Android spinner

import android.view.View;

import android.widget.*;

import android.widget.AdapterView.OnItemSelectedListener;

public class MainActivity extends Activity implements OnItemSelectedListener{

Spinner s1;

String[] country = { "India", "USA", "China", "Japan", "Other",  }; 

            @Override

            protected void onCreate(Bundle savedInstanceState) {

                        super.onCreate(savedInstanceState);

                        setContentView(R.layout.activity_main);

                        s1=(Spinner)findViewById(R.id.spinner1);

                        s1.setOnItemSelectedListener(this);

//Creating the ArrayAdapter instance having the country list 

ArrayAdapter<String> aa = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,country); 

        aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 

   //Setting the ArrayAdapter data on the Spinner 

        s1.setAdapter(aa); 

}

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

        String item = parent.getItemAtPosition(position).toString();

        Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();

    }

public void onNothingSelected(AdapterView<?> arg0)

   {

   }

}