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

Author: Hall Liu

api/current.txt

@@ -38870,7 +38870,7 @@ package android.telecom {
 
   public static final class Call.RttCall {
     method public int getRttAudioMode();
-    method public java.lang.String read() throws java.io.IOException;
+    method public java.lang.String read();
     method public java.lang.String readImmediately() throws java.io.IOException;
     method public void setRttMode(int);
     method public void write(java.lang.String) throws java.io.IOException;

api/system-current.txt

@@ -42226,7 +42226,7 @@ package android.telecom {
 
   public static final class Call.RttCall {
     method public int getRttAudioMode();
-    method public java.lang.String read() throws java.io.IOException;
+    method public java.lang.String read();
     method public java.lang.String readImmediately() throws java.io.IOException;
     method public void setRttMode(int);
     method public void write(java.lang.String) throws java.io.IOException;

api/test-current.txt

@@ -39105,7 +39105,7 @@ package android.telecom {
 
   public static final class Call.RttCall {
     method public int getRttAudioMode();
-    method public java.lang.String read() throws java.io.IOException;
+    method public java.lang.String read();
     method public java.lang.String readImmediately() throws java.io.IOException;
     method public void setRttMode(int);
     method public void write(java.lang.String) throws java.io.IOException;

telecomm/java/android/telecom/Call.java

@@ -1089,12 +1089,17 @@ public void write(String input) throws IOException {
          * @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 read() throws IOException {
          */
         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;
             }