopLocationUpdates() {
        // It is a good practice to remove location requests when the activity is in a paused or
        // stopped state. Doing so helps battery performance and is especially
        // recommended in applications that request frequent location updates.

        // The final argument to {@code requestLocationUpdates()} is a LocationListener
        // (http://developer.Android.com/reference/com/google/Android/gms/location/LocationListener.html).
        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
    }
    @Override
    public void onTaskRemoved(Intent rootIntent) {
        Log.e("FLAGX : ", ServiceInfo.FLAG_STOP_WITH_TASK + "");
        Intent restartServiceIntent = new Intent(getApplicationContext(),
                this.getClass());
        restartServiceIntent.setPackage(getPackageName());

        PendingIntent restartServicePendingIntent = PendingIntent.getService(
                getApplicationContext(), 1, restartServiceIntent,
                PendingIntent.FLAG_ONE_SHOT);
        AlarmManager alarmService = (AlarmManager) getApplicationContext()
                .getSystemService(Context.ALARM_SERVICE);
        alarmService.set(AlarmManager.ELAPSED_REALTIME,
                SystemClock.elapsedRealtime() + 1000,
                restartServicePendingIntent);

        super.onTaskRemoved(rootIntent);
    }
}

Answer 1

Remplacez onTaskRemoved () dans votre service et utilisez le gestionnaire d'alarmes pour redémarrer le service. Voici le code de notre application qui fait la même chose et fonctionne bien: 

@Override
public void onTaskRemoved(Intent rootIntent) {
    super.onTaskRemoved(rootIntent);

    Log.d(TAG, "TASK REMOVED");

    PendingIntent service = PendingIntent.getService(
            getApplicationContext(),
            1001,
            new Intent(getApplicationContext(), MyService.class),
            PendingIntent.FLAG_ONE_SHOT);

    AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
    alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, 1000, service);
}  

Comme vous pouvez souhaiter envoyer une position périodiquement, même dans le cas où le service est tué avec peu de mémoire (ou pour quelque raison que ce soit), je vous suggère de gérer l'exception uncaughtException pour la redémarrer au bout de N secondes. Voici ce que nous avons fait dans notre application qui fonctionne parfaitement: 

private Thread.UncaughtExceptionHandler defaultUEH;
private Thread.UncaughtExceptionHandler uncaughtExceptionHandler = new Thread.UncaughtExceptionHandler() {

    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        Log.d(TAG, "Uncaught exception start!");
        ex.printStackTrace();

        //Same as done in onTaskRemoved()
        PendingIntent service = PendingIntent.getService(
                getApplicationContext(),
                1001,
                new Intent(getApplicationContext(), MyService.class),
                PendingIntent.FLAG_ONE_SHOT);

        AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
        alarmManager.set(AlarmManager.ELAPSED_REALTIME_WAKEUP, 1000, service);
        System.exit(2);
        }
    };

Remarque: JE PENSE et je me souviens que je l'ai vérifié sur KitKat que START_STICKY ne fonctionne pas sur KitKat et les niveaux supérieurs d'API. Veuillez vérifier cela pour vous-même. 

PLUS:
Comme vous le faites régulièrement, vous devrez peut-être prendre en compte le mode sommeil profond. Pour que les choses fonctionnent dans un sommeil profond, utilisez WakefulBroadcastReceiver combiné avec AlarmManager. Jetez un coup d'œil à mon autre article Comment utiliser http en mode de veille prolongée . 

METTRE À JOUR:
Cette solution ne fonctionne pas (en fait, ne doit pas nécessairement fonctionner) si l'utilisateur "FORCE STOP" l'application à partir de Paramètres. C'est une bonne chose, car redémarrer le service n'est pas un bon moyen si l'utilisateur veut lui-même arrêter l'application. Alors c'est bon.

Answer 2

remplacer return Service.START_NOT_STICKY; par return START_STICKY;

Answer 3

Si vousSEULEMENTvoulez redémarrer le service après l'avoir supprimé de la tâche récente, une utilisation simple

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return START_STICKY;
}

Si vous utilisez START_STICKY, lorsque vous supprimez l'application d'une tâche récente, votre service sera supprimé (onTaskRemoved déclenché, onDestroyPASdéclenché)PUISil redémarrera automatiquement (onCreate déclenché, onStartComand déclenché )