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Android Studio includes Gradle, a build system for Android projects. Gradle includes dependency management, which allows us to easily include 3rd party code like OkHttp.
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We left off with the general
knowledge of the OkHttp API.
0:00
We've been looking at
the project page on GitHub.
0:04
But let's turn our attention to
the project's website shown here.
0:06
I've included links for
this in the teacher's notes as well.
0:12
The project's site provides additional
information about the library and
0:15
has some examples.
0:18
One thing to note that is shown here is
the minimum requirements for using OkHttp.
0:20
We need to be using Android 2.3 and
Java 1.7.
0:28
There are newer versions of both
of these at this point, but
0:32
it is something to check and consider.
0:36
We're using Gradle for our project, and
0:38
if we look here in the download section,
we see a Gradle statement we can use.
0:40
It's also listed over in
their GitHub repository.
0:45
So let's copy this line, and
head back to Android Studio.
0:54
In the project pane we need
to expand Gradle scripts,
1:01
and the build.gradle file for our app.
1:09
This one here, we don't want the Stormy
project file, we want the app file.
1:15
Android Studio has a main module,
1:21
typically called app,
it has application-specific code.
1:23
This is the file in which we can
paste our line of code from OkHttp.
1:27
Looking in here, though,
where should It go?
1:32
This Gradle file doesn't look
at all like Java code, right?
1:34
Well, it isn't.
1:38
Gradle is an automated build system used
in Android development, and elsewhere.
1:40
It allows us to configure a few things,
and in exchange, it does a lot of work for
1:45
us automatically behind the scenes.
1:50
It's a huge time saver,
and once it is setup for
1:52
a specific project,
we don't have to do much else.
1:55
Another productivity enhancement,
very cool.
1:59
When using an outside resource,
such as OkHttp,
2:02
our Stormy app depends on that library,
Gradle excels at managing dependencies.
2:06
And hey, look at this,
2:11
there is a section in our build.gradle
file called dependencies.
2:13
That's where we'll paste our
line of code from OkHttp.
2:17
So we can go right down here
under this last implementation,
2:22
and we'll paste in our line from OkHttp.
2:25
Let's quickly talk about this build file.
2:30
This Android section up here at
the top provides settings for
2:32
things like the SDK version,
and our default configuration.
2:35
The dependencies section,
where we just added our code,
2:40
tells Gradle about external
dependencies we'd like it to manage.
2:43
We can see that there is a file tree where
Gradle watches for Java archive files, or
2:47
JAR files, in the Libs directory.
2:51
Some third-party libraries
are still used via JAR files, and
2:53
Gradle can keep track of those.
2:57
There are some additional dependencies
in here relating to testing and
2:59
compatibility features.
3:02
The format, though, is the same.
3:04
In our case, the com.squareup.okhttp3
tells Gradle where to find the file,
3:06
that OkHttp is the library to get,
and that 3.10.0 is the version to use.
3:14
When a new version comes out, you can
come back here to this build.gradle file,
3:22
update the version number and
synchronize the new changes.
3:26
Which reminds me, anytime we make changes
in this file, we need to sync the changes.
3:30
This allows Gradle to update the project,
and
3:35
get any additional files
our project may need.
3:38
You'll notice that Android Studio displays
a warning up here about this as well.
3:41
We can either click the Sync Now link, or
3:46
click on this button to
perform a project sync.
3:51
After Gradle all goes and
rebuilds the project,
3:58
which depending on your system and
network can take a few moments,
4:00
we see a message that Gradle build
finished, down here at the bottom.
4:03
Once we see that message, we're all set.
4:08
If, however,
4:11
you get an error, try using your Google
skills to find out what happened.
4:12
Check the Teacher's Notes to see
if there are any updates, or
4:16
ask questions in the Treehouse forum.
4:19
With OkHttp installed and
all set to go, we're ready to use it.
4:22
We head back to the OkHttp website here;
we can look for the examples.
4:26
There's also other links to
resources on this page as well,
4:33
such as Javadocs, their Wiki,
and StackOverflow.
4:38
The OkHttp Wiki has some
decent usage examples, and
4:42
I encourage you to have a look around
before we come back together and
4:46
make our first http get
request from Stormy.
4:50
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