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

Question

Hi I am trying to display the error messages stored in the following JSONObject obj

{"errors":["nickname is already taken,","email is already taken"]}

This is my implementation:

TextView errorMsg;
errorMsg = (TextView)findViewById(R.id.register_error);
String[] errorArray = (String[])obj.get("errors");                                       
errorMsg.setText(errorArray[0]);                                                         
Toast.makeText(getApplicationContext(), errorArray[0], Toast.LENGTH_LONG).show();

However when trying to run the code, I get a ClassCastException

Can anyone explain to me the issue and how I can resolve it?

Thanks!

Sterling · Accepted Answer · 2016-08-27 05:44:47Z

3

The "errors" array in your example isn't a String array (String[]), it's a JSONArray.

Instead, do

JSONArray errorArray = obj.getJSONArray("errors");

then,

errorMsg.setText(errorArray.getString(0));                                                         
Toast.makeText(getApplicationContext(), errorArray.getString(0), Toast.LENGTH_LONG).show();

answered Aug 27, 2016 at 5:44

Sterling

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1 Comment

Eddoasso Over a year ago

A small note for someone stumbling into this like me. JSONArray extends ArrayList. So if you want you can just do "ArrayList<String> items = obj.getJSONArray("errors"); String[] arr = items.toArray()"

Durgpal Singh · Accepted Answer · 2016-08-27 05:48:01Z

2

The 'erros' array is not String array. So get value in JSONArray do this.

JSONArray errorArray = obj.getJSONArray("errors");

you can convert it.

List<String> list = new ArrayList<String>();
for(int i = 0; i < arr.length(); i++){
    list.add(arr.getJSONObject(i).getString("name"));
}

answered Aug 27, 2016 at 5:48

Durgpal Singh

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Comments

Imran · Accepted Answer · 2016-08-27 05:57:09Z

1

Here it's an JsonArray and not an String array so use library like simple-json from google and parse using below code:

       JSONArray erroeArray= (JSONArray) jsonObject.get("errors");
        Iterator<String> iterator = erroeArray.iterator();
          while (iterator.hasNext()) {
            //yourcode here
          }

answered Aug 27, 2016 at 5:57

Imran

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