How to restart a service after an application has been killed from recent tasks

Question

I created a service to periodically select the current location of the device. I want the service to start in the background, even if the application is cleared of recently opened applications. Currently, the service runs in the background only until the application is present in recently opened applications, but stops immediately when the application is deleted (or otherwise killed). I tried all the help available in stack overflow, but I can't solve it. Please help. Here is my code for the 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

Override onTaskRemoved () in your service and use the alarm manager to start the service again. Below is the code for our application that does the same and works great:

 @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); } 

As you can periodically send a location even if the service was killed in low memory (or for some reason), I suggest you handle the uncaughtException to restart it after N seconds. Here's how we did it in our application, which works great:

 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); } }; 

Note: I THINK and I remember that I checked it in Kitkat that START_STICKY does not work on Kitkat levels and above the API. Please confirm this yourself.

MORE:
Since you periodically send local dispatches, you might have to consider deep sleep mode. To make things work in deep sleep, use the WakefulBroadcastReceiver in combination with the AlarmManager. Take a look at my other post How to use http in deep sleep mode .

UPDATE:
This solution does not work (in fact, it doesn’t need to work) if the user "FORCE STOP" the application from "Settings". This is actually good, since restarting the service is not a good way if the user himself wants to stop the application. So this is normal.

Answer 2

replace return Service.START_NOT_STICKY; on return START_STICKY;

Answer 3

If you ONLY want to restart the service after killing it from a recent task, just use

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

If you use START_STICKY when you kill the application from a recent task, your service will be killed ( onTaskRemoved fired, onDestroy NOT ) THEN it will automatically start again ( onCreate fired, onStartComand fired)

Answer 4

I tried all these options, but the problem has not been solved yet, OnTaskRemoved is called, but you cannot perform the operation in this method