Async Task

Question 1

Explain the role of the UI thread…

Answer 1

The UI thread is the equivalent to the main thread in a Java program. It deals with all user interactions.

Question 2

When the UI thread wants to hand-off to another thread, what does it do?

Answer 2

Sends a hand off request to AsyncTask.

Question 3

Where is the created AsyncTask class located? What class does it extend?

Answer 3

AsyncTask is defined as an inner class.
It extends AsyncTask.

Question 4

What generics are included when extending AsyncTask?

Answer 4

Params
Progress
Result

Question 5

What are the 4 methods in AsyncTask?

Answer 5

onPreExecute( ) -> Configure pre-requisites in the UI thread.
doInBackground( Params ) -> Define the execution of the AsyncThread.
onProgressUpdate( Progress )
onPostExecute( Result )