You can try using BiglyBT on android following these instructions: https://github.com/BiglySoftware/BiglyBT/wiki/I2P#user-content-biglybt-i2p-and-android
Otherwise, I'd suggest using a desktop to run i2psnark, BiglyBT, or qBittorrent and use i2pd along with those clients.
https://geti2p.net/en/download for the java version, which comes with extra apps. Otherwise, you can go to https://i2pd.website/ for the C++ version which is much lighter and you can just point your browser/torrent clients at the i2p router and you are good to go.