<fragment android:name= "com.example.android.fragments.HeadlinesFragment"
              android:id ="@+id/headlines_fragment"
              android:layout_weight ="1"
              android:layout_width ="0dp"
              android:layout_height ="match_parent" />

    <fragment android:name= "com.example.android.fragments.ArticleFragment"
              android:id ="@+id/article_fragment"
              android:layout_weight ="2"
              android:layout_width ="0dp"
              android:layout_height ="match_parent" />

</ LinearLayout>

     Google官方的这个例子中还对平板和普通屏幕手机进行了适配，普通手机只显示一屏，首先使用到的是文章标题列表的Fragment，当点击文章时，会用文章详情Fragment来代替文章标题列表的Fragment，这里有一点需要注意的是，需要把加入到文章详情Fragment对应的事务加入到后台的回退栈中，以便事务能够回退，重新回到文章标题列表的Fragment
[java] view plaincopyprint?
01. // Replace whatever is in the fragment_container view with this fragment,  
02.// and add the transaction to the back stack so the user can navigate back  
03.transaction.replace(R.id. fragment_container , newFragment); 
04.transaction.addToBackStack( null ); 
05. 
06.// Commit the transaction  
07.transaction.commit(); 
             // Replace whatever is in the fragment_container view with this fragment,
            // and add the transaction to the back stack so the user can navigate back
            transaction.replace(R.id. fragment_container , newFragment);
            transaction.addToBackStack( null );

            // Commit the transaction
            transaction.commit();

再说一下怎么在FragmentActivity中加入一个Fragment时，需要指定一个View容器，Fragment事务需要被提交
[java] view plaincopyprint?
01. // Create an instance of ExampleFragment  
02.HeadlinesFragment firstFragment = new HeadlinesFragment(); 
03. 
04.// In case this activity was started with special instructions from an Intent,  
05.// pass the Intent's extras to the fragment as arguments  
06.firstFragment.setArguments(getIntent().getExtras()); 
07. 
08.// Add the fragment to the 'fragment_container' FrameLayout  
09.getSupportFragmentManager().beginTransaction() 
10.        .add(R.id. fragment_container , firstFragment).commit(); 
             // Create an instance of ExampleFragment
            HeadlinesFragment firstFragment = new HeadlinesFragment();

            // In case this activity was started with special instructions from an Intent,
            // pass the Intent's extras to the fragment as arguments
            firstFragment.setArguments(getIntent().getExtras());

            // Add the fragment to the 'fragment_container' FrameLayout
            getSupportFragmentManager().beginTransaction()
                    .add(R.id. fragment_container , firstFragment).commit();

     还有一点是这个例子中由于要对平板和普通手机进行匹配，所以自定义了一个回调接口OnHeadlineSelectedListener，   在回调方法中通过判断文章详情Fragment是否存在来区分当文章被点击时是替换当前的显示的Fragment(一屏)还是更新Fragment(两屏)
[html] view plaincopyprint?
01.public void onArticleSelected( int position) { 
02.   // The user selected the headline of an article from the HeadlinesFragment 
03. 
04.   // Capture the article fragment from the activity layout 
05.   // 查找文章详情Fragment 
06.   ArticleFragment articleFrag = (ArticleFragment) 
07.           getSupportFragmentManager().findFragmentById(R.id. article_fragment); 
08. 
09.   if (articleFrag != null) { // 存在则更新详情Fragment 
10.       // If article frag is available, we're in two-pane layout... 
11. 
12.       // Call a method in the ArticleFragment to update its content 
13.       articleFrag.updateArticleView(position); 
14. 
15.   } else {小学教师实习报告  // 不存在则替换为文章详情Fragment 
16.       // If the frag is not available, we're in the one-pane layout and must swap frags... 
17. 
18.       // Create fragment and give it an argument for the selected article 
19.       ArticleFragment newFragment = new ArticleFragment(); 
20.       Bundle args = new Bundle(); 
21.       args.putInt(ArticleFragment. ARG_POSITION , position); 
22.       newFragment.setArguments(args); 
23.       FragmentTransaction transaction = getSupportFragmentManager().beginTransaction(); 
24. 
25.       // Replace whatever is in the fragment_container view with this fragment, 
26.       // and add the transaction to the back stack so the user can navigate back 
27.       transaction.replace(R.id. fragment_container , newFragment); 
28.       transaction.addToBackStack( null ); 
29. 
30.       // Commit the transaction 
31.       transaction.commit(); 
32.   } 

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