How do I close an Android alertdialog

Question

I am developing a quiz and I need the user to answer all the questions before proceeding. When the user has not answered all the questions I display a simple alertdialog informing him or her. The problem is whatever I do I can't get the alertdialog to close. Why isn't dialog.cancel working?`This is the code:

AlertDialog.Builder ad = new AlertDialog.Builder(this);  
ad.setTitle("Unanswered Questions");  
ad.setMessage("You have not answered all the questions.");   
ad.setPositiveButton("OK", new DialogInterface.OnClickListener() {  
   public void onClick(DialogInterface dialog, int id) {  
     dialog.cancel(); 
}  
});  
ad.show(); 

question from:https://stackoverflow.com/questions/4336470/how-do-i-close-an-android-alertdialog

Answer 1

The AlertDialog.Builder itself does not contain a dismiss() or cancel() method.

It is a convenience class to help you create a Dialog, which DOES have access to those methods.

Here is an example:

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

AlertDialog alert = builder.create();

alert.show();

You can then call the alert.cancel() method on the alert (not the builder).