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MainActivity如下:

package cc.testsimpleactionbar5;import android.os.Bundle;import android.widget.ArrayAdapter;import android.app.ActionBar;import android.app.ActionBar.OnNavigationListener;import android.app.Activity;import android.app.FragmentTransaction;/** * Demo描述: * 利用ActionBar结合Fragment实现下拉式导航. * 且根据不同的导航利用Fragment显示不同的内容 *  * 备注说明: * 该示例和TestSimpleActionBar4示例的布局文件一致. * 代码实现也类似,只是导航方式不同罢了 *  * 参考资料: * 1 Android疯狂讲义(第二版) *   Thank you very much * */public class MainActivity extends Activity {    private ActionBar mActionBar;    private final static String SELECTED_PAGE_INDEX="selected_page";	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		initActionBar();	}		private void initActionBar(){		mActionBar=getActionBar();		//设置是否显示ActionBar的标题		mActionBar.setDisplayShowTitleEnabled(true);		//设置导航方式为LIST		mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);				ArrayAdapter
   
     arrayAdapter=new ArrayAdapter
    
     (							 MainActivity.this,							 android.R.layout.simple_list_item_1,							 android.R.id.text1, 							 new String[]{"第一页","第二页","第三页" });		//为ActionBar设置ArrayAdapter和导航监听		mActionBar.setListNavigationCallbacks(arrayAdapter,new NavigationListenerImpl());			}		private class NavigationListenerImpl implements OnNavigationListener{		@Override		public boolean onNavigationItemSelected(int position, long id) {			System.out.println(" onNavigationItemSelected ");			TestFragment testFragment=new TestFragment();			Bundle bundle=new Bundle();			bundle.putString(TestFragment.KEY, "这是第"+(position+1)+"页");			testFragment.setArguments(bundle);			FragmentTransaction fragmentTransaction=getFragmentManager().beginTransaction();			fragmentTransaction.replace(R.id.relativeLayoutContainer, testFragment);			fragmentTransaction.commit();			return false;		}			}			// 以下处理横竖屏的切换	// 将当前选中页的索引保存到Bundle中	@Override	protected void onSaveInstanceState(Bundle bundle) {		super.onSaveInstanceState(bundle);		bundle.putInt(SELECTED_PAGE_INDEX,mActionBar.getSelectedNavigationIndex());	}	// 获取已经保存的被选中页的索引,且设置ActionBar.	// setSelectedNavigationItem()方法会调用onNavigationItemSelected()	@Override	protected void onRestoreInstanceState(Bundle bundle) {		super.onRestoreInstanceState(bundle);		mActionBar.setSelectedNavigationItem(bundle.getInt(SELECTED_PAGE_INDEX));	}	}
    
   

package cc.testsimpleactionbar5;import android.app.Fragment;import android.os.Bundle;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;public class TestFragment extends Fragment {	public static final String KEY="key";	@Override	public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {		TextView textView=new TextView(getActivity());		textView.setGravity(Gravity.CENTER);		Bundle bundle=this.getArguments();		String content=bundle.getString(KEY);		textView.setText(content);		textView.setTextSize(30);		return textView;	}}

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