Log if user has restricted app from being allowed to run in background (Android 9+)

app/src/main/java/org/linphone/LinphoneActivity.java

@@ -1391,6 +1391,11 @@ public class LinphoneActivity extends LinphoneGenericActivity
                     this, permissions, PERMISSIONS_READ_EXTERNAL_STORAGE_DEVICE_RINGTONE);
         }
         ContactsManager.getInstance().initializeContactManager(this);
+
+        if (DeviceUtils.isAppUserRestricted(this)) {
+            Log.w(
+                    "[Linphone Activity] Device has been restricted by user (Android 9+), push notifications won't work !");
+        }
     }
 
     @Override

app/src/main/java/org/linphone/compatibility/ApiTwentyEightPlus.java

@@ -22,6 +22,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 import static org.linphone.compatibility.Compatibility.CHAT_NOTIFICATIONS_GROUP;
 
 import android.annotation.TargetApi;
+import android.app.ActivityManager;
 import android.app.Notification;
 import android.app.PendingIntent;
 import android.app.Person;
@@ -78,4 +79,10 @@ class ApiTwentyEightPlus {
                 .addAction(ApiTwentyFourPlus.getMarkMessageAsReadAction(context, notif))
                 .build();
     }
+
+    public static boolean isAppUserRestricted(Context context) {
+        ActivityManager activityManager =
+                (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        return activityManager.isBackgroundRestricted();
+    }
 }

app/src/main/java/org/linphone/compatibility/Compatibility.java

@@ -196,4 +196,11 @@ public class Compatibility {
             ApiTwentyOnePlus.closeContentProviderClient(client);
         }
     }
+
+    public static boolean isAppUserRestricted(Context context) {
+        if (Version.sdkAboveOrEqual(Version.API28_PIE_90)) {
+            return ApiTwentyEightPlus.isAppUserRestricted(context);
+        }
+        return false;
+    }
 }

app/src/main/java/org/linphone/utils/DeviceUtils.java

@@ -36,6 +36,7 @@ import android.widget.TextView;
 import androidx.core.content.ContextCompat;
 import java.util.List;
 import org.linphone.R;
+import org.linphone.compatibility.Compatibility;
 import org.linphone.core.tools.Log;
 import org.linphone.settings.LinphonePreferences;
 
@@ -120,6 +121,10 @@ public class DeviceUtils {
         return getDevicePowerManagerIntent(context) != null;
     }
 
+    public static boolean isAppUserRestricted(Context context) {
+        return Compatibility.isAppUserRestricted(context);
+    }
+
     public static void displayDialogIfDeviceHasPowerManagerThatCouldPreventPushNotifications(
             final Context context) {
         for (final Intent intent : POWERMANAGER_INTENTS) {