Here is main code:

public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Resources res = getResources(); TabHost tabHost = getTabHost();
Intent intent= new Intent(); intent.setClass(this,EGCQuery.class);
tabHost.addTab(tabHost.newTabSpe("egcquery").setIndicator ("EGCQuery",
res.getDrawable(R.drawable.egcquery))
.setContent(intent));

 tabHost.addTab(tabHost.newTabSpec("patientinfo").setIndicator("PatientInfo",                      
   res.getDrawable(R.drawable.patientinfo))                  
   .setContent(R.layout.main2));    



 tabHost.addTab(tabHost.newTabSpec("compinterp").setIndicator("Comp_Interp",                      
   res.getDrawable(R.drawable.compinterp))                  
   .setContent(R.layout.main3)); 
 tabHost.setCurrentTab(0)