public static class ExampleFragment extends Fragment
{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
return inflater.inflate(R.layout.example_fragment, //加载当前的Fragment对应的资源文件
container, //父容器控件
false); //*表明是否链接该布局和其父容器。这里设置为false，是因为系统已经插入了这个布局到父控件，设置为true将会产生多余的一个View Group*/
}
}<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment android:name="com.example.news.ArticleListFragment"
android:id="@+id/list"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<fragment android:name="com.example.news.ArticleReaderFragment"
android:id="@+id/viewer"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>
public class BookListFragment extends ListFragment
{
private OnBookSelectedListener whichbook; //接口对象
public interface OnBookSelectedListener
{
public void onBookSelected(Integer id); //参数为Map集合的键
}
.....
}(2)
然后在activity实现接口OnBookSelectedListener，在方法onBookSelected()中通知fragmentB(BookDetailFragment
),即Activity从FragmentA获取传入的ID,用来启动FragmentB。public class SelectBookActivity extends Activity implements BookListFragment.OnBookSelectedListener
{
......
public void onItemSelected(Integer id)
{
//a.创建Bundle,准备向Fragment传入参数
Bundle bundle=new Bundle();
bundle.putInt(BookDetailFragment.ITEM_ID, id); //装入值id到"item_id"键
//b.创建BookDetailFragment对象，并项Fragment传入参数
BookDetailFragment fragment=new BookDetailFragment();
fragment.setArguments( bundle);
//c.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();
/*注释：这一句等价于....
* FragmentManager Manager=getFragmentManager();
* FragmentTransaction Transaction=Manager.beginTransaction();
* Transaction.replace(R.id.book_detail_container, Manager);
* Transaction.commit();
* */
}
} <span style="background-color: inherit; line-height: 1.875; font-family: 'Times New Roman';"> </span>public void onAttach(Activity activity)
{
super.onAttach(activity);
//a.如果Activity中没有实现Callbacks接口，抛出异常
if(!(activity instanceof Callbacks))
{
throw new IllegalStateException("异常:BookListFragment所在的Activity必须实现Callback接口！");
}
//把该Activity当成whichbook对象(缺少这一句话，导致出现NullPointerException错误)
whichbook=( BookListFragment)activity;
}(4)在fragmentA中实现onListItemClick()响应activity发出的事件(Fragment向Activity传递ID) public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
osition).id);//激发 OnBookSelectedListener接口的onBookSelected方法
}
原文地址：http://blog.csdn.net/u012637501/article/details/46547509
