【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

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

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

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

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();
    }



}

activity_book_detail_fragment.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".BookDetailFragment" >

   <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical"
        >
        <TextView

             android:id="@+id/book_title"
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"
             android:padding="16dp"
             android:textSize="20sp"
             android:background="#0f0"

            />
        <TextView

             android:id="@+id/book_desc"
             android:layout_width="fill_parent"
             android:layout_height="wrap_content"
             android:padding="16dp"
             android:textSize="15sp"
            />

    </LinearLayout>

</RelativeLayout>

activity_book_twopane.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- 水平排列 使用中等分隔条 -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:showDividers="middle"
    android:baselineAligned="false"
    >

    <!-- 添加一个Fragment -->
    <fragment
        android:name="com.example.bookdetailfragment.BookListFragment"
        android:id="@+id/book_list"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        />
    <!-- 添加一个FrameLayout容器 -->
    <FrameLayout
        android:id="@+id/book_detail_container"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="3"
        >

    </FrameLayout>
</LinearLayout>

AndroidManifest.xml

 android:name="com.example.bookdetailfragment.SelectBookActivity"

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.bookdetailfragment"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.bookdetailfragment.SelectBookActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

运行结果：

 

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