Fragment片段的使用1-三会一课列表

一、静态页面

FragmentProject.zip

二、整体页面

FragmentProject.zip

三、页面实现的步骤：

1.上部分RecyclerView的实现：

1.1实现主布局，创建item_list_lesson.xml布局文件，上部分用recyclerview实现，下部分用分段实现

         ![image.png](https://cdn.nlark.com/yuque/0/2021/png/1574587/1616055176041-cbced1fe-4fb1-46b2-bb6e-85628573e8e0.png#align=left&display=inline&height=520&margin=%5Bobject%20Object%5D&name=image.png&originHeight=520&originWidth=530&size=51628&status=done&style=none&width=530)

1.2创建recyclerview_lesson.xml布局文件，实现recyclerview的内容部分样式

       ![image.png](https://cdn.nlark.com/yuque/0/2021/png/1574587/1616055275850-0512e18e-47fc-4f89-bc0a-2d302e993aba.png#align=left&display=inline&height=340&margin=%5Bobject%20Object%5D&name=image.png&originHeight=340&originWidth=559&size=32557&status=done&style=none&width=559)

1.3创建LessonDataBean文件，封装数据

      ![image.png](https://cdn.nlark.com/yuque/0/2021/png/1574587/1616055430915-c3e800e3-0085-4118-a56f-bec6d00e084b.png#align=left&display=inline&height=278&margin=%5Bobject%20Object%5D&name=image.png&originHeight=278&originWidth=390&size=16330&status=done&style=none&width=390)

1.4创建LessonAdapter适配器文件，实现数据传输

 ![image.png](https://cdn.nlark.com/yuque/0/2021/png/1574587/1616055581453-1acfa710-27b5-4165-a691-70180acd923e.png#align=left&display=inline&height=652&margin=%5Bobject%20Object%5D&name=image.png&originHeight=652&originWidth=710&size=64790&status=done&style=none&width=710)

1.5在主活动LessonListActivity中，加入数据，实现静态布局

 ![image.png](https://cdn.nlark.com/yuque/0/2021/png/1574587/1616055787128-74874f6b-536c-4e95-8954-fcf4d139656d.png#align=left&display=inline&height=777&margin=%5Bobject%20Object%5D&name=image.png&originHeight=777&originWidth=708&size=77950&status=done&style=none&width=708)

2.下部分片段嵌套Recyclerview的实现：

2.1创建activity_lesson_fragment_one.xml一个片段recyclerview的页面

   ![image.png](https://cdn.nlark.com/yuque/0/2021/png/1574587/1616055934366-357123ed-2e82-4192-8a1e-0574150f269b.png#align=left&display=inline&height=296&margin=%5Bobject%20Object%5D&name=image.png&originHeight=296&originWidth=580&size=32110&status=done&style=none&width=580)

2.2创建item_lesson_fragment.xml页面布局内容

2.3创建layout_base.xml布局文件，将容器放入

2.4创建ListDataBean文件，将数据封装

2.5创建ListAdapter适配器文件，传输数据

2.6创建BaseFragment文件，将容器放入，BaseFragment（子片段）继承Fragment（片段）

2.7创建LessonFragmentOne文件，LessonFragmentOne继承BaseFragment

2.8添加剩下三个页面

![image.png](https://cdn.nlark.com/yuque/0/2021/png/1574587/1616057282056-6f5e5dbe-9dca-4116-86f6-3e09caeffec1.png#align=left&display=inline&height=413&margin=%5Bobject%20Object%5D&name=image.png&originHeight=413&originWidth=399&size=23487&status=done&style=none&width=399)

3.下部分片段点击切换的实现：

3.1在LessonListActivity文件中判断，进行片段隐藏

3.2在LessonListActivity文件中添加管理器，进行判断，点击则显示该页面

3.3在LessonAdapter文件中添加按钮，获取按钮的位置

3.4在LessonAdapter文件中添加点击事件，实现点击效果

四、整体代码

1.item_list_lesson.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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=".LessonListActivity"
    android:orientation="vertical"
    android:background="#fff6f6f6"
    >
   <androidx.recyclerview.widget.RecyclerView
       android:id="@+id/rv_project"
       android:layout_width="match_parent"
       android:layout_height="50dp"
       android:paddingTop="20dp"
       />
   <FrameLayout
       android:id="@+id/fra_project"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:layout_weight="1"
       android:paddingTop="20dp"
       android:paddingLeft="60dp"
       />
</LinearLayout>

