Do not throw IOException from RttCall.read()

Modify the signature of read() to no longer throw an IOException

Change-Id: Ib5a1d8615a4bd66716a54c53865a2d560f33de83
Test: builds
Fixes: 63769529
diff --git a/telecomm/java/android/telecom/Call.java b/telecomm/java/android/telecom/Call.java
index c1289d3..e13bd61 100644
--- a/telecomm/java/android/telecom/Call.java
+++ b/telecomm/java/android/telecom/Call.java
@@ -1089,12 +1089,17 @@
          * @return A string containing text sent by the remote user, or {@code null} if the
          * conversation has been terminated or if there was an error while reading.
          */
-        public String read() throws IOException {
-            int numRead = mReceiveStream.read(mReadBuffer, 0, READ_BUFFER_SIZE);
-            if (numRead < 0) {
+        public String read() {
+            try {
+                int numRead = mReceiveStream.read(mReadBuffer, 0, READ_BUFFER_SIZE);
+                if (numRead < 0) {
+                    return null;
+                }
+                return new String(mReadBuffer, 0, numRead);
+            } catch (IOException e) {
+                Log.w(this, "Exception encountered when reading from InputStreamReader: %s", e);
                 return null;
             }
-            return new String(mReadBuffer, 0, numRead);
         }
 
         /**
@@ -1105,7 +1110,11 @@
          */
         public String readImmediately() throws IOException {
             if (mReceiveStream.ready()) {
-                return read();
+                int numRead = mReceiveStream.read(mReadBuffer, 0, READ_BUFFER_SIZE);
+                if (numRead < 0) {
+                    return null;
+                }
+                return new String(mReadBuffer, 0, numRead);
             } else {
                 return null;
             }