You will need to use electrum on a pc or mac in order to generate a 24 word seed. Then you can restore from seed in android. So download electrum from electrum.org on a PC or mac and then go to view menu > check console. Switch to console tab and click on the warning to make it go away. Then paste in the following command there:
make_seed(nbits=256)
Press enter and it should spit out a 24 word seed.