Cannot install on Android 5.1
Android 5.1 has started rolling out on many devices. Current version of Orbot on Google Play store doesn't support Android 5.1 yet.
I don't think there are many changes in 5.1 from 5.0, so only change required might be to just bump the maxSdkVersion to 22.
Keep up the good work & Thanks
Trac:
Username: abdulmoeed