creating a multi select dialog box in android

1. Create a java Activity class where you want your dialog to appear. 
2. Create a field     private ArrayList mSelectedItems; for storing your array list.
3. Call launchAddItems() when you need to create the dialog.
    
4. Add the following function to create the dialog protected void
5.  launchAddItems() {
             mSelectedItems = new ArrayList();
             final String items[] = {"Android","Iphone","Nokia"};
   
             AlertDialog.Builder ab=new AlertDialog.Builder(this);
             ab.setTitle("Dialog Title")
             .setMultiChoiceItems(items, null,  new DialogInterface.OnMultiChoiceClickListener(){
   
               @Override
               public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                   if (isChecked){
                         mSelectedItems.add(which);
                   }
                   else if(mSelectedItems.contains(which)){
                       mSelectedItems.remove(Integer.valueOf(which));
                   }
               }
                
             }).setPositiveButton("OK", new DialogInterface.OnClickListener() {
                 @Override
                 public void onClick(DialogInterface dialog, int id) {
                     // User clicked OK, so save the mSelectedItems results somewhere
                     // or return them to the component that opened the dialog
                 }
             }).setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
                 @Override
                 public void onClick(DialogInterface dialog, int id) {
                 }
             });
   
             ab.create();;
            
          
             ab.show();       
       }