At present there is no provision to run a blockchain node using mobile.
You can however use a mobile client to access the blockchain for transactions. But that connection is done by a backend service (example Coinbase).
They are connected to many nodes, but as an android user, you can just send a request to there API, their backend in turn handles all web3.js transactions and returns a response. So, the provision you have is to use web3.js to get information and send requests.