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Alright, so this adapter's

2
00:00:06,483 --> 00:00:09,220
going to use a cursor as the source of

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the data to be displayed.

4
00:00:10,930 --> 00:00:13,470
So we need a field to hold the cursor.

5
00:00:13,470 --> 00:00:15,830
So I'm gonna add that to the class constructor.

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00:00:15,830 --> 00:00:17,180
What we have to do is specify

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00:00:17,180 --> 00:00:19,390
the nullable type cursor question mark

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00:00:19,390 --> 00:00:21,380
because the cursor, our cursor,

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00:00:21,380 --> 00:00:24,640
will be null until we've downloaded the data.

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So let's have a go at doing that.

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So we're gonna add in parentheses after the class name,

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private

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00:00:34,250 --> 00:00:35,720
var

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00:00:35,720 --> 00:00:36,553
cursor:

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00:00:37,850 --> 00:00:40,290
and Cursor? as I mentioned.

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Let's now edit that cursor to the constructor.

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Alright, so there's three methods we have to implement

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00:00:45,090 --> 00:00:48,420
to satisfy the RecyclerViewAdapter contract.

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00:00:48,420 --> 00:00:51,240
Now I've mentioned before that an interface is a contract

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00:00:51,240 --> 00:00:53,230
and if you implement an interface

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00:00:53,230 --> 00:00:55,248
then you have to provide an implementation

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of all the methods that the interface defines.

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The same is true when you extend an abstract class,

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00:01:02,100 --> 00:01:05,069
your class has to provide an implementation

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00:01:05,069 --> 00:01:08,590
of all the methods defined in the abstract-based class

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00:01:08,590 --> 00:01:09,670
that you're extending.

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So, what I'll do here,

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is I'll get Android Studio to generate

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the methods we need to implement.

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Just using Control + I and that's obviously

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with a cursor already inside the class bodies.

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You can see I've got.

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Now select all three.

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Just press Enter there to create them.

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Now in terms of these methods,

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I prefer to have the onBindViewHolder function

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appear immediately after the onCreateViewHolder.

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So, if your codes generated in a different order as mine is,

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00:01:35,640 --> 00:01:37,250
just cut and paste to rearrange it.

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I'm going to do that now.

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Personal preference of where it should be.

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It's not an issue though,

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as far as the compile is concerned,

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but it makes it easier,

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00:01:48,190 --> 00:01:51,012
if you want to compare your code to mine, ultimately.

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00:01:51,012 --> 00:01:52,760
Also, I take this opportunity

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to change the parameter names for these first two functions.

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Android Studio sometimes just gives them the names,

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p0, p1, etc.,

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which is done here,

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when that's not really very informative.

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Alright, starting off with on line 25.

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We'll change p0, that should be parent,

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for first argument.

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And the second one is the viewType.

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Alright, and then for the second method on line 29,

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00:02:18,970 --> 00:02:22,250
we're going to go with holder, instead of p0

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for the argument name.

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And, for the second one, it's gonna be position.

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I think that's a bit more informative

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and makes more sense now reading.

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And with same as three methods before,

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onCreativeViewHolder is called by the RecyclerView

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when it needs a new view to display.

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The flicker browser app displayed

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the same details in each line in the RecyclerView

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and this app does the same.

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But the RecyclerView can be used to display

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different things of each row.

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You give it a valid view

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and it will display it at the correct position.

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And, that's why there's a viewType parameter,

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so your function can respond to the type that's requested

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and return different views, accordingly.

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Best example of that, think about ChatApp.

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The views for the incoming message

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may have the text to appear to the left,

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while the messages being sent from the device

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have them on the right.

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Now that's a bit simplified

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and you'd probably implement that

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00:03:13,450 --> 00:03:16,900
by starting the widgets before sending the view back,

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but how about if an incoming message contained a file?

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You may have in return a different view

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that included an image view widget to display the picture.

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If the file type wasn't a recognised type of image,

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00:03:28,002 --> 00:03:31,450
you can add a button to download the file instead.

