安卓滑动卡顿问题。

@@ -367,14 +367,15 @@ export default class NewArrival extends Component {
                     }}
                     }}
                     scrollEventThrottle={300}
                     scrollEventThrottle={300}
                     initialListSize={40}
                     initialListSize={40}
-                    onScroll={(event) => {
-                        if (this.state.showBackToTopButton && event.nativeEvent.contentOffset.y < height) {
-                            this.setState({showBackToTopButton: false});
-                        }
-                        if (this.state.showBackToTopButton == false && event.nativeEvent.contentOffset.y > height) {
-                            this.setState({showBackToTopButton: true});
-                        }
-                     }}
+
+                     onScrollEndDrag={(event) => {
+                         if (this.state.showBackToTopButton && event.nativeEvent.contentOffset.y < height) {
+                             this.setState({showBackToTopButton: false});
+                         }
+                         if (this.state.showBackToTopButton == false && event.nativeEvent.contentOffset.y > height) {
+                             this.setState({showBackToTopButton: true});
+                         }
+                      }}
                 />
                 />
                 {productList.isFilter ?
                 {productList.isFilter ?
                     <NewArrivalCategoryList
                     <NewArrivalCategoryList
@@ -400,6 +401,7 @@ export default class NewArrival extends Component {
                     style={styles.backToTopButton}
                     style={styles.backToTopButton}
                     onPress={()=>{
                     onPress={()=>{
                         this.listView && this.listView.scrollTo({x: 0, y: 0, animated: true});
                         this.listView && this.listView.scrollTo({x: 0, y: 0, animated: true});
+                        this.setState({showBackToTopButton: false});
                     }}>
                     }}>
                         <Image style={{flex:1}} source={require('../../image/backtop.png')}/>
                         <Image style={{flex:1}} source={require('../../image/backtop.png')}/>
                     </TouchableOpacity>: null
                     </TouchableOpacity>: null