列表视图和片段

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    list = (ListView)findViewById(R.id.list);
    A = new FragmentA();
    B = new FragmentB();
    adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, items);
    list.setAdapter(adapter);
    list.setOnItemClickListener(mylistener);
}

public void changeFragment(Fragment f){
    FragmentTransaction ft = getFragmentManager().beginTransaction();
    ft.replace(R.id.fragment, f);
    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
    ft.addToBackStack(null);
    ft.commit();
}

   public OnItemClickListener mylistener = new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position,
            long id) {
        switch(position){
        case 0 : changeFragment(A); 
            break;
        case 1 : changeFragment(B); 
            break;
        }

    }
};