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So, this involves implementing getArt and viewType,

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so that you can switch

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the type of view at any given position.

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But, we display in the same kind of data

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throughout the RecyclerView list,

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so we can safely ignore that viewType argument.

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And we're not gonna be displaying

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different types of views in our list,

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but if you want to do that,

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then you know now how to search for something like

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00:03:51,670 --> 00:03:54,977
RecyclerView, getArt, and viewType.

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00:03:54,977 --> 00:03:57,070
Alright, so our onCreateViewHolder

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function will just inflate a view

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00:03:59,030 --> 00:04:01,910
from the task_list_items layout

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that we created earlier and then return that view.

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So, let's write some code for that.

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We're gonna delete the TODO

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and we'll start with

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a Log.d,

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in parentheses, TAG and double quote,

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onCreateViewHolder,

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because that's the functionary,

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and we'll put new view requested,

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so we can see that in our log.

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Alright, so the code next line is val view =,

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it's gonna be LayoutInflater

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It's gonna be .from,

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in parentheses; parent.context,

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closing parenthesis, .inflate,

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and parenthesis again,

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R.layout.task_list_items,

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and then ,parent, false

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and then we got a closing raw parenthesis on the end there,

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which we can see down there.

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Alright, then the last line we're going to return

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a new TaskViewHolder object.

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The TaskViewHolder,

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in parenthesis will be view that we created

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on the previous line.

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So, that's onCreateViewHolder

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and again that's just inflating a view

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from the task_list_items layout,

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that we created earlier,

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and after inflating the view,

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it returns the view.

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Alright so next is our onBindViewHolder function

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and that's called when the RecyclerView wants new data

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to be displayed and is providing

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an existing view to be re-eused.

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So this is where we put our data

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into the individual widgets.

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In case it's not obvious,

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a call to onCreateViewHolder will be followed

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by a call to onBindViewHolder.

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The RecyclerView first requests a new view,

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then sends the view back so that we can put data into it.

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So let's implement that.

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So, I'm going to delete the TODO.

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And we'll start with a log.

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So I have log.d, parentheses,

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TAG, "onBindViewHolder

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:starts" logging message.

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You're going to avoid some problems

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00:06:06,730 --> 00:06:07,740
with the smart cast again.

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00:06:07,740 --> 00:06:10,360
So, val cursor = cursor

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now just to make it clear,

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we're going to put that in a comment

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for some regular code in the future.

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Of course we talked about that previously.

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Alright, first in length then we want

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to check to see whether the cursor is null,

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00:06:24,750 --> 00:06:27,530
or it has a count of zero.

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Now record if, parenthesis, cursor = null,

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00:06:32,410 --> 00:06:35,020
or cursor.,

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00:06:35,020 --> 00:06:36,670
or cursor.count.

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00:06:36,670 --> 00:06:38,970
I'm trying to use the word period instead of dot.

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00:06:38,970 --> 00:06:42,230
For dots very normal for me to use in Australia,

165
00:06:42,230 --> 00:06:44,030
but it's not something that's used over-seas,

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00:06:44,030 --> 00:06:45,740
so I'm trying to use the word period

167
00:06:45,740 --> 00:06:46,880
on a consistent basis,

168
00:06:46,880 --> 00:06:48,260
so bear with me there,

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00:06:48,260 --> 00:06:50,427
so that everyone knows what I'm talking about.

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= 0

171
00:06:52,670 --> 00:06:55,130
Then we're just going to log a message.

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Basically what we're doing,

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00:06:55,963 --> 00:06:57,530
is we're providing some instructions,

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if this is the first entry.

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00:06:59,530 --> 00:07:03,083
So Log.d parentheses TAG,

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00:07:04,160 --> 00:07:05,330
then our message will be

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00:07:05,330 --> 00:07:06,180
onBindViewHolder:

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00:07:09,909 --> 00:07:11,210
providing instructions,

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00:07:11,210 --> 00:07:13,890
so again we know what's going on in the log.

