Android Fragments 詳細使用

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); //從保存的狀態中取出數據
        }

        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);//保存當前的下標
    }

    @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); 

                //得到一個fragment 事務（類似sqlite的操作）
                FragmentTransaction ft = getFragmentManager()
                        .beginTransaction();
                ft.replace(R.id.details, details);//將得到的fragment 替換當前的viewGroup內容，add則不替換會依次累加
                ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);//設置動畫效果
                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();
        }
    }
}

/**
 * 作為界面的一部分，為fragment 提供一個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;
    }
}

}</pre>注意：