CODEWITHSUNDEEP
androidjsonurl
bharath
bharath

Reputation: 953

Null pointer exception json parsing url android

I am trying to parse a json entry from the url. Below is the code segment.

TextView txtViewParsedValue;
private JSONObject jsonObject;
private static String url = "https://www.dropbox.com/s/rhk01nqlyj5gixl/jsonparsing.txt?dl=1"; 
String strParsedValue = null;  
TextView txtViewParsedValue;
private JSONObject jsonObject;
private static String url = "https://www.dropbox.com/s/rhk01nqlyj5gixl/jsonparsing.txt?dl=1"; 
String strParsedValue = null;           

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    txtViewParsedValue = (TextView) findViewById(R.id.textview1);

    try {
        parseJSON();

    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

public void parseJSON() throws JSONException
{       
    JSONParser jParser = new JSONParser();
    jsonObject = jParser.getJSONFromUrl(url);

    JSONObject object = jsonObject.getJSONObject("student");

    JSONArray subArray = object.getJS ONArray("student");

    for(int i=0; i<subArray.length(); i++)
    {
        strParsedValue+="\n"+subArray.getJSONObject(i).getString("id").toString();
    }

    txtViewParsedValue.setText(strParsedValue);
}

I want to extract all id's of student and print them in textview. Its giving null pointer exception. Searched several posts relatng to this and tried them, but didn work, any guidance would be of great help!

Upvotes: 0

Views: 650

Answers (2)

Rajitha Siriwardena
Rajitha Siriwardena

Reputation: 2759

Dont use JSONObject object = jsonObject.getJSONObject("student"); because according to your JSON student is an array.

Change it to 

JSONArray subArray = jsonObject.getJSONArray("student");

Upvotes: 0

ρяσѕρєя K
ρяσѕρєя K

Reputation: 132972

student is JsonArray instead of JsonObject but you are trying to get it as JsonObject. change your parsing code as :

JSONArray subArray =jsonObject.getJSONArray("student");//<<< get student JSONArray
for(int i=0; i<subArray.length(); i++)
  {
   strParsedValue+=
        "\n"+subArray.getJSONObject(i).getString("id").toString();
 }

Upvotes: 3

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