Android Question app beginner

[Devendra Karanjit]

I designed an app It works fine in most of the android devices but in some models it does not show text on button

 

[klaus]

What are the text colors and button colors ?
They are probably the same on theses devices.

 

[James Chamblin]

What do the models have in common? Low resolution? Older OS? Once you can pin down the problem, then a solution would be easier. Might need to make Font a bit smaller, or slightly re-position the buttons, or change the minimum and target api in the manifest editor.