MainActivity.java
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); } }
News.java
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; } }
NewsContentActivity.java
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); } }
NewsContentFragment.java
import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import org.w3c.dom.Text; /** * Created by 13178 on 2018-6-14. */ public class NewsContentFragment extends Fragment { private View view; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, 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 = (TextView) view.findViewById(R.id.news_title); TextView newsContentText = (TextView) view.findViewById(R.id.news_content); newsTitleText.setText(newsTitle); newsContentText.setText(newsContent); } }
NewsTitleFragment.java
import android.os.Bundle; 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 13178 on 2018-6-14. */ public class NewsTitleFragment extends Fragment { private boolean isTwoPace; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, 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("这是第新闻标题"+i); news.setContent(getRandomLengthContent("这是第新闻"+ i +". ")); newsList.add(news); } return newsList; } private String getRandomLengthContent(String s) { Random random = new Random(); int length = random.nextInt(20)+1; StringBuilder builder = new StringBuilder(); for(int i=0;i<length;i++){ builder.append(s); } return builder.toString(); } @Override public void onActivityCreated(Bundle savedInstanceState){ super.onActivityCreated(savedInstanceState); if(getActivity().findViewById(R.id.news_content_layout)!=null) { isTwoPace = true; }else{ isTwoPace = false; } } 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= (TextView) 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(isTwoPace){ 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 = mNewsList.get(position); holder.newsTitleText.setText(news.getTitle()); } @Override public int getItemCount() { return mNewsList.size(); } } }
activity_main.xml中
<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.ldxiaofeng.android.fragmentpractice.NewsTitleFragment" android:layout_width="match_parent" android:layout_height="match_parent"/> </FrameLayout>
news_content.xml
<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.ldxiaofeng.android.fragmentpractice.NewsContentFragment" android:layout_width="match_parent" android:layout_height="match_parent"/> </LinearLayout>
news_content_frag.xml
<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"/>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#000"/>
<TextView
android:id="@+id/news_content"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:padding="15sp"
android:textSize="18sp"/>
</LinearLayout>
<View
android:layout_width="1dp"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:background="#000"/>
</RelativeLayout>
news_item.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/news_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:maxLines="1"
android:ellipsize="end"
android:textSize="18sp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingBottom="15dp"
android:paddingTop="15dp"/>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#000"/>
</RelativeLayout>
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:id="@+id/news_title_recycler_view" android:layout_width="match_parent" android:layout_height="match_parent" /> </LinearLayout>