Android编程之ActionBar Tabs用法实例分析

import android.app.ActionBar;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.app.ActionBar.Tab;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.view.MotionEvent;
import android.view.Window;
public class ActionBarActivity extends Activity {
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    //使ActionBar变得透明
    requestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY);
    setContentView(R.layout.main);
    final ActionBar actionBar = getActionBar();
    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
    // remove the activity title to make space for tabs
    actionBar.setDisplayShowTitleEnabled(false);
    AFragment aFragment = new AFragment();
    actionBar.addTab(actionBar.newTab().setText("Tab-A")
        .setTabListener(new ListenerA(aFragment)));
    BFragment bFragment = new BFragment();
    actionBar.addTab(actionBar.newTab().setText("Tab-B")
        .setTabListener(new ListenerB(bFragment)));
  }
  //点击显示or隐藏ActionBar
  public boolean onTouchEvent(MotionEvent event){
    ActionBar bar = getActionBar();
    switch(event.getAction()){
      case MotionEvent.ACTION_UP:
        if(bar.isShowing()) bar.hide();
        else bar.show();
        break;
      default:
          break;
    }
    return true;
  }
  private class ListenerA implements ActionBar.TabListener {
    private AFragment mFragment;
    // Called to create an instance of the listener when adding a new tab
    public ListenerA(AFragment fragment) {
      mFragment = fragment;
    }
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
      ft.add(R.id.fragment, mFragment, null);
    }
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
      ft.remove(mFragment);
    }
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
      // do nothing }
    }
  }
  private class ListenerB implements ActionBar.TabListener {
    private BFragment mFragment;
    // Called to create an instance of the listener when adding a new tab
    public ListenerB(BFragment fragment) {
      mFragment = fragment;
    }
    public void onTabSelected(Tab tab, FragmentTransaction ft) {
      ft.add(R.id.fragment, mFragment, null);
    }
    public void onTabUnselected(Tab tab, FragmentTransaction ft) {
      ft.remove(mFragment);
    }
    public void onTabReselected(Tab tab, FragmentTransaction ft) {
      // do nothing }
    }
  }
}

public class AFragment extends Fragment {
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    return inflater.inflate(R.layout.alayout, container, false);
    }
}