diff --git a/Code/LeudaemiaLikeMe/app/src/main/AndroidManifest.xml b/Code/LeudaemiaLikeMe/app/src/main/AndroidManifest.xml
index cd877d1..e8312a5 100644
--- a/Code/LeudaemiaLikeMe/app/src/main/AndroidManifest.xml
+++ b/Code/LeudaemiaLikeMe/app/src/main/AndroidManifest.xml
@@ -9,8 +9,9 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.LeudaemiaLikeMe">
-        <activity android:name=".Activity.SendInvitationActivity"></activity>
-        <activity android:name=".Activity.GoAnswerActivity"></activity>
+        <activity android:name=".Activity.CommunityActivity"></activity>
+        <activity android:name=".Activity.SendInvitationActivity" />
+        <activity android:name=".Activity.GoAnswerActivity" />
         <activity android:name=".Activity.SendQuestionActivity" />
         <activity android:name=".Activity.MainActivity">
             <intent-filter>
diff --git a/Code/LeudaemiaLikeMe/app/src/main/java/com/example/leudaemialikeme/Adapter/InvitationPageFragmentAdapter.java b/Code/LeudaemiaLikeMe/app/src/main/java/com/example/leudaemialikeme/Adapter/InvitationPageFragmentAdapter.java
new file mode 100644
index 0000000..55644c5
--- /dev/null
+++ b/Code/LeudaemiaLikeMe/app/src/main/java/com/example/leudaemialikeme/Adapter/InvitationPageFragmentAdapter.java
@@ -0,0 +1,30 @@
+package com.example.leudaemialikeme.Adapter;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentPagerAdapter;
+
+import com.example.leudaemialikeme.Fragment.InvitationChannelFragment;
+
+public class InvitationPageFragmentAdapter extends FragmentPagerAdapter {
+    private String[] channelList;
+    private FragmentManager fm;
+    public InvitationPageFragmentAdapter(@NonNull FragmentManager fm, String[] channelList) {
+        super(fm);
+        this.channelList = channelList;
+        this.fm = fm;
+    }
+
+    @NonNull
+    @Override
+    public Fragment getItem(int position) {
+        String InvitationCategoryTitle = channelList[position];
+        return InvitationChannelFragment.newInstance(InvitationCategoryTitle);
+    }
+
+    @Override
+    public int getCount() {
+        return channelList.length;
+    }
+}
diff --git a/Code/LeudaemiaLikeMe/app/src/main/java/com/example/leudaemialikeme/Fragment/CommunityFragment.java b/Code/LeudaemiaLikeMe/app/src/main/java/com/example/leudaemialikeme/Fragment/CommunityFragment.java
index 846cc53..414a171 100644
--- a/Code/LeudaemiaLikeMe/app/src/main/java/com/example/leudaemialikeme/Fragment/CommunityFragment.java
+++ b/Code/LeudaemiaLikeMe/app/src/main/java/com/example/leudaemialikeme/Fragment/CommunityFragment.java
@@ -1,65 +1,107 @@
 package com.example.leudaemialikeme.Fragment;
 
 import android.os.Bundle;
+import android.util.DisplayMetrics;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.HorizontalScrollView;
+import android.widget.RadioButton;
+import android.widget.RadioGroup;
 
 import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.viewpager.widget.ViewPager;
 
+import com.example.leudaemialikeme.Adapter.InvitationPageFragmentAdapter;
 import com.example.leudaemialikeme.R;
 
-/**
- * A simple {@link Fragment} subclass.
- * Use the {@link CommunityFragment#newInstance} factory method to
- * create an instance of this fragment.
- */
-public class CommunityFragment extends Fragment {
-
-    // TODO: Rename parameter arguments, choose names that match
-    // the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
-    private static final String ARG_PARAM1 = "param1";
-    private static final String ARG_PARAM2 = "param2";
-
-    // TODO: Rename and change types of parameters
-    private String mParam1;
-    private String mParam2;
+public class CommunityFragment extends Fragment implements ViewPager.OnPageChangeListener {
+    private static final String ARG_CHANNEL_LIST = "channel_list";
+    private View view=null; // 碎片的布局实例
+    private ViewPager viewPager; //内导航的碎片的容器
+    private RadioGroup rgChannel=null; // 内导航由单选按钮组构成
+    private HorizontalScrollView hvChannel=null; //单选按钮组可滚动动
+    private String[] channelList = {"关注","全部","经验","扫雷","康复","科普","问答"}; //默认的内导航栏目
+    private InvitationPageFragmentAdapter adapter; //viewPager 的适配器
 
     public CommunityFragment() {
         // Required empty public constructor
     }
 
