在android中转换为json数组时android联系人的问题

Currently i am working with android contacts,i want to convert this in to json array for post this contacts to webserver,i am able to get all contacts,but issues is when i print the json array it shows only the last contact.i think the object value is not retained ,how can i solve this issue?i just post my code below.Currently i am working with android contacts,i