Google ad revenue other income, or business income?

Keshavaprasad B S (Engineer) (22 Points)

31 March 2017  
I am a salaried employee, do some speculative stock trading, for which I am filing ITR 4, and also earn some google ad revenue from some of my android apps. I also earn some income by selling features on my android apps. Should I show the google ad revenue and the income I get by selling features on my android apps under business income, or as part of other income? I am building these android apps only in my free time, and am not involved in it regularly. If I show it under other income, can I claim depreciation for the mobile phone I bought in other to build the android apps, under section 57?