-    /**
-     * Use this factory method to create a new instance of
-     * this fragment using the provided parameters.
-     *
-     * @param param1 Parameter 1.
-     * @param param2 Parameter 2.
-     * @return A new instance of fragment CommunityFragment.
-     */
-    // TODO: Rename and change types and number of parameters
-    public static CommunityFragment newInstance(String param1, String param2) {
-        CommunityFragment fragment = new CommunityFragment();
-        Bundle args = new Bundle();
-        args.putString(ARG_PARAM1, param1);
-        args.putString(ARG_PARAM2, param2);
-        fragment.setArguments(args);
-        return fragment;
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        if(view==null){
+            view=inflater.inflate(R.layout.fragment_community, container, false);
+            viewPager=(ViewPager)view.findViewById(R.id.vpNewsList);
+            initViewPager(); //设置 ViewPager
+
+            rgChannel=(RadioGroup)view.findViewById(R.id.rgChannel);
+            hvChannel=(HorizontalScrollView)view.findViewById(R.id.hvChannel);
+            initTab(inflater);
+
+            rgChannel.setOnCheckedChangeListener(
+                    new RadioGroup.OnCheckedChangeListener() {
+                        @Override
+                        public void onCheckedChanged(RadioGroup group, int checkedId) {
+                            viewPager.setCurrentItem(checkedId);
+                        }
+                    }
+            );
+        }
+        return view;
     }
 
-    @Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        if (getArguments() != null) {
-            mParam1 = getArguments().getString(ARG_PARAM1);
-            mParam2 = getArguments().getString(ARG_PARAM2);
+    private void initTab(LayoutInflater inflater) {
+        for(int i=0;i<channelList.length;i++){
+            RadioButton rb=(RadioButton)inflater.inflate(R.layout.invitation_tab_rb,null);
+            rb.setId(i);
+            rb.setText(channelList[i]);
+            RadioGroup.LayoutParams params = new
+                    RadioGroup.LayoutParams(RadioGroup.LayoutParams.WRAP_CONTENT,
+                    RadioGroup.LayoutParams.WRAP_CONTENT);
+
+            rgChannel.addView(rb,params);
         }
+        rgChannel.check(0);
+    }
+
+    private void initViewPager() {
+        FragmentManager fragmentManager = super.getActivity().getSupportFragmentManager();
+        adapter=new InvitationPageFragmentAdapter(fragmentManager, channelList);
+//参数 channelList 将被适配器用来在动态切换碎片的时候实时创建碎片 //设置 ViewPager 的适配器
+        viewPager.setAdapter(adapter);
+        viewPager.setOffscreenPageLimit(2);
+        //设置显示第 1 个碎片
+        viewPager.setCurrentItem(1);
+        //设置 ViewPager 的切换监听
+        viewPager.addOnPageChangeListener(this);
     }
 
