diff --git a/README.md b/README.md
index 415d16d..dceaa97 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 哟慕课 APP 是一个第三方的优慕课客户端
 
-![screenshot](./screenshot.jpg)
+<img src="./screenshot.jpg" alt="screenshot" style="height:500px;" />
 
 ## 🎞 背景
 
@@ -18,9 +18,9 @@
 
 ## 📄 TODO
 
-- [ ] 弹出键盘不遮挡输入框
-- [ ] 根据像素比例设置登录背景图片大小
-- [ ] 添加应用图标
+- [x] 弹出键盘不遮挡输入框
+- [ ] ~~根据像素比例设置登录背景图片大小~~
+- [x] 添加应用图标
 - [ ] 适配 iOS 登录失败 toast
 - [ ] 在启动时检测是否已登录
 - [ ] Splash 检测网络出错后在 Splash UI 中显示错误并不跳转
@@ -29,5 +29,6 @@
 - [ ] 解决当动画进行时点击话题标题动画会被打断的问题
 - [ ] 支持显示回复图片
 - [ ] 在回复中显示头像
-- [ ] 当滑动到页面底部时显示"加载更多"
+- [x] 当滑动到页面底部时显示"加载更多"
+- [x] 支持通过 Android BackHandler 从话题详情返回话题列表
 
diff --git a/src/component/YooForum.js b/src/component/YooForum.js
index 521d21c..458c0bb 100644
--- a/src/component/YooForum.js
+++ b/src/component/YooForum.js
@@ -14,6 +14,8 @@ export default class YooForum extends Component {
     this.state = {
       hint: '准备中',
       topics: [],
+      fetchedListPage: 0,
+      gettingTopicList: false,
     };
     this.initForum = this.initForum.bind(this);
     this.getTopicList = this.getTopicList.bind(this);
@@ -87,9 +89,7 @@ export default class YooForum extends Component {
                       'http://eol.ctbu.edu.cn/meol/jpk/course/layout/newpage/index.jsp?courseId=46445',
                   },
                 )
-                  .then(() => {
-                    this.getTopicList();
-                  })
+                  .then(this.getTopicList)
                   .catch(ShowErrorToast);
               })
               .catch(ShowErrorToast);
@@ -101,8 +101,10 @@ export default class YooForum extends Component {
       .catch(ShowErrorToast);
   }
 
-  getTopicList(page = 1) {
-    this.setState({hint: '获取数据中'});
+  getTopicList() {
+    const page = this.state.fetchedListPage + 1;
+    page === 1 && this.setState({hint: '获取数据中'});
+    this.setState({gettingTopicList: true});
     gbkFetch(
       'GET',
       `http://eol.ctbu.edu.cn/meol/common/faq/forum.jsp?viewtype=thread&forumid=102211&cateId=0&s_gotopage=${page}`,
@@ -128,11 +130,23 @@ export default class YooForum extends Component {
           current.next().text(),
         );
       });
-      this.setState({topics: [...this.state.topics, ...newTopics], hint: ''});
+      this.setState({
+        topics: [...this.state.topics, ...newTopics],
+        hint: '',
+        fetchedListPage: page,
+        gettingTopicList: false,
+      });
     });
   }
 
   render() {
-    return <YooForumUI topics={this.state.topics} hint={this.state.hint} />;
+    return (
+      <YooForumUI
+        topics={this.state.topics}
+        hint={this.state.hint}
+        getTopicList={this.getTopicList}
+        gettingTopicList={this.state.gettingTopicList}
+      />
+    );
   }
 }
diff --git a/src/ui/YooBackground.js b/src/ui/YooBackground.js
index df8a9a6..ae44fbf 100644
--- a/src/ui/YooBackground.js
+++ b/src/ui/YooBackground.js
@@ -10,6 +10,17 @@ export default function YooBackground() {
       zIndex: -1,
     },
   });
+  // The animation won't play for the first 10 seconds
+  // if we just use setInterval. So we start the animation
+  // at the component mounted just for the first 10 seconds.
+  Animated.timing(imgPosition, {
+    toValue: {
+      x: -Math.floor(Math.random() * 5000),
+      y: -Math.floor(Math.random() * 3000),
+    },
+    duration: 10000,
+    useNativeDriver: true,
+  }).start();
   setInterval(() => {
     Animated.timing(imgPosition, {
       toValue: {
diff --git a/src/ui/YooForumTopicUI.js b/src/ui/YooForumTopicUI.js
index ef8e4ef..183df9b 100644
--- a/src/ui/YooForumTopicUI.js
+++ b/src/ui/YooForumTopicUI.js
@@ -32,6 +32,7 @@ export default class YooForumTopicUI extends Component {
     this.state = {
       detailShowing: false,
       layoutY: 0,
+      layoutHeight: 0,
       translate: new Animated.ValueXY({x: 0, y: 0}),
     };
     this.topicHeaderRef = createRef();
@@ -45,14 +46,9 @@ export default class YooForumTopicUI extends Component {
 
   onPress() {
     if (!this.state.detailShowing) {
-      this.props.showDetail(
-        this.state.translate,
-        this.state.layoutY,
-        this.onAnimationFinished,
-        this.props.replies,
-      );
+      this.props.showDetail(this);
     } else {
-      this.props.hideDetail(this.state.translate, this.onAnimationFinished);
+      this.props.hideDetail();
     }
   }
 
