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注:以下新建文件所有.java的全在mainactivity.java旁边,xml文件全在layout文件夹下。
先在gradle里添加依赖- compile 'com.android.support:recyclerview-v7:26.+'
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同步以后再新建个储存数据的类News.java- package com.example.xinwei.fragmentbestpractise;
- /**
- * Created by xinwei on 2017/10/6.
- */
- public class News {
- public String getTitle() {
- return title;
- }
- public String getContent() {
- return content;
- }
- public void setTitle(String title) {
- this.title = title;
- }
- public void setContent(String content) {
- this.content = content;
- }
- private String title;
- private String content;
-
- }
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然后新建个布局文件news_content_frag.xml- <?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:layout_width="match_parent"
- android:layout_height="match_parent"
- android:id="@+id/visibility_layout"
- android:orientation="vertical"
- android:visibility="invisible">
- <TextView
- android:id="@+id/news_title"
- android:gravity="center"
- android:padding="10dp"
- android:textSize="20sp"
- android:layout_width="match_parent"
- android:layout_height="wrap_content" />
- <View
- android:layout_width="match_parent"
- android:layout_height="1dp"
- android:background="#000" />
- <TextView
- android:id="@+id/news_content"
- android:padding="15dp"
- android:textSize="18sp"
- android:layout_width="match_parent"
- android:layout_height="0dp"
- android:layout_weight="1"/>
- </LinearLayout>
- <View
- android:layout_width="1dp"
- android:layout_height="match_parent"
- android:layout_alignParentLeft="true"
- android:background="#000" />
- </RelativeLayout>
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再新建个NewsContentFragment.java文件- package com.example.xinwei.fragmentbestpractise;
- import android.os.Bundle;
- import android.support.annotation.Nullable;
- import android.support.v4.app.Fragment;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.TextView;
- /**
- * Created by xinwei on 2017/10/6.
- */
- public class NewsContentFragment extends Fragment {
- private View view;
- @Nullable
- @Override
- public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
- view = inflater.inflate(R.layout.news_content_frag,container,false);
- return view;
- }
- public void refresh(String newsTitle, String newsContent){
- View visibilityLayout=view.findViewById(R.id.visibility_layout);
- visibilityLayout.setVisibility(View.VISIBLE);
- TextView newsTitleText=view.findViewById(R.id.news_title);
- TextView newsContentText=view.findViewById(R.id.news_content);
- newsTitleText.setText(newsTitle);
- newsContentText.setText(newsContent);
- }
- }
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然后新建个NewsContentActivity.java的活动,把自动创建的布局名设置为news_content,把news_content.xml文件修改为- <?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:layout_width="match_parent"
- android:layout_height="match_parent"
- android:id="@+id/news_content_fragment"
- android:name="com.example.xinwei.fragmentbestpractise.NewsContentFragment" />
- </LinearLayout>
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然后修改NewsContentActivity.java- package com.example.xinwei.fragmentbestpractise;
- import android.content.Context;
- import android.content.Intent;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- 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);
- setContentView(R.layout.news_content);
- String newsTitle=getIntent().getStringExtra("news_title");
- String newsContent=getIntent().getStringExtra("news_content");
- NewsContentFragment newsContentFragment=(NewsContentFragment)getSupportFragmentManager().findFragmentById(R.id.news_content_fragment);
- newsContentFragment.refresh(newsTitle,newsContent);
- }
- }
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继续创建个布局文件news_title_frag.xml- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical" android:layout_width="match_parent"
- android:layout_height="match_parent">
- <android.support.v7.widget.RecyclerView
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:id="@+id/news_title_recycler_view"/>
- </LinearLayout>
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在新建个news_item.xml布局文件作为recyclerveiw的子项- <?xml version="1.0" encoding="utf-8"?>
- <TextView xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:id="@+id/news_title"
- android:singleLine="true"
- android:ellipsize="end"
- android:textSize="18sp"
- android:paddingLeft="10dp"
- android:paddingRight="10dp"
- android:paddingTop="15dp"
- android:paddingBottom="15dp" />
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然后再新建个NewsTitleFragment.java文件- package com.example.xinwei.fragmentbestpractise;
- import android.os.Bundle;
- import android.support.annotation.Nullable;
- import android.support.v4.app.Fragment;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- /**
- * Created by xinwei on 2017/10/6.
