1 00:00:01,530 --> 00:00:02,040 Welcome back. 2 00:00:02,220 --> 00:00:07,920 And this video we're going to set up the recycler views so that it actually uses the adapter that we 3 00:00:07,920 --> 00:00:08,460 had set up. 4 00:00:08,460 --> 00:00:13,980 So you can see here we have those 12 exercises here at the bottom, even though they will not be highlighted 5 00:00:14,400 --> 00:00:17,100 as the selected one, for example, as of yet. 6 00:00:17,340 --> 00:00:18,990 But we're going to implement that later on. 7 00:00:18,990 --> 00:00:21,630 For now, it's important to just display the risk of you. 8 00:00:21,900 --> 00:00:23,880 OK, so that's what we're going to do in this video. 9 00:00:24,120 --> 00:00:28,440 So let's get back to our project and inside of our exercise activity. 10 00:00:28,440 --> 00:00:36,240 We will need to create an adapter object of our exercise status adapter that we had set up. 11 00:00:36,600 --> 00:00:43,650 OK, so let's do just that private VAR exercise adapter. 12 00:00:43,930 --> 00:00:51,180 OK, and that will be a exercise status adapter object, which will be another bullet for now, and 13 00:00:51,180 --> 00:00:52,650 I'm going to assign all to it. 14 00:00:53,010 --> 00:00:56,910 So this is basically just the adapter that we created in the last video. 15 00:00:57,270 --> 00:01:02,370 It's our own class that we created, and now we can create objects from it, which we just did. 16 00:01:02,730 --> 00:01:07,200 OK, now we can use this adapter to assign to our respective you as an adapter. 17 00:01:07,740 --> 00:01:10,800 OK, so where would be a good spot to do that? 18 00:01:12,250 --> 00:01:17,440 Well, I would say in the create method, but as the create method, there's something that we don't 19 00:01:17,440 --> 00:01:18,530 want to overload. 20 00:01:18,550 --> 00:01:24,340 Let's create a new method which will take care just of this plane, this recital of you at the bottom. 21 00:01:24,610 --> 00:01:29,410 So let's create a private function called set up exercise. 22 00:01:30,670 --> 00:01:32,640 Stead is recycler. 23 00:01:34,070 --> 00:01:34,380 Phew. 24 00:01:34,670 --> 00:01:40,610 OK, so this result of you now will take care of all of the good stuff, which means, first of all, 25 00:01:40,940 --> 00:01:46,010 we will set the respective use layout manager. 26 00:01:46,220 --> 00:01:53,150 OK, so here are the exercise studies dot layout manager. 27 00:01:53,630 --> 00:02:00,230 And this is, by the way, our exercise that is recycler view, which is this item directly inside of 28 00:02:00,230 --> 00:02:01,760 our user interface, OK? 29 00:02:02,390 --> 00:02:06,950 And now we can assign a layout manager property to it. 30 00:02:07,190 --> 00:02:14,150 So the layout manager property allows you to make such changes as whether you want this to be a grid 31 00:02:14,150 --> 00:02:20,300 view where items are positioned like in a grid, or whether you want to position items next to each 32 00:02:20,300 --> 00:02:25,010 other than the layout manager should be a horizontal, linear layout manager. 33 00:02:25,220 --> 00:02:30,860 If you want to put them on top of each other, it would be a vertical linear layout manager and so forth. 34 00:02:31,250 --> 00:02:39,320 So let's use a linear layout manager object here, which needs to have a context, and I'm going to 35 00:02:39,320 --> 00:02:44,480 pass this as the exercise activity should be the context of this layout manager. 36 00:02:44,780 --> 00:02:48,500 And then I can use the different setting. 37 00:02:48,500 --> 00:02:52,410 So you see we have horizontal vertical and invalid offset. 38 00:02:52,440 --> 00:02:57,740 So I want to use horizontal because I want my items to be positioned next to each other. 39 00:02:58,010 --> 00:03:02,670 And then you can say whether it should be displayed in the reverse order. 40 00:03:03,260 --> 00:03:04,970 And I'm going to say false. 41 00:03:05,120 --> 00:03:08,840 So I don't want to have a reverse layout here. 42 00:03:08,960 --> 00:03:09,350 OK. 43 00:03:09,440 --> 00:03:11,880 So set that to false if you don't want it to be reverse. 