Add method for name fallback when there is only one member

matrix-sdk-android/src/androidTest/java/org/matrix/android/sdk/common/TestRoomDisplayNameFallbackProvider.kt

@@ -26,6 +26,9 @@ class TestRoomDisplayNameFallbackProvider : RoomDisplayNameFallbackProvider {
     override fun getNameForEmptyRoom(isDirect: Boolean, leftMemberNames: List<String>) =
             "Empty room"
 
+    override fun getNameFor1member(name: String) =
+            name
+
     override fun getNameFor2members(name1: String, name2: String) =
             "$name1 and $name2"
 

matrix-sdk-android/src/main/java/org/matrix/android/sdk/api/RoomDisplayNameFallbackProvider.kt

@@ -19,6 +19,7 @@ package org.matrix.android.sdk.api
 interface RoomDisplayNameFallbackProvider {
     fun getNameForRoomInvite(): String
     fun getNameForEmptyRoom(isDirect: Boolean, leftMemberNames: List<String>): String
+    fun getNameFor1member(name: String): String
     fun getNameFor2members(name1: String, name2: String): String
     fun getNameFor3members(name1: String, name2: String, name3: String): String
     fun getNameFor4members(name1: String, name2: String, name3: String, name4: String): String

matrix-sdk-android/src/main/java/org/matrix/android/sdk/internal/session/room/membership/RoomDisplayNameResolver.kt

@@ -112,7 +112,11 @@ internal class RoomDisplayNameResolver @Inject constructor(
                             .map { it.getBestName() }
                     roomDisplayNameFallbackProvider.getNameForEmptyRoom(roomSummary?.isDirect.orFalse(), leftMembersNames)
                 }
-                1    -> resolveRoomMemberName(otherMembersSubset[0], roomMembers)
+                1    -> {
+                    roomDisplayNameFallbackProvider.getNameFor1member(
+                            resolveRoomMemberName(otherMembersSubset[0], roomMembers)
+                    )
+                }
                 2    -> {
                     roomDisplayNameFallbackProvider.getNameFor2members(
                             resolveRoomMemberName(otherMembersSubset[0], roomMembers),

vector/src/main/java/im/vector/app/features/room/VectorRoomDisplayNameFallbackProvider.kt

@@ -36,6 +36,8 @@ class VectorRoomDisplayNameFallbackProvider(
         }
     }
 
+    override fun getNameFor1member(name: String) = name
+
     override fun getNameFor2members(name1: String, name2: String): String {
         return context.getString(R.string.room_displayname_two_members, name1, name2)
     }