public class MainActivity extends Activity
{
    String[] data;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        setListAdapter(new ArrayAdapter<String>
           (this, android.R.layout.simple_list_item_1,loadData()));
    }

    public String[] loadData()
    {
        data = new String[]{"Pakistan", "UK","USA","India","Canada","Nepal","Sri Lanka"};

        return data;
    }

    public void onListItemClick(ListView parent, View v, int position, long id)
    {
        Toast.makeText(this, data[position], Toast.LENGTH_SHORT).show();

        if (data[position].equalsIgnoreCase("Pakistan"))
        {
            Intent intent = new Intent(MainActivity.this, SecondActivity.class);
            startActivity(intent);
        }
    }
}

public class MainActivity extends ListActivity