Converting string to ArrayList<String>

Question

I know it's a strange question but I need one thing: I receive a string as a result of a http operation. In reality this string contains an array of strings like this:

["Leon","Prova 2","TestData"]

Basically I want to convert this string into an ArrayList because I need it for an adapter. This is the java code:

public class Archivio{

    static ArrayList<String> titoli = new ArrayList<String>();
    static ArrayList<String> art = new ArrayList<String>();
    static String response, response2 = null;
    HttpClient httpclient;
     HttpPost httppost,httppost2;
     List<NameValuePair> nameValuePairs,namePairs;
    @SuppressLint({ "NewApi", "NewApi", "NewApi" })
    Archivio() {

        try {

            StrictMode.ThreadPolicy policy = new
                    StrictMode.ThreadPolicy.Builder()
                    .permitAll().build();
                    StrictMode.setThreadPolicy(policy);

                    httpclient=new DefaultHttpClient();
                     httppost= new HttpPost("http://tripleleon.altervista.org/artiview2.php"); 
                     nameValuePairs = new ArrayList<NameValuePair>();
                      httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                     //Esecuzione richiesta HTTP Post e ricezione risultato operazione
                     //response=httpclient.execute(httppost);
                     ResponseHandler<String> responseHandler = new BasicResponseHandler();
                     response = httpclient.execute(httppost, responseHandler);
                     System.out.println("Response : " + response); 
                     httppost2= new HttpPost("http://tripleleon.altervista.org/artiview3.php"); 
                     namePairs = new ArrayList<NameValuePair>();
                      httppost2.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                     ResponseHandler<String> responseHandler2 = new BasicResponseHandler();
                     response2 = httpclient.execute(httppost2, responseHandler2);
                     System.out.println("Response : " + response2); 

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    ArrayList<String> retTitle() {
        return response;
    }


    ArrayList<String> retArt() {
        return response2;   
    }
}

as I said into another comment: this is a class made for tests. I'm using threads into the real project — Leon
– Leon, Commented Apr 4, 2014 at 14:06

nKn · Accepted Answer · 2014-04-04 14:05:55Z

5

Try with the following code (being stringArray the String that contains your "array"):

ArrayList<String> myList = new ArrayList<String>(Arrays.asList(stringArray.substring(1, stringArray.length() - 1).replaceAll("\"", "").split(",")));

This will remove the first and last characters ([ and ] respectively) and split by the , character. Afterwards, convert it into an ArrayList using the Arrays.asList method.

edited Apr 4, 2014 at 14:05

answered Apr 4, 2014 at 14:00

nKn

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2 Comments

Leon Over a year ago

"Type mismatch: cannot convert from List<String> to ArrayList<String>"

nKn Over a year ago

Simply wrap it into a new ArrayList<String>(...) statement (updated my answer).

Raghunandan · Accepted Answer · 2014-04-04 14:09:05Z

1

You can loop through the JSONArray and add it to ArrayList.

ArrayList<String> list = new ArrayList<String>();
JSONArray jr = new JSONArray("string");
for(int i=0;i<jr.length();i++)
{
   String value =(String) jr.get(i);
   list.add(value); 
}

But you are not using Thread or Asynctask for getting the json from the server. Do not use StrictMode in production stage.

Also check your minsdk in manifest @SuppressLint({ "NewApi", "NewApi", "NewApi" }). You have suppressed lint warning

edited Apr 4, 2014 at 14:09

answered Apr 4, 2014 at 13:59

Raghunandan

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1 Comment

Leon Over a year ago

it's a temporary class made for various tests. Of course I'm using threads in the real project ;)

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