ClassCastException：JSONArray无法转换为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!

Answer 1

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"));
}

Answer 2

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();        

Answer 3

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
          }