naivepixel :: web design for a digital audience

Stop dismissing a Dialog, Android.

A dark hack I had to implement…

Have I ever told you I hate Java? I haven’t? Really? Ok. I do. And may that be the disclaimer for this post. I’ve been doing Android development for quite a while now and the jewel I came into this morning just had to be blogged.

When you want to show a single or multi-selection dialog, you use an AlertDialog.Builder right?. You call “setMultiChoiceItems”, then you call “setPositiveButton” and “setNegativeButton” (if it applies), and finally you just “show()” it. All good? Ok.

If you want to control what happens when the positive button is clicked, go back to your “setPositiveButton” call and just create a listener of type “DialogInterface.OnClickListener”, then override the “onClick” method. Still all good? Great.

Now let’s assume you want to validate some stuff in your dialog and if that stuff is not valid, then you have to prevent the dialog from dismissing, ok? Here’s where it gets messy. You can override the “onClick” of your positive button as much as you want, but the dialog will be dismissed no matter what you do in there…

Why is this happening? Well, I could try to give you a technical explanation but the truth is, I have no clue… I just resort to the classic: “Java sucks” and “Android sucks”...

So how can you solve this? Google and StackOverflow will tell you that you should create a custom dialog for this. Fuck it. A custom dialog? For that shit? Really?

NO. There’s another way. A dark one. One future developers will have a hard time understanding. But it works and here’s the trick.

Instead of using AlertDialog.Builder, use an AlertDialog object; still use the Builder to set the items and the two buttons, but just call the “create()” method in the end. You’ll still want to assign a listener to your positive button, but put nothing in it…

You must be wondering “wtf?”. Well, here’s the magic:

YES. A listener that overrides the “onShow” event, with another listener to the positive button that overrides its “onClick” method. And there, deep inside the overrides and the listeners, is the piece of code that you need… the “dismiss()”.

At this point, you can then put your validation and decide if the dialog goes away or stays. Something that is actually quite simple to do in Xcode/iOS, if you ask me.

comments [6] | tagged as: Mobile, Software

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