增加数据库类，使用了自带的数据库，可以在侧滑拦显示用户与角色

app/build.gradle

@@ -28,6 +28,7 @@ dependencies {
     implementation 'androidx.navigation:navigation-fragment:2.0.0'
     implementation 'androidx.navigation:navigation-ui:2.0.0'
     implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
+    implementation 'androidx.recyclerview:recyclerview:1.0.0'
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'
     androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

app/src/main/AndroidManifest.xml

@@ -2,7 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="hunnu.sj.raise_money">
 
-    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.INTERNET" />
+
     <application
         android:allowBackup="true"
         android:icon="@drawable/img_2"
@@ -10,7 +11,8 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".RegiteActivity"></activity>
+        <activity android:name=".NewsContentActivity"></activity>
+        <activity android:name=".RegiteActivity" />
         <activity android:name=".SignInActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -22,6 +24,7 @@
         <activity
             android:name=".MainActivity"
             android:label="@string/app_name"
-            android:theme="@style/AppTheme.NoActionBar"></activity>
+            android:theme="@style/AppTheme.NoActionBar" />
     </application>
+
 </manifest>

app/src/main/java/hunnu/sj/raise_money/News.java

@@ -0,0 +1,18 @@
+package hunnu.sj.raise_money;
+
+public class News {
+    private String title;
+    private String content;
+    public String getTitle() {
+        return title;
+    }
+    public void setTitle(String title) {
+        this.title = title;
+    }
+    public String getContent() {
+        return content;
+    }
+    public void setContent(String content) {
+        this.content = content;
+    }
+}

app/src/main/java/hunnu/sj/raise_money/NewsAdapter.java

@@ -0,0 +1,31 @@
+package hunnu.sj.raise_money;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.TextView;
+
+import java.util.List;
+
+public class NewsAdapter extends ArrayAdapter<News> {
+    private int resourceId;
+    public NewsAdapter(Context context, int textViewResourceId, List<News> objects) {
+        super(context, textViewResourceId, objects);
+        resourceId = textViewResourceId;
+    }
+    @Override
+    public View getView(int position, View convertView, ViewGroup parent) {
+        News news = getItem(position);
+        View view;
+        if (convertView == null) {
+            view = LayoutInflater.from(getContext()).inflate(resourceId, null);
+        } else {
+            view = convertView;
+        }
+        TextView newsTitleText =(TextView) view.findViewById(R.id.news_title);
+        newsTitleText.setText(news.getTitle());
+        return view;
+    }
+}

app/src/main/java/hunnu/sj/raise_money/NewsContentActivity.java

@@ -0,0 +1,32 @@
+package hunnu.sj.raise_money;
+
+import android.content.Context;
+import android.content.Intent;
+import android.os.Bundle;
+import android.util.Log;
+import android.view.Window;
+
+import androidx.appcompat.app.AppCompatActivity;
+
+public class NewsContentActivity extends AppCompatActivity{
+    public static void actionStart(Context context, String newsTitle, String newsContent) {
+        Intent intent = new Intent(context, NewsContentActivity.class);
+        intent.putExtra("news_title", newsTitle);
+        intent.putExtra("news_content", newsContent);
+        context.startActivity(intent);
+    }
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        requestWindowFeature(Window.FEATURE_NO_TITLE);
+        Log.v("news_title","here");
+        setContentView(R.layout.news_content);
+        String newsTitle = getIntent().getStringExtra("news_title"); // 获取传入的新闻标题
+        String newsContent = getIntent().getStringExtra("news_content"); // 获取传入的新闻内容
+        NewsContentFragment newsContentFragment = (NewsContentFragment)
+                getFragmentManager().findFragmentById(R.id.news_content_fragment);
+        newsContentFragment.refresh(newsTitle, newsContent); // 刷新NewsContentFragment界面
+    }
+
+
+}

