ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[] android

Question

In my application I need to convert my arraylist to a string of an array. However, I am getting an error:

ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[] android

At the line with listofurls I am getting the error: listofurls = (String[])image_urls.toArray();

This is the full code:

public class Test2 extends AsyncTask<Void, Void, Void> 
{
  String[] listofurls ;
  private static final String url = "http://www.tts.com/album_pro/array_to_encode";
  JSONParser jParser = new JSONParser();
  ArrayList<String> image_urls = new ArrayList<String>();

  protected void onPreExecute() {
    //Log.e(LOG_CLASS, "in side assyntask");
  }

  protected Void doInBackground(Void... voids) {
    Log.v("Async","Async");
    JSONObject json = jParser.getJSONFromUrl(url);

    try {
      JSONObject seo = json.getJSONObject("SEO");
      JSONArray folio = seo.getJSONArray("Folio");

      // JSONArray image_urls1 = new JSONArray();
      //String s1=seo.getString("Folio");

      for(int i=0;i<folio.length();++i) {
        String m = folio.getString(i);
        Log.v("M"+i,m);
        image_urls.add(m);
        Log("test-url"+image_urls);
      }
    } catch(Exception e) {
      e.printStackTrace();
    }

    listofurls = (String[])image_urls.toArray();  //ERROR OCCURS HERE

    return null;
  }

  private void Log(String string) {
    Log.v("Test",string);
  }

  protected void onProgressUpdate(Integer... progress) { }

  protected void onPostExecute(Void result) {
    mAdapter = new ImagePagerAdapter(getSupportFragmentManager(),listofurls.length );
    mAdapter.setImageurls(listofurls);
    mPager.setAdapter(mAdapter);
  }

@MiserableVariable Better wording, yes ..

user166390
– user166390

2013-03-07 06:09:27 +00:00
Commented Mar 7, 2013 at 6:09 — user166390
– user166390, Commented Mar 7, 2013 at 6:09
actually opposite meaning, but you get the point :)

Miserable Variable
– Miserable Variable

2013-03-07 06:21:16 +00:00
Commented Mar 7, 2013 at 6:21 — Miserable Variable
– Miserable Variable, Commented Mar 7, 2013 at 6:21

Evgeniy Dorofeev · Accepted Answer · 2013-03-07 06:03:55Z

125

try

listofurls = image_urls.toArray(new String[image_urls.size()]);

Note: I suggest to rename listofurls to arrayOfURLs

answered Mar 7, 2013 at 6:03

Evgeniy Dorofeev

137k31 gold badges209 silver badges288 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Shweta Over a year ago

still getting the error.it says, Caused by: java.lang.ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[]

Shweta Over a year ago

you mean to say : String[] listofurls ; listofurls = image_urls.toArray(new String[image_urls.size()]); , instead of "listofurls" i should use "arrayOFURLs"?? but how does it make a difference

Evgeniy Dorofeev Over a year ago

i suggest to try and localize the problem, try this: List<String> image_urls = new ArrayList<String>(); String[] listofurls = image_urls.toArray(new String[image_urls.size()]);

Kevin Coppock Over a year ago

@Shweta Naming conventions. If you're calling your array a list, it's confusing.

Kevin Coppock · Accepted Answer · 2013-03-07 06:09:01Z

30

You should use toArray as mentioned above, but not in that way.

Either initialize the array first and fill it:

String[] urlArray = new String[image_urls.size()];
image_urls.toArray(urlArray);

After which, urlArray will contain all the Strings from image_urls, or pass in a zero-length String array:

listofurls = (String[]) image_urls.toArray(new String[0]);

See the documentation for toArray().

answered Mar 7, 2013 at 6:09

Kevin Coppock

135k45 gold badges270 silver badges279 bronze badges

2 Comments

mythicalcoder Over a year ago

Other solutions didn't work for me. Passing 0 length array worked.

Sergey Stasishin Over a year ago

This is right solution, Just no need for casting to (String[])

Deepzz · Accepted Answer · 2013-03-07 06:21:26Z

3

You just need to get the contents of arraylist in an array, right??

Can't u do like this?

       for(int i=0;i<folio.length();++i)
        {
            String m = folio.getString(i);
            Log.v("M"+i,m);
            image_urls.add(m);
            Log("test-url"+image_urls);


            listofurls[i] = m ;
        }

answered Mar 7, 2013 at 6:21

Deepzz

4,5711 gold badge30 silver badges53 bronze badges

Comments

Samarth S · Accepted Answer · 2016-07-25 11:35:26Z

3

listofurls = image_urls.toArray(new String[0]);

that should do the trick for all cases, even if you don't know the size of the resulting array.

answered Jul 25, 2016 at 11:35

Samarth S

3354 silver badges6 bronze badges

Comments

Community · Accepted Answer · 2017-05-23 12:10:33Z

2

Try this:

ArrayList<String> stock_list = new ArrayList<String>();
stock_list.add("stock1");
stock_list.add("stock2");
String[] stockArr = new String[stock_list.size()];
stockArr = stock_list.toArray(stockArr);
for(String s : stockArr)
    System.out.println(s);

Taken directly from here: link

edited May 23, 2017 at 12:10

CommunityBot

11 silver badge

answered Mar 7, 2013 at 6:08

crazylpfan

1,0987 silver badges9 bronze badges

Collectives™ on Stack Overflow

ClassCastException: java.lang.Object[] cannot be cast to java.lang.String[] android

5 Answers 5

4 Comments

2 Comments

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

4 Comments

2 Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related