44 00:03:12,590 --> 00:03:14,720 This is just a linear layout manager. 45 00:03:14,900 --> 00:03:18,800 For example, there are grid layout managers, for example, as well. 46 00:03:18,810 --> 00:03:23,750 So you could, for example, create a grid labeled manager here and check what it requires. 47 00:03:23,780 --> 00:03:24,030 OK. 48 00:03:24,050 --> 00:03:26,840 It requires the context and then disband. 49 00:03:26,840 --> 00:03:30,320 Count the orientation and reverse layout. 50 00:03:30,320 --> 00:03:32,330 So I would use this third option here. 51 00:03:32,540 --> 00:03:39,530 So if you wanted to display it in a grid format, which I don't want to do, I want to use the linear 52 00:03:39,530 --> 00:03:43,580 layout manager, which allows me to put them next to each other, but just to give you an idea of what 53 00:03:43,580 --> 00:03:46,010 you can use as your layout managers. 54 00:03:46,850 --> 00:03:47,200 OK. 55 00:03:47,430 --> 00:03:55,310 And now I need to assign a value to my exercise adapter because I want to assign it as the adapter for 56 00:03:55,310 --> 00:03:56,990 my RV exercise status. 57 00:03:57,320 --> 00:03:59,360 So you always need to do two things for that. 58 00:03:59,870 --> 00:04:03,050 A recycler view that you have as an example. 59 00:04:04,450 --> 00:04:04,920 Widget. 60 00:04:05,090 --> 00:04:11,230 OK, so you need to assign a layout manager and you need to assign what the layout manager property 61 00:04:11,560 --> 00:04:17,649 and you need to assign a value to the adapter property of that right result of you. 62 00:04:18,160 --> 00:04:22,510 And yeah, let's go ahead and prepare the adapter so that we can assign it. 63 00:04:22,810 --> 00:04:29,800 And this will be our exercise status adapter and it needs a list of exercises. 64 00:04:29,800 --> 00:04:33,190 So I'm just going to pass our exercise list at this point. 65 00:04:33,550 --> 00:04:39,790 Now, if I force unwrap it, it's really important that this method set up exercise studies recycler 66 00:04:39,790 --> 00:04:45,070 view will not be called in the create method before we have assigned the exercise list. 67 00:04:45,310 --> 00:04:48,010 So I'm just going to call it at the very bottom here. 68 00:04:48,400 --> 00:04:55,420 Now, of course, the alternative would be to double check if the list isn't empty and only then create 69 00:04:55,420 --> 00:04:56,190 this object. 70 00:04:56,200 --> 00:05:02,710 But by following this structure, where we get that list first and then we call this method, we're 71 00:05:02,710 --> 00:05:03,340 good to go. 72 00:05:03,490 --> 00:05:03,770 OK. 73 00:05:03,790 --> 00:05:05,200 That's why we can focus on it. 74 00:05:05,530 --> 00:05:07,370 But this is something we have to be careful. 75 00:05:07,370 --> 00:05:07,780 Wolf, right? 76 00:05:07,810 --> 00:05:13,180 Just so you're aware this could go wrong if you don't have the right order of your code. 77 00:05:13,810 --> 00:05:21,190 OK, so now I just need to use a my recycler view exercise status. 78 00:05:22,300 --> 00:05:30,430 Adapter, I just need to assign the exercise adapter to the accessories status, race, active use adapter. 79 00:05:31,000 --> 00:05:36,130 OK, so let's just do that exercise adapter, and that will be pretty much it. 80 00:05:36,760 --> 00:05:39,280 So now let's go ahead and test this. 81 00:05:40,700 --> 00:05:44,740 And let's see whether it will display their respect of you. 82 00:05:46,060 --> 00:05:49,690 As we wanted, so not as we wanted, but it displays it. 83 00:05:50,020 --> 00:05:51,310 All right, so there we are, you see? 84 00:05:51,790 --> 00:05:53,270 Get ready for jumping jacks. 85 00:05:53,600 --> 00:05:56,350 And it displays our recycle view here at the bottom. 86 00:05:56,710 --> 00:06:02,440 Now I want it to be centered, and how I can achieve that is by going over to my exercise. 87 00:06:02,440 --> 00:06:08,500 And also let me jump out of it because I don't want to have something in the background and make sure 88 00:06:08,500 --> 00:06:12,820 that the start and end of are the parents. 