Change data source of android application from parse.com to json

[login to view URL] Change above mentioned application data source of android application from [login to view URL] to json self hosted server. this app is currently using data form [login to view URL] i want to change its data source from [login to view URL] to json and self hosted server. i will provide current source of the application, app source is in eclipse if you want to change to android studio its upto you. keep in mind app must start loading and showing data as soon as possible, file can be downloaded in app on the background so that user dont have to wait that long. other options can be txt and csv file on self hosted server.