如何在响应方面将arduino的JSON字符串发送到android设备，然后解码android应用程序上的字符串？

I am currently working on a project whereby i need to send a request from an android application to my Arduino mega which in turns response back with the states of LEDs connnected to the Arduino. I have already implemented the GET request. However i need to know how to read the response back and how to send the string from the Arduino to the Android app. I am currently working on a project whereby i n