89 00:06:13,630 --> 00:06:17,590 OK, so here lay out constrained and off and start off. 90 00:06:18,040 --> 00:06:20,740 This will make sure that our item is centered. 91 00:06:21,190 --> 00:06:25,900 So our respect, if you will now be centered, let's rerun it and see if that's actually the case. 92 00:06:26,590 --> 00:06:26,980 So. 93 00:06:28,110 --> 00:06:28,800 Not yet. 94 00:06:28,910 --> 00:06:31,500 OK, let me check what else could be the issue here. 95 00:06:35,000 --> 00:06:40,160 And I believe we could fix it by also just wrapping the content in terms of with. 96 00:06:40,380 --> 00:06:42,170 Okay, that should do the trick. 97 00:06:42,620 --> 00:06:46,700 Because just adding start and end off will not be enough. 98 00:06:47,270 --> 00:06:48,410 And let's see, there we are. 99 00:06:48,560 --> 00:06:54,740 So now of wrapping its content and it's being dragged to the sides, but it's also being pulled to the 100 00:06:54,740 --> 00:06:55,340 bottom. 101 00:06:55,730 --> 00:06:59,260 And it has while it is underneath our jumping jacks. 102 00:06:59,270 --> 00:07:04,580 So that's pretty much what I wanted to have in terms of the respect of you behavior. 103 00:07:06,670 --> 00:07:08,740 OK, so let's summarize what's going on here. 104 00:07:09,100 --> 00:07:16,370 So we have this recycle view here at the bottom, which is basically just this recycling of you Exim 105 00:07:16,420 --> 00:07:17,410 L widget. 106 00:07:17,530 --> 00:07:21,420 OK, so at the very bottom of our activity exercise, we have this widget. 107 00:07:21,440 --> 00:07:27,100 OK, this recycle of you and the recycle view needs to know how items are positioned, so it needs to 108 00:07:27,100 --> 00:07:30,080 know about the linear or the layout manager. 109 00:07:30,080 --> 00:07:33,910 It doesn't have to be a linear layout manager, but that's what we are using because we want to put 110 00:07:33,910 --> 00:07:35,980 items next to each other. 111 00:07:35,980 --> 00:07:39,580 As you can see here, they are not on top of each other, but next to each other. 112 00:07:40,090 --> 00:07:41,650 And it needs an adapter. 113 00:07:41,890 --> 00:07:48,430 So we created this linear layout manager here in order to assign it. 114 00:07:48,490 --> 00:07:51,640 So this one, in order to assign it to our of you. 115 00:07:52,000 --> 00:07:58,060 And then we need to create an adapter in order to assign it to the adapter property of the recycle view. 116 00:07:58,270 --> 00:08:00,790 OK, so this recycler view needs to have an adapter. 117 00:08:00,910 --> 00:08:05,650 And now, in order to assign an adapter, we of course need to prepare an adapter, which is what we 118 00:08:05,650 --> 00:08:05,920 did. 119 00:08:06,100 --> 00:08:11,650 So we created this adapter, which needs to have an array list or a list in general, doesn't have to 120 00:08:11,650 --> 00:08:12,240 be realistic. 121 00:08:12,250 --> 00:08:17,020 It could be another type of list, but it needs to have a list of items that it's supposed to display. 122 00:08:17,260 --> 00:08:23,710 And in our case, it's going to be in a list of exercise model items so which are just our exercises, 123 00:08:23,740 --> 00:08:26,860 like every single exercise, has an ID and name and so forth. 124 00:08:27,430 --> 00:08:33,669 And now we are just saying that our adapter should inherit from recycled view adapter. 125 00:08:33,730 --> 00:08:35,900 And here we're passing our own view holder. 126 00:08:36,130 --> 00:08:42,159 So we're saying use the view holder from the exercise status adapter for your type. 127 00:08:42,159 --> 00:08:48,580 So we're saying, OK, we create our own view holder class inside of our exercise status adapter class 128 00:08:48,910 --> 00:08:54,190 and we pass in our binding object, which is the item exercise that is binding. 129 00:08:54,580 --> 00:09:02,980 And then we can also use the binding in order to use the Recycler View View holder, which is just a 130 00:09:02,980 --> 00:09:03,790 normal view holder. 