android: Update chats when enter the app from background (#1196)

* android: Update chats when enter the app from background

* Nullify current chat id if the chat was deleted in background

apps/android/app/src/main/java/chat/simplex/app/SimplexApp.kt

@@ -94,6 +94,14 @@ class SimplexApp: Application(), LifecycleEventObserver {
     Log.d(TAG, "onStateChanged: $event")
     withApi {
       when (event) {
+        Lifecycle.Event.ON_START -> {
+          if (chatModel.chatRunning.value == true) {
+            kotlin.runCatching {
+              val chats = chatController.apiGetChats()
+              chatModel.updateChats(chats)
+            }.onFailure { Log.e(TAG, it.stackTraceToString()) }
+          }
+        }
         Lifecycle.Event.ON_RESUME -> {
           if (chatModel.onboardingStage.value == OnboardingStage.OnboardingComplete) {
             chatController.showBackgroundServiceNoticeIfNeeded()

apps/android/app/src/main/java/chat/simplex/app/model/ChatModel.kt

@@ -114,6 +114,12 @@ class ChatModel(val controller: ChatController) {
     }
     chats.clear()
     chats.addAll(mergedChats)
+
+    val cId = chatId.value
+    // If chat is null, it was deleted in background after apiGetChats call
+    if (cId != null && getChat(cId) == null) {
+      chatId.value = null
+    }
   }
 
   fun updateNetworkStatus(id: ChatId, status: Chat.NetworkStatus) {

apps/android/app/src/main/java/chat/simplex/app/model/SimpleXAPI.kt

@@ -377,7 +377,7 @@ open class ChatController(var ctrl: ChatCtrl?, val ntfManager: NtfManager, val a
   suspend fun apiGetChats(): List<Chat> {
     val r = sendCmd(CC.ApiGetChats())
     if (r is CR.ApiChats ) return r.chats
-    throw Error("failed getting the list of chats: ${r.responseType} ${r.details}")
+    throw Exception("failed getting the list of chats: ${r.responseType} ${r.details}")
   }
 
   suspend fun apiGetChat(type: ChatType, id: Long, pagination: ChatPagination = ChatPagination.Last(ChatPagination.INITIAL_COUNT), search: String = ""): Chat? {