- */
- public class NewsTitleFragment extends Fragment {
- private boolean isTwoPane;
- @Override
- public void onActivityCreated(@Nullable Bundle savedInstanceState) {
- super.onActivityCreated(savedInstanceState);
- if(getActivity().findViewById(R.id.news_content_layout)!=null){
- isTwoPane=true;
- }else{
- isTwoPane=false;
- }
- }
- @Nullable
- @Override
- public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
- View view=inflater.inflate(R.layout.news_title_frag,container,false);
- return view;
- }
- }
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修改activity_main.xml文件- <?xml version="1.0" encoding="utf-8"?>
- <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:id="@+id/news_title_layout"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- >
- <fragment
- android:id="@+id/news_title_fragment"
- android:name="com.example.xinwei.fragmentbestpractise.NewsTitleFragment"
- android:layout_width="match_parent"
- android:layout_height="match_parent"/>
- </FrameLayout>
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然后在res目录下新建layout-sw600dp文件夹,在这个目录下新建activity_main.xml文件- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="horizontal" android:layout_width="match_parent"
- android:layout_height="match_parent">
- <fragment
- android:id="@+id/news_title_fragment"
- android:name="com.example.xinwei.fragmentbestpractise.NewsTitleFragment"
- android:layout_width="0dp"
- android:layout_weight="1"
- android:layout_height="match_parent" />
- <FrameLayout
- android:id="@+id/news_content_layout"
- android:layout_width="0dp"
- android:layout_weight="3"
- android:layout_height="match_parent">
- <fragment
- android:id="@+id/news_content_fragment"
- android:name="com.example.xinwei.fragmentbestpractise.NewsContentFragment"
- android:layout_width="match_parent"
- android:layout_height="match_parent" />
- </FrameLayout>
- </LinearLayout>
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然后再修改NewsTitleFragment.java文件- package com.example.xinwei.fragmentbestpractise;
- import android.os.Bundle;
- import android.support.annotation.Nullable;
- import android.support.v4.app.Fragment;
- import android.support.v7.widget.LinearLayoutManager;
- import android.support.v7.widget.RecyclerView;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.TextView;
- import java.util.ArrayList;
- import java.util.List;
- import java.util.Random;
- /**
- * Created by xinwei on 2017/10/6.
- */
- public class NewsTitleFragment extends Fragment {
- private boolean isTwoPane;
- @Override
- public void onActivityCreated(@Nullable Bundle savedInstanceState) {
- super.onActivityCreated(savedInstanceState);
- if(getActivity().findViewById(R.id.news_content_layout)!=null){
- isTwoPane=true;
- }else{
- isTwoPane=false;
- }
- }
- @Nullable
- @Override
- public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
- View view=inflater.inflate(R.layout.news_title_frag,container,false);
- RecyclerView newsTitleRecyclerView=(RecyclerView)view.findViewById(R.id.news_title_recycler_view);
- LinearLayoutManager layoutManager=new LinearLayoutManager(getActivity());
- newsTitleRecyclerView.setLayoutManager(layoutManager);
- NewsAdapter newsAdapter=new NewsAdapter(getNews());
- newsTitleRecyclerView.setAdapter(newsAdapter);
- return view;
- }
- private List<News> getNews(){
- List<News> newsList=new ArrayList<>();
- for(int i=1;i<=50;i++){
- News news=new News();
- news.setTitle("This is news title"+i);
- news.setContent(getRandomLengthContent("This is news content"+i+"."));
- newsList.add(news);
- }
- return newsList;
- }
- private String getRandomLengthContent(String content){
- Random random=new Random();
- int length=random.nextInt(20)+1;
- StringBuilder builder=new StringBuilder();
- for(int i=0;i<length;i++){
- builder.append(content);
- }
- return builder.toString();
- }
- class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.ViewHolder>{
- private List<News> mNewsList;
- class ViewHolder extends RecyclerView.ViewHolder{
- TextView newsTitleText;
- public ViewHolder(View itemView) {
- super(itemView);
- newsTitleText=itemView.findViewById(R.id.news_title);
- }
- }
- public NewsAdapter(List<News> newsList){
- mNewsList=newsList;
- }
- @Override
- public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
- View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.news_item,parent,false);
- final ViewHolder holder = new ViewHolder(view);
- view.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View view) {
- News news=mNewsList.get(holder.getAdapterPosition());
- if(isTwoPane){
- NewsContentFragment newsContentFragment=(NewsContentFragment)getFragmentManager().findFragmentById(R.id.news_content_fragment);
- newsContentFragment.refresh(news.getTitle(),news.getContent());
- }else{
- NewsContentActivity.actionStart(getActivity(),news.getTitle(),news.getContent());
- }
- }
- });
- return holder;
- }
- @Override
- public void onBindViewHolder(NewsAdapter.ViewHolder holder, int position) {
- News news=mNewsList.get(position);
- holder.newsTitleText.setText(news.getTitle());
- }
- @Override
- public int getItemCount() {
- return mNewsList.size();
- }
- }
- }
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哎!终于写完了,这个其实不用自己写,太麻烦了,我就写了一上午。只要大概看懂了什么意思就行了,我觉得主要是理解。效果图为:
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