How Parse JSON string Android

How Parse JSON string Android

Hi I have my json file like this:
{
"shops": [
{
"id": "11",
"name": "Next",
"categories": [
"4",
"33",
"34",
"16"
],
"bg_image": "/uploads/static/shop/460px/2012/12/5385-127-sale.jpg"
},
{
"id": "12",
"name": "MS",
"categories": [
"4",
"33",
"42",
"16"
],
"bg_image": "/uploads/static/shop/460px/2012/12/5385-127-sale.jpg"
},
.....
I want to filter the shops according to the categories id. But I couldn't
find any solution for this. Someone please help me to solve this on
android. Please don't ignore this question. The solution is very important
for me. Thanks in advanced.