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, 8 insertions, 1 deletions

diff --git a/java/com/android/incallui/call/DialerCall.java b/java/com/android/incallui/call/DialerCall.java
index 378806183..90a01401c 100644
--- a/java/com/android/incallui/call/DialerCall.java
+++ b/java/com/android/incallui/call/DialerCall.java
@@ -939,6 +939,14 @@ public class DialerCall implements VideoTechListener, StateChangedListener, Capa
     }
   }
 
+  @TargetApi(28)
+  public RttCall getRttCall() {
+    if (!isRttCall()) {
+      return null;
+    }
+    return getTelecomCall().getRttCall();
+  }
+
   public boolean hasReceivedVideoUpgradeRequest() {
     return VideoUtils.hasReceivedVideoUpgradeRequest(getVideoTech().getSessionModificationState());
   }
@@ -948,7 +956,6 @@ public class DialerCall implements VideoTechListener, StateChangedListener, Capa
   }
 
   public boolean hasSentRttUpgradeRequest() {
-    // TODO(wangqi): Implement this.
     return false;
   }