app/src/main/java/hunnu/sj/raise_money/NewsContentFragment.java

@@ -0,0 +1,27 @@
+package hunnu.sj.raise_money;
+
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import android.app.Fragment;
+
+public class NewsContentFragment extends Fragment {
+    private View view;
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        view = inflater.inflate(R.layout.fragment_news_content, container, false);
+        return view;
+    }
+    public NewsContentFragment(){}
+    public void refresh(String newsTitle, String newsContent) {
+        View visibilityLayout = view.findViewById(R.id.visibility_layout);
+        visibilityLayout.setVisibility(View.VISIBLE);
+        TextView newsTitleText = (TextView) view.findViewById (R.id.news_title);
+        TextView newsContentText = (TextView) view.findViewById(R.id.news_content);
+        newsTitleText.setText(newsTitle); // 刷新新闻的标题
+        newsContentText.setText(newsContent); // 刷新新闻的内容
+    }
+}

app/src/main/java/hunnu/sj/raise_money/NewsTitleFragment.java

@@ -0,0 +1,69 @@
+package hunnu.sj.raise_money;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.AdapterView;
+import android.widget.ListView;
+import android.app.Fragment;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class NewsTitleFragment extends Fragment implements AdapterView.OnItemClickListener {
+    private ListView newsTitleListView;
+    private List<News> newsList;
+    private NewsAdapter adapter;
+    private boolean isTwoPane;
+    @Override
+    public void onAttach(Activity activity) {
+        super.onAttach(activity);
+        newsList = getNews(); // 初始化新闻数据
+        adapter = new NewsAdapter(activity, R.layout.news_item, newsList);
+    }
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        View view = inflater.inflate(R.layout.fragment_news_title, container, false);
+        newsTitleListView = (ListView) view.findViewById(R.id.news_title_list_view);
+        newsTitleListView.setAdapter(adapter);
+        newsTitleListView.setOnItemClickListener(this);
+        return view;
+    }
+    @Override
+    public void onActivityCreated(Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        isTwoPane = false; // 可以找到news_content_layout布局时，为双页模式
+    }
+    @Override
+    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
+        News news = newsList.get(position);
+        if (isTwoPane) {
+            // 如果是双页模式，则刷新NewsContentFragment中的内容
+            NewsContentFragment newsContentFragment = (NewsContentFragment) getFragmentManager().findFragmentById(R.id.news_content_fragment);
+            newsContentFragment.refresh(news.getTitle(), news.getContent());
+        } else {
+            // 如果是单页模式，则直接启动NewsContentActivity
+            NewsContentActivity.actionStart(getActivity(), news.getTitle(), news.getContent());
+        }
+    }
+    private List<News> getNews() {
+        List<News> newsList = new ArrayList<News>();
+        News news1 = new News();
+        news1.setTitle("Succeed in College as a Learning Disabled Student");
+        news1.setContent("College freshmen will soon learn to live with a"
+                +"roommate, adjust to a new social scene and survive less-than-stellar"
+                +"dining hall food. Students with learning disabilities will face these"
+                +"transitions while also grappling with a few more hurdles.");
+        newsList.add(news1);
+        News news2 = new News();
+        news2.setTitle("Google Android exec poached by China's Xiaomi");
+        news2.setContent("China's Xiaomi has poached a key Google executive"+
+                "involved in the tech giant's Android phones, in a move seen as a coup"+
+                " for the rapidly growing Chinese smartphone maker.");
+        newsList.add(news2);
+        return newsList;
+    }
+}

