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MainActivity如下:

package cc.testsimpleactionbar4;import android.os.Bundle;import android.app.ActionBar;import android.app.Activity;import android.app.ActionBar.Tab;import android.app.ActionBar.TabListener;import android.app.FragmentTransaction;/** * Demo描述: * 利用ActionBar结合Fragment实现Tab导航. * 当选中不同的Tab时利用Fragment显示不同的内容 *  * 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_TAB_INDEX="selected_tab";	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.main);		initActionBar();	}		private void initActionBar(){		mActionBar=getActionBar();		//设置导航方式为Tab		mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);				Tab tab1=mActionBar.newTab();		tab1.setText("第一页");		tab1.setTabListener(new TabListenerImpl());		mActionBar.addTab(tab1);				Tab tab2=mActionBar.newTab();		tab2.setText("第二页");		tab2.setTabListener(new TabListenerImpl());		mActionBar.addTab(tab2);				Tab tab3=mActionBar.newTab();		tab3.setText("第三页");		tab3.setTabListener(new TabListenerImpl());		mActionBar.addTab(tab3);	}		private class TabListenerImpl implements TabListener{		@Override		public void onTabReselected(Tab arg0, FragmentTransaction arg1) {					}		@Override		public void onTabSelected(Tab tab, FragmentTransaction transaction) {			System.out.println(" onTabSelected ");			TestFragment testFragment=new TestFragment();			Bundle bundle=new Bundle();			bundle.putString(TestFragment.KEY, "这是第"+(tab.getPosition()+1)+"个Tab");			testFragment.setArguments(bundle);			FragmentTransaction fragmentTransaction=getFragmentManager().beginTransaction();			fragmentTransaction.replace(R.id.relativeLayoutContainer, testFragment);			fragmentTransaction.commit();		}		@Override		public void onTabUnselected(Tab arg0, FragmentTransaction arg1) {					}			}	//以下处理横竖屏的切换		//将当前选中的Tab页的索引保存到Bundle中	@Override	protected void onSaveInstanceState(Bundle bundle) {		super.onSaveInstanceState(bundle);		bundle.putInt(SELECTED_TAB_INDEX, mActionBar.getSelectedNavigationIndex());	}		//获取已经保存的被选中Tab页的索引,且设置ActionBar.	//setSelectedNavigationItem()方法会调用onTabSelected()	@Override	protected void onRestoreInstanceState(Bundle bundle) {		super.onRestoreInstanceState(bundle);		mActionBar.setSelectedNavigationItem(bundle.getInt(SELECTED_TAB_INDEX));	}}

TestFragment如下:

package cc.testsimpleactionbar4;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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