Android Alert Dialog - how to hide the OK button after it being pressed

Question

I have been developing an Android app.

I would like to hide the OK button after the user presses it, as the dialog window will stay at the foreground for some seconds while a computation takes place.

This is the code:

    new AlertDialog.Builder(this)
    .setMessage("This may take a while")
    .setPositiveButton("OK", new android.content.DialogInterface.OnClickListener() {                
        @Override
        public void onClick(DialogInterface dialog, int which) {
                       // hide the OK button - how?
                       // a lot of computation
        }
    })
    .show(); 

How can I achieve that?

P.S.: I am not interesting to more advanced techniques to handle a computation (such as: progress dialogs, multi-threading).

Thanks.

Answer 1

For anyone else trying to disable the Positive button on an AlertDialog, a lot of these solutions don't seem to work now - you can't grab a reference to the button as soon as you call create on the AlertDialog.Builder, it'll just return null.

So one place it should be available is in onResume, so the way I got this to work was something like this:

var positiveButton: Button? = null

override fun onResume() {
    super.onResume()
    if (positiveButton == null) {
        positiveButton = (dialog as AlertDialog).getButton(AlertDialog.BUTTON_POSITIVE)
    }
}

and that way you should have a reference available whenever your fragment is running, so you can just call positiveButton.isEnabled = false whenever you need to disable it.

Just be careful with your state, a recreated fragment might have some checked boxes or whatever, but it won't have that positiveButton reference yet, and it'll re-run that code in onResume. So if you need to do any initialisation (like disabling the button until the user selects an option) make sure you call a function that checks the current state and decides whether the button should be enabled or not. Don't assume it's just starting up blank!

Answer 2

.setPositiveButton("OK", new android.content.DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
         ((AlertDialog)dialog).getButton(which).setVisibility(View.INVISIBLE);
         // the rest of your stuff
    }
})