1 00:00:00,800 --> 00:00:06,560 Welcome back and this video, we are going to add the functionality for the BMI calculator and for now 2 00:00:06,560 --> 00:00:08,780 just one for the metric system. 3 00:00:08,780 --> 00:00:16,340 So you can see once I click on it, this window pops up so I can enter the weight and I weigh six to 4 00:00:16,340 --> 00:00:21,460 nine kilos and then the height in centimeters and I'm on sixty nine and then we can calculate it. 5 00:00:21,460 --> 00:00:24,050 Then you can see your BMI, so on, so normal. 6 00:00:24,050 --> 00:00:24,860 Congratulations. 7 00:00:24,860 --> 00:00:25,630 You're in good shape. 8 00:00:26,090 --> 00:00:26,510 All right. 9 00:00:26,540 --> 00:00:28,250 And that's what we're going to build this video. 10 00:00:28,260 --> 00:00:30,650 And of course you can go ahead and try to build that yourself. 11 00:00:30,890 --> 00:00:38,180 What you will need to have is of course the formula for BMI and which values mean what. 12 00:00:38,450 --> 00:00:43,280 But if you build everything else except for this specific functionality, then it's going to be fine 13 00:00:43,280 --> 00:00:44,360 already as well. 14 00:00:44,360 --> 00:00:51,380 You can, of course, Google how to calculate the BMI and what the different metrics are there and try 15 00:00:51,380 --> 00:00:52,910 to build everything yourself. 16 00:00:52,910 --> 00:00:55,030 But otherwise you can, of course, follow along. 17 00:00:55,250 --> 00:00:57,290 I still think that is a great exercise. 18 00:00:57,470 --> 00:01:00,800 So if you want to challenge yourself, please go ahead and build that. 19 00:01:01,370 --> 00:01:01,730 All right. 20 00:01:01,730 --> 00:01:04,069 Let's go ahead and build that UI first. 21 00:01:04,069 --> 00:01:08,880 So that's something that we, of course, need to do in our BMI X amount. 22 00:01:09,050 --> 00:01:16,160 So here activity underscore BMI, XML, and here I'm going to put that underneath my toolbar and I'm 23 00:01:16,160 --> 00:01:23,660 going to use a linear layout here so you can see we have a relative layout as the surrounding container, 24 00:01:23,660 --> 00:01:24,380 so to speak. 25 00:01:24,380 --> 00:01:29,870 And then inside of that, I have a linear layout and there is a lot going on there. 26 00:01:29,870 --> 00:01:36,740 So I'm just going to paste it in here and then I'm going to go through it because this is a lot of text 27 00:01:36,740 --> 00:01:38,690 that we need to use here. 28 00:01:39,360 --> 00:01:44,690 And when pasting the activity in here, you might get this problem here. 29 00:01:44,700 --> 00:01:50,780 This little arrow, it says, cannot resolve come that ad, so forth. 30 00:01:50,780 --> 00:01:57,410 And what we need to do is we need to use this comma, Google, that Android, the material, and add 31 00:01:57,410 --> 00:01:58,670 that to our build cradle. 32 00:01:58,680 --> 00:02:00,480 So the module app. 33 00:02:00,650 --> 00:02:04,760 So this one, we need to add a dependency in here. 34 00:02:05,180 --> 00:02:07,190 So implementation. 35 00:02:09,210 --> 00:02:15,690 And then apostrophe Google material and here colon material. 36 00:02:17,340 --> 00:02:18,000 Kolan. 37 00:02:19,230 --> 00:02:20,820 1.0 dot zero. 38 00:02:22,160 --> 00:02:27,250 All right, and then you need to sync it, and by the way, this is within the dependancy, so built 39 00:02:27,260 --> 00:02:29,650 a cradle and the app one. 40 00:02:29,660 --> 00:02:31,970 So there are two, as you can see, the project one at the app one. 41 00:02:32,210 --> 00:02:35,890 So the app one, you need to add that under dependency. 42 00:02:35,900 --> 00:02:37,820 So this line here implementation. 