Android 新闻显示界面且适应平板

界面

1.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/news_title_layout">

    <fragment
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/news_title_fragment"
        android:name="com.example.ken.fragmentbestpractice.NewsTitleFragment"/>


</FrameLayout>

2.平板模式下的activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <fragment
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="match_parent"
        android:name="com.example.ken.fragmentbestpractice.NewsTitleFragment"
        android:id="@+id/news_title_fragment" />

    <FrameLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:id="@+id/news_content_layout"
        android:layout_weight="3">

        <fragment
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/news_content_fragment"
            android:name="com.example.ken.fragmentbestpractice.NewsContentFragment"/>
    </FrameLayout>

</LinearLayout>

3.news_item.xml

<?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"
    />

4.news_title_frag.xml

<?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">

    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/news_title_recycler_view"/>

</LinearLayout>

5.news_content.xml

<?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.ken.fragmentbestpractice.NewsContentFragment"/>

</LinearLayout>

6.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:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/news_title"
            android:gravity="center"
            android:padding="10dp"
            android:textSize="20sp"/>

        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="#000" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:id="@+id/news_content"
            android:padding="15dp"
            android:textSize="18sp"/>
    </LinearLayout>

    <View
        android:layout_width="1dp"
        android:layout_height="match_parent"
        android:layout_alignParentLeft="true"
        android:background="#000" />

</RelativeLayout>

JAVA  

1.MainActivity.java

package com.example.ken.fragmentbestpractice;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

2.News.java

package com.example.ken.fragmentbestpractice;

public class News {
    private String title;
    private String content;

    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;
    }
}

3.NewsContentActivity.java

package com.example.ken.fragmentbestpractice;

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);
    }
}

4.NewsContentFrag.java

package com.example.ken.fragmentbestpractice;

import android.os.Bundle;
import android.support.annotation.NonNull;
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;

public class NewsContentFragment extends Fragment {

    private View view;

    @Nullable
    @Override
    public View onCreateView(@NonNull 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 visibilityLayoyt = view.findViewById(R.id.visibility_layout);
        visibilityLayoyt.setVisibility(View.VISIBLE);
        TextView newsTitleText = (TextView) view.findViewById(R.id.news_title);
        TextView newsContentText = (TextView) view.findViewById(R.id.news_content);
        newsTitleText.setText(newsTitle);
        newsContentText.setText(newsContent);
    }
}

5.NewsTitleFragment.java

package com.example.ken.fragmentbestpractice;

import android.os.Bundle;
import android.support.annotation.NonNull;
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.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;
import java.util.Random;

public class NewsTitleFragment extends Fragment {

    private boolean isTwoPane;

    @Nullable
    @Override
    public View onCreateView(@NonNull 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 adapter = new NewsAdapter(getNews());
        newsTitleRecyclerView.setAdapter(adapter);
        return view;
    }

    private List<News> getNews(){
        List<News> newsList = new ArrayList<>();
        for (int i =0; 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();
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        if (getActivity().findViewById(R.id.news_content_layout) != null){
            isTwoPane = true;
        }else{
            isTwoPane = false;
        }
    }


    class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.ViewHolder>{

        private List<News> mNewsList;

        class ViewHolder extends RecyclerView.ViewHolder{

            TextView newsTitleText;

            public ViewHolder(View view){
                super(view);
                newsTitleText = (TextView) view.findViewById(R.id.news_title);
            }
        }

        public NewsAdapter(List<News> newsList){
            mNewsList = newsList;
        }

        @NonNull
        @Override
        public ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
            View view = LayoutInflater.from(viewGroup.getContext())
                    .inflate(R.layout.news_item, viewGroup,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(@NonNull ViewHolder viewHolder, int i) {
            News news = mNewsList.get(i);
            viewHolder.newsTitleText.setText(news.getTitle());
        }

        @Override
        public int getItemCount() {
            return mNewsList.size();
        }
    }
}

手机的实现效果是这样的：