Question

I have an issue where I need to access a method in my Activity from Android AsyncTask’s onPostExecute() method

I have 2 Activities both contain a common method as below:

(1) Activity1 — > refreshUI()
(2) Activity2 —-> refreshUI()

I got one AsyncTask call GetDataAsyncTask(Activity a ) which takes calling activity as argument

Now from my activity1 I will call new GetDataAsyncTask(Activity1.this).execute.
Same as above from my activity2 I will call new GetDataAsyncTask(Activity2.this).execute.

My AsyncTask is as below :

public class GetDataAsyncTask extends AsyncTask<String ,Void , String> {
    public Activity context;

    public PostAsyncTaskHelper(Activity c) { 
        context = c; 
    }

    protected String doInBackground(String... arg0) {
        // Webservice calls 
    }

    protected void onPostExecute(String result) {
        if(result.equals("qq")) {
            //Where I am not able to access refreshUI() 
            //method of any one of my activities
            context.refreshUI()  
        }
    }
}

Can anyone help me how to get reference of any of the called activities from AsyncTask?

Answer 1

Define an interface for your Activities

public interface MyActivityRefreshInterface
{
 public void refreshUI();
}

your Activities must be defined as implements MyActivityRefreshInterface.

Your onPostExecute can then cast the context as (MyActivityRefreshInterface)context