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);    }}