43 00:02:38,210 --> 00:02:43,290 Cool, that android, that material and then sync now and then you will be able to use it. 44 00:02:43,670 --> 00:02:47,150 This is something that is the case because we are only using empty activities. 45 00:02:47,150 --> 00:02:53,180 If we were using blank activities, then that would be a different story because then our basic activities, 46 00:02:53,390 --> 00:02:55,840 then this would be there automatically. 47 00:02:56,540 --> 00:03:01,550 OK, but now coming back to this line here, you can see now it's not a. 48 00:03:02,400 --> 00:03:03,420 Complaining anymore. 49 00:03:03,720 --> 00:03:09,060 So what we have is a linear layout, and I called this one the units view that's matching the parent, 50 00:03:09,070 --> 00:03:13,650 so it's taking the whole with height and it is underneath our toolbar. 51 00:03:14,430 --> 00:03:15,230 This one here. 52 00:03:15,450 --> 00:03:17,790 So our toolbar, BMI activity. 53 00:03:18,990 --> 00:03:19,830 Because we are. 54 00:03:25,280 --> 00:03:31,490 In a relative layout, and then we set the orientation to vertical, we have a little padding, and 55 00:03:31,490 --> 00:03:37,880 then I have this text input layout which has an idea I call the telemetric unit wait. 56 00:03:38,340 --> 00:03:42,500 Then we set a particular style and I set the style to outline box. 57 00:03:42,500 --> 00:03:46,570 But that allows us to do is to have this pretty cool style that you can see here. 58 00:03:46,580 --> 00:03:54,590 So we have this outline box and once I click on it, you can see now the hint or the predefined text 59 00:03:54,590 --> 00:03:57,420 goes up towards this line here. 60 00:03:57,440 --> 00:03:59,450 So this is a pretty cool interaction. 61 00:03:59,450 --> 00:04:04,470 And you get that by adding this text input layout and adding this particular style here. 62 00:04:04,940 --> 00:04:08,860 So I'm saying the width should match parent that the height should only be as much as required. 63 00:04:09,260 --> 00:04:12,500 And then in there I have this compact added text. 64 00:04:12,500 --> 00:04:15,460 So that's just the latest version of an edit text. 65 00:04:15,500 --> 00:04:20,329 I called it metric unit height weight and then match parent in with. 66 00:04:20,329 --> 00:04:26,150 So take the all with only as high as you require and then the hint should be weight in kilograms. 67 00:04:26,150 --> 00:04:31,160 So you can see that this is the hint that you can see here, which is pretty cool, and that's also 68 00:04:31,160 --> 00:04:32,780 what will be pushed towards the top. 69 00:04:32,780 --> 00:04:34,340 So that's something you can play around with. 70 00:04:34,340 --> 00:04:37,250 This value here will change what people will see there. 71 00:04:37,660 --> 00:04:39,970 Then the input type should be no decimal. 72 00:04:39,980 --> 00:04:45,890 So if you do that, then this keyboard comes up where you only can enter decimal values. 73 00:04:45,890 --> 00:04:51,080 You cannot enter any alphabetic values, but really just numeric once. 74 00:04:51,350 --> 00:04:53,570 And that's what we get with no decimal. 75 00:04:54,250 --> 00:04:56,510 All right, textiles, the 16 S.P.. 76 00:04:56,840 --> 00:04:59,420 And then I have another text input layout, the same thing. 77 00:04:59,420 --> 00:05:06,180 I called this one till unit height and then it uses the same style. 78 00:05:06,200 --> 00:05:12,560 So this outline box style, all the values are the same except for the ID here. 79 00:05:12,560 --> 00:05:15,320 And a hint now is height in centimeters. 80 00:05:15,950 --> 00:05:24,080 OK, underneath it I have this a linear layout which is the display BMI result layouts or display BMI 81 00:05:24,080 --> 00:05:24,560 result. 