Life and Timesfor (int i=progress;
i< 10000 ;
i+= 200 ) {
doSomeLongWork( 200 );
}Step #2: Pause in onPause()................................................................
Now, we need to arrange to have our thread stop running when the activity
is paused (e.g., some other activity has taken over the screen). Since threads
are relatively cheap to create and destroy, we can simply have our current
running thread stop and start a fresh one, if needed, in onResume().
While there are some deprecated methods on Thread to try to forcibly
terminate them, it is generally better to let the Thread stop itself by falling
out of whatever processing loop it is in. So, what we want to do is let the
background thread know the activity is not active.
To do this, first import java.util.concurrent.atomic.AtomicBoolean in
LunchList and add an AtomicBoolean data member named isActive, initially
set to true (new AtomicBoolean(true);).
Then, in the longTask Runnable, change the loop to also watch for the state
of isActive, falling out of the loop if the activity is no longer active:
for (int i=progress;
i< 10000 && isActive.get();
i+= 200 ) {
doSomeLongWork( 200 );
}Finally, implement onPause() to update the state of isActive:
@Override
public void onPause() {
super.onPause();isActive.set(false);
}