UI Buttons Working on Android.

Question

Add Button script the OnClick() with a GameObject linked. The GameObject has a script with a function.

When I tap the button I simply trigger the function, which is working properly on Unity.

In Android device, it works only if you tap and leave the finger very fast. Otherwise if you tap and wait just a second, when you remove the finger the OnClick() is not called anymore.

Answer 1

Best Answer

Answer by Saad_Khan · Jun 04, 2015 at 08:40 AM

You should use Event Triggers if you are using the latest UI, instead of the OnClick() method

1) Add an event trigger component to the button

2) Add a new event ( on the event trigger component) from the options select "Pointerdown" or "PointerUp"(depending on whether you want to trigger it on touch or release, respectively)

3) Hook the corresponding function that you'd like to call, into this trigger

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sas_88 · Jun 04, 2015 at 09:50 AM 0

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Thanks man @Saad_Khan it saves the day...

cjsawyer · Aug 26, 2016 at 04:09 PM 2

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This post needs a few thousand more upvotes. The fact that buttons don't work correctly out of the box on Unity's most popular platform is a little ridiculous. This fixed the problem for me. I also found that increasing TouchInputModule's Input Actions Per second helped the problem a bit too.

_joe_ · Apr 23, 2017 at 01:44 PM 0

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Well it does work better but anybody though of the why? Is the UI Event sytem on mobile not scaling with the canvas? I feel that the slightest movement in a click is breaking the actual "click"

Answer 2

Answer by glitchers · Nov 25, 2016 at 11:27 AM

I found an alternate solution for this.

It's true you must tap quickly to trigger a click but I found the most common cause for a button click not firing was drag. For me the tap timer is sufficient (probably around 300ms is standard).

This problem was specifically an issue in more complex hierarchies especially scroll views. Fortunately the issue is incredibly easy to fix.

If you change the "Drag Threshold" (`pixelDragThreshold`) of your EventSystem to a higher value it will fix a lot of the Android button issues. The default value is 5 but I use 44 based on Apple's Human Interface guidelines but whatever works for you.

Also for buttons I found it important to disable raycastTarget on internal elements, say like any internal text or images.

I went along nearly implementing my own button solution for this but I found this forum post which shed light for me.

Hope that helps anyone else who comes to this!

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BowlerBitesLane · Jun 07, 2017 at 02:57 AM 1

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As far as I can tell this is the correct solution. This seems to fix the issue application-wide by changing a single value. Thanks!

Maxim_AO · Oct 30, 2017 at 08:38 AM 1

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GREAT THANKS!!!!

DLively · Nov 18, 2017 at 04:59 AM 1

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This should be green.

jidekrm · Jan 08, 2018 at 12:10 PM 1

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Works for me..and easier too!

seansteezy · Jan 29, 2018 at 09:40 PM 0

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This is definitely what I've been looking for, for like 2 years... thanks @glitchers! When combined with the removing raytracing on text and interal stuff, the button will work very nicely on mobile.

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UI Buttons Working on Android.

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