I don’t have idea why it is happening but there 3 trivial attempts to make:
-
Use
android:textAllCaps="false"
in yourlayout-v21
-
Programmatically change the transformation method of the button.
mButton.setTransformationMethod(null);
-
Check your style for Allcaps
Note: public void setAllCaps(boolean allCaps)
, android:textAllCaps
are available from API version 14.