Think… Do you really need an Android app?
People don’t want to install the app, expect a few to make you happy and others to stay updated with your progress. 90% of the installers will still prefer to visit your website.
Apps and blogs are different. Until your blog is quite popular, I would advise you to stay away from this trend. It would cost you another $25 to publish it.
Oh, and for the app creation, you will need to hire a developer for a custom app. Appgeyser and other similar websites just use the mobile version.