java - 单击选项卡时如何开始新 Activity ？

Question

我有这门课:

public class MainActivity extends ActionBarActivity implements TabListener{

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

        // Set up the action bar.
        final ActionBar actionBar = getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        ActionBar.Tab TestTab = actionBar.newTab().setText("The test");
        ActionBar.Tab chatTab = actionBar.newTab().setText("Chat");

        TestTab.setTabListener(this);
        chatTab.setTabListener(this);

        actionBar.addTab(TestTab);
        actionBar.addTab(chatTab);

        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater actionMenue = getMenuInflater();
        actionMenue.inflate(R.menu.main_activity_bar, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        if (id == R.id.mapIcon) {
            Intent displayTheMap = new Intent(this, Map.class);
            startActivity(displayTheMap);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    /**
     * A placeholder fragment containing a simple view.
     */
    public static class PlaceholderFragment extends Fragment {

        public PlaceholderFragment() {
        }

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            return rootView;
        }
    }

    public void showTheMap(View mainView){
        Intent displayTheMap = new Intent(this, Map.class);
        startActivity(displayTheMap);
    }

    @Override
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
        // TODO Auto-generated method stub

    }
}

如您所见，我在操作栏下方放置了 2 个选项卡。现在一切看起来都很好，但是，当单击选项卡时如何执行一对代码？我的意思是，很明显我必须在这里编写代码:

@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
    // TODO Auto-generated method stub
}

但是我怎么知道哪个选项卡被选中呢？有人可以给我一个线索吗，因为作为初学者，这似乎很难理解。我知道我在这里遗漏了一小部分。

Answer 1

使用下面的代码

请使用以下代码。

@Override
public void onTabSelected(Tab tab, FragmentTransaction arg1) {
    int position = tab.getPosition();
    switch(position){
    case 0:
       //code for test
       break;

    case 1:
      //code for chat
      break;
 }
}