fatal exception asyncTask #1 host may not be null

Question

i'm try to get json file from mvc 4 application using webapi but i get an error in asynctask doinbackground method

java.lang.illegalargumentexception host may not be null

when i track my code i found that it crash on jsonparser in getjson from url at the last line of this code

public JSONObject getJSONFromUrl(String Url) throws JSONException
    {

        try {
            Log.d("tony","6"+Url);
            DefaultHttpClient httpClient = new DefaultHttpClient(); // to connect to http
            Log.d("tony","7"+Url);
            HttpGet httpGet=new HttpGet(Url);
            Log.d("tony","8"+httpGet.getMethod());
            HttpResponse httpResponse = httpClient.execute(httpGet);

and this is my do in background code

 public JSONObject doInBackground(String... urls) {
  // get url pointing to entry point of API
  String address = urls[0].toString();
  if (method.equals(LOAD_REQUEST)) 
  {
    return getJSON(address);

  }
  else
   return makeHttpRequest(address, method, parameters);
 }

the get json method

public JSONObject getJSON(String url){
       JSONObject j = null;
    try {
         j=parser.getJSONFromUrl(url);
    } catch (JSONException e) {

        e.printStackTrace();
    }
    return j;
 }

u have added intermnet permission?

KOTIOS
– KOTIOS

2014-08-07 18:28:37 +00:00
Commented Aug 7, 2014 at 18:28 — KOTIOS
– KOTIOS, Commented Aug 7, 2014 at 18:28
yes i added internet permission

Antwan
– Antwan

2014-08-07 18:29:21 +00:00
Commented Aug 7, 2014 at 18:29 — Antwan
– Antwan, Commented Aug 7, 2014 at 18:29
localhost:2100/api/products

Antwan
– Antwan

2014-08-07 18:29:53 +00:00
Commented Aug 7, 2014 at 18:29 — Antwan
– Antwan, Commented Aug 7, 2014 at 18:29

mmlooloo · Accepted Answer · 2014-08-07 18:33:15Z

1

change

 localhost:2100/api/products

to

http://localhost:2100/api/products

answered Aug 7, 2014 at 18:33

mmlooloo

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Comments

Chefes · Accepted Answer · 2014-08-07 18:38:28Z

1

first correction :

localhost:2100/api/products

to

http://localhost:2100/api/products

Second, change

http://localhost:2100/api/products

to

http://ipaddress:2100/api/products

Because if you are using "localhost" you are pointing to the device host, and you need point the server.

answered Aug 7, 2014 at 18:38

Chefes

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Comments

Fadi · Accepted Answer · 2014-08-07 20:09:47Z

1

you need to add http:// to the url like that:

http://localhost:2100/api/products

answered Aug 7, 2014 at 20:09

Fadi

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1 Comment

mmlooloo Over a year ago

are you friend of Tony ?

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