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The Problem with Threads
1:58In this video we see why we need to use Services!
We've learned the ton about threads, but
now it's time we see why services exist.
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Let's start by opening
the Android device monitor.
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And then running our app.
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Then let's find our app
in the list on the left
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click it, and then click up
here to show our app's threads
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Notice that this time our downloadThread
already exists because we now create
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it in the on create method instead of
when we click the download button.
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Now let's click the download button and
watch our song start to download.
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After ten seconds we can see them start
downloading in the log messages below.
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And another ten we get another song.
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But now with our app still selected
let's click this stop sign up here
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to kill our process.
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Immediately we can see that
the app is no longer running and
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if we give it a few seconds we can tell
that our download thread has stopped too.
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No more log messages.
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Now I know what you're thinking,
this isn't that surprising.
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You killed the app, but
of course everything stopped.
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But it didn't have to be that way
since processes are routinely kiln
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to free up resources, Android provides
us with a way of dealing with this and
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that way is services.
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