try looking for the wallet backup on google's server.. like go into gmail, then click onto account and look around at things that get backed up/saved from your phone..
I remember finding all my contacts this way, as well as other things that I was able to back up via my android
I just tried to do a full "Google takeout", but looking through the files that I get there is no wallet.dat or any file similar to this or afaict related to bitcoins.