parse json data from url by android app

Question

I'm trying to parse json from a url. I successed to parse from one url, so I copied the json file and uploaded to my domain(diffrent url) but now I can't get any data from the json. I havn't chaned the code in the android app except of the url. Please Help.

    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
    .detectAll()
    .penaltyLog()
    .build();
StrictMode.setThreadPolicy(policy);

TextView tv=(TextView)findViewById(R.id.textView1);

    TextView wid = (TextView) findViewById(R.id.id);
    TextView name = (TextView) findViewById(R.id.title);
    TextView url = (TextView) findViewById(R.id.description);


    JSONObject json = null;
    String str = "";
    HttpResponse response;
    HttpClient myClient = new DefaultHttpClient();
    HttpPost myConnection = new HttpPost("My Url~");

    try {
        response = myClient.execute(myConnection);
        str = EntityUtils.toString(response.getEntity(), "UTF-8");

    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    if(1>0)
        tv.setText(str);
    try{
        JSONArray jArray = new JSONArray(str);
        json = jArray.getJSONObject(0);


        wid.setText(json.getString("id"));
        name.setText(json.getString("title"));
        url.setText(json.getString("description"));


    } catch ( JSONException e) {
        e.printStackTrace();                
    }

when I print str I see all the text from the JSON file, but when I try to use getJSONObject I don't get any of the data from the JSON file.

It's impossible to answer your question without seeing your code and the JSON data you're trying to parse. — Egor
– Egor, Commented Apr 8, 2015 at 22:06

PetrM · Accepted Answer · 2016-03-05 09:57:34Z

1

Try this approach:

Put Your JSON here (or use similar JSON2POJO mapping) to generate Object from your JSON
Create new Java class from output of step 1 (MyClass.java)
Once Your JSON is fetched to your "str" variable, use e.g GSON to deserialize it:

Gson gson = new Gson();

MyClass obj = gson.fromJson(str, MyClass.class);
Then you can use:

obj.getWhatEverYouWant();

to access your data. It's much better, than parse JSON manually.

Also you should consider using RETROFIT or OKHTTP to sending your http requests.

answered Mar 5, 2016 at 9:57

PetrM

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