How to get a JSON object data from AsyncTask?

Question

I have an MainActivity class. one Login class which extends AsyncTask. after execute Login class, it will return JSONObject to MainActivity like:

AsyncTask<Void, Void, JSONObject> getData = (new Login()).execute();

Now how can I separate data from getData?

my returned JOSNObject will looks like:

{"FirstName":"A","LastName":"B","ID":"09","Cell":"0123456789","Email":"abc@yahoo.com"}

or do I need to handle these in different way?

I know that but I want to get data in my MainActivity class instead — user5296685, Oct 08 '15 at 17:15
you can store these `value` in your local variable in `onPostExecution` method — Iamat8, Oct 08 '15 at 17:19

score 1 · Accepted Answer · answered Oct 08 '15 at 17:02

1

You can try this on doInBackground:

JSONObject json = new JSONObject(StringResponse);

String FirstName = json.getString("FirstName");
String LastName = json.getString("LastName");
String ID = json.getString("ID");
String Cell= json.getString("Cell");
String Email= json.getString("Email");

Now you have data separate on differents strings.

answered Oct 08 '15 at 17:02

Aspicas

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I know this procedure but I want to get data in my MainActivity class instead – user5296685 Oct 08 '15 at 17:09
You can save that strings on `ArrayList` and past Array to another `Activity`, using...for example...a `Bundle and Intent` or `SharedPreferences` – Aspicas Oct 08 '15 at 17:16
ok thanks, if I follow your first solution then I need to start one activity from the Login class. I googled but unable to get solution for that. can you please try to solve my prob ? – user5296685 Oct 09 '15 at 04:34
You can make a `Splash Screen` search on google about that, it's easy. Tell me if you have any problem. =) – Aspicas Oct 09 '15 at 06:17

score 0 · Answer 2 · edited May 23 '17 at 11:52

To pass data from AsyncTask to your Activity you can create a call back method.

First create a Interface

public interface OnTaskCompleteListener{
  public void onTaskCompleted(JsonObject jsonobj);  
}

Then implement and override its method in Activity

public class MainActivity extends Activity implements OnTaskCompleteListener{
  @Override
  public void OnTaskCompleted(JsonObject jsonobj)
  {

  }

And lastly pass data from your AsyncTask

public class Login extends AsyncTask<Void, Void, JSONObject>{ 
private OnTaskCompleteListener listener;

public Login(OnTaskCompleteListener listener){
    this.listener=listener;
}
protected void onPostExecute(JsonObject obj){
    listener.onTaskCompleted(obj);
}
}

I hope this is what you wanted. You can refer this question in case of doubts:

android asynctask sending callbacks to ui

How to get a JSON object data from AsyncTask?

2 Answers2