Question

I’ve used the AsyncTask example from vogella website, I’ve created a class file with it.
I’m calling it from Activity A to update the postalcode’s TextView, it’s working.

I’m wondering how can I call the same AsyncTask from Activity B to update another postal code TextView.

So one AsyncTask, 2 calls from different Activities to update different TextViews.

I’ve to do something onPostExecute(), right?
Some example code, is much appreciated.

Thanks in advance

Answer 1

You can (I guess) pass the TextView to the AsyncTask when you instantiate it.

All without the IDE open so apologies if the syntax is off…

public class ExampleTask extends AsyncTask<Void, Void, Void> {
    private TextView targetTextView;

    public ExampleTask(TextView target) {
     targetTextView = target;
    }

    @Override
    protected String doInBackground(Void... orSomething) {
      //do work and get a value I guess
    }

    @Override
    protected void onPostExecute(String result) {
      targetTextView.setText(result);
    }
  }

Then you’d call this:

ExampleTask task = new ExampleTask(theTextViewToUpdate);
task.execute();

You’d want to be careful about the scope of the task objects you instantiate as that reference to a TextView could end up leaking memory from your activities.