update lastSeenAt on Notification dismissal.

app/src/main/AndroidManifest.xml

@@ -31,6 +31,8 @@
         android:windowSoftInputMode="adjustResize"/>
 
     <service android:name=".service.RocketChatService"/>
+
+    <service android:name=".service.notification.NotificationDismissalCallbackService"/>
   </application>
 
 </manifest>

app/src/main/java/chat/rocket/android/service/notification/NotificationDismissalCallbackService.java

+package chat.rocket.android.service.notification;
+
+import android.app.IntentService;
+import android.content.Intent;
+import chat.rocket.android.model.internal.NotificationItem;
+import chat.rocket.android.realm_helper.RealmHelper;
+import chat.rocket.android.realm_helper.RealmStore;
+
+/**
+ * triggered when notification is dismissed.
+ */
+public class NotificationDismissalCallbackService extends IntentService {
+  public NotificationDismissalCallbackService() {
+    super(NotificationDismissalCallbackService.class.getSimpleName());
+  }
+
+  @Override protected void onHandleIntent(Intent intent) {
+    if (!intent.hasExtra("serverConfigId") || !intent.hasExtra("roomId")) {
+      return;
+    }
+
+    String serverConfigId = intent.getStringExtra("serverConfigId");
+    String roomId = intent.getStringExtra("roomId");
+
+    RealmHelper realmHelper = RealmStore.get(serverConfigId);
+    if (realmHelper == null) {
+      return;
+    }
+
+    realmHelper.executeTransaction(realm -> {
+      NotificationItem item =
+          realm.where(NotificationItem.class).equalTo("roomId", roomId).findFirst();
+      if (item != null) {
+        long currentTime = System.currentTimeMillis();
+        if (item.getLastSeenAt() <= currentTime) {
+          item.setLastSeenAt(currentTime);
+        }
+      }
+      return null;
+    });
+  }
+}

app/src/main/java/chat/rocket/android/service/observer/NotificationItemObserver.java

@@ -20,6 +20,7 @@ import chat.rocket.android.model.ServerConfig;
 import chat.rocket.android.model.internal.NotificationItem;
 import chat.rocket.android.realm_helper.RealmHelper;
 import chat.rocket.android.realm_helper.RealmStore;
+import chat.rocket.android.service.notification.NotificationDismissalCallbackService;
 import io.realm.Realm;
 import io.realm.RealmResults;
 import java.util.List;
@@ -83,8 +84,7 @@ public class NotificationItemObserver extends AbstractModelObserver<Notification
         });
   }
 
-  private Notification generateNotification(String roomId, String title,
-      @NonNull String description, int unreadCount, @Nullable Bitmap icon) {
+  private PendingIntent getContentIntent(String roomId) {
     Intent intent = new Intent(context, MainActivity.class);
     intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT | Intent.FLAG_ACTIVITY_CLEAR_TOP);
     ServerConfig config = RealmStore.getDefault().executeTransactionForRead(realm ->
@@ -94,9 +94,27 @@ public class NotificationItemObserver extends AbstractModelObserver<Notification
       intent.putExtra("roomId", roomId);
     }
 
-    PendingIntent pendingIntent = PendingIntent.getActivity(context.getApplicationContext(),
+    return PendingIntent.getActivity(context.getApplicationContext(),
         (int) (System.currentTimeMillis() % Integer.MAX_VALUE),
         intent, PendingIntent.FLAG_ONE_SHOT);
+  }
+
+  private PendingIntent getDeleteIntent(String roomId) {
+    Intent intent = new Intent(context, NotificationDismissalCallbackService.class);
+    ServerConfig config = RealmStore.getDefault().executeTransactionForRead(realm ->
+        realm.where(ServerConfig.class).equalTo("hostname", hostname).findFirst());
+    if (config != null) {
+      intent.putExtra("serverConfigId", config.getServerConfigId());
+      intent.putExtra("roomId", roomId);
+    }
+
+    return PendingIntent.getService(context.getApplicationContext(),
+        (int) (System.currentTimeMillis() % Integer.MAX_VALUE),
+        intent, PendingIntent.FLAG_ONE_SHOT);
+  }
+
+  private Notification generateNotification(String roomId, String title,
+      @NonNull String description, int unreadCount, @Nullable Bitmap icon) {
 
     NotificationCompat.Builder builder = new NotificationCompat.Builder(context)
         .setContentTitle(title)
@@ -104,7 +122,8 @@ public class NotificationItemObserver extends AbstractModelObserver<Notification
         .setNumber(unreadCount)
         .setColor(ContextCompat.getColor(context, R.color.colorPrimary))
         .setSmallIcon(R.drawable.rocket_chat_notification_24dp)
-        .setContentIntent(pendingIntent);
+        .setContentIntent(getContentIntent(roomId))
+        .setDeleteIntent(getDeleteIntent(roomId));
 
     if (icon != null) {
       builder.setLargeIcon(icon);

realm-helpers/src/main/java/chat/rocket/android/realm_helper/RealmHelper.java

@@ -76,8 +76,20 @@ public class RealmHelper {
     }
   }
 
+  private boolean shouldUseSync() {
+    // ref: realm-java:realm/realm-library/src/main/java/io/realm/AndroidNotifier.java
+    // #isAutoRefreshAvailable()
+
+    if (Looper.myLooper() == null) {
+      return true;
+    }
+
+    String threadName = Thread.currentThread().getName();
+    return threadName != null && threadName.startsWith("IntentService[");
+  }
+
   public Task<Void> executeTransaction(final RealmHelper.Transaction transaction) {
-    return Looper.myLooper() == null ? executeTransactionSync(transaction)
+    return shouldUseSync() ? executeTransactionSync(transaction)
         : executeTransactionAsync(transaction);
   }