ActionBar详解(五)--->利用ActionBar结合Fragment实现Tab导航

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;
	}
}

main.xml如下:

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/relativeLayoutContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

</RelativeLayout>