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00:07:13,890 --> 00:07:17,060
Then we're gonna set the T line name field properly

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00:07:19,040 --> 00:07:19,873
to instructions.

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00:07:19,873 --> 00:07:21,253
So holder.tli_name.

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00:07:23,985 --> 00:07:26,760
setText parentheses,

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00:07:26,760 --> 00:07:28,310
and it's gonna be Instructions,

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in double quotes.

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00:07:31,720 --> 00:07:34,740
Android Studio should've added the synthetic import of

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00:07:34,740 --> 00:07:38,977
kotlinx.android.synthetic.main.task_list_items.*

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And the one I'm talking about is the one there on line ten.

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So it's done that for us automatically.

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What we've done there,

191
00:07:46,473 --> 00:07:49,240
is enabled the use of synthetic imports

192
00:07:49,240 --> 00:07:51,680
in our ViewHolder class by implementing

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00:07:51,680 --> 00:07:54,080
the LayoutContainer interface that we did last video,

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00:07:54,080 --> 00:07:55,670
and I think that's pretty cool.

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00:07:55,670 --> 00:07:56,640
Alright, with that said,

196
00:07:56,640 --> 00:07:58,100
let's now finish the function,

197
00:07:58,100 --> 00:07:59,790
so go back down to where we were.

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00:07:59,790 --> 00:08:02,190
Now onBindViewHolder.

199
00:08:02,190 --> 00:08:04,720
We're testing for no records there.

200
00:08:04,720 --> 00:08:05,553
What we need to do,

201
00:08:05,553 --> 00:08:06,390
we'll set instructions,

202
00:08:06,390 --> 00:08:08,770
we need to update the other fields as well.

203
00:08:08,770 --> 00:08:11,123
So it's gonna be holder.tli_description

204
00:08:15,230 --> 00:08:17,817
and we set that to an empty string.

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00:08:17,817 --> 00:08:21,020
.setText parenthesis, two double quotes,

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00:08:21,020 --> 00:08:24,790
you wanna hide the edit and delete properly,

207
00:08:24,790 --> 00:08:25,957
so holder.tli

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00:08:27,046 --> 00:08:29,105
_edit

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00:08:29,105 --> 00:08:30,963
.visibility =

210
00:08:32,130 --> 00:08:34,393
and we'll set that to View.GONE.

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00:08:35,419 --> 00:08:36,738
We'll do the same with delete.

212
00:08:36,738 --> 00:08:40,534
So holder.tli_delete

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00:08:40,534 --> 00:08:43,100
.visibilty =

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00:08:43,100 --> 00:08:45,313
View.GONE.

215
00:08:46,600 --> 00:08:48,310
Alright, so if the cursor was null,

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00:08:48,310 --> 00:08:49,540
there's no records.

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00:08:49,540 --> 00:08:51,040
We now need to add an else clause,

218
00:08:51,040 --> 00:08:53,970
which is obviously gonna be taken up,

219
00:08:53,970 --> 00:08:55,010
if that's not the case,

220
00:08:55,010 --> 00:08:56,067
in other words, we have got some dollars.

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00:08:56,067 --> 00:08:59,380
Now the else will be wiping the code block.

222
00:08:59,380 --> 00:09:00,590
First we wanna try and see

223
00:09:00,590 --> 00:09:02,610
whether we can move to another position,

224
00:09:02,610 --> 00:09:06,310
so we do that by typing if, parenthesis, not,

225
00:09:06,310 --> 00:09:07,843
cursor.moveToPosition,

226
00:09:09,960 --> 00:09:12,630
in parenthesis, position,

227
00:09:12,630 --> 00:09:14,318
closing your right parentheses.

228
00:09:14,318 --> 00:09:15,820
I'm not gonna code block,

229
00:09:15,820 --> 00:09:17,360
and if we can't move to that position,

230
00:09:17,360 --> 00:09:19,120
we're gonna throw an illegal state exception.

