User now knows if no offline messages are saved when entering a conversation

app/src/main/java/com/nextcloud/talk/chat/ChatActivity.kt

@@ -194,6 +194,7 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.withContext
@@ -444,7 +445,7 @@ class ChatActivity :
 
         this.lifecycleScope.launch {
             delay(DELAY_TO_SHOW_PROGRESS_BAR)
-            if (adapter?.isEmpty == true) {
+            if (adapter?.isEmpty == true && networkMonitor.isOnline.first()) {
                 binding.progressBar.visibility = View.VISIBLE
             }
         }
@@ -939,6 +940,20 @@ class ChatActivity :
                 .collect()
         }
 
+        this.lifecycleScope.launch {
+            chatViewModel.getGeneralUIFlow.onEach { key ->
+                when (key) {
+                    NO_OFFLINE_MESSAGES_FOUND -> {
+                        if (networkMonitor.isOnline.first().not()) {
+                            binding.offline.root.visibility = View.VISIBLE
+                        }
+                    }
+
+                    else -> {}
+                }
+            }.collect()
+        }
+
         chatViewModel.reactionDeletedViewState.observe(this) { state ->
             when (state) {
                 is ChatViewModel.ReactionDeletedSuccessState -> {
@@ -2810,14 +2825,10 @@ class ChatActivity :
             message1.timestamp
         )
         val isLessThan5Min = timeDifference > FIVE_MINUTES_IN_SECONDS
-        if (isSameDayMessages(message2, message1) &&
+        return isSameDayMessages(message2, message1) &&
             (message2.actorId == message1.actorId) &&
             (!isLessThan5Min) &&
             (message2.lastEditTimestamp == 0L || message1.lastEditTimestamp == 0L)
-        ) {
-            return true
-        }
-        return false
     }
 
     private fun determinePreviousMessageIds(chatMessageList: List<ChatMessage>) {
@@ -3848,5 +3859,6 @@ class ChatActivity :
         private const val DELAY_TO_SHOW_PROGRESS_BAR = 1000L
         private const val FIVE_MINUTES_IN_SECONDS: Long = 300
         const val CONVERSATION_INTERNAL_ID = "CONVERSATION_INTERNAL_ID"
+        const val NO_OFFLINE_MESSAGES_FOUND = "NO_OFFLINE_MESSAGES_FOUND"
     }
 }

app/src/main/java/com/nextcloud/talk/chat/data/ChatMessageRepository.kt

@@ -35,6 +35,12 @@ interface ChatMessageRepository : LifecycleAwareManager {
 
     val lastReadMessageFlow: Flow<Int>
 
+    /**
+     * Used for informing the user of the underlying processing behind offline support, [String] is the key
+     * which is handled in a switch statement in ChatActivity.
+     */
+    val generalUIFlow: Flow<String>
+
     fun setData(conversationModel: ConversationModel, credentials: String, urlForChatting: String)
 
     fun loadInitialMessages(withNetworkParams: Bundle): Job

app/src/main/java/com/nextcloud/talk/chat/data/network/OfflineFirstChatRepository.kt

@@ -10,6 +10,7 @@ package com.nextcloud.talk.chat.data.network
 
 import android.os.Bundle
 import android.util.Log
+import com.nextcloud.talk.chat.ChatActivity
 import com.nextcloud.talk.chat.data.ChatMessageRepository
 import com.nextcloud.talk.chat.data.model.ChatMessage
 import com.nextcloud.talk.data.database.dao.ChatBlocksDao
@@ -91,6 +92,11 @@ class OfflineFirstChatRepository @Inject constructor(
     private val _lastReadMessageFlow:
         MutableSharedFlow<Int> = MutableSharedFlow()
 
+    override val generalUIFlow: Flow<String>
+        get() = _generalUIFlow
+
+    private val _generalUIFlow: MutableSharedFlow<String> = MutableSharedFlow()
+
     private var newXChatLastCommonRead: Int? = null
     private var itIsPaused = false
     private val scope = CoroutineScope(Dispatchers.IO)
@@ -133,6 +139,7 @@ class OfflineFirstChatRepository @Inject constructor(
             } else {
                 if (!weAlreadyHaveSomeOfflineMessages) {
                     Log.d(TAG, "An online request for newest 100 messages is made because offline chat is empty")
+                    _generalUIFlow.emit(ChatActivity.NO_OFFLINE_MESSAGES_FOUND)
                 } else {
                     Log.d(
                         TAG,

app/src/main/java/com/nextcloud/talk/chat/viewmodels/ChatViewModel.kt

@@ -137,6 +137,8 @@ class ChatViewModel @Inject constructor(
             _getRoomViewState.value = GetRoomErrorState
         }
 
+    val getGeneralUIFlow = chatRepository.generalUIFlow
+
     sealed interface ViewState
 
     object GetReminderStartState : ViewState

app/src/main/res/layout/activity_chat.xml

@@ -98,6 +98,12 @@
         android:layout_height="0dp"
         android:layout_weight="1">
 
+        <include
+            android:id="@+id/offline"
+            layout="@layout/no_saved_messages_view"
+            android:visibility="gone"
+            tools:visibility="visible" />
+
         <include
             android:id="@+id/lobby"
             layout="@layout/lobby_view"

app/src/main/res/layout/no_saved_messages_view.xml

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Nextcloud Talk - Android Client
+  ~
+  ~ SPDX-FileCopyrightText: 2024 Julius Linus <[email protected]>
+  ~ SPDX-License-Identifier: GPL-3.0-or-later
+-->
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/offline_view"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <ImageView
+        android:id="@+id/offline_image_view"
+        android:layout_width="64dp"
+        android:layout_height="64dp"
+        android:layout_above="@id/offline_text_view"
+        android:layout_centerHorizontal="true"
+        android:layout_margin="@dimen/margin_between_elements"
+        android:contentDescription="@string/nc_lobby"
+        android:src="@drawable/ic_signal_wifi_off_white_24dp"
+        app:tint="@color/grey_600" />
+
+    <TextView
+        android:id="@+id/offline_text_view"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_centerInParent="true"
+        android:layout_margin="@dimen/standard_margin"
+        android:text="@string/no_offline_messages_saved"
+        android:textAlignment="center"
+        android:textColor="@color/grey_600"
+        android:textSize="16sp"
+        android:autoLink="web" />
+
+</RelativeLayout>

app/src/main/res/values/strings.xml

@@ -834,6 +834,7 @@ How to translate with transifex:
     <string name="archived">Archived</string>
     <string name="archive_hint">Once a conversation is archived, it will be hidden by default. Select the filter \"Archived\" to view archived conversations. Direct mentions will still be received.</string>
     <string name="unarchive_hint">Once a conversation is unarchived, it will be shown by default again.</string>
+    <string name="no_offline_messages_saved">No offline messages saved</string>
     <string name="previously_set">Previously set</string>
     <string name="conversation_read_only_failed">Failed to set conversation Read-only</string>
     <string name="status_reverted">Status Reverted</string>