82 00:05:24,920 --> 00:05:29,960 It should match parent in terms of with but it should prep its content in terms of height. 83 00:05:30,740 --> 00:05:32,510 Emergen top should be twenty five. 84 00:05:32,510 --> 00:05:35,270 So a little distance towards top vertical again. 85 00:05:35,270 --> 00:05:37,380 So stuff is put on top of each other. 86 00:05:37,400 --> 00:05:43,610 Visibility is such a visible so you might guess it's already we will change the visibility. 87 00:05:44,700 --> 00:05:48,270 We even said Tool's visibility too visible, so this is just for. 88 00:05:49,650 --> 00:05:56,610 Debugging and developing purposes, then we have this text you and another text to you and to more text 89 00:05:56,630 --> 00:05:56,840 use. 90 00:05:56,890 --> 00:06:00,060 And if we have this button, so let's look at those four text views. 91 00:06:00,300 --> 00:06:02,100 One is called TV, your BMI. 92 00:06:02,850 --> 00:06:07,800 Again, Metropia and Web content, growthy centered text this your BMI text. 93 00:06:07,800 --> 00:06:09,060 All CEPS is such a true. 94 00:06:09,070 --> 00:06:11,220 So all the text will be in capital letters. 95 00:06:11,550 --> 00:06:16,260 Visibility is said to invisible and then we have the text size to 16. 96 00:06:17,010 --> 00:06:18,700 Now the same thing for this one. 97 00:06:18,720 --> 00:06:25,410 So here the BMI value is said to match parent content. 98 00:06:25,410 --> 00:06:29,180 Margin is five density pixels with a little gravity. 99 00:06:29,430 --> 00:06:37,500 We have some text US settings here and the text itself in the tools just says 15, even though we're 100 00:06:37,500 --> 00:06:38,520 not using it like that. 101 00:06:38,550 --> 00:06:41,260 So Tool's is here what we can see here. 102 00:06:41,280 --> 00:06:43,240 So just did we see anything in there? 103 00:06:43,260 --> 00:06:43,590 Right. 104 00:06:43,870 --> 00:06:47,670 So basically these are the four text fields that I have there. 105 00:06:47,970 --> 00:06:53,730 And I want to let the user later know what his actual BMI is. 106 00:06:53,730 --> 00:06:56,880 And these are the four text fields or text views which do that. 107 00:06:57,310 --> 00:07:01,260 OK, so we have this text you, which is the TV, BMI type. 108 00:07:02,910 --> 00:07:11,250 And it's set centered to Texas normal, so are you overweight or are you normal, are you on the way 109 00:07:11,250 --> 00:07:12,030 to those kind of things? 110 00:07:12,040 --> 00:07:17,550 So this is going to be this text view and then the final text, you can see a little description. 111 00:07:17,560 --> 00:07:18,680 So are you fit? 112 00:07:18,690 --> 00:07:20,900 Are you healthy, in danger? 113 00:07:20,910 --> 00:07:25,990 So, you know, you need to really take care of your health and lose some weight or gain some weight. 114 00:07:26,010 --> 00:07:31,020 So this is the kind of text that will be instead of this text, you and then on the need that we have 115 00:07:31,020 --> 00:07:39,330 this button, which is called button calculate units, and it's going to be gravitating towards the 116 00:07:39,330 --> 00:07:39,840 bottom. 117 00:07:40,020 --> 00:07:42,950 The margin will be set to thirty five density pixels. 118 00:07:43,470 --> 00:07:47,370 We have a little background color here, which is our green background color. 119 00:07:47,370 --> 00:07:50,250 So it's basically this calculate button here. 120 00:07:51,500 --> 00:07:54,140 And then the next caller is said to White. 121 00:07:56,340 --> 00:07:58,540 All right, so that's the UI. 122 00:07:58,590 --> 00:08:01,490 Now let's go into the cutline coat. 123 00:08:01,800 --> 00:08:04,610 So here I'm going to create a new function. 