如何获取JSON数据以便在我的android原生应用中解析和使用

My understanding is that as an android developer in order to develop native android apps for existing web applications built using Spring MVC or PHP or Angular JS, I need to access the data in JSON format and use in my android app as per my needs. For this I don't have to know anything about the web frameworks which were used to build the websites.My understanding is that as an android develope