I've found a corner case for crashing the Android app that appears on locked questions. I produced this in app v1.0.31, on a HTC One running Android 4.4.2.
A preamble: the usual behaviour
First: visit a locked question, such as this one. Tap a comment and select 'Vote up'. This won't crash your app, but you'll notice that: (a) a loading spinner appears, and then (b) the dialog will close and you'll get an error message telling you that you can't actually vote for that comment.
Now, here's how to crash the app
- Visit a locked question
- Vote the comment up
- When the loading spinner appears, tap anywhere outside the dialog to dismiss it. This could happen if, say, you want to wipe some dust off the screen or you just happen to bump it whilst waiting for the loading to finish.
- Wait a second or two - probably for as long as it'd take for that error message to appear - and the app will suddenly crash.