关于TabHost addTab的问题

import android.os.Bundle;

import android.app.Activity;

import android.app.LocalActivityManager;

import android.content.Intent;

import android.support.v4.app.FragmentActivity;

import android.view.Menu;

import android.widget.RadioGroup;

import android.widget.RadioGroup.OnCheckedChangeListener;

import android.widget.TabHost;





public class MainActivity extends FragmentActivity implements OnCheckedChangeListener{

	

	private TabHost tabhost;

	private RadioGroup rg_player_control;

	

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		// TODO Auto-generated method stub

		super.onCreate(savedInstanceState);

		setContentView(R.layout.tabhost_list);

		//绑定tabhost

		tabhost = (TabHost)findViewById(android.R.id.tabhost);

		tabhost.setup();

		

		//radiogroup操作

	    rg_player_control = (RadioGroup)findViewById(R.id.music_tab_group);

	    

	    rg_player_control.setOnCheckedChangeListener(this);

	    rg_player_control.setClickable(true);



	    TabHost.TabSpec spec;

	    spec = tabhost.newTabSpec("rb_player_local").setIndicator("rb_player_local").setContent(new Intent(this, Test.class));

	    System.out.println("tabhost");

	    tabhost.addTab(spec);

	    

	    spec = tabhost.newTabSpec("rb_player_favorite").setIndicator("rb_player_favorite").setContent(new Intent(this, Test2.class));

	    tabhost.addTab(spec);

	    spec = tabhost.newTabSpec("rb_player_online").setIndicator("rb_player_online").setContent(new Intent(this, Test3.class));

	    tabhost.addTab(spec);

	}

	

	

	@Override

	public void onCheckedChanged(RadioGroup group, int checkedId) {

		// TODO Auto-generated method stub

		

		switch(checkedId)

		{

		case R.id.rb_player_local:

			tabhost.setCurrentTabByTag("rb_player_local");

			break;

		case R.id.rb_player_favorite:

			tabhost.setCurrentTabByTag("rb_player_favorite");

			break;

		case R.id.rb_player_online:

			tabhost.setCurrentTabByTag("rb_player_online");

			break;

		}

		

	}

	

}