增加android 下拉刷新。review by 于良。

@@ -23,6 +23,7 @@ import LoadingIndicator from '../../../common/components/LoadingIndicator';
 import IndexListView from './IndexListView';
 import {ScrollCount} from '../../utils/Utils';
 import NoNetworkTip from '../../../common/components/NoNetworkTip';
+import YH_PtrRefresh from '../../../common/components/YH_PtrRefresh';
 
 export default class Brand extends Component {
     constructor(props) {
@@ -235,6 +236,8 @@ export default class Brand extends Component {
             <View style={styles.container}>
                 <ChannelSelector selectedChannelId={selectedChannelId} onSelectChannel={this.props.onSelectChannel}/>
 
+                {
+                    Platform.OS === 'ios' ?
                         <ListView
                             ref={(ref)=>this.listView=ref}
                             initialListSize={initialListSize}
@@ -251,6 +254,29 @@ export default class Brand extends Component {
                                 this.props.onRefresh && this.props.onRefresh();
                             }}
                         />
+                    :
+                        <ListView
+                            ref={(ref)=>this.listView=ref}
+                            initialListSize={initialListSize}
+                            contentContainerStyle={contentContainerStyle}
+                            enableEmptySections={true}
+                            dataSource={listDataSource}
+                            renderRow={this.renderRow}
+                            showsVerticalScrollIndicator={showsVerticalScrollIndicator}
+                            renderSectionHeader={renderSectionHeader}
+                            renderHeader={this.renderHeader}
+                            enablePullToRefresh={true}
+                            isOnPullToRefresh={isPullToRefresh}
+                            refreshControl={
+                                <YH_PtrRefresh
+                                    refreshing={isPullToRefresh}
+                                    onRefresh={() => {
+                                        this.props.onRefresh && this.props.onRefresh();
+                                    }}
+                                />
+                            }
+                        />
+                }
 
                 {showIndexForListView ? <IndexListView dataSource={list.keySeq().toArray()} onLetterPress={this.scrollToSection}/> : null}