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All right we're getting pretty
comfortable with notifications.

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Let's see what we need to add a new
notification for our download service.

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The first thing we need to do
is re-enable our downloads.

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We hijacked the download button a while
ago but let's go back into main activity,

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and here in the on Create method, let's
comment out our test intents method and

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uncomment download songs.

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Now let's open up our
Download Intents Service class.

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We're going to need two
class level variables.

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So let's get those out of the way.

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Up here at the top,
let's add a private Notification Manager,

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which we will use to
manage our notifications.

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Let's call it M.notificationManager.

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The second is a unique ID we need
to identify this notification

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private static final int.

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Let's call it notification
underscore ID and

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we'll set it equal to something
kind of random like 22.

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I just double the 11 that we're
using from the other service.

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Now let's look at this
on handle intent method.

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We're already getting the song
title in the song variable so

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we can just use that in the title for
a notification.

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Let's start building one just like before.

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So before we call download song,
let's add a few lines and

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we'll say notification.Builder,

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let's call it builder equals
a newNotification.Builder and

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for the parameter it needs
the context which is this.

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Let's chain methods together again.

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So on the next line let's call, .set
Small Icon, and we'll use the same icon

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that we swapped out in the last service
R.drawable.ic queue music white.

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Next let's set the content
title to downloading.

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And then we'll set the content
text as the song title

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which we have in the song variable.

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These three pieces of information,
an icon, a title, and

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some supporting text are the minimum
required data for notifications.

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Next we need to set our notification
manager from the system service used for

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notifications am notification manager
equals and we're going to need a cast so

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it's a cast to notification manager.

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We'll call get system service and the name
is from contacts.notification service.

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I'm going to drop this to a new line so
it all shows up here on my screen.

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Finally we can start the notification
by calling the notify method so

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mNotificationManager.notify.

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We need to pass in that ID,

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notification ID and we need to
pass in the notification itself.

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We haven't built it yet but we can just
do it right here we can say builder.

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.build.

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All right, let's try this and
see if it works.

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Actually before we do I'm going to
speed up these fake downloads by

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changing 10 to 2 here in
our endTime calculation.

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Okay, now let's run it.

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Okay, so now we can click on the download
button and we see our notification, cool.

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And if we pull this down.

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Got a bug.

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We have the icon and the title.

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But we don't have the song title.

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Let's take a look and see what's going on.

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So if we come back up here,
we're setting the song as the extra.

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But it's a string extra.

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I think I know what's happening.

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So back in main activity,

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if you remember, we switched it to pass
in a whole song instead of just a string.

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So Let's go to download songs, and

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here we have a loop running
through all of the songs and

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it's trying to put it as an extra as
a whole song object, that's cool,

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so back in our intent service, we need
to change this to get a song variable,

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and you need to change this
method to get Parcelable Extra.

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Now we can call song.get
title where we need it.

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And we'll pass in just the string
title here because that's all that's

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required for
this download song method song.getTitle.

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Okay, let's try this again.

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Okay, we'll go for a download.

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And this time.

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Okay, there we go.

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We see it cycling through.

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It's downloading each song as
it works through the loop.

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But notice that it doesn't disappear at
the end when all the downloads are done.

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We need to cancel each notification
when each download is complete.

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We'll do it by using
the notification manager,

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here at the end of
the download song method.

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Let's add a line and
say mNotificationManager.cancel we

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need to pass in the ID which we
already set as notification ID.

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That's how we can manage a specific
notification by giving it an ID.

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And I want to show one more thing.

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Up here we're building it, let's change
one more method let's call, .setProgress,

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and pass in the parameters 0, 0, and true.

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This can be customized to show
a calculated value but by using 00 and

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true, we can create
an indeterminate progress bar.

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So here let's watch how it works.

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This time as we download things
get the notification and

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we will see a download bar showing
that it's doing some activity.

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And if we wait for the last one it will
disappear when all the downloads are done.

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Cool.
It's working.

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All right, so as extra practice why
don't you make it so that the user can

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tap on these notifications and view
a specific song in the detail activity.