Android Fragments 详细使用

<? xml version="1.0" encoding="utf-8" ?>
< LinearLayout  xmlns:android ="http://schemas.android.com/apk/res/android"
    android:layout_width ="match_parent"
    android:layout_height ="match_parent"
    android:orientation ="horizontal"   >

    < fragment  class ="com.xuzhi.fragment.FragmentDemoActivity$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"
        ></ FrameLayout >
</ LinearLayout >

package  com.xuzhi.fragment;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.app.ListFragment;
import android.os.Bundle;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.ScrollView;
import android.widget.TextView;

public  class FragmentDemoActivity  extends Activity {

     public  static String[] array = { "text1,", "text2", "text3", "text4",
            "text5,", "text6", "text7", "text8" };

     /**  Called when the activity is first created.  */
    @Override
     public  void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState); 
        setContentView(R.layout.main);
    }

        
     public  static  class TitlesFragment  extends ListFragment {

         boolean mDualPane;
         int mCurCheckPosition = 0;
        
        @Override
         public  void onCreate(Bundle savedInstanceState) {
             //  TODO Auto-generated method stub
             super.onCreate(savedInstanceState);
            System.out.println("Fragment-->onCreate");
        }
        
        @Override
         public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
             //  TODO Auto-generated method stub
            System.out.println("Fragment-->onCreateView");
             return  super.onCreateView(inflater, container, savedInstanceState);
        }
        
        @Override
         public  void onPause() {
             //  TODO Auto-generated method stub
             super.onPause();
            System.out.println("Fragment-->onPause");
        }
        
        
        @Override
         public  void onStop() {
             //  TODO Auto-generated method stub
             super.onStop();
            
            System.out.println("Fragment-->onStop");
        }
        
        @Override
         public  void onAttach(Activity activity) {
             //  TODO Auto-generated method stub
             super.onAttach(activity);
            System.out.println("Fragment-->onAttach");
        }
        
        @Override
         public  void onStart() {
             //  TODO Auto-generated method stub
             super.onStart();
            System.out.println("Fragment-->onStart");
        }
        
        @Override
         public  void onResume() {
             //  TODO Auto-generated method stub
             super.onResume();
            System.out.println("Fragment-->onResume");
        }
        
        @Override
         public  void onDestroy() {
             //  TODO Auto-generated method stub
             super.onDestroy();
            System.out.println("Fragment-->onDestroy");
        }
        
        

        @Override
         public  void onActivityCreated(Bundle savedInstanceState) {
             //  TODO Auto-generated method stub
             super.onActivityCreated(savedInstanceState);
            System.out.println("Fragment-->onActivityCreted");
            setListAdapter( new ArrayAdapter<String>(getActivity(),
                    android.R.layout.simple_list_item_1, array));

            View detailsFrame = getActivity().findViewById(R.id.details);

            mDualPane = detailsFrame !=  null
                    && detailsFrame.getVisibility() == View.VISIBLE;

             if (savedInstanceState !=  null) {
                mCurCheckPosition = savedInstanceState.getInt("curChoice", 0);  // 从保存的状态中取出数据
            }

             if (mDualPane) {
                getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);

                showDetails(mCurCheckPosition);
            }
        }

        @Override
         public  void onSaveInstanceState(Bundle outState) {
             //  TODO Auto-generated method stub
             super.onSaveInstanceState(outState);

            outState.putInt("curChoice", mCurCheckPosition); // 保存当前的下标
        }

        @Override
         public  void onListItemClick(ListView l, View v,  int position,  long id) {
             //  TODO Auto-generated method stub
             super.onListItemClick(l, v, position, id);
            showDetails(position);
        }

         void showDetails( int index) {
            mCurCheckPosition = index; 
             if (mDualPane) {
                getListView().setItemChecked(index,  true);
                DetailsFragment details = (DetailsFragment) getFragmentManager()
                        .findFragmentById(R.id.details); 
                 if (details ==  null || details.getShownIndex() != index) {
                    details = DetailsFragment.newInstance(mCurCheckPosition); 

                     // 得到一个fragment 事务（类似sqlite的操作）
                    FragmentTransaction ft = getFragmentManager()
                            .beginTransaction();
                    ft.replace(R.id.details, details); // 将得到的fragment 替换当前的viewGroup内容，add则不替换会依次累加
                    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE); // 设置动画效果
                    ft.commit(); // 提交
                }
            }  else {
                 new AlertDialog.Builder(getActivity()).setTitle(
                        android.R.string.dialog_alert_title).setMessage(
                        array[index]).setPositiveButton(android.R.string.ok,
                         null).show();
            }
        }
    }

     /**
     * 作为界面的一部分，为fragment 提供一个layout
     *  @author  terry
     *
      */
     public  static  class DetailsFragment  extends Fragment {

         public  static DetailsFragment newInstance( int index) { 
            DetailsFragment details =  new DetailsFragment();
            Bundle args =  new Bundle();
            args.putInt("index", index);
            details.setArguments(args);
             return details;
        }

         public  int getShownIndex() {
             return getArguments().getInt("index", 0);
        }

        @Override
         public View onCreateView(LayoutInflater inflater, ViewGroup container,
                Bundle savedInstanceState) {
             //  TODO Auto-generated method stub
             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(array[getShownIndex()]);
             return scroller;
        }
    }
}