Trying to plumb list changes...

app/build.gradle

@@ -83,8 +83,12 @@ dependencies {
     implementation "androidx.navigation:navigation-compose:$nav_version"
 
     implementation 'androidx.activity:activity-compose:1.4.3'
-    implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.6.1'
-    implementation 'androidx.lifecycle:lifecycle-viewmodel-compose:2.6.1'
+
+    // Lifecycle
+    def lifecycle_version = "2.6.1"
+    implementation "androidx.lifecycle:lifecycle-runtime-compose:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-runtime-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-compose:$lifecycle_version"
 
     implementation "androidx.compose.ui:ui:1.4.3"
     implementation 'androidx.compose.material:material:1.4.3'

app/src/main/java/net/buzzert/kordophonedroid/ui/conversationlist/ConversationListScreen.kt

@@ -21,6 +21,7 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.Dp
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
+import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.hilt.navigation.compose.hiltViewModel
 import net.buzzert.kordophone.backend.model.Conversation
 
@@ -29,7 +30,7 @@ fun ConversationListScreen(
     viewModel: ConversationListViewModel = hiltViewModel(),
     onConversationSelected: (conversationID: String) -> Unit
 ) {
-    val conversations by viewModel.conversations.collectAsState(initial = listOf())
+    val conversations by viewModel.conversations.collectAsStateWithLifecycle(initialValue = listOf())
     ConversationListView(conversations = conversations, onConversationSelected = onConversationSelected)
 }
 
@@ -56,6 +57,7 @@ fun ConversationListView(
                     name = conversation.formattedDisplayName(),
                     id = conversation.guid,
                     isUnread = conversation.unreadCount > 0,
+                    lastMessagePreview = conversation.lastMessagePreview ?: "",
                     onClick = { onConversationSelected(conversation.guid) }
                 )
             }
@@ -68,6 +70,7 @@ fun ConversationListItem(
     name: String,
     id: String,
     isUnread: Boolean,
+    lastMessagePreview: String,
     onClick: () -> Unit
 ) {
     val unreadSize = 12.dp
@@ -113,7 +116,7 @@ fun ConversationListItem(
                 Spacer(Modifier.width(horizontalPadding))
             }
 
-            Text("This is a test.")
+            Text(lastMessagePreview)
 
             Spacer(Modifier.height(verticalPadding))
             Divider()
@@ -139,7 +142,7 @@ fun UnreadIndicator(size: Dp, modifier: Modifier = Modifier) {
 @Composable
 fun ConversationListItemPreview() {
     Column(modifier = Modifier.background(MaterialTheme.colors.background)) {
-        ConversationListItem(name = "James Magahern", id = "asdf", isUnread = true) {}
+        ConversationListItem(name = "James Magahern", id = "asdf", lastMessagePreview = "This is a test", isUnread = true) {}
     }
 }
 

app/src/main/java/net/buzzert/kordophonedroid/ui/conversationlist/ConversationListViewModel.kt

@@ -1,9 +1,12 @@
 package net.buzzert.kordophonedroid.ui.conversationlist
 
+import android.util.Log
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.launch
 import net.buzzert.kordophone.backend.model.Conversation
 import net.buzzert.kordophone.backend.server.ChatRepository
@@ -15,6 +18,10 @@ class ConversationListViewModel @Inject constructor(
 ) : ViewModel() {
     val conversations: Flow<List<Conversation>>
         get() = repository.conversationChanges
+            .map {
+                it.sortedBy { it.date }
+                    .reversed()
+            }
 
     init {
         viewModelScope.launch {
@@ -24,5 +31,11 @@ class ConversationListViewModel @Inject constructor(
         viewModelScope.launch {
             repository.beginWatchingForUpdates(this)
         }
+
+        viewModelScope.launch {
+            repository.conversationChanges.collect {
+                Log.v("ViewModel", "Got conversationChanges")
+            }
+        }
     }
 }

backend/src/main/java/net/buzzert/kordophone/backend/server/ChatRepository.kt

@@ -122,9 +122,11 @@ class ChatRepository(
         val conversations = fetchConversations()
         database.writeConversations(conversations)
 
+        // TODO: Delete non-existent conversations.
+
         // Sync top N number of conversations' message content
         Log.d(REPO_LOG, "Synchronizing messages")
-        val sortedConversations = conversations.sortedBy { it.date }
+        val sortedConversations = conversations.sortedBy { it.date }.reversed()
         for (conversation in sortedConversations.take(CONVERSATION_MESSAGE_SYNC_COUNT)) {
             val messages = fetchMessages(conversation)
             database.writeMessages(messages, conversation)