not easy at all.that is an arm device, and there have not been any progress on the android side to think of a proper ARM port of the emu.also if a port of an emulator is planned for a specific arch, if it was not included in the original plan and started concurrently with the other ports, it will be difficult to port it later. the last gen console to have an android emu was purei, the ps2 emu for X86 and Arm, and before that ppsspp, the psp emu following the same aim.they were planned to be on android from the beginning, so they are quite successful.dolphin is also on android, but that started 2 years ago.dolphin already existed for over 8 years, and the android port start when most code has been polished well that it became easy to port. there have not been any other emulator that was not planned to work on x86 and Arm, but had an android port when it was young that was comparable to the pc port.they all started with android on mind or waited till there code became good enough that they did not need to rewrite a lot of things for the port.
by the way, this is just my opinion.