SimpleSpinnerActivity.java

package com.mobidev.spinerexample;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.Toast;

/**
 * Created by lawrence on 4/30/15.
 */
public class SimpleSpinnerActivity extends ActionBarActivity {

    private Spinner mySpinner;
    private Button btnGetSelected;
    private String[] androidOSVersionsArray = {"Alpha (1.0)", "Beta (1.1)", "Cupcake (1.5)", "Donut (1.6)", "Eclair (2.0–2.1)", "Froyo (2.2–2.2.3)", "Gingerbread (2.3–2.3.7)", "Honeycomb (3.0–3.2.6)", "Ice Cream Sandwich (4.0–4.0.4)", "Jelly Bean (4.1–4.3.1)", "KitKat (4.4–4.4.4, 4.4W–4.4W.2)", "Lollipop (5.0–5.1)"};

    private String selected_os;

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


        mySpinner = (Spinner) findViewById(R.id.mySpinner);
        btnGetSelected = (Button) findViewById(R.id.getSelected);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.my_simple_spinner_item, androidOSVersionsArray);
        adapter.setDropDownViewResource(R.layout.my_simple_spinner_dropdown_item);
        mySpinner.setAdapter(adapter);
        mySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                selected_os = androidOSVersionsArray[position].toString();
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });

        btnGetSelected.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getApplicationContext(), "You selected " + selected_os, Toast.LENGTH_SHORT).show();
            }
        });

    }
}