Getting a JSONException: end of input at character 0

Question

I have an API in php, that sends data in JSON format. I made the following code, that works fine when I am on wifi. But when I want to download the data from the API when I am on 3g, I receive the following exception: JSONException: End of input at character 0 of

I have no idea why it does work on wifi, but it doesn't on mobile internet. My code:

        JSONObject json = getJSONfromURL("http://api.myurl.com/users.json");

        JSONArray objects = json.getJSONArray("objects");
        db.setLockingEnabled(false);
        db.beginTransaction();

        for (int i = 0; i < objects.length(); i++) {
            JSONObject e = objects.getJSONObject(i);

            if(e.getString("UID") != "-1"){
                ContentValues values = new ContentValues();
                //DO DATABASE INSERT. REMOVED THIS CODE FOR READABILITY
                alldata_mProgressDialog.incrementProgressBy(1);
            }
        }

Anyone that can help me out?

where is the API located? Is it available while not connected to the internal network? — nahwarang, Jan 05 '12 at 09:49
First of all, check whether you are getting exact response. Print your `json` value on console. — Paresh Mayani, Jan 05 '12 at 09:51
@PareshMayani agree, I think JSON response may be missing something. — Lalit Poptani, Jan 05 '12 at 10:01
@ mkfinest: The API is is available online, it works on every wifi network (at home, too). @PareshMayani: if I wouldn't get an exact response, it wouldn't work in wifi either? — harmjanr, Jan 05 '12 at 10:02
@harmjanr be sure to always null check your response. The mind set should be im lucky if I got a response, with that approach you at least avoid some potential pitfalls. — nahwarang, Jan 05 '12 at 10:09

score 51 · Accepted Answer · answered Jan 05 '12 at 09:57

51

You are probably getting a blank response. Its not null but the response is empty. So you are getting this error and not a Nullpointer exception

answered Jan 05 '12 at 09:57

amiekuser

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The response is null indeed. But why? Because the data sent from server is fine, it looks like my mobile internet connection is cutting the response or something.. Because, as mentioned before, it works fine on wifi. – harmjanr Jan 05 '12 at 11:22
1

check for some proxy issues. Is the url exposed on the internet? – amiekuser Mar 28 '12 at 11:52
How to block the error? Is there a way to detect it? Thank you – natsumiyu Oct 21 '19 at 23:26
internet issue show it's getting this error, double check your internet connection – Kumararaja Jun 27 '21 at 17:01
The response is Not Empty, but the problem arise. Why ? – Noor Hossain Aug 08 '22 at 14:29

score 5 · Answer 2 · edited Sep 01 '18 at 07:36

5

Check if you are asking for permissions to use the Internet.

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

in the Android Manifest

Check out others at Permissions overview @ https://developer.android.com.

edited Sep 01 '18 at 07:36

Roy Scheffers

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answered Sep 01 '18 at 03:46

David Rivera

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score 4 · Answer 3 · edited May 23 '17 at 11:54

4

May be you are getting default response with default values. This kind of error comes up when you are not sending your requests properly or sending with wrong parameters. Check This

edited May 23 '17 at 11:54

Community

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answered Jan 05 '12 at 10:06

san

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score 2 · Answer 4 · answered Nov 05 '16 at 12:06

2

Sometimes this error is caused as json encode function requires all incoming data to be UTF-8 encoded.

Try adding mysqli_set_charset($con, 'utf8'); into your php.

answered Nov 05 '16 at 12:06

truespan

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score 0 · Answer 5 · answered Apr 11 '18 at 09:09

0

This kind of error comes up when response is null.Print Json respone in logcat

Log.e ( "response", "" + response ), or you can check response on postman also.

answered Apr 11 '18 at 09:09

Vindhya Sharma

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score 0 · Answer 6 · answered Mar 24 '19 at 01:49

I got this error while debugging an android app on Android Studio via USB. Connection attempts failed with one tablet but not with my regular test tablet. It turned out that the failure was due to the fact that I hadn't enabled WIFI settings on the failing machine. So I enabled WIFI on it and it connected to server OK.

Getting a JSONException: end of input at character 0

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