android - 如何在Tab中显示ListView？

Question

我想在Tab中显示ListView(选择这个tab后我希望ListView出现)，所以我创建了Fragment类并在其中放置了ListView代码。现在的主要问题是将 fragment 对象传递给tabListener。请在此处发布示例，或者更好地展示如何在我的代码中执行此操作。无论如何，我们将不胜感激。

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); 

        ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        ActionBar.Tab tabOne = actionBar.newTab().setText("One");
        ActionBar.Tab tabTwo = actionBar.newTab().setText("Two");


        tabOne.setTabListener(new tabListener());
        tabTwo.setTabListener(new tabListener());

        actionBar.addTab(tabOne);
        actionBar.addTab(tabTwo);   
        } 


    protected class tabListener implements ActionBar.TabListener {

        @Override
        public void onTabUnselected(Tab tab, FragmentTransaction ft) {

        }

        @Override
        public void onTabSelected(Tab tab, FragmentTransaction ft) {

        }

        @Override
        public void onTabReselected(Tab tab, FragmentTransaction ft) {

        }
    };

    public class FirstFragment extends ListFragment {
        private ArrayList<Cinemas> cinema;
        private CinemasAdapter cinemaAdapter;
        private ListView list;

          @Override
          public void onActivityCreated(Bundle savedInstanceState) {
            super.onActivityCreated(savedInstanceState);
            cinema = new Handler().handle(); 
            cinemaAdapter = new CinemasAdapter(MainActivity.this, R.layout.movie_data_row, cinema);
            setListAdapter(cinemaAdapter);
          }

          @Override
          public void onListItemClick(ListView l, View v, int position, long id) {
              Cinemas movie = cinemaAdapter.getItem(position);
                Intent intent = new Intent (MainActivity.this, More.class);
                intent.putExtra("Cinemas", movie);
                intent.putExtra("data", movie.getBitmap());

                Bundle translateBundle =
                      ActivityOptions.makeCustomAnimation(MainActivity.this,
                      R.anim.slide_in_left, R.anim.slide_out_left).toBundle();
              startActivity (intent, translateBundle);
          }
        } 

}

Answer 1

如果您想在 tabTwo 中打开列表，您需要创建 FirstFragment 类的实例，并在您选择选项卡时将其添加到您的 View 中。

在 onTabSelected 中，创建一个新的 FirstFragment 实例(如果它不为 null)，并将其添加到 activity_main 中容器内的 View 中文件。容器是 View 内的线性布局，具有应由 fragment 占用的给定空间量。在全屏 fragment 的情况下，容器是根布局。您只需要为此布局指定一个 id。创建新 fragment 后，通过调用 transaction.attach(); 附加它。最终代码块应类似于此:

/** this example assumes that the fragment
 * FirstFragment will be attached to tab 1
 * which is at position = 0, and SecondFragment
 * will be attached to tab 2, which is at 
 * position = 1. Also, the root layout of 
 * activity_main.xml has the id attribute of
 * fragment_container
 */

FirstFragment firstFragment;
SecondFragment secondFragment;

@Override
public void onTabSelected(Tab tab, FragmentTransaction transaction) {
    switch (tab.getPosition()) {
    case 0:
        if (firstFragment == null) {
            firstFragment = new FirstFragment();
            transaction.add(R.id.fragment_container,
                    firstFragment, "FIRST");

        } else {
            transaction.attach(firstFragment);
        }
        break;
    case 1:
        if (secondFragment == null) {
            secondFragment = new SecondFragment();
            transaction.add(R.id.fragment_container, secondFragment, "SECOND");
        } else {
            transaction.attach(secondFragment);
        }
        break;
    }
}