Implement read/write text stream to RttCall.

This change also:

1. Add simulator support of RTT request during call (always accept at this moment, will add random accept/decline in the future)
2. Fix bugs of putting RTT call in background and back to call

Bug: 67596257
Test: Simulator
PiperOrigin-RevId: 185920527
Change-Id: I51016fa6cf1ccc8a5a21335f9dacf286ae393706

1 files changed, 11 insertions, 1 deletions

diff --git a/java/com/android/incallui/rtt/impl/RttChatAdapter.java b/java/com/android/incallui/rtt/impl/RttChatAdapter.java
index 1ea7f31b1..69837188a 100644
--- a/java/com/android/incallui/rtt/impl/RttChatAdapter.java
+++ b/java/com/android/incallui/rtt/impl/RttChatAdapter.java
@@ -110,7 +110,17 @@ public class RttChatAdapter extends RecyclerView.Adapter<RttChatMessageViewHolde
       notifyItemInserted(lastIndexOfLocalMessage);
     } else {
       rttChatMessage.append(newMessage);
-      notifyItemChanged(lastIndexOfLocalMessage);
+      // Clear empty message bubble.
+      if (TextUtils.isEmpty(rttChatMessage.getContent())) {
+        rttMessages.remove(lastIndexOfLocalMessage);
+        notifyItemRemoved(lastIndexOfLocalMessage);
+        if (lastIndexOfRemoteMessage > lastIndexOfLocalMessage) {
+          lastIndexOfRemoteMessage -= 1;
+        }
+        lastIndexOfLocalMessage = -1;
+      } else {
+        notifyItemChanged(lastIndexOfLocalMessage);
+      }
     }
   }