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container,
-                             Bundle savedInstanceState) {
-        // Inflate the layout for this fragment
-        return inflater.inflate(R.layout.fragment_community, container, false);
+    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+
+    }
+
+    @Override
+    public void onPageSelected(int position) {
+        setTab(position);
+    }
+
+    @Override
+    public void onPageScrollStateChanged(int state) {
+
+    }
+    private void setTab(int idx){
+        RadioButton rb=(RadioButton)rgChannel.getChildAt(idx);
+        rb.setChecked(true);
+        int left=rb.getLeft();
+        int width=rb.getMeasuredWidth();
+        DisplayMetrics metrics=new DisplayMetrics();
+        super.getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);
+        int screenWidth=metrics.widthPixels;
+        int len=left+width/2-screenWidth/2;
+        hvChannel.smoothScrollTo(len,0);
     }
 }
\ No newline at end of file
diff --git a/Code/LeudaemiaLikeMe/app/src/main/java/com/example/leudaemialikeme/Fragment/InvitationChannelFragment.java b/Code/LeudaemiaLikeMe/app/src/main/java/com/example/leudaemialikeme/Fragment/InvitationChannelFragment.java
new file mode 100644
index 0000000..cf8aa61
--- /dev/null
+++ b/Code/LeudaemiaLikeMe/app/src/main/java/com/example/leudaemialikeme/Fragment/InvitationChannelFragment.java
@@ -0,0 +1,49 @@
+package com.example.leudaemialikeme.Fragment;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import androidx.fragment.app.Fragment;
+
+import com.example.leudaemialikeme.R;
+
+public class InvitationChannelFragment extends Fragment {
+    private static final String ARG_CATEGORY_TITLE = "category_title";
+    private String invitationCategoryTitle = "Default";
+    private TextView mTitleField;
+
+    public InvitationChannelFragment() {
+        // Required empty public constructor
+    }
+
+    public static InvitationChannelFragment newInstance(String invitationCategoryTitle) {
+        InvitationChannelFragment fragment = new InvitationChannelFragment();
+        Bundle args = new Bundle();
+        args.putString(ARG_CATEGORY_TITLE,invitationCategoryTitle);
+        fragment.setArguments(args);
+        return fragment;
+    }
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        try{
+            invitationCategoryTitle = (String)getArguments().getString(ARG_CATEGORY_TITLE);
+        }catch (java.lang.NullPointerException e){
+            System.out.println("TesFragment getArg error!");
+        }
+    }
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        View view;
+        view = inflater.inflate(R.layout.fragment_invitation_channel, container, false);
+        mTitleField = (TextView)view.findViewById(R.id.invitationCategoryTitle);
+        mTitleField.setText(invitationCategoryTitle);
+        return view;
+    }
+}
\ No newline at end of file
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/drawable/invitation_tab_selector.xml b/Code/LeudaemiaLikeMe/app/src/main/res/drawable/invitation_tab_selector.xml
new file mode 100644
index 0000000..e13ce59
--- /dev/null
+++ b/Code/LeudaemiaLikeMe/app/src/main/res/drawable/invitation_tab_selector.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+      <item android:state_checked="true" >
+        <layer-list >
+            <item >
+                <shape android:shape="rectangle">
+                    <stroke android:width="5dp"  android:color="@color/hair_grey"/>
+                </shape>
+                
+            </item>
+             <item  android:bottom="5dp" >
+                <shape android:shape="rectangle" >
+           			 <solid android:color="#fff"/>
+       			 </shape>
+            </item>
+        </layer-list>
+        
+        
+    </item>
+    <item android:state_selected="true" >
+        <layer-list >
+            <item >
+                <shape android:shape="rectangle">
+                    <stroke android:width="5dp"  android:color="@color/hair_grey"/>
+                </shape>
+            </item>
+            <item  android:bottom="5dp" >
+                <shape android:shape="rectangle" >
+           			 <solid android:color="#fff"/>
+       			 </shape>
+            </item>
+
+        </layer-list>
+    </item>
+    <item >
+        <shape >
+            	<solid  android:color="#ffF"/>
+        </shape>
+    </item>
+
+</selector>
\ No newline at end of file
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/drawable/search_background.xml b/Code/LeudaemiaLikeMe/app/src/main/res/drawable/search_background.xml
new file mode 100644
index 0000000..f814595
--- /dev/null
+++ b/Code/LeudaemiaLikeMe/app/src/main/res/drawable/search_background.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <corners android:radius="25dp" />
+    <padding
+        android:bottom="3dp"
+        android:left="10dp"
+        android:right="5dp"
+        android:top="3dp" />
+    <stroke
+        android:width="2dp"
+        android:color="@color/light_grey"/>
+</shape>
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_go_answer.xml b/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_go_answer.xml
index 2c2756a..9c700f9 100644
--- a/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_go_answer.xml
+++ b/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_go_answer.xml
@@ -15,14 +15,12 @@
         android:padding="20dp"
         android:orientation="horizontal">
 
-        <TextView
-            android:id="@+id/textView2"
+        <ImageButton
             android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="<"
-            android:textSize="20dp"
-            android:textColor="#707070"/>
+            android:layout_height="18dp"
+            android:background="@mipmap/img_go_answer_return"
+            android:layout_marginRight="100dp"
+            />
 
         <TextView
             android:id="@+id/textView"
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_send_invitation.xml b/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_send_invitation.xml
index bcf06d4..3fd1c09 100644
--- a/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_send_invitation.xml
+++ b/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_send_invitation.xml
@@ -53,7 +53,7 @@ android:orientation="vertical"
         android:layout_width="match_parent"
         android:layout_height="42dp"
         android:ems="10"
-        android:maxlength="40"
+        android:maxLength="40"
         android:inputType="textPersonName"
         android:layout_margin="10dp"
         android:hint="请输入你的标题" />
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_send_question.xml b/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_send_question.xml
index 0a7e175..77fb769 100644
--- a/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_send_question.xml
+++ b/Code/LeudaemiaLikeMe/app/src/main/res/layout/activity_send_question.xml
@@ -53,7 +53,7 @@
             android:layout_width="match_parent"
             android:layout_height="42dp"
             android:ems="10"
-            android:maxlength="40"
+            android:maxLength="40"
             android:inputType="textPersonName"
             android:layout_margin="10dp"
             android:hint="请输入你的问题(10-40个字)" />
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/layout/fragment_community.xml b/Code/LeudaemiaLikeMe/app/src/main/res/layout/fragment_community.xml
index af6457d..d9c675a 100644
--- a/Code/LeudaemiaLikeMe/app/src/main/res/layout/fragment_community.xml
+++ b/Code/LeudaemiaLikeMe/app/src/main/res/layout/fragment_community.xml
@@ -3,12 +3,92 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:orientation="vertical"
     tools:context=".Fragment.CommunityFragment">
 
