FiX

app/src/main/java/com/example/chatclient/MainActivity.java

@@ -18,14 +18,11 @@ public class MainActivity extends AppCompatActivity implements Callback {
     Client client;
 
     @Override
-    public void RecvMessage(String msg) {
-
-        final String m = msg;
-
+    public void RecvMessage(final String msg) {
         runOnUiThread(new Runnable() {
             @Override
             public void run() {
-                textView2.setText(m);
+                textView2.setText(msg);
             }
         });
     }