124 00:08:04,620 --> 00:08:14,850 So inside of RBM I activity, I create this private function, private fun called validate metric units, 125 00:08:15,600 --> 00:08:18,210 and it's going to return a boolean. 126 00:08:18,660 --> 00:08:23,850 So the idea is that we want to check that the user enter something, correct or not. 127 00:08:24,150 --> 00:08:29,390 So I'm going to create a variable called is valid and I'm going to set that to true. 128 00:08:29,790 --> 00:08:38,370 So expecting that the entries that the user entered are true or are correct and valid and then I'm going 129 00:08:38,370 --> 00:08:39,700 to return is valid. 130 00:08:40,080 --> 00:08:43,830 Now, of course, I need to set Isabelita false at one point if it is false. 131 00:08:43,840 --> 00:08:48,990 So I'm going to say if the heat metric. 132 00:08:50,690 --> 00:08:51,500 United. 133 00:08:52,990 --> 00:08:58,090 And wait, so those two, I think it was the top one, so let's start with this one, the tech start 134 00:08:58,330 --> 00:09:01,070 to string is empty. 135 00:09:02,230 --> 00:09:06,700 So if it is empty, then said is valid. 136 00:09:08,050 --> 00:09:10,630 To false and else. 137 00:09:12,480 --> 00:09:13,950 If the. 138 00:09:14,850 --> 00:09:16,980 IT metric unit. 139 00:09:18,110 --> 00:09:20,930 Height in this case has. 140 00:09:22,480 --> 00:09:24,670 The same story, so text to string. 141 00:09:27,160 --> 00:09:33,850 Is empty, then also said is valid to false, so I guess I'm just checking. 142 00:09:34,240 --> 00:09:35,850 Is any of the two fields empty? 143 00:09:35,950 --> 00:09:41,200 Because if one of the two fields is empty, then I don't want the calculation to do anything. 144 00:09:41,210 --> 00:09:42,730 So the buttons shouldn't do anything. 145 00:09:42,750 --> 00:09:49,160 Or maybe we should inform the user about having to enter a valid entry in both fields. 146 00:09:49,840 --> 00:09:50,310 All right. 147 00:09:50,440 --> 00:09:57,100 The next thing we need to do is we need to add an on click listener for this calculate button. 148 00:09:58,450 --> 00:10:07,060 So in order to do so, we're going to go into our uncreate here because that's where we handle our unscrupulousness 149 00:10:07,420 --> 00:10:10,080 for our buttons on the highest level. 150 00:10:10,540 --> 00:10:13,690 And I'm going to say button calculate units. 151 00:10:13,690 --> 00:10:19,030 And that's, by the way, this button here calculate units to one at the very bottom. 152 00:10:19,060 --> 00:10:21,130 Of course, if that one is pressed. 153 00:10:21,130 --> 00:10:22,660 So set on Click Listener. 154 00:10:25,960 --> 00:10:33,250 Then I first want to check if the entries are correct, so if the user entered something useful, so 155 00:10:33,250 --> 00:10:39,690 in both fields there is a value in there and then I will store the highest value. 156 00:10:39,940 --> 00:10:42,100 So value, height, value. 157 00:10:43,380 --> 00:10:51,870 Here, height value is going to be of type float, and I'm going to say it's going to be metric height. 158 00:10:52,850 --> 00:10:53,660 Thought text. 159 00:10:56,220 --> 00:10:57,270 The two string. 160 00:10:59,460 --> 00:11:01,900 And then transform that into a float. 161 00:11:02,220 --> 00:11:03,160 Why can I do that? 162 00:11:03,630 --> 00:11:09,420 Well, I can do that because the entry itself can only be a number here, as you can see. 163 00:11:09,540 --> 00:11:11,640 OK, so now I can. 164 00:11:13,160 --> 00:11:16,400 Transform that or convert that string into a float. 165 00:11:17,060 --> 00:11:23,570 Now, here's what I also want to do, is I want to convert that into meters, so I'm going to divide 166 00:11:23,570 --> 00:11:25,130 that by one hundred. 