How to Print Message when Json Response has no fileds?

Question

I am using this tutorial http://www.androidhive.info/2012/01/android-json-parsing-tutorial/ for json parsing,and in my app response and everything works fine,but what if response has no filed,suppose as per this tutorial if it has reponse like {"contacts":""},it means no array so how to print toast if no fields there.

score 0 · Answer 1 · edited Nov 21 '14 at 13:44

0

if (response=null)
Toast.maketext(this,"No response",Toast.lenght_long).show();

edited Nov 21 '14 at 13:44

Zied R.

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answered Nov 21 '14 at 13:43

therealprashant

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check example and tell me where can i add this line – Nov 21 '14 at 13:46

score 0 · Answer 2 · edited Nov 21 '14 at 14:21

0

You can try to check if your response is null or with length 0

if (response=null || response.length == 0 )
Toast.makeText(this,"No contacts found.",Toast.LENGTH_LONG).show();

edited Nov 21 '14 at 14:21

Marcel Krivek

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answered Nov 21 '14 at 13:47

Benjamin RD

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score 0 · Answer 3 · answered Nov 21 '14 at 13:48

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// Getting JSON Array node
contacts = jsonObj.getJSONArray(TAG_CONTACTS);
if(contacts == null || contacts.length() == 0){
    // Do your thing..
}

answered Nov 21 '14 at 13:48

Carnal

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as per that tutorial where can i add this lines – Nov 21 '14 at 13:49
In your GetContacts class which is an AsyncTask. – Carnal Nov 21 '14 at 13:50
You will have to make your toast the UIThread, in this case onPostExecute – Carnal Nov 21 '14 at 14:00
I gave you a hint, you can figure the rest out! You could make doInBackground to return a list with contacts or a Boolean indicating if there are any contacts. And act on that onPostExecute – Carnal Nov 21 '14 at 14:08
what if i need to add textview there? – Nov 22 '14 at 09:39

score 0 · Answer 4 · answered Nov 21 '14 at 14:35

0

Try this as per example code

// Getting JSON Array node
contacts = jsonObj.getJSONArray(TAG_CONTACTS);
if(contacts == null || contacts.length() == 0){
   // show toast in doinbackground using runOnUiThread
   runOnUiThread(new Runnable() {

                    public void run() {

                      Toast.makeText(getApplicationContext(), "No response", Toast.LENGTH_SHORT).show();

                       }
                    });
}

answered Nov 21 '14 at 14:35

Furqan

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Display `Toast` in `doInBackground` refer this link [http://stackoverflow.com/questions/13790351/how-to-show-toast-in-asynctask-in-doinbackground](http://stackoverflow.com/questions/13790351/how-to-show-toast-in-asynctask-in-doinbackground) – Furqan Nov 22 '14 at 05:04

score 0 · Accepted Answer · edited Nov 22 '14 at 12:14

as per this example try this..

protected void onPostExecute(Void result) {
    super.onPostExecute(result);

    if(contacts == null || contacts.length() == 0){                
         Toast.makeText(getApplicationContext(), "No Data",Toast.LENGTH_SHORT).show();       
    }

    // Dismiss the progress dialog
    if (pDialog.isShowing())
         pDialog.dismiss();          
}

How to Print Message when Json Response has no fileds?

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