如何以编程方式确保用户已使用AlertDialog.Builder选择了一个选项？

Question

In my android application, I have created a dialog box showing the user multiple options from a list.

I have used this class to do so: http://developer.android.com/reference/android/app/AlertDialog.Builder.html

More specifically, I used setMultiChoiceItems

Now the options are displaying correctly and everything works well. However, I need to make sure that the user has actually selected one of these options and not immediately pressed the proceeding Button that I have set using setPositiveButton.

Is there a way I can programmatically make sure one or more of these options is picked? I will set up a quick if statement as well and even display a warning dialog if none of the options is picked.

Thank you and I apologize if this question has been asked before.

Answer 1

The easiest way to do it is to use the DialogInterface.OnMultiChoiceClickListener to keep track of the user's selections. Initialize an array before you create the dialog and then every time the user makes/clears a selection then add/remove it from the array. Once the user hits the positive button check if the array is empty: if it is, they made no selections.