Temperature value from JSON - update TextView Android

Hi guys,

I have an Android project to get the temperature value in the JSON data, like this

“cmd”: “VarReturn”,
“name”: “tempc”,
“result”: 31.25,
“coreInfo”: {
“last_app”: “”,
“connected”: true,
“deviceID”: “123456789”,
“product_id”: 6

So basically I can get the value in “result” - 31.25 and show in TextView.
The thing I wanna do is update this number in TextView every 1 second.
I tried to use AsyncTask but it can show the value in TextView only once time !

How can I update this value automatically in Android ?