231
00:09:19,120 --> 00:09:21,673
So throw IllegalStateException

232
00:09:22,964 --> 00:09:24,163
and in parentheses,

233
00:09:25,590 --> 00:09:26,800
we'll put a message to that effect,

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00:09:26,800 --> 00:09:29,910
Couldn't move cursor to position

235
00:09:30,947 --> 00:09:31,780
$position.

236
00:09:33,490 --> 00:09:35,580
Obviously we had an error trying to do that.

237
00:09:35,580 --> 00:09:37,570
Alright, that's handled that scenario.

238
00:09:37,570 --> 00:09:39,600
Now assuming that we got past that

239
00:09:39,600 --> 00:09:41,400
and haven't thrown an error,

240
00:09:41,400 --> 00:09:42,840
We're gonna create a task object from

241
00:09:42,840 --> 00:09:44,460
the data that's currently in the cursor,

242
00:09:44,460 --> 00:09:47,180
so we'll put a comment to that effect.

243
00:09:47,180 --> 00:09:48,470
Create a Task object

244
00:09:50,510 --> 00:09:52,360
from the data in the cursor.

245
00:09:55,607 --> 00:10:00,607
Now we'll start by typing val task = Task parentheses.

246
00:10:02,030 --> 00:10:04,037
Now you're gonna type cursor.getString,

247
00:10:06,545 --> 00:10:07,550
now we've got parentheses there,

248
00:10:07,550 --> 00:10:09,630
then I'll type cursor.getColumnIndex

249
00:10:11,580 --> 00:10:13,410
and parenthesis again

250
00:10:13,410 --> 00:10:16,973
and then TasksContract.Columns.

251
00:10:18,424 --> 00:10:19,970
TASK_NAME,

252
00:10:19,970 --> 00:10:22,470
first field, comma,

253
00:10:22,470 --> 00:10:25,090
and then the next one will be cursor.getString.

254
00:10:25,090 --> 00:10:26,860
Let's save a bit of time here

255
00:10:26,860 --> 00:10:30,413
and let's just take a copy of these next two.

256
00:10:32,130 --> 00:10:34,530
So, on line 53 it's

257
00:10:34,530 --> 00:10:35,820
cursor.getString,

258
00:10:35,820 --> 00:10:38,630
then cursor.getColumnIndex,

259
00:10:38,630 --> 00:10:40,440
and this time it's gonna be basically

260
00:10:40,440 --> 00:10:43,550
task description instead of task name,

261
00:10:43,550 --> 00:10:46,900
and the last one is going to be task sort order.

262
00:10:46,900 --> 00:10:49,350
So task sort order.

263
00:10:49,350 --> 00:10:51,430
The last one isn't gonna have a comma,

264
00:10:51,430 --> 00:10:52,611
'cause we're closing off the line,

265
00:10:52,611 --> 00:10:55,140
so we're gonna have a third raw parentheses,

266
00:10:55,140 --> 00:10:56,377
and of course the third one is

267
00:10:56,377 --> 00:10:58,830
the string sort order is in Int.

268
00:10:58,830 --> 00:10:59,813
So .getInt.

269
00:11:01,944 --> 00:11:04,053
Alright, so that fixes up that error.

270
00:11:05,100 --> 00:11:06,830
Alright so, now that we've done that,

271
00:11:06,830 --> 00:11:09,460
We'll put another comment down here

272
00:11:09,460 --> 00:11:10,880
just to remind us about the ID,

273
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so, remember that the ID isn't set in the constructor.

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We need to set that manually.

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Task.id = cursor.

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And we want to do getLong,

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parentheses, and it's going to be

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cursor.getColumnIndex,

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in parantheses again,

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it's going to be TasksContract.Columns.ID,

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and closing in raw parentheses.

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The last thing we need to do is,

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use the holder object to update our field.

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So, holder.tli_name.text.

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Like I said, our fields,

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but of course it's our text views we're updating here.

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Set that = task.name.

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That's the first one, then we got three more to do.

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Tli_description we'll set that =

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task.description.

