Cleaning Your Code

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