We did the testing based on android target to 8.1 and minimum to 4.3, it works fine, please refer below video.
Could you please confirm if you clean you packages when building the sample? I think this issue maybe caused you didn't updated the latest package.
You can double check that in the bin folder before running the sample on Android Device.
If there is still any issue, please feel free to let know that, we will help you to figure out that.