2.recyclerview_lesson.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="36dp"
    android:orientation="horizontal"
    android:gravity="center"
    android:paddingLeft="60dp">
   <TextView
       android:id="@+id/tv_title"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:text="党员支部大会"
       android:textSize="12sp"
       android:textColor="#73000000"
       />
</LinearLayout>

3.LessonDataBean文件代码

package com.example.fragmentproject.bean;
public class LessonDataBean {
    private int title;
    public LessonDataBean(int title) {
        this.title = title;
    }
    public int getTitle() {
        return title;
    }
    public void setTitle(int title) {
        this.title = title;
    }
}

4.LessonAdapter文件代码

package com.example.fragmentproject.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.fragmentproject.R;
import com.example.fragmentproject.bean.LessonDataBean;
import java.util.List;
public class LessonAdapter extends RecyclerView.Adapter<LessonAdapter.MyViewHolder>{
    private Context context;
    private List<LessonDataBean> list;
    private View inflate;
    public LessonAdapter(Context context, List<LessonDataBean> list) {
        this.context = context;
        this.list = list;
    }
    //第一步，定义一个接口
    public interface OnItemClickListener{
        void onClick(int position);
    }
    private OnItemClickListener listener;
    //第二步，写一个公共的方法
    public void setOnItemClickListener(OnItemClickListener listener){
        this.listener=listener;
    }
    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        inflate= LayoutInflater.from(context).inflate(R.layout.recyclerview_lesson,parent,false);
        MyViewHolder viewHolder=new MyViewHolder(inflate);
        return viewHolder;
    }
    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.tv_title.setText(list.get(position).getTitle());
        holder.itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (listener!=null){
                    listener.onClick(position);
                }
            }
        });
    }
    @Override
    public int getItemCount() {
        return list.size();
    }
    class MyViewHolder extends RecyclerView.ViewHolder{
        private TextView tv_title;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            tv_title=itemView.findViewById(R.id.tv_title);
        }
    }
}