167 00:11:26,700 --> 00:11:27,240 And then. 168 00:11:29,140 --> 00:11:39,220 I also need to have a value for the weight, so weight value is also going to be a floating value and 169 00:11:39,220 --> 00:11:41,620 it's going to use it metric. 170 00:11:42,920 --> 00:11:45,950 Wait, the text to string. 171 00:11:47,430 --> 00:11:48,090 To float. 172 00:11:49,330 --> 00:11:54,490 And here, I don't need to calculate through anything or divide by anything, and then we can calculate 173 00:11:54,520 --> 00:11:55,030 the BMI. 174 00:11:55,030 --> 00:11:56,920 So the BMI is very basic. 175 00:11:56,920 --> 00:12:00,340 It's just a weight divided by the height squared. 176 00:12:00,580 --> 00:12:07,060 So while BMI is equal to weight value, divided by. 177 00:12:08,640 --> 00:12:10,560 Heights multiplied with height. 178 00:12:13,500 --> 00:12:22,050 That's it, and now we can go ahead and display the BMI results about in order to do so, we need to. 179 00:12:23,390 --> 00:12:28,410 Create another function, because I don't want to do all of that code inside of our BMI activity. 180 00:12:29,000 --> 00:12:29,960 I would be too much. 181 00:12:29,990 --> 00:12:31,760 So let's create another method here. 182 00:12:32,670 --> 00:12:37,980 Which I'm going to call this place of private fund display. 183 00:12:38,990 --> 00:12:40,460 The result? 184 00:12:43,330 --> 00:12:48,190 And of course, it needs to have a float in here, so I'm going to call this one BMI, which is of type 185 00:12:48,190 --> 00:12:52,150 float, and then in here I need a label. 186 00:12:52,450 --> 00:13:02,560 So Volle will be am I a label which is going to be of type strength and a value which will be the BMI 187 00:13:02,560 --> 00:13:03,610 description. 188 00:13:04,730 --> 00:13:10,470 Also of type strength, and then what I will need is the comparison. 189 00:13:10,610 --> 00:13:15,110 So the thing is, I'm going to paste it in here because it's a lot of very. 190 00:13:15,980 --> 00:13:19,760 Boring, but let's look at it, so it's always comparing. 191 00:13:19,790 --> 00:13:23,480 So if this is a comparison and it goes all the way down there. 192 00:13:24,500 --> 00:13:27,920 OK, so I'm checking to be BMI. 193 00:13:28,870 --> 00:13:32,020 Compared to 15, less than zero. 194 00:13:34,060 --> 00:13:35,120 Or equals zero. 195 00:13:35,560 --> 00:13:43,030 So what does compared to the competitors value with the specified value for order return zero if this 196 00:13:43,030 --> 00:13:47,050 value is equal to the specified other value, a negative number? 197 00:13:49,810 --> 00:13:51,670 If it's less than the other. 198 00:13:52,700 --> 00:13:59,810 Or a positive number if it's greater than other, so we're comparing two values to each other, so we're 199 00:13:59,810 --> 00:14:01,100 comparing BMI now. 200 00:14:01,100 --> 00:14:04,990 So the value that was passed to us, we're comparing that to 15. 201 00:14:05,240 --> 00:14:10,790 If that's the case, it's going to set BMI level to very severely underweight BMI description will be 202 00:14:10,790 --> 00:14:11,010 obese. 203 00:14:11,060 --> 00:14:15,650 You really need to take better care of yourself, eat more, and then we compare it. 204 00:14:16,250 --> 00:14:18,200 Is it between 15 and 16? 205 00:14:18,200 --> 00:14:20,350 So that's what this code here does. 206 00:14:20,630 --> 00:14:24,560 And if that's the case, then we're going to ride severely underweight. 207 00:14:25,070 --> 00:14:27,810 Oops, you really need to take care of each other or of yourself. 