Try this:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
boolean firstrun= true;
if (firstrun) {
AlertDialog.Builder builder = new AlertDialog.Builder(this).setTitle("This is First Run !").setMessage("Welcome! Please enter the emergency numbers!");
AlertDialog dialogue = builder.create();
dialogue.show();
builder.setPositiveButton("OK!", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Intent sv = new Intent(getApplicationContext(),com.sach.droidclinic.Save.class);
startActivity(sv);
}
});
}