android fragmnet

2024年1月24日 129次阅读 
package org.crazyit.app.model;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Description:
 * <br/>website: <a href="http://www.crazyit.org">crazyit.org</a>
 * <br/>Copyright (C), 2001-2014, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author Yeeku.H.Lee [email protected]
 * @version 1.0
 */
public class BookContent
{
	// 定义一个内部类，作为系统的业务对象
	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 title;
		}
	}
	// 使用List集合记录系统所包含的Book对象
	public static List<Book> ITEMS = new ArrayList<Book>();
	// 使用Map集合记录系统所包含的Book对象	
	public static Map<Integer, Book> ITEM_MAP 
		= new HashMap<Integer, Book>();

	static
	{
		// 使用静态初始化代码，将Book对象添加到List集合、Map集合中
		addItem(new Book(1, "疯狂Java讲义"
			, "一本全面、深入的Java学习图书，已被多家高校选做教材。"));
		addItem(new Book(2, "疯狂Android讲义"
			, "Android学习者的首选图书，常年占据京东、当当、 "
			+ "亚马逊3大网站Android销量排行榜的榜首"));
		addItem(new Book(3, "轻量级Java EE企业应用实战"
			, "全面介绍Java EE开发的Struts 2、Spring 3、Hibernate 4框架"));
	}

	private static void addItem(Book book)
	{
		ITEMS.add(book);
		ITEM_MAP.put(book.id, book);
	}
}







package org.crazyit.app;

import org.crazyit.app.model.BookContent;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
 * Description:
 * <br/>website: <a href="http://www.crazyit.org">crazyit.org</a>
 * <br/>Copyright (C), 2001-2014, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author Yeeku.H.Lee [email protected]
 * @version 1.0
 */
public class BookDetailFragment extends Fragment
{
	public static final String ITEM_ID = "item_id";
	// 保存该Fragment显示的Book对象
	BookContent.Book book;
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		// 如果启动该Fragment时包含了ITEM_ID参数
		if (getArguments().containsKey(ITEM_ID))
		{
			book = BookContent.ITEM_MAP.get(getArguments()
				.getInt(ITEM_ID)); //①
		}
	}

	// 重写该方法，该方法返回的View将作为Fragment显示的组件
	@Override
	public View onCreateView(LayoutInflater inflater
		, ViewGroup container, Bundle savedInstanceState)
	{
		// 加载/res/layout/目录下的fragment_book_detail.xml布局文件
		View rootView = inflater.inflate(R.layout.fragment_book_detail,
				container, false);
		if (book != null)
		{
			// 让book_title文本框显示book对象的title属性
			((TextView) rootView.findViewById(R.id.book_title))
					.setText(book.title);
			// 让book_desc文本框显示book对象的desc属性
			((TextView) rootView.findViewById(R.id.book_desc))
				.setText(book.desc);	
		}
		return rootView;
	}
}









package org.crazyit.app;

import org.crazyit.app.model.BookContent;

import android.app.Activity;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
 * Description:
 * <br/>website: <a href="http://www.crazyit.org">crazyit.org</a>
 * <br/>Copyright (C), 2001-2014, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author Yeeku.H.Lee [email protected]
 * @version 1.0
 */
public class BookListFragment extends ListFragment
{
	private Callbacks mCallbacks;
	// 定义一个回调接口，该Fragment所在Activity需要实现该接口
	// 该Fragment将通过该接口与它所在的Activity交互
	public interface Callbacks
	{
		public void onItemSelected(Integer id);
	}

	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		// 为该ListFragment设置Adapter
		setListAdapter(new ArrayAdapter<BookContent.Book>(getActivity(),
				android.R.layout.simple_list_item_activated_1,
				android.R.id.text1, BookContent.ITEMS));
	}
	// 当该Fragment被添加、显示到Activity时，回调该方法
	@Override
	public void onAttach(Activity activity)
	{
		super.onAttach(activity);
		// 如果Activity没有实现Callbacks接口，抛出异常
		if (!(activity instanceof Callbacks))
		{
			throw new IllegalStateException(
				"BookListFragment所在的Activity必须实现Callbacks接口!");
		}
		// 把该Activity当成Callbacks对象
		mCallbacks = (Callbacks)activity;
	}
	// 当该Fragment从它所属的Activity中被删除时回调该方法
	@Override
	public void onDetach()
	{
		super.onDetach();
		// 将mCallbacks赋为null。
		mCallbacks = null;
	}
	// 当用户点击某列表项时激发该回调方法
	@Override
	public void onListItemClick(ListView listView
		, View view, int position, long id)
	{
		super.onListItemClick(listView, view, position, id);
		// 激发mCallbacks的onItemSelected方法
		mCallbacks.onItemSelected(BookContent
			.ITEMS.get(position).id);
	}

	public void setActivateOnItemClick(boolean activateOnItemClick)
	{
		getListView().setChoiceMode(
				activateOnItemClick ? ListView.CHOICE_MODE_SINGLE
						: ListView.CHOICE_MODE_NONE);
	}
}









package org.crazyit.app;

import android.app.Activity;
import android.os.Bundle;

/**
 * Description:
 * <br/>website: <a href="http://www.crazyit.org">crazyit.org</a>
 * <br/>Copyright (C), 2001-2014, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author Yeeku.H.Lee [email protected]
 * @version 1.0
 */
public class SelectBookActivity extends Activity implements
		BookListFragment.Callbacks
{
	@Override
	public void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		// 加载/res/layout目录下的activity_book_twopane.xml布局文件
		setContentView(R.layout.activity_book_twopane);
	}
	// 实现Callbacks接口必须实现的方法
	@Override
	public void onItemSelected(Integer id)
	{
		// 创建Bundle，准备向Fragment传入参数
		Bundle arguments = new Bundle();
		arguments.putInt(BookDetailFragment.ITEM_ID, id);
		// 创建BookDetailFragment对象
		BookDetailFragment fragment = new BookDetailFragment();
		// 向Fragment传入参数
		fragment.setArguments(arguments);
		// 使用fragment替换book_detail_container容器当前显示的Fragment
		getFragmentManager().beginTransaction()
			.replace(R.id.book_detail_container, fragment)
			.commit();  //①
	}
}

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