Question

regarding AsyncTask<ObjectA, ObjectB, ObjectC> parameters, I am always confused about which Object effects what.

One effects my doInBackGround return type, one effects my doInBackGround input type, and the third object effects something else.

When I am changing what kind of things I want to send in and return, this gets very confusing.

What does ObjectA effect

What does ObjectB effect

What does ObjectC effect

(ignore possible misuse of effect/affect)

Answer 1

From the documentation:

ObjectA - doInBackground();

ObjectB - progress indicator: publishProgress(), etc

ObjectC - onPostExecute(), what doInBackground() must return

To actually quote:

AsyncTask’s generic types

---

The three types used by an asynchronous task are the following:

1.Params, the type of the parameters sent to the task upon execution.

2.Progress, the type of the progress units published during the background computation.

3.Result, the type of the result of the background computation.

Not all types are always used by an asynchronous task. To mark a type
as unused, simply use the type Void:

private class MyTask extends AsyncTask<Params, Progress, Result> { ... }