Showing snack bar when you're the first to join a conference or when you're the last one in it

app/src/main/java/org/linphone/activities/main/files/fragments/PdfViewerFragment.kt

@@ -56,6 +56,5 @@ class PdfViewerFragment : GenericViewerFragment<FilePdfViewerFragmentBinding>()
 
         adapter = PdfPagesListAdapter(viewModel)
         binding.pdfViewPager.adapter = adapter
-        //adapter.notifyDataSetChanged()
     }
 }

app/src/main/java/org/linphone/activities/voip/fragments/ConferenceCallFragment.kt

@@ -136,6 +136,24 @@ class ConferenceCallFragment : GenericFragment<VoipConferenceCallFragmentBinding
             }
         }
 
+        conferenceViewModel.firstToJoinEvent.observe(
+            viewLifecycleOwner
+        ) {
+            Snackbar
+                .make(binding.coordinator, R.string.conference_first_to_join, Snackbar.LENGTH_LONG)
+                .setAnchorView(binding.primaryButtons.hangup)
+                .show()
+        }
+
+        conferenceViewModel.allParticipantsLeftEvent.observe(
+            viewLifecycleOwner
+        ) {
+            Snackbar
+                .make(binding.coordinator, R.string.conference_last_user, Snackbar.LENGTH_LONG)
+                .setAnchorView(binding.primaryButtons.hangup)
+                .show()
+        }
+
         controlsViewModel.goToConferenceParticipantsListEvent.observe(
             viewLifecycleOwner
         ) {

app/src/main/java/org/linphone/activities/voip/viewmodels/ConferenceViewModel.kt

@@ -49,13 +49,21 @@ class ConferenceViewModel : ViewModel() {
     val isRecording = MutableLiveData<Boolean>()
     val isRemotelyRecorded = MutableLiveData<Boolean>()
 
+    val maxParticipantsForMosaicLayout = corePreferences.maxConferenceParticipantsForMosaicLayout
+
+    val speakingParticipant = MutableLiveData<ConferenceParticipantDeviceData>()
+
     val participantAdminStatusChangedEvent: MutableLiveData<Event<ConferenceParticipantData>> by lazy {
         MutableLiveData<Event<ConferenceParticipantData>>()
     }
 
-    val maxParticipantsForMosaicLayout = corePreferences.maxConferenceParticipantsForMosaicLayout
+    val firstToJoinEvent: MutableLiveData<Event<Boolean>> by lazy {
+        MutableLiveData<Event<Boolean>>()
+    }
 
-    val speakingParticipant = MutableLiveData<ConferenceParticipantDeviceData>()
+    val allParticipantsLeftEvent: MutableLiveData<Event<Boolean>> by lazy {
+        MutableLiveData<Event<Boolean>>()
+    }
 
     private val conferenceListener = object : ConferenceListenerStub() {
         override fun onParticipantAdded(conference: Conference, participant: Participant) {
@@ -72,6 +80,10 @@ class ConferenceViewModel : ViewModel() {
         override fun onParticipantRemoved(conference: Conference, participant: Participant) {
             Log.i("[Conference] Participant removed: ${participant.address.asStringUriOnly()}")
             updateParticipantsList(conference)
+
+            if (conferenceParticipants.value.orEmpty().isEmpty()) {
+                allParticipantsLeftEvent.value = Event(true)
+            }
         }
 
         override fun onParticipantDeviceAdded(
@@ -246,6 +258,10 @@ class ConferenceViewModel : ViewModel() {
         isRecording.value = conference.isRecording
 
         updateConferenceLayout(conference)
+
+        if (conferenceParticipants.value.orEmpty().isEmpty()) {
+            firstToJoinEvent.value = Event(true)
+        }
     }
 
     fun configureConference(conference: Conference) {

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

@@ -721,4 +721,6 @@
     <string name="conference_low_bandwidth">Faible bande passante détectée, vidéo désactivée</string>
     <string name="content_description_toggle_conference_info_details">Afficher/cacher les détails de la conférence</string>
     <string name="content_description_conference_participants">Participants de la conférence</string>
+    <string name="conference_first_to_join">Vous êtes le premier à avoir rejoint la conférence</string>
+    <string name="conference_last_user">Tous les autres participants ont quitté la conférence</string>
 </resources>

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

@@ -290,6 +290,8 @@
     <string name="conference_invitation_received_notification">You have been invited to a conference</string>
     <string name="conference_invitation">Conference invitation</string>
     <string name="conference_low_bandwidth">Low bandwidth detected, disabling video</string>
+    <string name="conference_first_to_join">You\'re the first to join the conference</string>
+    <string name="conference_last_user">All other participants have left the conference</string>
 
     <!-- Call -->
     <string name="call_incoming_title">Incoming Call</string>