Preserve Conversation List position

app/src/main/java/com/nextcloud/talk/adapters/items/ConversationItem.kt

@@ -59,6 +59,7 @@ class ConversationItem(
     IFilterable<String?> {
     private var header: GenericTextHeaderItem? = null
     private val chatMessage = model.lastMessage?.asModel()
+    var mHolder: ConversationItemViewHolder? = null
 
     constructor(
         conversation: ConversationModel,
@@ -97,6 +98,7 @@ class ConversationItem(
         position: Int,
         payloads: List<Any>
     ) {
+        mHolder = holder
         val appContext = sharedApplication!!.applicationContext
         holder.binding.dialogName.setTextColor(
             ResourcesCompat.getColor(

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

@@ -392,7 +392,6 @@ class ChatActivity :
     private val onBackPressedCallback = object : OnBackPressedCallback(true) {
         override fun handleOnBackPressed() {
             val intent = Intent(this@ChatActivity, ConversationsListActivity::class.java)
-            intent.putExtras(Bundle())
             startActivity(intent)
         }
     }

app/src/main/java/com/nextcloud/talk/conversationlist/ConversationsListActivity.kt

@@ -345,6 +345,16 @@ class ConversationsListActivity :
         showSearchOrToolbar()
     }
 
+    override fun onPause() {
+        super.onPause()
+        val firstVisible = layoutManager?.findFirstVisibleItemPosition() ?: 0
+        val firstItem = adapter?.getItem(firstVisible)
+        val firstTop = (firstItem as ConversationItem).mHolder?.itemView?.top
+        val firstOffset = firstTop?.minus(CONVERSATION_ITEM_HEIGHT) ?: 0
+
+        appPreferences.setConversationListPositionAndOffset(firstVisible, firstOffset)
+    }
+
     // if edge to edge is used, add an empty item at the bottom of the list
     @Suppress("MagicNumber")
     private fun addEmptyItemForEdgeToEdgeIfNecessary() {
@@ -426,6 +436,9 @@ class ConversationsListActivity :
                         .firstOrNull { ConversationUtils.isNoteToSelfConversation(it) }
                     val isNoteToSelfAvailable = noteToSelf != null
                     handleNoteToSelfShortcut(isNoteToSelfAvailable, noteToSelf?.token ?: "")
+
+                    val pair = appPreferences.conversationListPositionAndOffset
+                    layoutManager?.scrollToPositionWithOffset(pair.first, pair.second)
                 }.collect()
         }
 
@@ -1873,7 +1886,6 @@ class ConversationsListActivity :
 
         val bundle = Bundle()
         bundle.putString(KEY_ROOM_TOKEN, selectedConversation!!.token)
-        // bundle.putString(KEY_ROOM_ID, selectedConversation!!.roomId)
         bundle.putString(KEY_SHARED_TEXT, textToPaste)
         if (selectedMessageId != null) {
             bundle.putString(BundleKeys.KEY_MESSAGE_ID, selectedMessageId)
@@ -2221,5 +2233,6 @@ class ConversationsListActivity :
         private const val SIXTEEN_HOURS_IN_SECONDS: Long = 57600
         const val LONG_1000: Long = 1000
         private const val NOTE_TO_SELF_SHORTCUT_ID = "NOTE_TO_SELF_SHORTCUT_ID"
+        private const val CONVERSATION_ITEM_HEIGHT = 44
     }
 }

app/src/main/java/com/nextcloud/talk/utils/preferences/AppPreferences.java

@@ -13,6 +13,8 @@
 
 import com.nextcloud.talk.ui.PlaybackSpeed;
 
+import kotlin.Pair;
+
 @SuppressLint("NonConstantResourceId")
 public interface AppPreferences {
 
@@ -185,5 +187,9 @@ public interface AppPreferences {
 
     void setShowRegularNotificationWarning(boolean value);
 
+    void setConversationListPositionAndOffset(int position, int offset);
+
+    Pair<Integer, Integer> getConversationListPositionAndOffset();
+
     void clear();
 }

app/src/main/java/com/nextcloud/talk/utils/preferences/AppPreferencesImpl.kt

@@ -412,6 +412,28 @@ class AppPreferencesImpl(val context: Context) : AppPreferences {
             }
         }
 
+    override fun setConversationListPositionAndOffset(position: Int, offset: Int) {
+        runBlocking<Unit> {
+            async {
+                writeString(CONVERSATION_LIST_POSITION_OFFSET, "$position,$offset")
+            }
+        }
+    }
+
+    override fun getConversationListPositionAndOffset(): Pair<Int, Int> {
+        val pairString = runBlocking {
+            async { readString(CONVERSATION_LIST_POSITION_OFFSET).first() }
+        }.getCompleted()
+
+        if (pairString.isEmpty()) return Pair(0, 0)
+
+        val pairArr = pairString.split(',')
+        val position = pairArr[0].toInt()
+        val offset = pairArr[1].toInt()
+
+        return Pair(position, offset)
+    }
+
     override fun setPhoneBookIntegrationLastRun(currentTimeMillis: Long) =
         runBlocking<Unit> {
             async {
@@ -626,6 +648,7 @@ class AppPreferencesImpl(val context: Context) : AppPreferences {
         const val VOICE_MESSAGE_PLAYBACK_SPEEDS = "voice_message_playback_speeds"
         const val SHOW_REGULAR_NOTIFICATION_WARNING = "show_regular_notification_warning"
         const val LAST_NOTIFICATION_WARNING = "last_notification_warning"
+        const val CONVERSATION_LIST_POSITION_OFFSET = "CONVERSATION_LIST_POSITION_OFFSET"
         private fun String.convertStringToArray(): Array<Float> {
             var varString = this
             val floatList = mutableListOf<Float>()