I am developing an iOS application on swift and I was wondering is it possible to convert the code to run on android devices or I have to develop a new application. I have experience only with writing application on swift and I do not know how to create an android application. If it is possible to convert it it will be great.
If you do not want to write different code for ios and android. Check if Hybrid app fits your requirements. Check out Apache Cordova (Adobe phonegap). You will be coding your application as a web app using HTML Css Js. Please be aware of its own pro's and con's of going with hybrid app.
If you are looking for truly native alternatives, Check out Xamarin which gives you native application's UI, Performance and access to low level API's. You need to code your app in C#
You cannot directly convert swift code to make it work on Android.