5.LessonListActivity文件代码

package com.example.fragmentproject;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.recyclerview.widget.DefaultItemAnimator;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Context;
import android.os.Bundle;
import android.text.BoringLayout;
import android.widget.FrameLayout;
import com.example.fragmentproject.adapter.LessonAdapter;
import com.example.fragmentproject.adapter.ListAdapter;
import com.example.fragmentproject.bean.LessonDataBean;
import com.example.fragmentproject.bean.ListDataBean;
import com.example.fragmentproject.fragment.LessonFragmentFour;
import com.example.fragmentproject.fragment.LessonFragmentOne;
import com.example.fragmentproject.fragment.LessonFragmentThree;
import com.example.fragmentproject.fragment.LessonFragmentTwo;
import java.util.ArrayList;
public class LessonListActivity extends AppCompatActivity {
    private RecyclerView recyclerView;
    private LessonAdapter lessonAdapter;
    private ArrayList<LessonDataBean> list=new ArrayList<>();
    private Context context;
    private int[] title={R.string.title_one,R.string.title_two,R.string.title_three,R.string.title_four};
    private LessonFragmentOne lessonFragmentOne;
    private LessonFragmentTwo lessonFragmentTwo;
    private LessonFragmentThree lessonFragmentThree;
    private LessonFragmentFour lessonFragmentFour;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.item_list_lesson);
        context=this;
        initData();
        initView();
        setFragment(0);
    }
    private void initData(){
        for (int i=0;i<4;i++){
            LessonDataBean lessonDataBean=new LessonDataBean(title[i]);
            list.add(lessonDataBean);
        }
    }
    private void initView(){
        recyclerView=findViewById(R.id.rv_project);
        lessonAdapter=new LessonAdapter(context,list);
        lessonAdapter.setOnItemClickListener(new LessonAdapter.OnItemClickListener() {
            @Override
            public void onClick(int position) {
                setFragment(position);
            }
        });
        LinearLayoutManager manager=new LinearLayoutManager(context);
        manager.setOrientation(LinearLayoutManager.HORIZONTAL);
        recyclerView.setLayoutManager(manager);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(lessonAdapter);
        setFragment(0);
    }
    private void hideFragments(FragmentTransaction transaction){
        if (lessonFragmentOne!=null){
            transaction.hide(lessonFragmentOne);
        }
        if (lessonFragmentTwo!=null){
            transaction.hide(lessonFragmentTwo);
        }
        if (lessonFragmentThree!=null){
            transaction.hide(lessonFragmentThree);
        }
        if (lessonFragmentFour!=null){
            transaction.hide(lessonFragmentFour);
        }
    }
    public void setFragment(int position){
        //获取Fragment管理器
        FragmentManager fragmentManager=getSupportFragmentManager();
        //开启事务
        FragmentTransaction transaction=fragmentManager.beginTransaction();
        //隐藏所有Fragment
        hideFragments(transaction);
        switch (position) {
            default:
                break;
            case 0:
                //显示对应Fragment
                if (lessonFragmentOne == null) {
                    lessonFragmentOne = new LessonFragmentOne();
                    transaction.add(R.id.fra_project, lessonFragmentOne, "lessonFragmentOne");
                } else {
                    transaction.show(lessonFragmentOne);
                }
                break;
            case 1:
                if (lessonFragmentTwo == null) {
                    lessonFragmentTwo = new LessonFragmentTwo();
                    transaction.add(R.id.fra_project, lessonFragmentTwo, "lessonFragmentTwo");
                } else {
                    transaction.show(lessonFragmentTwo);
                }
                break;
            case 2:
                if (lessonFragmentThree==null){
                    lessonFragmentThree=new LessonFragmentThree();
                    transaction.add(R.id.fra_project,lessonFragmentThree,"lessonFragmentThree");
                }else {
                    transaction.show(lessonFragmentThree);
                }
                break;
            case 3:
                if (lessonFragmentFour == null) {
                    lessonFragmentFour=new LessonFragmentFour();
                    transaction.add(R.id.fra_project,lessonFragmentFour,"lessonFragmentFour");
                }else {
                    transaction.show(lessonFragmentFour);
                }
                break;
        }
           //提交事务
        transaction.commitAllowingStateLoss();    
    }   
}

6.activity_lesson_fragment_one.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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=".fragment.LessonFragmentOne"
    >
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_fra_one"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</FrameLayout>

7.item_lesson_fragment.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="400dp"
    android:layout_height="71dp"
    android:orientation="vertical"
    android:background="@drawable/fra_radius_border"
    android:padding="12dp"
    android:layout_marginBottom="20dp"
    >
    <TextView
        android:id="@+id/tv_headline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府"
        android:textSize="14sp"
        android:textColor="#d9000000"
        android:lines="1"
        android:ellipsize="end"
        />
    <TextView
        android:id="@+id/tv_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="2020-12-17 09:00"
        android:textSize="10sp"
        android:textColor="#73000000"
        android:layout_gravity="end"
        android:layout_marginTop="12dp"
        />
</LinearLayout>

8.layout_base.xml布局文件

<?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">
    <FrameLayout
        android:id="@+id/fl_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >
    </FrameLayout>
</LinearLayout>

9.ListDataBean文件代码

package com.example.fragmentproject.bean;
public class ListDataBean {
    private String headline;
    private String time;
    public ListDataBean(String headline, String time) {
        this.headline = headline;
        this.time = time;
    }
    public String getHeadline() {
        return headline;
    }
    public void setHeadline(String headline) {
        this.headline = headline;
    }
    public String getTime() {
        return time;
    }
    public void setTime(String time) {
        this.time = time;
    }
}

