解释在Android中收到的Json

Question

I am here working on my app where m receiving a Json in android. Here is my php script which sends Json.

<?php
require_once 'DB_connect.php';
class populatelist{
    private $con;
    private $conn;

    function __construct()
    {
        $this->con = new DB_connect();
        $this->conn = $this->con->connectWithRestaurant();
    }
    function selectallfields(){
        $query = "SELECT * FROM `restaurant_time` LIMIT 50";
        $result = $this->conn->query($query);
        if($result->num_rows >0)
        {
            while($record = $result->fetch_assoc())
            {
                $response['resname'] = $record['Restaurant_name'];
                $response['restadd'] = $record['Address'];
                $response['resttime'] = $record['Waiting_time'];
                $response['images'] = $record['Logo'];
                echo json_encode($response);
            }
            echo json_encode($response);
        }
    }
}


$function = new populatelist();
$function->selectallfields();

?>

And Here is my Android Code For Accepting this Json Request. This is responsible to send data to the custom adapter I have created.

 class Jsonfetch extends AsyncTask<String,Void,ListView>{

    @Override
    protected ListView doInBackground(String... params) {
        try {
            URL url = new URL("http://172.16.16.88/orderspot/populatelist.php");
            HttpURLConnection httpURLConnection = (HttpURLConnection)url.openConnection();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setAllowUserInteraction(false);
            InputStream inputStream = httpURLConnection.getInputStream();



            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            String temp;
            StringBuilder stringBuilder = new StringBuilder();
            while((temp = bufferedReader.readLine())!=null){
                stringBuilder.append(temp);
            }
            String JsonResponse = stringBuilder.toString();
            Log.i("JsonResposne",JsonResponse);
            try {
                JSONArray new_array =new JSONArray(JsonResponse);
                //int count;

                for(int i = 0, count = new_array.length();i<count;i++){
                    JSONObject jsonObject  = new_array.getJSONObject(i);
                    list.add(new ListModel(jsonObject.getString("resname"),jsonObject.getString("restadd"),jsonObject.getString("resttime"),jsonObject.getString("images")));
                }
                final customAdapter myadapter = new customAdapter(getApplicationContext(),list);
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            listView.setAdapter(myadapter);

                        }
                    });
            } catch (JSONException e) {
                e.printStackTrace();
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return listView;
    }
}

I exactly Dont know whats the problem with this code. But perhaps, I'm getting The Json in Invalid Format. And here is my Json Which I receive.

{"resname":"Sankalp","restadd":"Infocity","resttime":"South Indian","images":"25"}{"resname":"South Cafe","restadd":"Infocity","resttime":"South Indian","images":"20"}{"resname":"Uncle Sam","restadd":"Infocity","resttime":"Pizza","images":"15"}{"resname":"Dangee Dums","restadd":"Infocity","resttime":"Dessert","images":"10"}{"resname":"Fresh Roast","restadd":"Infocity","resttime":"Cafe","images":"5"}{"resname":"Cafe Natrani","restadd":"Infocity","resttime":"Cafe","images":"30"}{"resname":"Chocolate Room","restadd":"Infocity","resttime":"Chocolate","images":"0"}{"resname":"Subway","restadd":"Infocity","resttime":"Sandwich","images":"4"}{"resname":"Jai Bhawani","restadd":"Infocity","resttime":"Breakfast","images":"5"}{"resname":"Jai Bhawani","restadd":"Infocity","resttime":"Breakfast","images":"5"}

Answer 1

Your response from the server is in a JSONObject format. Not a JSONArray

Fix your php.

$response = array(); // JSONArray container

while($record = $result->fetch_assoc()) {
    // Build each JSONObject with your desired key names
    $namedRecord = array();
    $namedRecord['resname'] = $record['Restaurant_name'];
    $namedRecord['restadd'] = $record['Address'];
    $namedRecord['resttime'] = $record['Waiting_time'];
    $namedRecord['images'] = $record['Logo'];

    // Insert each object into the array
    array_push($response, $namedRecord);
}

// Output the array of objects
echo json_encode($response);

You are trying to create a JSONArray of JSONObjects which should be formatted like this.

[{key:value,key1:value1,...},{anotherObjectKey:anotherObjectValue}]

Answer 2

Print your JSON response in the Log and validate it on..

http://jsonlint.com/

Your response is not a valid JSON, it contains many JSONObjects which should be comma separates which they are not, and all of them should be contained inside an JSONArray. Please format it properly.

Check this link on how to build JSONArray in php,

http://alvinalexander.com/php/php-json_encode-convert-array-to-json-example

Your response should be as,

"rstaurants" :[
{
"resname": "Sankalp",
"restadd": "Infocity",
"resttime": "South Indian",
"images": "25"
},
{
"resname": "South Cafe",
"restadd": "Infocity",
"resttime": "South Indian",
"images": "20"
},
{
"resname": "Uncle Sam",
"restadd": "Infocity",
"resttime": "Pizza",
"images": "15"
},
{
"resname": "Dangee Dums",
"restadd": "Infocity",
"resttime": "Dessert",
"images": "10"
},
{
"resname": "Fresh Roast",
"restadd": "Infocity",
"resttime": "Cafe",
"images": "5"
}
]

Currently it is,

{
"resname": "Sankalp",
"restadd": "Infocity",
"resttime": "South Indian",
"images": "25"
}
{
"resname": "South Cafe",
"restadd": "Infocity",
"resttime": "South Indian",
"images": "20"
}
{
"resname": "Uncle Sam",
"restadd": "Infocity",
"resttime": "Pizza",
"images": "15"
}
{
"resname": "Dangee Dums",
"restadd": "Infocity",
"resttime": "Dessert",
"images": "10"
}
{
"resname": "Fresh Roast",
"restadd": "Infocity",
"resttime": "Cafe",
"images": "5"
}

Let me know if it works for you... And do mark it as answer so that it would be useful to others...

Answer 3

$response = array();

while($record = $result->fetch_assoc()) 
{
    $restaurant = array();
    $restaurant['resname'] = $record['Restaurant_name'];
    $restaurant['restadd'] = $record['Address'];
    $restaurant['resttime'] = $record['Waiting_time'];
    $restaurant['images'] = $record['Logo'];
    $response[] = $restaurant;
}
echo json_encode($response);