How do I parse JSON in Android

Question

How do I parse a JSON feed in Android

User · Answer

Android has all the tools you need to parse json built-in. Example follows, no need for GSON or anything like that.

Get your JSON:

Assume you have a json string

String result = "{\"someKey\":\"someValue\"}";

Create a JSONObject:

JSONObject jObject = new JSONObject(result);

If your json string is an array, e.g.:

String result = "[{\"someKey\":\"someValue\"}]"

then you should use JSONArray as demonstrated below and not JSONObject

To get a specific string

String aJsonString = jObject.getString("STRINGNAME");

To get a specific boolean

boolean aJsonBoolean = jObject.getBoolean("BOOLEANNAME");

To get a specific integer

int aJsonInteger = jObject.getInt("INTEGERNAME");

To get a specific long

long aJsonLong = jObject.getLong("LONGNAME");

To get a specific double

double aJsonDouble = jObject.getDouble("DOUBLENAME");

To get a specific JSONArray:

JSONArray jArray = jObject.getJSONArray("ARRAYNAME");

To get the items from the array

for (int i=0; i < jArray.length(); i++)
{
    try {
        JSONObject oneObject = jArray.getJSONObject(i);
        // Pulling items from the array
        String oneObjectsItem = oneObject.getString("STRINGNAMEinTHEarray");
        String oneObjectsItem2 = oneObject.getString("anotherSTRINGNAMEINtheARRAY");
    } catch (JSONException e) {
        // Oops
    }
}

User · Answer

I ve coded up a simple example for you and annotated the source  The example shows how to grab live json and parse into a JSONObject for detail extraction   try         Create a new HTTP Client     DefaultHttpClient defaultClient   new DefaultHttpClient           Setup the get request     HttpGet httpGetRequest   new HttpGet  http   example json            Execute the request in the client     HttpResponse httpResponse   defaultClient execute httpGetRequest          Grab the response     BufferedReader reader   new BufferedReader new InputStreamReader httpResponse getEntity   getContent     UTF-8         String json   reader readLine            Instantiate a JSON object from the request response     JSONObject jsonObject   new JSONObject json      catch Exception e          In your production code handle any errors and catch the individual exceptions     e printStackTrace        Once you have your JSONObject refer to the SDK for details on how to extract the data you require

User · Answer

Writing JSON Parser Class  public class JSONParser        static InputStream is   null      static JSONObject jObj   null      static String json               constructor     public JSONParser           public JSONObject getJSONFromUrl String url                Making HTTP request         try                  defaultHttpClient             DefaultHttpClient httpClient   new DefaultHttpClient                HttpPost httpPost   new HttpPost url                HttpResponse httpResponse   httpClient execute httpPost               HttpEntity httpEntity   httpResponse getEntity                is   httpEntity getContent               catch  UnsupportedEncodingException e                e printStackTrace              catch  ClientProtocolException e                e printStackTrace              catch  IOException e                e printStackTrace                       try               BufferedReader reader   new BufferedReader new InputStreamReader                      is   iso-8859-1    8               StringBuilder sb   new StringBuilder                String line   null              while   line   reader readLine       null                    sb append line     n                              is close                json   sb toString              catch  Exception e                Log e  Buffer Error    Error converting result     e toString                           try parse the string to a JSON object         try               jObj   new JSONObject json             catch  JSONException e                Log e  JSON Parser    Error parsing data     e toString                           return JSON String         return jObj            Parsing JSON Data Once you created parser class next thing is to know how to use that class  Below i am explaining how to parse the json  taken in this example  using the parser class   2 1  Store all these node names in variables  In the contacts json we have items like name  email  address  gender and phone numbers  So first thing is to store all these node names in variables  Open your main activity class and declare store all node names in static variables      url to make request private static String url    http   api 9android net contacts       JSON Node names private static final String TAG CONTACTS    contacts   private static final String TAG ID    id   private static final String TAG NAME    name   private static final String TAG EMAIL    email   private static final String TAG ADDRESS    address   private static final String TAG GENDER    gender   private static final String TAG PHONE    phone   private static final String TAG PHONE MOBILE    mobile   private static final String TAG PHONE HOME    home   private static final String TAG PHONE OFFICE    office       contacts JSONArray JSONArray contacts   null    2 2  Use parser class to get JSONObject and looping through each json item  Below i am creating an instance of JSONParser class and using for loop i am looping through each json item and finally storing each json data in variable      Creating JSON Parser instance JSONParser jParser   new JSONParser        getting JSON string from URL JSONObject json   jParser getJSONFromUrl url        try          Getting Array of Contacts     contacts   json getJSONArray TAG CONTACTS           looping through All Contacts     for int i   0  i  lt  contacts length    i             JSONObject c   contacts getJSONObject i               Storing each json item in variable         String id   c getString TAG ID           String name   c getString TAG NAME           String email   c getString TAG EMAIL           String address   c getString TAG ADDRESS           String gender   c getString TAG GENDER               Phone number is agin JSON Object         JSONObject phone   c getJSONObject TAG PHONE           String mobile   phone getString TAG PHONE MOBILE           String home   phone getString TAG PHONE HOME           String office   phone getString TAG PHONE OFFICE            catch  JSONException e        e printStackTrace

[android] How do I parse JSON in Android?

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