AlertDialog with List

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/button_alertDialogList"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="98dp"
        android:text="Dialog List" />

</RelativeLayout>

MainActivity.java

package in.blogspot.kantapp.alertdialogwithlist;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {

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

        Button showDialog = (Button) findViewById(R.id.button_alertDialogList);

        showDialog.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                final String[] names = getResources().getStringArray(
                        R.array.mobileplatforms);

                AlertDialog.Builder builder = new AlertDialog.Builder(
                        MainActivity.this);

                builder.setTitle(R.string.names);

                builder.setItems(R.array.mobileplatforms,
                        new DialogInterface.OnClickListener() {

                            @Override
                            public void onClick(DialogInterface arg0, int index) {
                                // TODO Auto-generated method stub
                                switch (index) {
                                    case 0:
                                        Toast.makeText(getApplicationContext(),
                                                names[index] + " Selected",
                                                Toast.LENGTH_LONG).show();
                                        break;

                                    case 1:
                                        Toast.makeText(getApplicationContext(),
                                                names[index] + " Selected",
                                                Toast.LENGTH_LONG).show();
                                        break;
                                    case 2:
                                        Toast.makeText(getApplicationContext(),
                                                names[index] + " Selected",
                                                Toast.LENGTH_LONG).show();
                                        break;
                                }

                            }
                        });

                AlertDialog alertList = builder.create();

                alertList.show();

            }
        });
    }

}

string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">AlertDialog with List</string>
    <string name="action_settings">Settings</string>
    <string name="hello_world">Hello world!</string>
    <string name="names">Mobile Platforms</string>
    <string-array name="mobileplatforms">
        <item >Android</item>
        <item >iPhone</item>
        <item >BlackBerry</item>
    </string-array>

</resources>