Mr. Bipin S. Rupadiya

package com.bipin.rupadiya.alertdialogdemo;

import java.util.ArrayList;

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

public class MainActivity extends Activity {

final CharSequence myList[] = { "Tea", "Coffee", "Milk" };

ArrayList<Integer> selList=new ArrayList();
boolean bl[] = new boolean[myList.length];
RelativeLayout rl;
String msg ="";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

rl = (RelativeLayout) findViewById(R.id.myRL);
final Button btn = (Button) findViewById(R.id.btnDialog);

final AlertDialog.Builder ad = new AlertDialog.Builder(this);
ad.setTitle("What do you Like ?");
ad.setMultiChoiceItems(myList,bl, new OnMultiChoiceClickListener() {

@Override
public void onClick(DialogInterface arg0, int arg1, boolean arg2) {
// TODO Auto-generated method stub

if(arg2)
{
// If user select a item then add it in selected items
selList.add(arg1);
}
else if (selList.contains(arg1))
{
                    // if the item is already selected then remove it
selList.remove(Integer.valueOf(arg1));
                }
}
});
ad.setPositiveButton("OK", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
msg="";
for (int i = 0; i < selList.size(); i++) {

msg=msg+"\n"+(i+1)+" : "+myList[selList.get(i)];
}
Toast.makeText(getApplicationContext(),
"Total "+ selList.size() +" Items Selected.\n"+ msg , Toast.LENGTH_LONG)
.show();


}
});
ad.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(),
"You Have Cancel the Dialog box", Toast.LENGTH_LONG)
.show();
}
});

btn.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
msg="";
ad.show();
}
});

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}

}

<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"
    tools:context=".MainActivity"
    android:text="@+id/myRL" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="@string/hello_world" />

    <Button
        android:id="@+id/btnDialog"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="172dp"
        android:text="Show Dialog" />

</RelativeLayout>