如何在TabActivity底下用mapview啊

好像mapview不能直接用在TabActivity页面上，我想做一个分页程序，其中有一个分页用来存放地图，请问该怎么显示啊

public class MobileTrack extends TabActivity {

    /** Called when the activity is first created. */

	private MapView mapview; 

	@Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        TabHost tabHost = getTabHost();

        LayoutInflater.from(this).inflate(R.layout.main, tabHost.getTabContentView(), true);

        

        //mapview=(MapView)findViewById(R.id.map); 

       /*TabSpec tab1;

        tab1=tabHost.newTabSpec("tab1");

        tab1.setIndicator("Location", getResources().getDrawable(R.drawable.location));

        //Intent i1=new Intent(this.getApplicationContext(), ScrollView.class); 

        tab1.setContent(R.id.scrollView2);

        tabHost.addTab(tab1);

        

        

        TabSpec tab1;

        tab1=tabHost.newTabSpec("tab1");

        tab1.setIndicator("Location", getResources().getDrawable(R.drawable.location));

        //Intent i1=new Intent(this.getApplicationContext(), ScrollView.class); 

        tab1.setContent(R.id.scrollView2);

        tabHost.addTab(tab1);

        */

        tabHost.addTab(tabHost.newTabSpec("Map").setIndicator("Map").setContent(new TabHost.TabContentFactory() {         public View createTabContent(String arg0) {             return mapview;         }     })); 

        

        TabSpec tab2;

        tab2=tabHost.newTabSpec("tab2");

        tab2.setIndicator("GPS", getResources().getDrawable(R.drawable.gps));

        //Intent i1=new Intent(this.getApplicationContext(), ScrollView.class); 

        tab2.setContent(R.id.scrollView2);

        tabHost.addTab(tab2);

        

        TabSpec tab3;

        tab3=tabHost.newTabSpec("tab3");

        tab3.setIndicator("Network", getResources().getDrawable(R.drawable.network));

        //Intent i1=new Intent(this.getApplicationContext(), ScrollView.class); 

        tab3.setContent(R.id.scrollView3);

        tabHost.addTab(tab3);

        

        TabSpec tab4;

        tab4=tabHost.newTabSpec("tab4");

        tab4.setIndicator("Hardware", getResources().getDrawable(R.drawable.hardware));

        //Intent i1=new Intent(this.getApplicationContext(), ScrollView.class); 

        tab4.setContent(R.id.scrollView4);

        tabHost.addTab(tab4);

      

网上找了一些代码，总是不行，运行报错，求高手指点