Fix crash on background

AndroidManifest.xml

@@ -2,8 +2,8 @@
 <manifest package="org.linphone"
           xmlns:android="http://schemas.android.com/apk/res/android"
           android:installLocation="auto"
-          android:versionCode="1460"
-          android:versionName="1.4.6">
+          android:versionCode="2000"
+          android:versionName="2.0.0">
 
     <uses-sdk
         android:minSdkVersion="26"
@@ -199,7 +199,7 @@
         <service
             android:name=".LinphoneService"
             android:label="@string/service_name"
-            android:stopWithTask="false"/>
+        />
         <service
             android:name=".sync.SyncService"
             android:exported="true">

res/raw/linphonerc_factory

@@ -46,7 +46,6 @@ activation_code_length=4
 show_login_view=1
 friendlist_subscription_enabled=1
 debug_popup_magic=#1234
-debug=1
 
 [assistant]
 password_max_length=-1

src/android/org/linphone/LinphoneManager.java

@@ -990,9 +990,10 @@ public class LinphoneManager implements CoreListener, SensorEventListener, Accou
 
 	public static synchronized void destroy() {
 		if (instance == null) return;
-		getInstance().changeStatusToOffline();
+		instance.changeStatusToOffline();
 		sExited = true;
 		instance.destroyCore();
+		instance = null;
 	}
 
 	private String getString(int key) {

src/android/org/linphone/LinphoneService.java

@@ -84,7 +84,7 @@ import static org.linphone.LinphoneUtils.getZrtpStatus;
  * Linphone service, reacting to Incoming calls, ...<br />
  *
  * Roles include:<ul>
- * <li>Initializing LinphoneManager</li>
+ * <li>Initializing LinphoneManager</li>F
  * <li>Starting C libLinphone through LinphoneManager</li>
  * <li>Reacting to LinphoneManager state changes</li>
  * <li>Delegating GUI state change actions to GUI listener</li>
@@ -322,8 +322,12 @@ public final class LinphoneService extends Service {
 	public int onStartCommand(Intent intent, int flags, int startId) {
 		super.onStartCommand(intent, flags, startId);
 
-		if (!LinphoneManager.isInstanciated())
-			LinphoneManager.createAndStart(LinphoneService.this);
+		if (instance != null) {
+			Log.w("Attempt to start the LinphoneService but it is already running !");
+			return START_REDELIVER_INTENT;
+		}
+
+		LinphoneManager.createAndStart(LinphoneService.this);
 
 		instance = this; // instance is ready once linphone manager has been created
 		LinphoneManager.getLc().addListener(mListener = new CoreListenerStub() {
@@ -438,7 +442,7 @@ public final class LinphoneService extends Service {
 		AlarmManager alarmManager = ((AlarmManager) this.getSystemService(Context.ALARM_SERVICE));
 		Compatibility.scheduleAlarm(alarmManager, AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + 600000, keepAlivePendingIntent);
 
-		return START_STICKY;
+		return START_REDELIVER_INTENT;
 	}
 
 	@SuppressWarnings("unchecked")

src/android/org/linphone/receivers/BootReceiver.java

@@ -39,7 +39,7 @@ public class BootReceiver extends BroadcastReceiver {
 		} else {
 			boolean autostart = LinphonePreferences.instance().isAutoStartEnabled();
 			android.util.Log.i("LinphoneBootReceiver", "Device is starting, auto_start is " + autostart);
-			if (autostart) {
+			if (autostart && !LinphoneService.isReady()) {
 				Intent lLinphoneServiceIntent = new Intent(Intent.ACTION_MAIN);
 				lLinphoneServiceIntent.setClass(context, LinphoneService.class);
 				lLinphoneServiceIntent.putExtra("ForceStartForeground", true);