@@ -65,7 +61,10 @@ export default class YooForumTopicUI extends Component {
         ]}
         onPress={this.onPress}
         onLayout={(event) => {
-          this.setState({layoutY: event.nativeEvent.layout.y});
+          this.setState({
+            layoutY: event.nativeEvent.layout.y,
+            layoutHeight: event.nativeEvent.layout.height,
+          });
         }}>
         <View ref={this.topicHeaderRef}>
           <Text style={styles.owner}>{this.props.topic.owner}</Text>
diff --git a/src/ui/YooForumUI.js b/src/ui/YooForumUI.js
index 5c91e20..053de93 100644
--- a/src/ui/YooForumUI.js
+++ b/src/ui/YooForumUI.js
@@ -8,6 +8,9 @@ import {
   Image,
   Animated,
   Dimensions,
+  Pressable,
+  BackHandler,
+  ToastAndroid,
 } from 'react-native';
 import YooForumTopic from '../component/YooForumTopic';
 import YooReply from './YooReply';
@@ -43,8 +46,37 @@ const styles = StyleSheet.create({
   indicator: {
     marginTop: 64,
   },
+  showMoreText: {
+    fontSize: 18,
+    margin: 8,
+  },
 });
 
+function ForumTopic(props) {
+  return props.topics.map((topic, key) => (
+    <YooForumTopic
+      key={key}
+      topic={topic}
+      showDetail={props.showDetail}
+      hideDetail={props.hideDetail}
+    />
+  ));
+}
+
+function ShowMore(props) {
+  return (
+    <Pressable
+      style={{width: screenWidth, alignItems: 'center'}}
+      onPress={() => props.getTopicList()}>
+      {props.gettingTopicList ? (
+        <Text style={styles.showMoreText}>加载中</Text>
+      ) : (
+        <Text style={styles.showMoreText}>加载更多</Text>
+      )}
+    </Pressable>
+  );
+}
+
 export default class YooForumUI extends Component {
   constructor(props) {
     super(props);
@@ -54,26 +86,55 @@ export default class YooForumUI extends Component {
       translateX: new Animated.Value(0),
       currentReplies: [],
       replyTranslateY: new Animated.Value(0),
+      lastPressingBack: 0,
     };
     this.replyRef = createRef();
     this.showDetail = this.showDetail.bind(this);
     this.hideDetail = this.hideDetail.bind(this);
+    this.handleAndroidBack = this.handleAndroidBack.bind(this);
+    this.currentForumTopicUI = null;
   }
 
-  showDetail(translate, layoutY, onAnimationFinished, replies) {
+  componentDidMount() {
+    this.backHandler = BackHandler.addEventListener(
+      'hardwareBackPress',
+      this.handleAndroidBack,
+    );
+  }
+
+  handleAndroidBack() {
+    if (this.currentForumTopicUI) {
+      this.hideDetail();
+      return true;
+    } else if (new Date().getTime() - this.state.lastPressingBack <= 1000) {
+      BackHandler.exitApp();
+    } else {
+      this.setState({lastPressingBack: new Date().getTime()});
+      ToastAndroid.show('再按一次以退出Yoomooc', ToastAndroid.SHORT);
+      return true;
+    }
+  }
+
+  showDetail(ForumTopicUI) {
+    this.currentForumTopicUI = ForumTopicUI;
     this.replyRef.current.scrollTo({x: 0, y: 0, animated: false});
     this.setState({
       scrollEnabled: false,
-      currentReplies: replies,
+      currentReplies: this.currentForumTopicUI.props.replies,
     });
     this.state.replyTranslateY.setValue(
-      this.state.currentPosition + 100 + screenHeight,
+      this.state.currentPosition +
+        this.currentForumTopicUI.state.layoutHeight +
+        screenHeight,
     );
     Animated.parallel([
-      Animated.timing(translate, {
+      Animated.timing(this.currentForumTopicUI.state.translate, {
         toValue: {
           x: screenWidth,
-          y: this.state.currentPosition - layoutY + 8,
+          y:
+            this.state.currentPosition -
+            this.currentForumTopicUI.state.layoutY +
+            8,
         },
         duration: 250,
         useNativeDriver: true,
@@ -84,18 +145,21 @@ export default class YooForumUI extends Component {
         useNativeDriver: true,
       }),
       Animated.timing(this.state.replyTranslateY, {
-        toValue: this.state.currentPosition + 100,
+        toValue:
+          this.state.currentPosition +
+          this.currentForumTopicUI.state.layoutHeight +
+          8,
         duration: 250,
         delay: 250,
         useNativeDriver: true,
       }),
-    ]).start(onAnimationFinished);
+    ]).start(this.currentForumTopicUI.onAnimationFinished);
   }
 
