修复android 首次加载问题。review by 孙凯

@@ -32,10 +32,14 @@ export default class Message extends Component {
     componentDidMount() {
           this.viewDidAppear = DeviceEventEmitter.addListener(
             'VCDidAppear',
-            () => {
+            () => {                
                  this.trigggePullToRefresh();
             }
         );
+
+        if(Platform.OS === 'android'){
+            this.trigggePullToRefresh();
+        }
     }
 
     trigggePullToRefresh() {