【转】FragmentTest学习笔记1

原文网址：http://blog.csdn.net/hishentan/article/details/20734489

源码部分：

BookContent.java

[java] view plain copy

package com.example.bookdetailfragment;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.content.Context;
public class BookContent {
//inner class
public static class Book{
public Integer id;
public String title;
public String desc;
public Book(Integer id,String title,String desc){
this.id = id;
this.title = title;
this.desc = desc;
}
@Override
public String toString(){
return this.title;
}
}
//recorde included book object
public static List<Book> ITEMS = new ArrayList<Book>();
public static Map<Integer,Book> ITEM_MAP = new HashMap<Integer,Book>();
static{
addItem(new Book(1,"Java","Java是一种可以撰写跨平台应用软件的面向对象的程序设计语言，是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台（即JavaSE, JavaEE, JavaME）的总称。Java 技术具有卓越的通用性、高效性、平台移植性和安全性，广泛应用于个人PC、数据中心、游戏控制台、科学超级计算机、移动电话和互联网，同时拥有全球最大的开发者专业社群。"));
addItem(new Book(2,"Math","数学是源自于人类早期的生产活动，早期古希腊、古巴比伦、古埃及、古印度及中国古代都对数学有所研究。数学是研究数量、结构、变化以及空间模型等概念的一门学科。透过抽象化和逻辑推理的运用，由计数、计算、量度和对物体形状及运动的观察中产生。数学的基本要素是：逻辑和直观、分析和推理、共性和个性。"));
addItem(new Book(3,"English","英语（English ）属于印欧语系中下的西日耳曼语支，由古代从欧洲大陆移民大不列颠岛的盎格鲁、撒克逊和朱特部落的日耳曼人所说的语言演变而来，并通过英国的殖民活动传播到世界各地。由于在历史上曾和多种民族语言接触，它的词汇从一元变为多元，语法从“多屈折”变为“少屈折”，语音也发生了规律性的变化。"));
}
//add book object to list and map respectively
public static void addItem(Book book){
ITEMS.add(book);
ITEM_MAP.put(book.id,book);
}
}

BookDetailFragment.java

[java] view plain copy

package com.example.bookdetailfragment;
import android.os.Bundle;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class BookDetailFragment extends Fragment {
public static final String ITEM_ID = "item_id";
BookContent.Book book;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(getArguments().containsKey(ITEM_ID)){
//--如果启动该Fragment时包含了ITEM_ID参数
book = BookContent.ITEM_MAP.get(getArguments().getInt(ITEM_ID));
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState){
//加载布局文件
View rootView = inflater.inflate(R.layout.activity_book_detail_fragment,
container, false);
if(book!=null){
//让id为book_title book_desc的文本框分别显示book.title book_desc
((TextView)rootView.findViewById(R.id.book_title)).setText(book.title);
((TextView)rootView.findViewById(R.id.book_desc)).setText(book.desc);
}
return rootView;
}
//
}

BookListFragment.java

[java] view plain copy

package com.example.bookdetailfragment;
import android.app.Activity;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
//extends ListFragMent
public class BookListFragment extends ListFragment {
//定义一个回调接口该Fragment对象所在Activity需要实现该接口
public interface Callbacks{
public void onItemSelected(Integer id);
}
private Callbacks mCallbacks;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//为该ListFragment设置Adapter
ArrayAdapter<BookContent.Book> adapter = new ArrayAdapter<BookContent.Book>(
getActivity(),android.R.layout.simple_list_item_activated_1,
android.R.id.text1,BookContent.ITEMS);//左边的Fragment 此处只显示标题
//BookContent.Book类的toString()方法返回的是this.title
setListAdapter(adapter);
}
@Override
//Called when --a fragment is first attached to its activity--.
public void onAttach(Activity activity){
super.onAttach(activity);
//如果该Acitivity没有实现Callbacks接口
if(!(activity instanceof Callbacks)){
try {
throw new Exception("BookListFragement所在的Activity" +
"必须实现Callbacks接口");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//把该Activity当成Callbacks对象
mCallbacks = (Callbacks) activity;
}
@Override
//Called when the fragment is no longer attached to its activity.
public void onDetach(){
super.onDetach();
mCallbacks = null;
}
@Override
//当用户单击某列表项时回调该方法
public void onListItemClick(ListView l, View v, int position, long id){
super.onListItemClick(l, v, position, id);
//激发mCallbacks的onItemSelected方法
mCallbacks.onItemSelected(BookContent.ITEMS.get(position).id);
}
//设置选择模式*** where to call ??
/*
public void setActivateOnItemClick(boolean activateOnItemClick){
getListView().setChoiceMode(activateOnItemClick?ListView.CHOICE_MODE_SINGLE:
ListView.CHOICE_MODE_NONE);
}*/
}

SelectBookActivity.java

[java] view plain copy

package com.example.bookdetailfragment;
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
//
public class SelectBookActivity extends Activity implements BookListFragment.Callbacks {
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//add book_twopane layout with fragment label
setContentView(R.layout.activity_book_twopane);
//
}
//implement the method from interface BookListFragment.Callbacks
public void onItemSelected(Integer id){
//deliver parameters to BookListFragment
Bundle arguments = new Bundle();
arguments.putInt(BookDetailFragment.ITEM_ID, id);
//Create BookDetailFragment
BookDetailFragment bookdetailfragment = new BookDetailFragment();
bookdetailfragment.setArguments(arguments);//<---向Fragment传入参数
//cget fragmentmanager
FragmentManager fragmentManager = getFragmentManager();
//begin transaction
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.book_detail_container, bookdetailfragment);
//commit transaction
fragmentTransaction.commit();
}
}