feat: support go back to topic list by Android back action

README.md

@@ -30,5 +30,5 @@
 - [ ] 支持显示回复图片
 - [ ] 在回复中显示头像
 - [x] 当滑动到页面底部时显示"加载更多"
-- [ ] 支持通过 Android BackHandler 从话题详情返回话题列表
+- [x] 支持通过 Android BackHandler 从话题详情返回话题列表
 

src/ui/YooForumUI.js

@@ -9,6 +9,7 @@ import {
   Animated,
   Dimensions,
   Pressable,
+  BackHandler,
 } from 'react-native';
 import YooForumTopic from '../component/YooForumTopic';
 import YooReply from './YooReply';
@@ -88,9 +89,24 @@ export default class YooForumUI extends Component {
     this.replyRef = createRef();
     this.showDetail = this.showDetail.bind(this);
     this.hideDetail = this.hideDetail.bind(this);
+    this.handleAndroidBack = this.handleAndroidBack.bind(this);
     this.currentForumTopicUI = null;
   }
 
+  componentDidMount() {
+    this.backHandler = BackHandler.addEventListener(
+      'hardwareBackPress',
+      this.handleAndroidBack,
+    );
+  }
+
+  handleAndroidBack() {
+    if (this.currentForumTopicUI){
+      this.hideDetail();
+      return true;
+    }
+  }
+
   showDetail(ForumTopicUI) {
     this.currentForumTopicUI = ForumTopicUI;
     this.replyRef.current.scrollTo({x: 0, y: 0, animated: false});