Android Question B4A - Buttons not displaying on some older Android versions/devices

[David Zielinski]

Hi Everyone,

First time posting, haven't needed to post everything as B4A is pretty awesome and the support forum is an amazing resource... I couldn't find anything on this particular issue.

Just having a bit of an issue with older devices.... please see below... basically standard button controls aren't displaying on older android devices (buttons are placed on top of a standard imageview).

Current manifest:
<uses-sdk android:minSdkVersion="9" android:targetSdkVersion="28"/>

Buttons not showing - old Samsung S3 (Android Version 4.3, also happens on Android Version 4.4.2)

Buttons Showing on a Lenovo Tab 7

 

[DonManfred]

Can you post a small project which shows the issue?
Are the buttons ABOVE the Imageview in Designer? Or are you just using Elevation (which only apply for newer Devices)?

 

[Erel]

In Android 5+, with the material theme, buttons are elevated. If the ImageView is positioned above the buttons they will still appear in Android 5+ devices and they won't appear in Android 4 devices.

 

[LucaMs]

https://www.b4x.com/android/forum/threads/setelevation-using-reflection.58055/post-365521

 

[Erel]

setElevation using reflection

How can I set the Elevation property using reflection?

www.b4x.com

This is not relevant. I suggested a theory that explains the difference. If that theory is correct then the solution is simple, the buttons should be moved in front of the other views.

 

[LucaMs]

This is not relevant.

It is probable, perhaps certain, also because I have not read everything

That routine, however, is useful in many cases, to indicate it is not bad for your health.
( maybe it is also in the "Snippets" forum...) [not]

 

[David Zielinski]

In Android 5+, with the material theme, buttons are elevated. If the ImageView is positioned above the buttons they will still appear in Android 5+ devices and they won't appear in Android 4 devices.

Hi Erel and thanks for replying... first control placed in the designer was the imageview, and then buttons on top of the imageview. I did come across an "elevation" article but can't find it again. That might solve the problem???? I'll put together a sample project and post on here tomorrow.