10.ListAdapter文件代码

package com.example.fragmentproject.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.fragmentproject.R;
import com.example.fragmentproject.bean.ListDataBean;
import java.util.List;
public class ListAdapter extends RecyclerView.Adapter<ListAdapter.MyViewHolder>{
    private Context context;
    private List<ListDataBean> list;
    private View inflate;
    public ListAdapter(Context context, List<ListDataBean> list) {
        this.context = context;
        this.list = list;
    }
    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        inflate= LayoutInflater.from(context).inflate(R.layout.item_lesson_fragment,parent,false);
        MyViewHolder viewHolder=new MyViewHolder(inflate);
        return viewHolder;
    }
    @Override
    public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
        holder.tv_headline.setText(list.get(position).getHeadline());
        holder.tv_time.setText(list.get(position).getTime());
    }
    @Override
    public int getItemCount() {
        return list.size();
    }
    class MyViewHolder extends RecyclerView.ViewHolder{
        private TextView tv_headline;
        private TextView tv_time;
        public MyViewHolder(@NonNull View itemView) {
            super(itemView);
            tv_headline=itemView.findViewById(R.id.tv_headline);
            tv_time=itemView.findViewById(R.id.tv_time);
        }
    }
}

11.BaseFragment件代码

package com.example.fragmentproject.base;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import com.example.fragmentproject.R;
public abstract class BaseFragment extends Fragment {
    protected Context context;
    public View rootView;
    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        context = getActivity();
    }
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, 
                            @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        rootView = inflater.inflate(R.layout.layout_base, container, false);
        ((ViewGroup) rootView.findViewById(R.id.fl_content)).
              addView(getLayoutInflater().inflate(getLayoutId(), null));
        return rootView;
    }
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        initView();
    }
    /**
     * 返回页面layout
     *
     * @return layout
     */
    protected abstract int getLayoutId();
    /**
     * 初始化View
     */
    protected abstract void initView();
}

12.LessonFragmentOne文件代码

package com.example.fragmentproject.fragment;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import com.example.fragmentproject.LessonListActivity;
import com.example.fragmentproject.R;
import com.example.fragmentproject.adapter.ListAdapter;
import com.example.fragmentproject.base.BaseFragment;
import com.example.fragmentproject.bean.ListDataBean;
import java.util.ArrayList;
public class LessonFragmentOne extends BaseFragment {
    private RecyclerView mRecyclerView;
    private ListAdapter listAdapter;
    private ArrayList<ListDataBean> arrayList=new ArrayList<>();
    private String[] headline={"国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            "国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            "国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            "国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            "国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府"};
    private String[] time={"2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00",
            "2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00"};
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
    }
    @Override
    protected int getLayoutId(){
        return R.layout.activity_lesson_fragment_one;
    }
    @Override
    protected void initView(){
        for (int i=0;i<10;i++){
            ListDataBean listDataBean=new ListDataBean(headline[i],time[i]);
            arrayList.add(listDataBean);
        }
        mRecyclerView=rootView.findViewById(R.id.rv_fra_one);
        listAdapter=new ListAdapter(getActivity(),arrayList);
        GridLayoutManager gridLayoutManager=new GridLayoutManager(getActivity(),2);
        gridLayoutManager.setOrientation(GridLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(gridLayoutManager);
        mRecyclerView.setAdapter(listAdapter);
    }
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }
}

13.activity_lesson_fragment_two.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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=".fragment.LessonFragmentOne"
    >
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_fra_two"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</FrameLayout>

14.activity_lesson_fragment_three.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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=".fragment.LessonFragmentOne"
    >
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_fra_three"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</FrameLayout>

15.activity_lesson_fragment_four.xml布局文件

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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=".fragment.LessonFragmentOne"
    >
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/rv_fra_four"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</FrameLayout>