208 00:14:28,040 --> 00:14:29,300 So the text is the same. 209 00:14:29,450 --> 00:14:33,320 But we are also, of course, going to write the BMI to him as well. 210 00:14:34,810 --> 00:14:40,000 But as you can see, the BMI label is actually changing, so this description is the same what the BMI 211 00:14:40,000 --> 00:14:41,140 label is a little different. 212 00:14:41,260 --> 00:14:45,030 I can't then we check is it between 16 and eighteen point five? 213 00:14:45,580 --> 00:14:48,580 If that's the case, then you are still underweight. 214 00:14:48,910 --> 00:14:54,190 Is it between eighteen point five and 25, then you are in a normal shape. 215 00:14:54,200 --> 00:14:55,630 Congratulations. 216 00:14:55,630 --> 00:14:56,680 You are in a normal shape. 217 00:14:57,070 --> 00:14:57,760 And then. 218 00:14:58,930 --> 00:15:02,560 We have between 25 and 30, then you're overweight. 219 00:15:04,070 --> 00:15:12,440 Between 30 and 20 or 35 here, you can see the Europese plus one moderately obese, oops, you really 220 00:15:12,440 --> 00:15:15,640 need to take care of yourself, work out more or maybe. 221 00:15:16,070 --> 00:15:18,170 And then we have this other statement here. 222 00:15:19,390 --> 00:15:27,000 Where we compare it, 35 to 40, so is it between 35 and 40 your BMI, then you are obese, class, 223 00:15:27,010 --> 00:15:29,030 too severely obese. 224 00:15:29,050 --> 00:15:36,790 And then if none of the beforehand is true, then you are severely or obese. 225 00:15:36,790 --> 00:15:44,110 Class three, very severely obese, and then you really need to act because that's it's really time. 226 00:15:44,140 --> 00:15:47,050 OK, so that's basically the whole thing here. 227 00:15:47,050 --> 00:15:48,740 You see, it's rather boring. 228 00:15:48,760 --> 00:15:54,180 So I hope you're full of forgive me for not entering everything or typing everything. 229 00:15:54,730 --> 00:16:01,150 So then the next thing that I want to do is I want to make all of those text fields visible, because 230 00:16:01,150 --> 00:16:02,830 if you look at the text fields again. 231 00:16:03,460 --> 00:16:04,180 So here. 232 00:16:05,680 --> 00:16:13,150 The text views actually the whole linear layout visibility is set to visible, but the text you hear 233 00:16:13,150 --> 00:16:14,290 is invisible. 234 00:16:15,280 --> 00:16:18,040 And actually, let me check the other text fields. 235 00:16:19,430 --> 00:16:21,660 They are set to visible, but they are never used. 236 00:16:22,490 --> 00:16:22,910 So. 237 00:16:23,830 --> 00:16:30,550 What we can do is we can make sure that they all are set to be invisible and we do that with these lines 238 00:16:30,550 --> 00:16:34,660 of code here and we need to import you in order to use this code. 239 00:16:34,660 --> 00:16:42,370 So you can see I'm using TV, your BMI visibility to visible BMI value to visible BMI type to visible 240 00:16:42,370 --> 00:16:45,010 and BMI description to visible. 241 00:16:46,340 --> 00:16:49,640 All right, now, the next thing I do is I calculate the BMI or. 242 00:16:52,380 --> 00:17:01,380 Now, the next thing I do is I round, so I have to tell you, BMI value, which takes in the BMI here 243 00:17:01,890 --> 00:17:03,270 and makes it a big decimal. 244 00:17:03,390 --> 00:17:10,829 So what that does is it is used to round the result value to two decimals after the decimal point. 245 00:17:11,040 --> 00:17:19,260 OK, so I'm setting the scale to two and I'm using the rounding mode how even and I make a string out 246 00:17:19,260 --> 00:17:19,440 of it. 247 00:17:19,450 --> 00:17:21,890 So this is what this line of code does. 248 00:17:21,900 --> 00:17:24,470 It looks complicated, but that's basically what it does. 249 00:17:24,810 --> 00:17:31,380 So big decimal, say, a decimal hour of the or takes our big decimal, then brings it into the right 250 00:17:31,380 --> 00:17:37,590 format, as we do here with setting the scale and rounding it and then making a string out of the whole 251 00:17:37,590 --> 00:17:37,980 thing. 