JSON Parse Error (No HTTP Error. Just String Conversion)

Question

So I Googled and found examples similar to what i need. I've tweaked and adjusted and solved most of my problems but have become confounded by this problem which i cannot seem to pass. Some Backround: So I'm building an App that query's a MySQL data base through PHP producing a JSON object. I can see "[{"question":"Why is the sky blue"}]" in my web browser on the SDK so I know I have access to the object. Permissions are set properly in my manifest as well. The problem comes when i try to parse the object to a string. I get "Error converting result java.lang.NullPointerException" from my log cat.

Now I've tried

//convert response to string
    try{
        BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
        String json = reader.readLine();
        JSONTokener tokener = new JSONTokener(json);
        JSONArray finalResult = new JSONArray(tokener);

          }catch(Exception e){
                Log.e("log_tag", "Error converting result "+e.toString());
          }

I've also tried

try{
                    BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8);
                    sb = new StringBuilder();
                    sb.append(reader.readLine() + "\n");
                    String line="0";
                    while ((line = reader.readLine()) != null) {
                        sb.append(line + "\n");
                    }
                    is.close();
                    result=sb.toString();

          }catch(Exception e){
                Log.e("log_tag", "Error converting result "+e.toString());
          }

I guess I'll post my http (even in its own thread best practices yay! - but then i use global variables (facepalm))

    new Thread() {
    public void run() {
          try{
               HttpClient httpclient = new DefaultHttpClient();

                          HttpPost httppost = new HttpPost("http://192.168.1.55/qgrap.php");

                          httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                          HttpResponse response = httpclient.execute(httppost);

               }catch(Exception e){
                   Log.e("log_tag", "Error in http connection"+e.toString());
              } 
    }
    }.start();

In the HTTP for the second code set you need to do some get content stuff either way I'd like to focus on the first code set. Here response is a global variable. which gets manipulated as it gets passed into BufferReader arguments. I'f I'm not mistaken at the point of String json = reader.readLine(); I should have access to the data as a string. Either way log says no go and i have no idea why. Also Can't I just create a string on the php side instead of using JSON?

BOUNTY: A Thousand Internets

Answer 1

I recommend GSON http://code.google.com/p/google-gson/

Answer 2

Alright so I'm scuttling this because I don't want to use gson i want my code to work. I have one error that i don't understand Error converting result java.lang.NullPointerException boom that's it.

     try{
    BufferedReader reader = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"));
    String json = reader.readLine();
    JSONTokener tokener = new JSONTokener(json);
    JSONArray finalResult = new JSONArray(tokener);

      }catch(Exception e){
            Log.e("log_tag", "Error converting result "+e.toString());
      }

Somewhere in this block of code is the problem. I'm not seeing it. Either way im going to html5

Answer 3

You should bundle up your input in some sort of loop rather than assuming it is all on the first line:

BufferedReader userInfoReader = new BufferedReader(new InputStreamReader(url.openStream()));
StringBuilder builder = new StringBuilder();
while ((line = userInfoReader.readLine()) != null) {
    builder.append(line).append("\n");
}
JSONTokener tokener = new JSONTokener(builder.toString());
JSONArray finalResult = new JSONArray(tokener);