Android Fragment使用之实例演示

<?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 
    class=“com.fragment.main.TitlesFragment”  
    android:id=“@+id/titles” android:layout_weight=“1″  
    android:layout_width=“0px” android:layout_height=“match_parent” /> 
  <FrameLayout android:id=“@+id/details” android:layout_weight=“1″  
    android:layout_width=“0px” android:layout_height=“match_parent”  
    android:background=“?android:attr/detailsElementBackground” /> 
</LinearLayout> 

public class TitlesFragment extends ListFragment {  
  
  int mCurCheckPosition = 0;  
  int mShownCheckPosition = -1;  
  
  @Override 
  public void onActivityCreated(Bundle savedInstanceState) {  
    super.onActivityCreated(savedInstanceState);  
                              
    setListAdapter(new ArrayAdapter<String>(getActivity(),  
        android.R.layout.simple_list_item_activated_1,  
        Shakespeare.TITLES)); //使用静态数组填充列表  
    if (savedInstanceState != null) {  
      mCurCheckPosition = savedInstanceState.getInt(“curChoice”, 0);  
      mShownCheckPosition = savedInstanceState.getInt(“shownChoice”, -1);  
    }  
      getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);  
      showDetails(mCurCheckPosition);  
  }  
  
  @Override 
  public void onSaveInstanceState(Bundle outState) {  
    super.onSaveInstanceState(outState);  
  
    outState.putInt(“curChoice”, mCurCheckPosition);  
    outState.putInt(“shownChoice”, mShownCheckPosition);  
  }  
  
  @Override 
  public void onListItemClick(ListView l, View v, int position, long id) {  
    showDetails(position);  
  }  
  
  /** 
   *显示listview item 详情 
   */ 
  void showDetails(int index) {  
    mCurCheckPosition = index;  
      getListView().setItemChecked(index, true);  
  
      if (mShownCheckPosition != mCurCheckPosition) {  
  
        DetailsFragment df = DetailsFragment.newInstance(index);  
         FragmentTransaction ft = getFragmentManager()  
            .beginTransaction();  
        ft.replace(R.id.details, df);  
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);  
        ft.commit();  
        mShownCheckPosition = index;  
      }    
  }  
  
} 

DetailsFragment df = DetailsFragment.newInstance(index);//获取详情Fragment的实例  
FragmentTransaction ft = getFragmentManager().beginTransaction();//获取FragmentTransaction 实例  
ft.replace(R.id.details, df); //使用DetailsFragment 的实例  
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);  
ft.commit();//提交 

public class DetailsFragment extends Fragment {  
  
  /**   * Create a new instance of DetailsFragment, initialized to   * show the text at 'index'.   */ 
  public static DetailsFragment newInstance(int index) {  
    DetailsFragment f = new DetailsFragment();  
    // Supply index input as an argument.      
    Bundle args = new Bundle();  
    args.putInt(“index”, index);  
    f.setArguments(args);  
    return f;  
  }  
  
  @Override 
  public View onCreateView(LayoutInflater inflater, ViewGroup container,  
      Bundle savedInstanceState) {  
    if (container == null) {        
      return null;  
    }  
    ScrollView scroller = new ScrollView(getActivity());  
    TextView text = new TextView(getActivity());  
  
    int padding = (int) TypedValue.applyDimension(  
        TypedValue.COMPLEX_UNIT_DIP, 4, getActivity().getResources()  
            .getDisplayMetrics());  
    text.setPadding(padding, padding, padding, padding);  
    scroller.addView(text);  
    text.setText(Shakespeare.DIALOGUE[getArguments().getInt("index", 0)]);  
    return scroller;  
  }  
}