I have seen bounty hunter doing well, I have also seen people who do not participate in bounty and are making it well with trading alone, but I have never seen anyone around me being involved in mining, I learnt mining is more risky and cannot just be done alone, and if you even attempt it probably with your android, you may end up wasting your time and not even making it as the traders and hunters. It tend to take a massive effort to be successful in mining, you need good electricity,good mining wallet, computer with good capacity, and some other gadgets. Considering all this, which of all the participation do you see as least demanding and easiest?
One of the easiest way to earn Bitcoin is by joining campaigns that will give a weekly payout BUT that would seem hard since it might take a lot of time weekly. Joining Alternate Cryptocurrencies campaign would be better since you can always expect a sudden surge in value of Alternate Cryptos. Trading can be easy but that requires experience so I guess the easiest way is by faucets and mining.