[Modify]消息頁面邏輯

app/src/main/java/com/yizhuan/erban/ui/im/MessageListPanelEx.java

@@ -309,6 +309,13 @@ public class MessageListPanelEx {
         initFetchLoadListener(anchor);
         messageListView.setAdapter(adapter);
         messageListView.addOnItemTouchListener(listener);
+
+        messageListView.postDelayed(new Runnable() {
+            @Override
+            public void run() {
+                messageListView.smoothScrollToPosition(0);
+            }
+        },3000);
     }
 
     public boolean isSessionMode() {

nim_uikit/src/com/netease/nim/uikit/business/session/viewholder/MsgViewHolderBase.java

@@ -379,9 +379,13 @@ public abstract class MsgViewHolderBase extends RecyclerViewHolder<BaseMultiItem
             if (isReceivedMessage()) {
                 setGravity(bodyContainer, Gravity.LEFT);
                 contentContainer.setBackgroundResource(leftBackground());
+                contentContainer.setAlpha(0);
+                contentContainer.animate().alpha(1f).setDuration(2000).start();
             } else {
                 setGravity(bodyContainer, Gravity.RIGHT);
                 contentContainer.setBackgroundResource(rightBackground());
+                contentContainer.setAlpha(0);
+                contentContainer.animate().alpha(1f).setDuration(2000).start();
             }
         }
     }