碎片的实例

1.添加依赖因为要用到RecyclerView的控件

2类--.建立新闻的类（两个字段（title和content））

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;
    }
}
3.布局--新建新闻内容的布局
布局有两块（标题（TextView）和内容（TextView）中间用一个View隔开（装一条线））
4.类--新建NewContentFrament类继承Frament

public class NewsContentFragment extends Fragment {
    private View view;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle saveInstanceState)
    {
      view=inflater.inflate(R.layout.news_content_frag,container,false);
        return view;
    }//先找到刚刚建立的布局中的View的界面返回赋给之前定义好的View
    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.new_title);
        TextView newsContentText=(TextView) view.findViewById(R.id.new_content);
        newsTitleText.setText(newsTitle);//刷新新闻的标题
        newsContentText.setText(newsContent);//刷新内容
    }//从View中获得各种需要使用的信息包括，标题和内容
}
以上完成双页模式显示
5.布局--新建一个新活动（NewsContentActivity相应为产生的布局添加一个碎片）

<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="com.example.fragmentbestpractice.NewsContentFragment"//将刚刚制作的布局引进来
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</LinearLayout>
6.修改最开始那个活动的代码

public class NewsContentActivity extends AppCompatActivity {
public static void actionStart(Context context, String newsTitle,String newsContent)
{
    Intent intent=new Intent(context,NewsContentActivity.class);//定义活动传进新闻活动标题和内容
    intent.putExtra("news_title",newsTitle);
    intent.putExtra("newsContent",newsContent);
    context.startActivity(intent);
}
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_news_content);
        String newsTitle=getIntent().getStringExtra("news_title");
        String newContent=getIntent().getStringExtra("news_content");
        NewsContentFragment newsContentFragment=(NewsContentFragment)getSupportFragmentManager().findFragmentById(R.id.news_content_fragment);
        newsContentFragment.refresh(newsTitle,newContent);
    }
}
7.布局--新建新闻列表的布局此处要用到recyclerView的列表布局

<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:id="@+id/new_title_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</LinearLayout>
8.布局---新建RecyclerView子项的布局

<TextureView xmlns:android="http://schemas.android.com/apk/res/android"
    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"
    />
9.类--新建新闻列表的碎片里面放新闻列表

public class NewsTitleFragment extends Fragment {
    private boolean isTwoPane;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle saveInstanceState)
    {
        View view=inflater.inflate(R.layout.news_title_frag,container,false);
        return view;
    }//传进来布局

public void onActivityCreated(Bundle saveInstanceState)
{
    super.onActivityCreated(saveInstanceState);
    if(getActivity().findViewById(R.id.news_content_fragment)!=null)
    {
    isTwoPane=true;
        }
    else
    {
        isTwoPane=false;
    }
}
10.新建一个主活动的布局//两个碎片

<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_title_fragment"//碎片一
        android:name="com.example.fragmentbestpractice.NewsTitleFragment"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        />
    <FrameLayout
        android:id="@+id/news_content_layout"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="3"
        >
        <fragment//碎片二放新闻内容
            android:id="@+id/news_content_fragment"
            android:name="com.example.fragmentbestpractice.NewsContentFragment"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            />

        </FrameLayout>>
</LinearLayout>
11.在NewsTitleFragment中通过Recycler将新闻列表展示处理来，需要在其内部放一个适配器，就在里面定义

class NewsAdapter extends RecyclerView.Adapter<NewsAdapter.ViewHolder> {
    private List<News> mNewList;
    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)
    {
        mNewList=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 v)
            {
                News news=mNewList.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(ViewHolder holder,int position)
{
    News news=mNewList.get(position);
    holder.newsTitleText.setText(news.getTitle());
}
        @Override
        public int getItemCount()
        {
            return mNewList.size();
        }
    }
}
最后向RecycleView中填充数据修改NewsTitleFragement中代码

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle saveInstanceState)
{
    View view=inflater.inflate(R.layout.news_title_frag,container,false);
    RecyclerView newsTitleRecyclerView=(RecyclerView) view.findViewById(R.id.new_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=1;i<=50;i++)
    {
        News news=new News();
        news.setTitle("This is news title"+i);
        news.setContent(getRandomLengthContent("This is news content"+""));
        newsList.add(news);
    }
    return  newsList;
}
public String  getRandomLengthContent(String content)
{
    Random random=new Random();
    int length=random.nextInt(20)+1;
    StringBuilder bulider=new StringBuilder();
    for (int i=0;i<length;i++)
    {
        bulider.append(content);
    }
    return bulider.toString();
}