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Then for our edit and delete,

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holder.tli_edit,

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00:12:16,895 --> 00:12:20,895
.visisbilty, we'll set that = View.VISIBLE.

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Now we'll do the same for delete.

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00:12:24,346 --> 00:12:27,929
Holder.tli_delete.visibilty

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= View.VISIBLE.

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I think I've got an extra raw parentheses there,

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which I will delete.

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00:12:37,570 --> 00:12:39,040
And I missed something in there,

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it should have been .text,

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so tli_description.text

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00:12:44,964 --> 00:12:48,000
= task_description, that fixes that.

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Alright now, the description text,

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this is for the instructions,

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which we've got currently on line 42,

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is quite long.

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It provides basic instructions to the user

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when the app first loads up.

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Obviously we've got the name defined as instructions,

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but the text is an empty string at the moment.

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Now I'm sure you don't want

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to see me typing in a load of text,

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so what I'm going to do,

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is paste in the holder. description line

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00:13:09,610 --> 00:13:11,010
with the text we want.

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00:13:11,010 --> 00:13:12,490
You can pause the video to catch up,

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00:13:12,490 --> 00:13:13,323
and what I'll also do,

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00:13:13,323 --> 00:13:16,847
is I'll put it in the resources section as a text file,

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00:13:16,847 --> 00:13:18,710
you can grab it from there and copy and paste

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if you'd prefer to do that.

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00:13:19,820 --> 00:13:20,653
So let's do that.

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I'm gonna change line 42

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00:13:24,880 --> 00:13:27,070
and paste in the description.

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00:13:27,070 --> 00:13:28,200
Okay.

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00:13:28,200 --> 00:13:30,030
Once again, this is all very similar

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00:13:30,030 --> 00:13:32,010
to what we did in the flicker browser app.

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Instead of retrieving the data from a list,

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00:13:34,450 --> 00:13:36,420
we get data from a cursor and use it

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00:13:36,420 --> 00:13:38,600
to create a new task object.

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00:13:38,600 --> 00:13:40,060
If the cursor is null,

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00:13:40,060 --> 00:13:42,300
and we can see some of the code there,

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or it contains no rows,

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00:13:43,530 --> 00:13:46,025
then we put some instructions in the description text view,

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and the heading in the name.

335
00:13:47,590 --> 00:13:52,510
We've seen \n used before to insert a long break in text.

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00:13:52,510 --> 00:13:54,670
We just formulate a text there for description

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00:13:54,670 --> 00:13:57,130
so that it looks better when it's displayed.

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00:13:57,130 --> 00:13:59,850
We also set the buttons to be invisible;

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lines 47 and 48.

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00:14:01,750 --> 00:14:04,050
There's a view.invisible view value defined,

341
00:14:04,050 --> 00:14:06,360
but I've used View.GONE instead.

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00:14:06,360 --> 00:14:08,220
It's very similar to invisible,

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00:14:08,220 --> 00:14:11,292
but the widget also takes up no space in the layout.

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00:14:11,292 --> 00:14:13,700
The other layout is a description text view widget

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00:14:13,700 --> 00:14:15,980
to fill the entire width of the display.

346
00:14:15,980 --> 00:14:16,930
Once the code's running,

347
00:14:16,930 --> 00:14:19,710
try changing those two settings to view.invisible

348
00:14:19,710 --> 00:14:21,500
to see the difference that it makes.

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00:14:21,500 --> 00:14:23,210
As long as we have a valid cursor

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00:14:23,210 --> 00:14:26,710
that contains at least one row for code in the else block,

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00:14:26,710 --> 00:14:28,310
starting on line 50,

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00:14:28,310 --> 00:14:30,440
moves to a correct position in the cursor.

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00:14:30,440 --> 00:14:32,290
And obviously, that's assuming that we don't get

354
00:14:32,290 --> 00:14:34,360
an error trying to move to that position.

355
00:14:34,360 --> 00:14:36,880
After that, we're retrieving the values from the cursor

356
00:14:36,880 --> 00:14:39,640
and using them to set the text in the TextView widgets.

