Creating Dialog Box With Multiple Buttons

alert.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" >
  <Button
    android:id="@+id/alertBtn"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1"
  android:text="Alert 1"/>
  <Button
    android:id="@+id/alert2Btn"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1"
  android:text="Alert 2"/>
  <Button
    android:id="@+id/alert3Btn"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_weight="1"
    android:text="Alert 3"/>
</LinearLayout>

-----------------
Main.java

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

public class Main extends Activity implements View.OnClickListener {
    private AlertDialog alertDialog;
    private Button alertBtn;
    private Button alert2Btn;
    private Button alert3Btn;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.main);

        this.alertBtn = (Button)this.findViewById(R.id.alertBtn);
        this.alertBtn.setOnClickListener(this);
        this.alert2Btn = (Button)this.findViewById(R.id.alert2Btn);
        this.alert2Btn.setOnClickListener(this);
        this.alert3Btn = (Button)this.findViewById(R.id.alert3Btn);
        this.alert3Btn.setOnClickListener(this);
    }

    public void onClick(View view) {
        // TODO Auto-generated method stub
        if(view == this.alertBtn){
            alertDialog = new AlertDialog.Builder(this).create();
            alertDialog.setTitle("Alert 1");
            alertDialog.setMessage("This is an alert");
            alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
                 public void onClick(DialogInterface dialog, int which) {
                         return;
                 }
             });
        }else if(view  == this.alert2Btn){
            alertDialog = new AlertDialog.Builder(this).create();
            alertDialog.setTitle("Alert 2");
            alertDialog.setMessage("This is another alert");
            alertDialog.setIcon(R.drawable.search);
            alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
                 public void onClick(DialogInterface dialog, int which) {
                         return;
                 }
             });
            alertDialog.setButton2("Cancel", new DialogInterface.OnClickListener() {
                 public void onClick(DialogInterface dialog, int which) {
                         return;
                 }
             });
        }else if(view  == this.alert3Btn){
            alertDialog = new AlertDialog.Builder(this).create();
            alertDialog.setTitle("Alert 3");
            alertDialog.setMessage("This is the third alert");
            alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
                 public void onClick(DialogInterface dialog, int which) {
                         return;
                 }
             });
            alertDialog.setButton2("Cancel", new DialogInterface.OnClickListener() {
                 public void onClick(DialogInterface dialog, int which) {
                         return;
                 }
             });
            alertDialog.setButton3("Middle", new DialogInterface.OnClickListener() {
                 public void onClick(DialogInterface dialog, int which) {
                         return;
                 }
             });
        }
        alertDialog.show();
    }

}