Yeah, you can possibly mine bitcoin using your android phone but getting a legit mine app is where the problem is because there are thousands of applications out there but only few that is legit and they are very hard to get so to avoid choosing the wrong mining app in the process of trying to find the right one.
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Don’t give OP false hope, although you gave OP a choice of investing at the end which is still good and I think that was what you should have emphasized on in the first place, the possibility of him finding a software that actually does that is 0.1% unless he fall a victim of
cryptojacking.. So if OP can get the dedicated hardwares to pursue his Bitcoin Mining goal then he better not try searching for other alternatives to mine Bitcoin as they are all likely to be scam..