252 00:17:38,490 --> 00:17:38,910 All right. 253 00:17:38,910 --> 00:17:44,100 And then the next thing is we need to set our text so we have multiple text. 254 00:17:44,100 --> 00:17:44,340 Right. 255 00:17:44,340 --> 00:17:49,260 So we have, for example, the TV, BMI value. 256 00:17:49,920 --> 00:17:53,610 We can set the text to be the BMI value. 257 00:17:54,390 --> 00:17:56,520 So we create this additional variable here. 258 00:17:57,390 --> 00:17:58,110 This one here. 259 00:17:58,990 --> 00:18:07,410 Then we have the other variables, which we haven't set yet, so I type the text should be said to be 260 00:18:07,430 --> 00:18:08,050 my label. 261 00:18:09,690 --> 00:18:16,930 And the TV, BMI description should be said to the BMI description. 262 00:18:17,250 --> 00:18:19,890 So at this point, you can see this code is not gray anymore. 263 00:18:19,890 --> 00:18:20,540 It's white now. 264 00:18:20,550 --> 00:18:22,660 So we are using it now. 265 00:18:23,310 --> 00:18:23,820 All right. 266 00:18:26,430 --> 00:18:34,650 Already, so now there's one less thing left to do, and that is to actually ever call this function 267 00:18:34,950 --> 00:18:39,350 that we just created, this display PMI result, and that is in here. 268 00:18:39,360 --> 00:18:45,560 So we pass in the BMI, which we just calculated based on the height and weight. 269 00:18:46,260 --> 00:18:51,420 And by the way, if the user didn't enter anything useful, then I'm just going to. 270 00:18:53,530 --> 00:19:01,060 Prayers and a toast here saying, please enter Veliz values and the length of the toast is short and 271 00:19:01,060 --> 00:19:03,520 then it should show this toast. 272 00:19:05,410 --> 00:19:12,760 All right, so this is the coat that we need in order to test it, so let's test it on our emulator. 273 00:19:14,850 --> 00:19:19,770 There we are, so BMI calculator, we can see Texas looking good. 274 00:19:20,010 --> 00:19:28,230 Let's set the weight now again to 69, the height to 169 and calculate and you can see your BMI twenty 275 00:19:28,230 --> 00:19:30,750 four point one six a.m. congratulations. 276 00:19:30,750 --> 00:19:31,560 You are in good shape. 277 00:19:31,770 --> 00:19:39,740 So you can see that here, twenty four point one six is what was created by this line here. 278 00:19:40,560 --> 00:19:47,250 So where we scale it to two, we rounded it off evenly and. 279 00:19:48,240 --> 00:19:52,350 That's pretty much it, because the calculation itself probably returns a different value. 280 00:19:53,940 --> 00:19:58,350 So I entered it in a calculator, and as you can see, this is the value that I get twenty four point 281 00:19:58,350 --> 00:20:00,780 one five eight eight, eight and so forth, super long value. 282 00:20:01,120 --> 00:20:02,910 That's not what you want to display to the user. 283 00:20:03,180 --> 00:20:08,460 You should always limited to a much shorter number that is still useful to the user. 284 00:20:09,120 --> 00:20:11,400 OK, so that's it for now. 285 00:20:12,320 --> 00:20:19,510 In the next two videos, we are going to do the same thing for the BMI calculation, for the US system, 286 00:20:19,520 --> 00:20:25,760 so with inches and pounds and all those kind of things, and we will, first of all, prepare that and 287 00:20:25,760 --> 00:20:27,530 then afterwards we will finalize it. 288 00:20:27,530 --> 00:20:30,020 So we're going to require two videos for that. 289 00:20:30,140 --> 00:20:31,400 So see you in the next video.