131 00:09:03,790 --> 00:09:10,390 And we pass our binding route, which means we're passing our recycler view by item itself. 132 00:09:10,720 --> 00:09:11,150 OK. 133 00:09:11,440 --> 00:09:18,310 And then we can now access its items so we can access the text view item, which is this item exercise 134 00:09:18,520 --> 00:09:22,120 status, which is this text view item. 135 00:09:22,150 --> 00:09:27,340 OK, so this text view that we created an extra example file for item exercise status. 136 00:09:27,610 --> 00:09:30,220 So this is how an individual item should look like. 137 00:09:30,970 --> 00:09:37,210 So now we have to implement those three methods to get item count is the one. 138 00:09:37,210 --> 00:09:41,500 Where would you say, how many items do we have inside of this item's proper? 139 00:09:41,880 --> 00:09:49,180 The array lists or how many different elements are or exercises are inside of this list of exercises? 140 00:09:49,810 --> 00:09:54,580 Then we say what we want to do for every single binding of a view holder. 141 00:09:54,580 --> 00:10:02,860 So for every single one of those little circles, and what we're saying is just assigned the idea of 142 00:10:02,860 --> 00:10:07,270 the number of the exercise to the circle. 143 00:10:07,690 --> 00:10:13,300 So to the text of the circle, to be more precise, because this TV item has a text property that we're 144 00:10:13,300 --> 00:10:14,320 now overwriting. 145 00:10:14,370 --> 00:10:21,250 OK, so we're setting the text of this TV item where we are while binding it, in our view, all before, 146 00:10:21,250 --> 00:10:21,580 right? 147 00:10:21,850 --> 00:10:24,020 We're just assigning our ID to it. 148 00:10:24,490 --> 00:10:29,380 Of the model, which is our exercise model, which is basically our exercise. 149 00:10:29,920 --> 00:10:35,860 OK, and now we're just assigning it here and in the concrete view holder there, we need to return 150 00:10:35,860 --> 00:10:37,960 our own view, hold that we just created. 151 00:10:37,990 --> 00:10:40,000 At least that's our approach to it. 152 00:10:40,180 --> 00:10:44,450 And we are passing something of type binding to the view holder. 153 00:10:44,530 --> 00:10:47,320 What is the binding that we're passing, where the binding object is? 154 00:10:47,320 --> 00:10:53,620 Our item exercise status binding, which we get through using view binding and we inflate. 155 00:10:54,770 --> 00:11:01,370 And therefore, we need to pass in a layout inflator, and we get that from the parents context, so 156 00:11:01,370 --> 00:11:07,910 the parent is the view group and then we need to pass in the view group itself, as well as say, whether 157 00:11:07,910 --> 00:11:09,710 we want to attach it to the parent or not. 158 00:11:10,460 --> 00:11:11,330 OK, and now. 159 00:11:12,400 --> 00:11:18,730 At this point, we can assign this adapter that we've just created to our recycling of you. 160 00:11:19,150 --> 00:11:26,620 So we do that inside of our exercise activity, so set up exercise studies, which give you is how I 161 00:11:26,980 --> 00:11:33,400 called the function and to me, call it correctly and the recycler view like so. 162 00:11:34,290 --> 00:11:42,870 So I had a typo in there, and now this will basically do the trick of assigning everything, setting 163 00:11:42,870 --> 00:11:49,500 the layout that we wanted in our case that items are positioned horizontally, which you can see here 164 00:11:49,500 --> 00:11:50,010 clearly. 165 00:11:50,940 --> 00:11:51,380 OK. 166 00:11:51,420 --> 00:11:56,520 So that's it for this video and the next one, we're going to see how we can display at which exercise 167 00:11:56,520 --> 00:12:02,940 we currently are because you see, I'm at high knees running in place, which is we could check that 168 00:12:02,940 --> 00:12:03,310 out. 169 00:12:03,850 --> 00:12:05,100 Um, no. 170 00:12:06,060 --> 00:12:07,200 Or is it triceps? 171 00:12:07,530 --> 00:12:08,640 It's number nine. 172 00:12:09,390 --> 00:12:14,580 So I would like to make sure that nine is going to have a different background. 173 00:12:14,700 --> 00:12:15,960 So see you in the next video.