-    <!-- TODO: Update blank fragment layout -->
-    <TextView
+    <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:text="@string/hello_blank_fragment" />
+        android:orientation="vertical">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:layout_marginLeft="10dp"
+            android:layout_marginTop="10dp"
+            android:layout_marginRight="10dp"
+            android:orientation="horizontal">
+
+            <LinearLayout
+                android:layout_width="350dp"
+                android:layout_height="wrap_content"
+                android:background="@drawable/search_background"
+                android:orientation="horizontal">
+
+                <ImageView
+                    android:id="@+id/imageView5"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:src="@mipmap/img_search" />
+
+                <TextView
+                    android:id="@+id/textView3"
+                    android:layout_width="match_parent"
+                    android:layout_height="match_parent"
+                    android:gravity="center"
+                    android:text="搜索帖子" />
+            </LinearLayout>
+
+            <ImageButton
+                android:id="@+id/imageButton"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginLeft="10dp"
+                android:background="@color/white"
+                android:src="@mipmap/img_add" />
+
+        </LinearLayout>
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+
+            <RelativeLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="10dp">
+                <!-- 导航标签，包含一个单选按钮组-->
+                <!-- 任意数量不能显示时的缩略符号 -->
+                <HorizontalScrollView
+                    android:id="@+id/hvChannel"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:layout_toLeftOf="@+id/ivShowChannel"
+                    android:scrollbars="none">
+
+                    <RadioGroup
+                        android:id="@+id/rgChannel"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:orientation="horizontal" />
+                </HorizontalScrollView>
+
+                <ImageView
+                    android:id="@+id/ivShowChannel"
+                    android:layout_width="40dp"
+                    android:layout_height="40dp"
+                    android:layout_alignParentRight="true"
+                    android:scaleType="fitXY"
+                    android:src="@mipmap/channel_down_narrow" />
+            </RelativeLayout>
+        </LinearLayout>
+
+        <androidx.viewpager.widget.ViewPager
+            android:id="@+id/vpNewsList"
+            android:layout_width="match_parent"
+            android:layout_height="0dp" android:layout_weight="1"/>
+    </LinearLayout>
+
+
 
 </FrameLayout>
\ No newline at end of file
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/layout/fragment_invitation_channel.xml b/Code/LeudaemiaLikeMe/app/src/main/res/layout/fragment_invitation_channel.xml
new file mode 100644
index 0000000..1f97fb2
--- /dev/null
+++ b/Code/LeudaemiaLikeMe/app/src/main/res/layout/fragment_invitation_channel.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".Fragment.InvitationChannelFragment">
+
+    <!-- TODO: Update blank fragment layout -->
+    <TextView
+        android:id="@+id/invitationCategoryTitle"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:gravity="center"
+        android:textSize="30sp"
+        android:text="@string/hello_blank_fragment" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/layout/invitation_tab_rb.xml b/Code/LeudaemiaLikeMe/app/src/main/res/layout/invitation_tab_rb.xml
new file mode 100644
index 0000000..10097ec
--- /dev/null
+++ b/Code/LeudaemiaLikeMe/app/src/main/res/layout/invitation_tab_rb.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RadioButton xmlns:android="http://schemas.android.com/apk/res/android"
+		android:layout_width="wrap_content"
+		android:layout_height="30dp"
+		android:text=""
+		android:background="@drawable/invitation_tab_selector"
+		android:paddingLeft="15dp"
+		android:paddingRight="15dp"
+		android:paddingTop="10dp"
+		android:paddingBottom="10dp"
+		android:button="@null"
+/>
+
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-mdpi/img_add.png b/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-mdpi/img_add.png
new file mode 100644
index 0000000..d8e75f9
Binary files /dev/null and b/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-mdpi/img_add.png differ
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-mdpi/img_go_answer_return.png b/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-mdpi/img_go_answer_return.png
new file mode 100644
index 0000000..c5a2b98
Binary files /dev/null and b/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-mdpi/img_go_answer_return.png differ
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-mdpi/img_search.png b/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-mdpi/img_search.png
new file mode 100644
index 0000000..02a18c5
Binary files /dev/null and b/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-mdpi/img_search.png differ
diff --git a/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-xhdpi/channel_down_narrow.png b/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-xhdpi/channel_down_narrow.png
new file mode 100644
index 0000000..c2ce19f
Binary files /dev/null and b/Code/LeudaemiaLikeMe/app/src/main/res/mipmap-xhdpi/channel_down_narrow.png differ