Try to fix crash about UrlPreview (#2640)

CHANGES.md

@@ -8,7 +8,7 @@ Improvements 🙌:
  - Fetch homeserver type and version and display in a new setting screen and add info in rageshakes (#2831)
 
 Bugfix 🐛:
- -
+ - Try to fix crash about UrlPreview (#2640)
 
 Translations 🗣:
  -

vector/src/main/java/im/vector/app/features/home/room/detail/RoomDetailViewModel.kt

@@ -132,7 +132,7 @@ class RoomDetailViewModel @AssistedInject constructor(
     val timeline = room.createTimeline(eventId, timelineSettings)
 
     // Same lifecycle than the ViewModel (survive to screen rotation)
-    val previewUrlRetriever = PreviewUrlRetriever(session)
+    val previewUrlRetriever = PreviewUrlRetriever(session, viewModelScope)
 
     // Slot to keep a pending action during permission request
     var pendingAction: RoomDetailAction? = null
@@ -1425,7 +1425,7 @@ class RoomDetailViewModel @AssistedInject constructor(
                 snapshot
                         .takeIf { state.asyncRoomSummary.invoke()?.isEncrypted == false }
                         ?.forEach {
-                            previewUrlRetriever.getPreviewUrl(it, viewModelScope)
+                            previewUrlRetriever.getPreviewUrl(it)
                         }
             }
         }

vector/src/main/java/im/vector/app/features/home/room/detail/timeline/url/PreviewUrlRetriever.kt

@@ -16,17 +16,17 @@
 
 package im.vector.app.features.home.room.detail.timeline.url
 
-import android.os.Handler
-import android.os.Looper
 import im.vector.app.BuildConfig
 import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
 import org.matrix.android.sdk.api.cache.CacheStrategy
 import org.matrix.android.sdk.api.session.Session
 import org.matrix.android.sdk.api.session.room.timeline.TimelineEvent
 import org.matrix.android.sdk.api.session.room.timeline.getLatestEventId
 
-class PreviewUrlRetriever(session: Session) {
+class PreviewUrlRetriever(session: Session,
+                          private val coroutineScope: CoroutineScope) {
     private val mediaService = session.mediaService()
 
     private data class EventIdPreviewUrlUiState(
@@ -38,12 +38,11 @@ class PreviewUrlRetriever(session: Session) {
     // Keys are the main eventId
     private val data = mutableMapOf<String, EventIdPreviewUrlUiState>()
     private val listeners = mutableMapOf<String, MutableSet<PreviewUrlRetrieverListener>>()
-    private val uiHandler = Handler(Looper.getMainLooper())
 
     // In memory list
     private val blockedUrl = mutableSetOf<String>()
 
-    fun getPreviewUrl(event: TimelineEvent, coroutineScope: CoroutineScope) {
+    fun getPreviewUrl(event: TimelineEvent) {
         val eventId = event.root.eventId ?: return
         val latestEventId = event.getLatestEventId()
 
@@ -115,7 +114,7 @@ class PreviewUrlRetriever(session: Session) {
     private fun updateState(eventId: String, latestEventId: String, state: PreviewUrlUiState) {
         data[eventId] = EventIdPreviewUrlUiState(latestEventId, state)
         // Notify the listener
-        uiHandler.post {
+        coroutineScope.launch(Dispatchers.Main) {
             listeners[eventId].orEmpty().forEach {
                 it.onStateUpdated(state)
             }