I tried accessing my wallet through the android app and it works fine. Check yours again as it might be a temporary thing.

If you're still experiencing the same problem:

a).Check if you're using android 4.1+, if not then its not compatible
b).Check if you app is on the latest version 6.8.1, if not, Update it
c). Clear data and cache
or did you change your apps permission/s?

And your last resort is to obviously contact their support. Users above already provided some links. Make it concise and should be followed by proofs e.g. screenshots