app/src/main/java/hunnu/sj/raise_money/dummy/DummyContent.java

@@ -0,0 +1,72 @@
+package hunnu.sj.raise_money.dummy;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Helper class for providing sample content for user interfaces created by
+ * Android template wizards.
+ * <p>
+ * TODO: Replace all uses of this class before publishing your app.
+ */
+public class DummyContent {
+
+    /**
+     * An array of sample (dummy) items.
+     */
+    public static final List<DummyItem> ITEMS = new ArrayList<DummyItem>();
+
+    /**
+     * A map of sample (dummy) items, by ID.
+     */
+    public static final Map<String, DummyItem> ITEM_MAP = new HashMap<String, DummyItem>();
+
+    private static final int COUNT = 25;
+
+    static {
+        // Add some sample items.
+        for (int i = 1; i <= COUNT; i++) {
+            addItem(createDummyItem(i));
+        }
+    }
+
+    private static void addItem(DummyItem item) {
+        ITEMS.add(item);
+        ITEM_MAP.put(item.id, item);
+    }
+
+    private static DummyItem createDummyItem(int position) {
+        return new DummyItem(String.valueOf(position), "Item " + position, makeDetails(position));
+    }
+
+    private static String makeDetails(int position) {
+        StringBuilder builder = new StringBuilder();
+        builder.append("Details about Item: ").append(position);
+        for (int i = 0; i < position; i++) {
+            builder.append("\nMore details information here.");
+        }
+        return builder.toString();
+    }
+
+    /**
+     * A dummy item representing a piece of content.
+     */
+    public static class DummyItem {
+        public final String id;
+        public final String content;
+        public final String details;
+
+        public DummyItem(String id, String content, String details) {
+            this.id = id;
+            this.content = content;
+            this.details = details;
+        }
+
+        @Override
+        public String toString() {
+            return content;
+        }
+    }
+}

app/src/main/res/layout/activity_news_content.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".NewsContentActivity">
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/content_main.xml

@@ -17,4 +17,10 @@
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toTopOf="parent"
         app:navGraph="@navigation/mobile_navigation" />
+
+    <fragment
+        android:id="@+id/fragment"
+        android:name="hunnu.sj.raise_money.NewsContentFragment"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content" />
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/layout/fragment_news_content.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" >
+    <LinearLayout
+        android:id="@+id/visibility_layout"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:orientation="vertical"
+        android:visibility="invisible" >
+        <TextView
+            android:id="@+id/news_title"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:gravity="center"
+            android:padding="10dp"
+            android:textSize="20sp" />
+        <TextView
+            android:id="@+id/news_content"
+            android:layout_width="match_parent"
+            android:layout_height="0dp"
+            android:layout_weight="1"
+            android:padding="15dp"
+            android:textSize="18sp" />
+    </LinearLayout>
+</RelativeLayout>

app/src/main/res/layout/fragment_news_title.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+    <ListView
+        android:id="@+id/news_title_list_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" >
+    </ListView>
+</LinearLayout>

app/src/main/res/layout/news_content.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="vertical" android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <fragment
+        android:id="@+id/news_content_fragment"
+        android:name="hunnu.sj.raise_money.NewsContentFragment"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+</LinearLayout>

app/src/main/res/layout/news_item.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+    <TextView
+        android:id="@+id/news_title"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:singleLine="true"
+        android:ellipsize="end"
+        android:textSize="18sp"
+        android:paddingLeft="10dp"
+        android:paddingRight="10dp"
+        android:paddingTop="15dp"
+        android:paddingBottom="15dp"/>
+</LinearLayout>

app/src/main/res/values/dimens.xml

@@ -5,4 +5,5 @@
     <dimen name="nav_header_vertical_spacing">8dp</dimen>
     <dimen name="nav_header_height">176dp</dimen>
     <dimen name="fab_margin">16dp</dimen>
+    <dimen name="text_margin">16dp</dimen>
 </resources>

app/src/main/res/values/strings.xml

@@ -18,4 +18,7 @@
     <string name="menu_pic">HeadPortrait</string>
     <string name="need_help">申请帮助</string>
     <string name="on_upload_pic">onUploadPic</string>
+
+    <!-- TODO: Remove or change this placeholder text -->
+    <string name="hello_blank_fragment">Hello blank fragment</string>
 </resources>