fragment重复创建问题修复

m-im/src/main/java/com/yidianling/uikit/business/session/activity/YDLP2PMessageActivity.java

@@ -190,10 +190,12 @@ public class YDLP2PMessageActivity extends YDLBaseMessageActivity {
     protected YDLMessageFragment fragment() {
         Bundle arguments = getIntent().getExtras();
         arguments.putSerializable(Extras.EXTRA_TYPE, SessionTypeEnum.P2P);
-        YDLMessageFragment fragment = new YDLMessageFragment();
-        fragment.setArguments(arguments);
-        fragment.setContainerId(R.id.message_fragment_container);
-        return fragment;
+        if (messageFragment==null){
+            messageFragment = new YDLMessageFragment();
+            messageFragment.setArguments(arguments);
+            messageFragment.setContainerId(R.id.message_fragment_container);
+        }
+        return messageFragment;
     }
 
     @Override