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Use `CompositeSubscription` to manage all subscriptions.
On Android it's common that during
rotations we need to release
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any resources we have, and allow our
activity to be rebuilt by the system.
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This means we need to unsubscribe to all
these subscriptions that we've set up.
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So here we have our combined
latest subscription, and
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we also had our clicks for adding new
items both of those subscriptions.
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We need to unsubscribe to
those during on destroy, and
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there's a common pattern for doing this,
and it's called composite subscription.
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So let's go ahead and go up to
the top here, and what we're going
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to do is we're going to add in a new
type called composite subscription.
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We're gonna call it subscriptions and
create a new composite subscription.
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So what this is gonna do is this is
going to allow us to merge together or
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handle and keep track of all our
subscriptions in a single place.
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So it's just delegates to all
subscriptions we add to it.
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So we're gonna do now is add to
our current subscriptions to this
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composite subscription.
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So let's go down here, and
where we did our combine latest.
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Let's go ahead and do, subscriptions.add,
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and add in this entire subscription.
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And let's go ahead and
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go back up to our clicks, and
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go ahead and add this one as well.
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Okay, so what we can see is that
we added our subscriptions for
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our observables to this composite
subscription, here and here.
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And then what we're gonna do is down and
on destroy,
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we'll be able to actually unsubscribe
to these all together at the same time.
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So it's really easy.
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We just go down here, and
we say subscriptions.unsubscribe.
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And that's it.
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