There are several ways to build applications for android operating system that generates huge profits. The top models based on which the applications can be developed for android operating system are In- App ads, pay per download applications, Freemium, notification and paid applications.
On developing paid applications, quote your price and it is estimated that more than 80% paid applications are downloaded 100 times. The pay per download applications aids the user to gain additional search access points.
Freemium applications that are developed provides free game play but for additional services and to access extra gaming features, the user has to pay money. This generates a huge revenue for the developers. The App-ads type of applications include the advertisement of various brands inside the application and there are plenty of ad networks over internet. By developing notifications large amount of revenue can be generated by placing high cost for ad impression.