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