Passing JSON data from PHP script to Android

Question

On the PHP end, I'm getting a JSON Object that we're sending back to Android. The PHP code is straightforward and just echos the JSON object like I have seen in almost every tutorial.

This line creates an exception every other query. Am I doing something very wrong?

JSONObject json = jsonParser.makeHttpRequest(signInURL,
                    "POST", params1);

 04-15 21:40:44.787: E/AndroidRuntime(6325): java.lang.RuntimeException: An error occured while executing doInBackground()

I'm following these instructions:

How json will be used in our application.

When android application will execute, it will connect android device to PHP Script.
PHP Script will fetch data from the database. It will encode it into json format and send it to the device.
Now, android application will get these encoded data. It will parse the data and display it on android device.

In our Android application,

Use a HttpPost to get the data,
Convert response to string
Parse JSON data, and use it as you want

Edit: The problem was actually just PHP warnings that needed to be fixed. Thanks everyone!

Share you full error log.

Rashad
– Rashad

2014-04-16 02:06:33 +00:00
Commented Apr 16, 2014 at 2:06 — Rashad
– Rashad, Commented Apr 16, 2014 at 2:06

Harini Sekar · Accepted Answer · 2014-04-16 05:43:16Z

set internet permission in AndroidManifest.xml :

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

Http request from android to server

public String httpRequest(String url, String query, int methodtype){

    try {
        String reqUrl = url + query;

        switch (methodtype) {
            case 1:
                HttpGet httpGet = new HttpGet(reqUrl);
                httpResponse = httpClient.execute(httpGet);
                break;
            case 2:
                HttpPost httpPost = new HttpPost(reqUrl);
                httpResponse = httpClient.execute(httpPost);
                break;

        }



        HttpEntity httpEntity = httpResponse.getEntity();
        instrObj = httpEntity.getContent();

    } catch (UnsupportedEncodingException e) {
        //HandleException
    } catch (ClientProtocolException e) {
        //HandleException
    } catch (IOException e) {
        //HandleException
    }

    try {
        BufferedReader reader = new BufferedReader(new InputStreamReader(instrObj, "iso-8859-1"), 8);
        StringBuilder sb = new StringBuilder();
        String line = null;
        while ((line = reader.readLine()) != null) {
            sb.append(line + "\n");
        }
        instrObj.close();
        json = sb.toString();

    } catch (Exception e) {

    }       
    return json;
}

For posting the form data to the server HttpPost is used and to retreive the data from server HttpGet is used....

Rashad · Accepted Answer · 2014-04-16 02:06:15Z

1

It sometimes happens for not setting the internet permission.

To set internet permission do this:

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

Hope this helps.. :)

answered Apr 16, 2014 at 2:06

Rashad

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Comments

Sameer Khan · Accepted Answer · 2014-04-16 02:13:57Z

Try this piece of code

try {
    URL Url = new URL(" --------");
    HttpURLConnection connection = (HttpURLConnection) Url.openConnection();
    connection.connect();

    int responseCode = connection.getResponseCode();
    if (responseCode == HttpURLConnection.HTTP_OK) {
        InputStream inputStream = connection.getInputStream();
        Reader reader = new InputStreamReader(inputStream);

        int contentLength = connection.getContentLength();
        char[] charArray = new char[contentLength];
        reader.read(charArray);

        JSONObject jsonResponse = new JSONObject(charArray.toString());
    }
    else {
        Log.i("", "HTTP Response Code: " + responseCode);
    }
}
catch (Exception e) {
}

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