-  hideDetail(translate, onAnimationFinished) {
+  hideDetail() {
     this.setState({scrollEnabled: true});
     Animated.parallel([
-      Animated.timing(translate, {
+      Animated.timing(this.currentForumTopicUI.state.translate, {
         toValue: {
           x: 0,
           y: 0,
@@ -113,7 +177,12 @@ export default class YooForumUI extends Component {
         duration: 250,
         useNativeDriver: true,
       }),
-    ]).start(onAnimationFinished);
+    ]).start(
+      function () {
+        this.currentForumTopicUI.onAnimationFinished();
+        this.currentForumTopicUI = null;
+      }.bind(this),
+    );
   }
 
   render() {
@@ -134,14 +203,17 @@ export default class YooForumUI extends Component {
           this.setState({currentPosition: event.nativeEvent.contentOffset.y})
         }>
         {this.props.hint === '' ? (
-          this.props.topics.map((topic, key) => (
-            <YooForumTopic
-              key={key}
-              topic={topic}
+          <View>
+            <ForumTopic
+              topics={this.props.topics}
               showDetail={this.showDetail}
               hideDetail={this.hideDetail}
             />
-          ))
+            <ShowMore
+              getTopicList={this.props.getTopicList}
+              gettingTopicList={this.props.gettingTopicList}
+            />
+          </View>
         ) : (
           <View style={styles.hintContainer}>
             <Image
diff --git a/src/ui/YooLoginUI.js b/src/ui/YooLoginUI.js
index 2bb6132..0989653 100644
--- a/src/ui/YooLoginUI.js
+++ b/src/ui/YooLoginUI.js
@@ -8,6 +8,8 @@ import {
   Text,
   ActivityIndicator,
   ToastAndroid,
+  Animated,
+  Keyboard,
 } from 'react-native';
 
 const styles = StyleSheet.create({
@@ -45,15 +47,37 @@ const styles = StyleSheet.create({
     fontSize: 26,
   },
 });
+const AnimatedInput = Animated.createAnimatedComponent(TextInput);
+const AnimatedImage = Animated.createAnimatedComponent(Image);
+const AnimatedTouchableOpacity = Animated.createAnimatedComponent(TouchableOpacity);
 
 export default class YooLoginUI extends Component {
   constructor(props) {
     super(props);
     this.state = {
       loading: false,
+      translateY: new Animated.Value(0),
     };
     this.onButtonPress = this.onButtonPress.bind(this);
     this.onLoginFailed = this.onLoginFailed.bind(this);
+    this.onKeyboardDidShow = this.onKeyboardDidShow.bind(this);
+    this.onKeyboardDidHide = this.onKeyboardDidHide.bind(this);
+  }
+
+  componentDidMount() {
+    this.keyboardDidShowListener = Keyboard.addListener(
+      'keyboardDidShow',
+      this.onKeyboardDidShow,
+    );
+    this.keyboardDidHideListener = Keyboard.addListener(
+      'keyboardDidHide',
+      this.onKeyboardDidHide,
+    );
+  }
+
+  componentWillUnmount() {
+    this.keyboardDidShowListener.remove();
+    this.keyboardDidHideListener.remove();
   }
 
   onButtonPress() {
@@ -68,31 +92,64 @@ export default class YooLoginUI extends Component {
     ToastAndroid.show(hint, ToastAndroid.SHORT);
   }
 
+  onKeyboardDidShow() {
+    Animated.timing(this.state.translateY, {
+      toValue: -320,
+      duration: 250,
+      useNativeDriver: true,
+    }).start();
+  }
+
+  onKeyboardDidHide() {
+    Animated.timing(this.state.translateY, {
+      toValue: 0,
+      duration: 250,
+      useNativeDriver: true,
+    }).start();
+  }
+
   render() {
     return (
       <View style={styles.container}>
-        <Image source={require('../../assets/icon.png')} style={styles.logo} />
-        <TextInput
-          style={styles.input}
+        <AnimatedImage
+          source={require('../../assets/icon.png')}
+          style={[
+            styles.logo,
+            {transform: [{translateY: this.state.translateY}]},
+          ]}
+        />
+        <AnimatedInput
+          style={[
+            styles.input,
+            {transform: [{translateY: this.state.translateY}]},
+          ]}
           placeholder={'账号'}
           maxLength={10}
           value={this.props.username}
           onChangeText={(username) => this.props.setUsername(username)}
         />
-        <TextInput
-          style={styles.input}
+        <AnimatedInput
+          style={[
+            styles.input,
+            {transform: [{translateY: this.state.translateY}]},
+          ]}
           placeholder={'密码'}
           secureTextEntry={true}
           value={this.props.password}
           onChangeText={(password) => this.props.setPassword(password)}
         />
-        <TouchableOpacity style={styles.button} onPress={this.onButtonPress}>
+        <AnimatedTouchableOpacity
+          style={[
+            styles.button,
+            {transform: [{translateY: this.state.translateY}]},
+          ]}
+          onPress={this.onButtonPress}>
           {this.state.loading ? (
             <ActivityIndicator size="large" color="#00ff00" />
           ) : (
             <Text style={styles.buttonText}>登录</Text>
           )}
-        </TouchableOpacity>
+        </AnimatedTouchableOpacity>
       </View>
     );
   }