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Well done!
You have completed RxJava!
You have completed RxJava!
Preview
In this workshop we introduced the concepts of RxJava and we walked through converting a simple Todo app to use it. With this concept you can move forward and start using RxJava in many parts of your apps.
Treehouse Workshop: Simplify Networking with Retrofit
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Okay, now that we've converted
to using RX Java form,
0:00
most of the core functionality
of our app lets just kind and
0:03
clean up this code a bit and
then run it and see it in action.
0:06
So, firstly we can do to clean up is we
get rid of this completely change listener
0:09
which we converted into
an observable in the last section.
0:14
So let's go and delete that.
0:20
And in our main activity what
we can do is if you want
0:23
you can convert all these to using
butterknife which is much easier.
0:28
So we can say bind here.
0:33
Or to do adapters here so
we put all of our views together and
1:03
we have our list of data and
our adapter down here.
1:08
It turns out we don't really need
to keep our adapter anywhere else.
1:13
The adapter is not being utilized
any place else outside of on create.
1:17
So what we're gonna do is just
make it a local variable.
1:22
Let's just move it down to here.
1:28
So we're simplifying our main activity.
1:34
Has our views,
it has our data set, our list.
1:38
And it has our subscriptions
Let's make sure that we
1:41
bind so we can get all those views.
1:49
We no longer need to do any of
these look ups by ID here or here.
1:51
So we're gonna create our list.
2:01
And let's go ahead and
2:03
add a few items to our list if
it's the first time we're in here.
2:04
So let's just go ahead down here and
add a new todo.
2:10
This is just so we can run it later
in a minute and see it in action.
2:32
We'll also be able to add our own
items as well through the UI.
2:37
To create our adapter,
make sure we set up our recycler view
2:43
request focus that's fine.
2:48
Do our subscription here, or
toolbar we don't need to do this anymore.
2:51
Let's go ahead and move this up to the top
2:55
We don't need to find our spinner anymore.
3:05
We do need to call setAdapter.
3:11
And actually the last thing that we're
gonna do is we're gonna set the adapter.
3:13
And then we also need to
set on the spinner the last
3:22
selected position so
set selection with the position.
3:27
So we need to keep track
of that filter position.
3:32
Let's go ahead and
add the ability to do that now.
3:35
So up here, we have our list.
3:38
And what we wanna do is just add
the int for the filter position.
3:41
And by default.
3:49
It's going to be, all And then we want
3:51
to save that across rotation too so let's
go ahead and put in a value for that.
3:58
This is our key for our bundle.
4:04
And we want to make sure that
we get that data as well.
4:10
So here savings in state is not nul.
4:13
We want to go ahead and get our filter
positions from our statements and
4:15
stay bundle.
4:20
And we can supply a default, as well.
4:26
And let's make sure we save
it in on save instant state.
4:33
And what we want here is, we wanna get
the item that was currently selected.
4:50
So it's getSelectedItemPosition.
4:57
Okay so we've just cleaned up some things
here and simplified our code a bit.
5:07
Let's go ahead and run it and
see this happen in action.
5:14
Here's the old version.
5:24
Let's see it after we clean it up.
5:26
Here it is so we have the sample items and
we can add another item as well.
5:32
And we can check some and select a filter,
5:41
and see that our UI dynamically
adjusts as we select and check things.
5:47
In this workshop,
we introduced the concepts of RX Java and
5:54
we walked through converting
a simple to do app to use it.
5:58
With this concept you can move forward and
6:02
start using RX Java in many
parts of your own apps.
6:04
To start using RX Java to manage your
networking take a look at retrofit
6:08
which supports RX Java out of the box.
6:12
If you haven't used retrofit before I've
left a link to the retrofit workshop
6:15
in the teacher's notes.
6:19
Thanks for joining me in this workshop.
6:21
I hope RX Java helps you
build better android apps.
6:23
Will see you soon.
6:27
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