There are many ways to which you can quickly make money through android apps. First of all, you have to build free and paid versions of your apps so that in the beginning people try your app freely and when they familiar with your app and then they buy an app. It is also crucial to provide unique content in your apps so that users could be casual with your app and get maximum results. You have to create more than one app so that people can install more apps and familiarise with your apps. For making money, you have promoted your free apps on different social media platforms. Portable business apps are handy for making money. There are many business apps for making money in the market which you can try, but this app is beneficial http://portablebusinessapps.beep.com/
for making more money, and these applications are more user-friendly.