What if JSON starts with an array

[
{
"id": "1",
"userName": "Admin",
"fullName": "Admin",
"emailID": "kumarniranjan.unique@gmail.com",
"empNo": "p001",
"mobileNo": null,
"grade": "W0",
"gradeId": 1,
"allGrades": null,
"empType": 1,
"empTypeName": "Regular",
"allEmpTypes": null,
"deptId": 0,
"department": "Human Resource",
"allDepartments": null,
"allProjects": null,
"projectsAssigned": null,
"post": null,
"extension": null,
"seatNo": null,
"dob": null,
"doj": null,
"gender": 0,
"bloodGroup": 0,
"reportingTo": null,
"postedAt": null,
"photo": null,
"imageData": null,
"status": 0
},
{
"id": "2",
"userName": "User",
"fullName": "User",
"emailID": "User@gmail.com",
"empNo": "p002",
"mobileNo": "8804354448",
"grade": "W0",
"gradeId": 1,
"allGrades": null,
"empType": 1,
"empTypeName": "Regular",
"allEmpTypes": null,
"deptId": 0,
"department": "Technical",
"allDepartments": null,
"allProjects": null,
"projectsAssigned": null,
"post": null,
"extension": "980",
"seatNo": null,
"dob": null,
"doj": null,
"gender": 0,
"bloodGroup": 0,
"reportingTo": null,
"postedAt": null,
"photo": null,
"imageData": null,
"status": 0
}]
Thank you for the code.
This is my json. I want to search by username or fullname. Can anyone please help me what to write in onsuccess portion in mainactivity (according to the given code) with such type of json.