Android - Spinner Dropdown Example

I will show simple code how to create  Spinner (drop down list) in android programmatically.
Please try it your self.

package com.j4android;

import java.util.ArrayList;

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

public class MainActivity extends Activity implements OnItemSelectedListener {
Spinner spinner1;
ArrayAdapter spinnerArrayAdapter1;
ArrayList<String> results = new ArrayList<String>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
results.add("India");
results.add("Singapore");
results.add("US");
results.add("UK");

spinner1 = (Spinner) findViewById(R.id.spinner1);
spinnerArrayAdapter1 = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_spinner_item, results);
spinnerArrayAdapter1.setDropDownViewResource(android.R.layout.simple_spinner_item);
spinner1.setAdapter(spinnerArrayAdapter1);
                spinner1.setOnItemSelectedListener(this);
}
        public void onItemSelected(AdapterView<?> parent, View view, int pos,long id) {
   Toast.makeText(parent.getContext(), 
       "OnItemSelectedListener : " + parent.getItemAtPosition(pos).toString(),
       Toast.LENGTH_SHORT).show();
}

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


}

}


main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/linear_setting"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/main_bg"
    android:orientation="vertical" >

    <Spinner
        android:id="@+id/spinner1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />


</LinearLayout>