修复android 首次加载问题。review by 孙凯

@@ -36,6 +36,10 @@ export default class Message extends Component {
                  this.trigggePullToRefresh();
                  this.trigggePullToRefresh();
             }
             }
         );
         );
+
+        if(Platform.OS === 'android'){
+            this.trigggePullToRefresh();
+        }
     }
     }
 
 
     trigggePullToRefresh() {
     trigggePullToRefresh() {