Black boxes instead of text in UI in Android app -


i have android app in play store. in last couple of days i've started getting bug reports "black blocks in settings screen". unfortunantely haven't been able reproduce bug on devices, know comes user reports. i've got following screenshots helpful user:

http://madscientist.pl/temp/bug0.png

http://madscientist.pl/temp/bug1.png

there's supposed white text on tab headers, on buttons , next radio buttons , seek bars. there should white horizontal lines separating options.

the sizes of black boxes visible (the rest on black background) correspond sizes of letters supposed there. text on 2 columns of buttons reads "save" , "load".

my app can opened in 2 modes: live wallpaper , "regular app". problem apparently exists in both versions.

almost bug reports describe characteristic: the settings screen works correctly , doesn't. e.g., opening settings activity of live wallpaper second time fixes problem.

another person wrote works correctly on first application run only. after that, has clear app data , again fails on second run. seems bug manifests rather unpredictably.

i admit not being dev , text put directly in layout files instead of in strings.xml. never issue before, in case i'm in process of establishing if putting strings in strings.xml helps 1 of users.

the problem seems independent of device. i've got reports samsung, motorola, lg , nexus users.

from i've established far, @ least 1 of users problem happens on both current , previous version of app. previous version in store since january 2015. current version month old. i've been getting bug reports on week doesn't seem (directly) caused change made app.

this led me believe new android version has been rolling out (at least i've got 5.1 week ago) reason. i've got bug reports user runs app on 5.0.2 , 4.4.4.

the app moderately popular , has stable amount of downloads, fact in last week i've got dozen reports of bug, , before i've never heard of it, leds me believe indeed started happening on week ago. so apart bug itself, it's beyond understanding made appear now, if neither application update nor system update seem related.

i provide more data, question terribly long. let me know else think helpful.


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