357
00:14:39,640 --> 00:14:42,220
We can also make the buttons visible again

358
00:14:42,220 --> 00:14:47,120
down there towards the bottom on lines 64 and 65.

359
00:14:47,120 --> 00:14:49,410
We're gonna add onClick list this to the buttons.

360
00:14:49,410 --> 00:14:50,740
So what I'll do there for those two,

361
00:14:50,740 --> 00:14:53,563
is we'll make a note to that effect, as a TODO.

362
00:14:54,560 --> 00:14:56,500
So I'm gonna put a TODO there

363
00:14:56,500 --> 00:14:59,613
to remind us to add an onClick.

364
00:15:01,988 --> 00:15:03,310
It's always a good idea to that,

365
00:15:03,310 --> 00:15:05,120
'cause of course you can see those TODOs

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00:15:05,120 --> 00:15:07,200
if you want to at a later stage.

367
00:15:07,200 --> 00:15:09,090
Pretty handy, you can see that Android Studio

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00:15:09,090 --> 00:15:10,750
is highlighting them in the blue.

369
00:15:10,750 --> 00:15:11,660
If you want to see your TODOs,

370
00:15:11,660 --> 00:15:12,650
I think I've shown you this before,

371
00:15:12,650 --> 00:15:15,713
click on TODO and you get a list of all the TODOs.

372
00:15:17,476 --> 00:15:19,400
And there's one there from us that we've used previously,

373
00:15:19,400 --> 00:15:20,590
and also this one here,

374
00:15:20,590 --> 00:15:23,120
CursorRecyclerViewAdapter that we're working on now.

375
00:15:23,120 --> 00:15:25,230
Very handy to have that capability.

376
00:15:25,230 --> 00:15:27,440
Alright, I'll close that now.

377
00:15:27,440 --> 00:15:29,160
Basically, a useful way to keep track of code

378
00:15:29,160 --> 00:15:30,660
that you want to come back to,

379
00:15:30,660 --> 00:15:32,560
and it can help to make sure that you don't forget.

380
00:15:32,560 --> 00:15:33,700
We're also getting a warning now,

381
00:15:33,700 --> 00:15:35,210
on the right hand margin.

382
00:15:35,210 --> 00:15:36,910
It's three, in fact, but the first one,

383
00:15:36,910 --> 00:15:39,840
we come back here and look at the first one.

384
00:15:39,840 --> 00:15:41,450
So ignore this first one about removing

385
00:15:41,450 --> 00:15:42,300
the empty class body,

386
00:15:42,300 --> 00:15:43,610
because I talked about that,

387
00:15:43,610 --> 00:15:44,540
but this one here

388
00:15:44,540 --> 00:15:48,290
is telling us that currently CursorRecyclerViewAdapter,

389
00:15:48,290 --> 00:15:50,860
the class itself isn't being used at the moment.

390
00:15:50,860 --> 00:15:53,080
More to the point, is these other ones down here,

391
00:15:53,080 --> 00:15:54,570
we need to deal with these,

392
00:15:54,570 --> 00:15:57,000
which is a warning about hard-coded text,

393
00:15:57,000 --> 00:15:58,320
and obviously that's because we're using

394
00:15:58,320 --> 00:16:02,500
a string literal in the setText function call.

395
00:16:02,500 --> 00:16:03,880
We can get Android Studio to help

396
00:16:03,880 --> 00:16:05,690
in creating a string resources for us,

397
00:16:05,690 --> 00:16:08,134
which is slightly easier than typing the XML into

398
00:16:08,134 --> 00:16:10,450
the string's XML file,

399
00:16:10,450 --> 00:16:12,660
which is of course Res/values file.

400
00:16:12,660 --> 00:16:14,300
I'll do that in the next video,

401
00:16:14,300 --> 00:16:15,660
because it's a bit fiddlier

402
00:16:15,660 --> 00:16:16,850
than you might expect.

403
00:16:16,850 --> 00:16:18,203
See you in the next video.