16.LessonFragmentTwo文件代码

package com.example.fragmentproject.fragment;
import android.os.Bundle;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.fragmentproject.R;
import com.example.fragmentproject.adapter.ListAdapter;
import com.example.fragmentproject.base.BaseFragment;
import com.example.fragmentproject.bean.ListDataBean;
import java.util.ArrayList;
public class LessonFragmentTwo extends BaseFragment {
    private RecyclerView mRecyclerView;
    private ListAdapter listAdapter;
    private ArrayList<ListDataBean> arrayList=new ArrayList<>();
    private String[] headline={"网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            "国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            "国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
           };
    private String[] time={"2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00",
            "2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00"};
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
    }
    @Override
    protected int getLayoutId(){
        return R.layout.activity_lesson_fragment_two;
    }
    @Override
    protected void initView(){
        for (int i=0;i<6;i++){
            ListDataBean listDataBean=new ListDataBean(headline[i],time[i]);
            arrayList.add(listDataBean);
        }
        mRecyclerView=rootView.findViewById(R.id.rv_fra_two);
        listAdapter=new ListAdapter(getActivity(),arrayList);
        GridLayoutManager gridLayoutManager=new GridLayoutManager(getActivity(),2);
        gridLayoutManager.setOrientation(GridLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(gridLayoutManager);
        mRecyclerView.setAdapter(listAdapter);
    }
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }
}

17.LessonFragmentThree文件代码

package com.example.fragmentproject.fragment;
import android.os.Bundle;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.fragmentproject.R;
import com.example.fragmentproject.adapter.ListAdapter;
import com.example.fragmentproject.base.BaseFragment;
import com.example.fragmentproject.bean.ListDataBean;
import java.util.ArrayList;
public class LessonFragmentThree extends BaseFragment {
    private RecyclerView mRecyclerView;
    private ListAdapter listAdapter;
    private ArrayList<ListDataBean> arrayList=new ArrayList<>();
    private String[] headline={"国办通报政府网站、政务新媒体检查结果","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            "国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            "国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            "国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            };
    private String[] time={"2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00",
            "2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00"};
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
    }
    @Override
    protected int getLayoutId(){
        return R.layout.activity_lesson_fragment_three;
    }
    @Override
    protected void initView(){
        for (int i=0;i<8;i++){
            ListDataBean listDataBean=new ListDataBean(headline[i],time[i]);
            arrayList.add(listDataBean);
        }
        mRecyclerView=rootView.findViewById(R.id.rv_fra_three);
        listAdapter=new ListAdapter(getActivity(),arrayList);
        GridLayoutManager gridLayoutManager=new GridLayoutManager(getActivity(),2);
        gridLayoutManager.setOrientation(GridLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(gridLayoutManager);
        mRecyclerView.setAdapter(listAdapter);
    }
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }
}

18.LessonFragmentFour文件代码

package com.example.fragmentproject.fragment;
import android.os.Bundle;
import android.view.View;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.fragmentproject.R;
import com.example.fragmentproject.adapter.ListAdapter;
import com.example.fragmentproject.base.BaseFragment;
import com.example.fragmentproject.bean.ListDataBean;
import java.util.ArrayList;
public class LessonFragmentFour extends BaseFragment {
    private RecyclerView mRecyclerView;
    private ListAdapter listAdapter;
    private ArrayList<ListDataBean> arrayList=new ArrayList<>();
    private String[] headline={"政务新媒体检查结果 网上办尖办成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            "国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府","国办通报政府网站、政务新媒体检查结果 网上办尖办”成态国办通报政府",
            };
    private String[] time={"2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00","2020-12-17 09:00"};
    @Override
    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
    }
    @Override
    protected int getLayoutId(){
        return R.layout.activity_lesson_fragment_four;
    }
    @Override
    protected void initView(){
        for (int i=0;i<4;i++){
            ListDataBean listDataBean=new ListDataBean(headline[i],time[i]);
            arrayList.add(listDataBean);
        }
        mRecyclerView=rootView.findViewById(R.id.rv_fra_four);
        listAdapter=new ListAdapter(getActivity(),arrayList);
        GridLayoutManager gridLayoutManager=new GridLayoutManager(getActivity(),2);
        gridLayoutManager.setOrientation(GridLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(gridLayoutManager);
        mRecyclerView.setAdapter(listAdapter);
    }
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
    }
}

19.结果图：

20.设计图：