Answer 1

depends on your situation
like my situation

I like android development because I know what people search for android what apps not yet built for android , what apps can make people life easier but
I have an old pc core2duo pc having 2gb ram and 80 GB hard disk. so my pc is not good for android. development ide's(android studio) thats why I left android development but still android development is my love my dream

so my answer is you should go for what ever you love you can also continue both android and web development if you have good pc and brain also