Spinner in Android

activity_main.java

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="55dp" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="ShowSelectedMonth" />

</LinearLayout>

MainActivity.java

package in.blogspot.kantapp.spinnerinandroid;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;

public class MainActivity extends Activity implements OnItemSelectedListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        final Spinner spinner = (Spinner) findViewById(R.id.spinner1);

        Button showBtn = (Button) findViewById(R.id.button1);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(
                getApplicationContext(), R.layout.text, MONTHS);

        spinner.setAdapter(adapter);

// cannot use this interface for spinner
// spinner.setOnItemClickListener(this);

        spinner.setOnItemSelectedListener(this);

        showBtn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
// TODO Auto-generated method stub
                int position = spinner.getSelectedItemPosition();

                Toast.makeText(getApplicationContext(),
                        "selected month is :" + MONTHS[position],
                        Toast.LENGTH_SHORT).show();
            }
        });

    }

    String[] MONTHS = { "jan", "feb", "mar", "april", "may", "june", "july",
            "aug", "sep", "oct", "nov", "dec" };

    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
                               long arg3) {
// TODO Auto-generated method stub
        Toast.makeText(getApplicationContext(),
                "selected month is :" + MONTHS[arg2], Toast.LENGTH_SHORT)
                .show();

    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub

    }

}

text.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:textColor="#ff00ff"
    android:textSize="20dp" >

</TextView>