The raids don't work in Android. What happen is when you try to start a raid, the bar in the top shows that the raid will start and when it almost done loading, the bar disappear and the raid cancelled.
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Thank you for your report!
We're actually already tracking this issue at MCPE-42711, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
I hope that this will be fixed next update......I have faith in the whole developer team