how to parse JSONArray in android

Question

I want to read this JSON lines but because it start with JSONArray i'm a little confused

 "abridged_cast": [
 {
 "name": "Jeff Bridges",
 "id": "162655890",
 "characters": [
 "Jack Prescott"
 ]
 },
 {
 "name": "Charles Grodin",
 "id": "162662571",
 "characters": [
 "Fred Wilson"
 ]
 },
 {
 "name": "Jessica Lange",
 "id": "162653068",
 "characters": [
 "Dwan"
 ]
 },
 {
 "name": "John Randolph",
 "id": "162691889",
 "characters": [
 "Capt. Ross"
 ]
 },
 {
 "name": "Rene Auberjonois",
 "id": "162718328",
 "characters": [
 "Bagley"
 ]
 }
 ],

i just need to use the "name" and save all as one String. (the string value will be : Jeff Bridges,Charles Grodin,Jessica Lange,John Randolph,Rene Auberjonois).

this is my code:

try {
 //JSON is the JSON code above
 JSONObject jsonResponse = new JSONObject(JSON);
 JSONArray movies = jsonResponse.getJSONArray("characters");
 String hey = movies.toString();
 } catch (JSONException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }

• Udi Oshi: can you post the full json string?
• Joel Bodega: You are retrieving the array by the wrong name.
• vortexwolf: Should be getJSONArray("abridged_cast") and then for-loop
• digitalmidges: I accidentally wrote "characters" in the code i ment to wrote "name".
• Shreshth Kharbanda: Possible duplicate of android how to convert json array to string array

Answer 1

If you're after the 'name', why does your code snippet look like an attempt to get the 'characters'?

Anyways, this is no different from any other list- or array-like operation: you just need to iterate over the dataset and grab the information you're interested in. Retrieving all the names should look somewhat like this:

List<String> allNames = new ArrayList<String>();
JSONArray cast = jsonResponse.getJSONArray("abridged_cast");
for (int i=0; i<cast.length(); i++) {
 JSONObject actor = cast.getJSONObject(i);
 String name = actor.getString("name");
 allNames.add(name);
}

(typed straight into the browser, so not tested).

• numerah: what about the json of this format [{"id":"1","user":"alll"},{"id":"1","user":"alll"}]
• MH.: @numerah: you have an array without a key, so just parse the json directly into a JSONArray.

Answer 2

getJSONArray(attrname) will get you an array from the object of that given attribute name in your case what is happening is that for

{"abridged_cast":["name": blah...]}
^ its trying to search for a value "characters"

but you need to get into the array and then do a search for "characters"

try this

String json="{'abridged_cast':[{'name':'JeffBridges','id':'162655890','characters':['JackPrescott']},{'name':'CharlesGrodin','id':'162662571','characters':['FredWilson']},{'name':'JessicaLange','id':'162653068','characters':['Dwan']},{'name':'JohnRandolph','id':'162691889','characters':['Capt.Ross']},{'name':'ReneAuberjonois','id':'162718328','characters':['Bagley']}]}";
 JSONObject jsonResponse;
 try {
 ArrayList<String> temp = new ArrayList<String>();
 jsonResponse = new JSONObject(json);
 JSONArray movies = jsonResponse.getJSONArray("abridged_cast");
 for(int i=0;i<movies.length();i++){
 JSONObject movie = movies.getJSONObject(i);
 JSONArray characters = movie.getJSONArray("characters");
 for(int j=0;j<characters.length();j++){
 temp.add(characters.getString(j));
 }
 }
 Toast.makeText(this, "Json: "+temp, Toast.LENGTH_LONG).show();
 } catch (JSONException e) {
 // TODO Auto-generated catch block
 e.printStackTrace();
 }

checked it :)

Answer 3

Here is a better way for doing it. Hope this helps

protected void onPostExecute(String result) {
 Log.v(TAG + " result);
 if (!result.equals("")) {
 // Set up variables for API Call
 ArrayList<String> list = new ArrayList<String>();
 try {
 JSONArray jsonArray = new JSONArray(result);
 for (int i = 0; i < jsonArray.length(); i++) {
 list.add(jsonArray.get(i).toString());
 }//end for
 } catch (JSONException e) {
 Log.e(TAG, "onPostExecute > Try > JSONException => " + e);
 e.printStackTrace();
 }
 adapter = new ArrayAdapter<String>(ListViewData.this, android.R.layout.simple_list_item_1, android.R.id.text1, list);
 listView.setAdapter(adapter);
 listView.setOnItemClickListener(new OnItemClickListener() {
 @Override
 public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
 // ListView Clicked item index
 int itemPosition = position;
 // ListView Clicked item value
 String itemValue = (String) listView.getItemAtPosition(position);
 // Show Alert
 Toast.makeText( ListViewData.this, "Position :" + itemPosition + " ListItem : " + itemValue, Toast.LENGTH_LONG).show();
 }
 });
 adapter.notifyDataSetChanged();
...