How to convert JSONArray to List?

Extensions Extension Development
#1

I’m trying to create an extension based on an API, I’ve tried in several ways, but I’m not able to get the information that is inside each tag “name”.

I know you have all the code, but I’m at work so I don’t remember the whole code, just this one, at the moment.

String genres = "";
JSONArray jsonArray = json.getJSONArray("genres");
genres = String.valueOf(jsonArray);

Retorna :
“genres”:[{“id”:878,“name”:“Ficção científica”},{“id”:28,“name”:“Ação”},{“id”:12,“name”:“Aventura”}

I want it to return only the information that is inside the “name”

Ficção científica
Ação
Aventura

#2

This is only rough code. If you need those names in list then

public YailList Names(String arrayString) throws JSONException {
  JSONArray jsonArray = new JSONArray(arrayString);
  ArrayList < String > arr = new ArrayList < String > ();
  for (int i = 0; i < jsonArray.length(); i++) {
    JSONObject eachObject = jsonArray.getJSONObject(i);
    arr.add(eachObject.getString("name"));
  }
  return YailList.makeList(arr);
}
#3

If you need in format with each name in a new line as string,

public String Names(String arrayString) throws JSONException {
  JSONArray jsonArray = new JSONArray(arrayString);
  StringBuilder sb = new StringBuilder();
  for (int i = 0; i < jsonArray.length(); i++) {
    sb.append(jsonArray.getJSONobject(i).getString("name")).append("\n");
  }
  return sb.toString();
}
1 Like
#4

But what would it look like inside a “public void” ? :thinking:

I tried this way:

ArrayList<String> genres = new ArrayList<String>();
try {
    JSONArray jsonArray = json.getJSONArray("genres");
     for(int i = 0; i <jsonArray.length(); i++){
     genres.add(jsonArray.getJSONObject(i).getString("name"));

And this was the return.
[Ficção científica, Ação, Aventura]

#5

Show whole code in the method .

How can a public void method have a return?

1 Like
#6

I had to change a few things, but the base is this.

@SimpleFunction(description = "Website source-code")
    public void Movie(final int id, String language) {
        AsynchUtil.runAsynchronously(new Runnable() { 
            @Override
            public void run() {
                try {
                    BufferedReader readStream = new BufferedReader(
                            new InputStreamReader(
                                    (new URL("site")).openStream()));
                    final String data = readStream.readLine();
                    activity.runOnUiThread(new Runnable() { // Sempre acione eventos no thread da IU
                        String jsonResponse = data;

                        public void run() {
                            JSONObject json = null;
                            try {
                                json = new JSONObject(jsonResponse);
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                          ArrayList<String> genres = new ArrayList<String>();
                            try {
                                JSONArray jsonArray = json.getJSONArray("genres");
                                for(int i = 0; i <jsonArray.length(); i++){
                                    genres.add(jsonArray.getJSONObject(i).getString("name"));

                                }
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
#7

I’ve written this code from my phone and formatted using Java formatter. Hope it helps.

@SimpleEvent
public void GotNames(YailList names) {
  EventDispatcher.dispatchEvent(this, "GotNames", names);
}
@SimpleEvent
public void OnError(String error) {
  EventDispatcher.dispatchEvent(this, "OnError", error);
}
@SimpleFunction
public void Movie() {
  HttpURLConnection http = null;
  InputStream inputStream = null;
  (new Thread(new Runnable() {
   @override
    public void run() {
      try {
        URL url = new URL("siteUrl");
        http = (HttpURLConnection) url.openConnection();
        int responseCode = http.getResponseCode();
        if (responseCode / 2 == 0) {
          inputStream = http.getInputStream();
          String res = convertStreamToString(inputStream);
          if (res != null) {
            activity.runOnUiThread(new Runnable() {
             @Override
              public void run() {
                JSONObject jsonObject = new JSONObject(res);
                JSONArray jsonArray = jsonObject.getJSONArray("genres");
                ArrayList < String > arr = new ArrayList < String > ();
                for (int i = 0; i < jsonArray.length(); i++) {
                  JSONObject eachObject = jsonArray.getJSONObject(i);
                  arr.add(eachObject.getString("name"));
                }
                GotNames(YailList.makeList(arr));
              }
            });
          }
        }
      } catch(Exception e) {
        OnError(e.getMessage());
      } finally {
        if (http != null) {
          http.disconnect();
        }
        if (inputStream != null) {
          try {
            inputStream.close();
          } catch(IOException e) {
            e.printStackTrace();
          }
        }
      }
    }
  })).start();
}
private String convertStreamToString(InputStream is) {
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  byte[] buffer = new byte[1024];
  try {
    int len;
    while ((len = is.read(buffer)) != -1) {
      baos.write(buffer, 0, len);
    }
    return baos.toString();

  } catch(IOException e) {
    e.printStackTrace();
  } finally {
    if (is != null) {
      try {
        is.close();
      } catch(IOException e) {
        e.printStackTrace();
      }
    }
    try {
      baos.close();
    } catch(IOException e) {
      e.printStackTrace();
    }
  }
  return null;
}
3 Likes
#8

To convert an array to list:

ArrayList<> list = new ArrayList<>(Arrays.asList(array));
4 Likes
#9

I think, he means JSONArray to YailList :sweat_smile:

1 Like