I published one of my top iOS apps as an Android apps last year and was disappointed with the results. It made a few dollars a day and came nowhere close to its iOS counterpart (less than 30x). Last week though, I made a small change that boosted sales 10x. Braydon, a top app developer friend, recommended that I use Google Play's auto-translate feature to translate my app's metadata into several languages. It's actually as easy as selecting the languages and clicking a button. It's a feature that I completely skipped over, yet immediately boosted sales 5-10x per day.

A few lessons here:
1) There are thousands of contractors on Elance ready to out-bid each other for your Android app. I found a contractor that charges less than $100 per app. This means that I only need 50 sales EVER on my $2.10 apps to make a profit.
2) Take the time to learn all the features when you switch to a new platform. I've been missing out on $1000+ per month because of Google's auto-translate feature.
3) Reach out to other developers as much as possible. For my first 1.5 years in the App Store I was completely on my own. Luckily, now I'm part of a mastermind group with other top app developers.

Note: Although Android apps can be a good diversification, I highly recommend iOS over Android. 

Spencer Costanzo