Android連載13-創建啟動活動類

根據碎片的生命周期，我們知道onAttach()方法首先會被執行，因此在這裡做一些數據初始化的操作，比如調用getNews()方法獲取幾條模擬的新聞數據，以及完成NewsAdapter的創建，然後在onCreateView()方法中載入了news_title_frag佈局，並給新聞列表的ListView註冊了點擊實踐，接下來在onActivityCreated（）方法中，我們通過是否能夠找到一個id為news_content_layout的View只在雙頁模式中才會出現，在稍後的佈局中將會看到。然後在ListView的點擊事件中我們可以判斷出來，如果當前是單頁模式，就會啟動一個新的活動去顯示新聞內容，如果當前是雙頁模式，​就更新新聞內容碎片里的數據。​

package com.example.fragmentbestpractice;

​

import java.util.ArrayList;

import java.util.List;

​

import android.app.Activity;

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ListView;

​

public class NewsTitleFragment extends Fragment implements OnItemClickListener{

  private ListView newsTitleListView;

 

  private List<News> newsList;

 

  private NewsAdapter adapter;

 

  private boolean isTwoPane;

 

  @Override

  public void onAttach(Activity activity) {

    super.onAttach(activity);

    newsList = getNews(); //初始化新聞數據

    adapter = new NewsAdapter(activity,R.layout.news_item,newsList);

  }

 

  @Override

  public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {

    View view = inflater.inflate(R.layout.news_title_frag,container,false);

    newsTitleListView = (ListView) view.findViewById(R.id.news_title_list_view);

    newsTitleListView.setAdapter(adapter);

    newsTitleListView.setOnItemClickListener(this);

    return view;

  }

 

  @Override

  public void onActivityCreated(Bundle savedInstanceState) {

    super.onActivityCreated(savedInstanceState);

    if(getActivity().findViewById(R.id.news_content_layout)!= null) {

      isTwoPane = true;//可以找到news_content_layout佈局時，為雙頁模式     

    }else {

      isTwoPane = false;//找不到news_content_layout佈局時，為單頁模式

    }

  }

 

  @Override

  public void onItemClick(AdapterView<?> parent,View view,int position,long id) {

    News news = newsList.get(position);

    if(isTwoPane) {

      //如果是雙頁模式，則刷新NewsContentFrayment中的內容

      NewsContentFragment newsContentFragment = (NewsContentFragment)getFragmentManager().findFragmentById(R.id.news_content_fragment);

      newsContentFragment.refresh(news.getTitle(),news.getTitle());

    }else {

      //如果是單頁模式，則直接啟動NewsContentActivity

      NewsContentActivity.actionStart(getActivity(), news.getTitle(), news.getContent()); 

    }

  }

  private List<News> getNews(){

    List<News> newsList = new ArrayList<News>();

    News news1 = new News();

    news1.setTitle("Succeed in College as a Learning Disabled Student");

    news1.setContent("Collaget freshmen will soon learn to live with roomate,adjust to a new social scene and survive less-than-stellar.");

    News news2 = new News();

    news2.setTitle("Google Android exec poached by China's Xiaomi");

    news2.setContent("China's Xiaomi has poached a key Google executive.");

    newsList.add(news2);

    return newsList;

   

   

  }

​

}

​

三、源碼：

1.項目地址

https://github.com/ruigege66/Android/tree/master/FragmentBestPractise

2.CSDN：https://blog.csdn.net/weixin_44630050

3.博客園：https://www.cnblogs.com/ruigege0000/

4.歡迎關註微信公眾號：傅里葉變換，個人公眾號，僅用於學習交流，後臺回覆”禮包“，獲取大數據學習資料