For some time now I have been thinking on how to develop a mining app,  bbut don't know how it works,  am an android developer. Please I need help on the concept behind it and how to implement it on android

I have been thinking of mining with my phone for some times now,  I have gone through various online resources on how to mine with smartphone but the result were not satisfactory considering how hard it is to mine this days.  Please which coin can I easily mine with my phone.