1 00:00:01,010 --> 00:00:08,420 Welcome back in this video, we're going to implement calculating the BMI using US units, which means 2 00:00:08,420 --> 00:00:11,010 we will need to use a different formula. 3 00:00:11,030 --> 00:00:16,219 You see a dividing weight in pounds by height in inches squared. 4 00:00:16,370 --> 00:00:19,910 Multiplying by conversion factor of 703. 5 00:00:20,660 --> 00:00:24,200 So yeah, it's quite complex. 6 00:00:24,740 --> 00:00:28,370 The metric system makes it a lot easier, but let's just implement that. 7 00:00:28,370 --> 00:00:32,930 You can try to do this yourself, of course, but basically speaking, you need to get the data first. 8 00:00:32,930 --> 00:00:36,020 You need to validate whether those added text are empty or not. 9 00:00:36,020 --> 00:00:39,170 If they're not empty, then do the calculation at then displays. 10 00:00:40,100 --> 00:00:46,390 OK, so let's go over to our code, and something that would be very easy will be to validate. 11 00:00:46,400 --> 00:00:51,380 Basically, we need to do the same thing as we did here, but with the other added texts or with three 12 00:00:51,380 --> 00:00:55,100 added texts now instead of just two added texts. 13 00:00:55,640 --> 00:00:59,630 OK, so I'm just going to paste it in here and go over it really quickly. 14 00:00:59,630 --> 00:01:01,760 So I'm validating the U.S. units now. 15 00:01:01,760 --> 00:01:05,360 This is a new method I'm going to set is valid to true by default. 16 00:01:05,660 --> 00:01:08,540 Then I'm using this one statement. 17 00:01:08,750 --> 00:01:15,170 When this added text metric unit weight, which is this one here at the top is empty or this one is 18 00:01:15,170 --> 00:01:16,760 empty or this one is empty. 19 00:01:17,060 --> 00:01:23,270 In either case, I'm going to set is valid to false and I'm going to return is valid. 20 00:01:23,330 --> 00:01:25,640 So it's going to be true by default. 21 00:01:25,640 --> 00:01:29,840 But then, depending on whether one of them is empty, we're going to overwrite it. 22 00:01:30,920 --> 00:01:35,120 OK, so now we need to do the calculations. 23 00:01:36,230 --> 00:01:43,700 So let's go ahead and create this new function that I'm going to call calculate units. 24 00:01:44,900 --> 00:01:49,580 And first, I need to check which view is current divisible. 25 00:01:49,580 --> 00:01:56,990 So if it's the matrix view, I just want to do the code that we did once we clicked on the button, 26 00:01:56,990 --> 00:01:57,420 I believe. 27 00:01:57,440 --> 00:01:58,100 Let me check. 28 00:01:58,520 --> 00:02:02,480 So we have this, yes on click if! 29 00:02:02,480 --> 00:02:04,990 Validate metric units here. 30 00:02:05,000 --> 00:02:06,200 That's what we're doing. 31 00:02:06,350 --> 00:02:12,620 OK, so let me take all of that and put it into this method. 32 00:02:13,670 --> 00:02:14,900 Well, we calculate. 33 00:02:16,970 --> 00:02:21,440 The units I would calculate BMI, basically. 34 00:02:22,820 --> 00:02:30,650 OK, so we validate if the metric units is true or not, and only then are we setting up all of those 35 00:02:31,100 --> 00:02:32,000 values, right? 36 00:02:32,000 --> 00:02:35,190 And then we calculate the BMI and we display the BMI result. 37 00:02:35,210 --> 00:02:38,960 Otherwise, we're displaying that there is nothing to see. 38 00:02:39,380 --> 00:02:40,880 OK, so that's one thing. 39 00:02:41,180 --> 00:02:46,820 But then if we are in the other view, which means we are not in the metrics units view, but in the 40 00:02:46,820 --> 00:02:57,170 US doing its view, then we want to validate once again if the Validate Yes unit, so you validate us 41 00:02:57,170 --> 00:03:05,600 units is true and only then do we want to get the height, value and feet. 42 00:03:06,770 --> 00:03:11,420 So here you as unit height value ft, which will be a string. 43 00:03:11,420 --> 00:03:13,310 We get that from our edit text. 44 00:03:13,340 --> 00:03:18,870 US metric units hide feet and we convert its tax property value into a string. 45 00:03:19,250 --> 00:03:22,850 Then we do the same thing with the hide value. 46 00:03:23,300 --> 00:03:26,680 So I'm going to do that with both height values. 47 00:03:26,690 --> 00:03:32,330 So we're doing it with both values here, with the feet and inch, and then we're also getting the weight. 48 00:03:32,630 --> 00:03:35,060 So he had a weight value would be a float. 49 00:03:35,840 --> 00:03:43,520 We're getting it as just a metric unit, weight text to string and then we're converting it into a float. 50 00:03:43,700 --> 00:03:46,850 So here, let me put it like this. 51 00:03:48,860 --> 00:03:52,190 And put this into the next line, I think that we should be good to go. 52 00:03:52,430 --> 00:03:53,120 Okay, so. 53 00:03:56,450 --> 00:03:56,990 Like this? 54 00:03:57,590 --> 00:03:59,250 OK, now we have the values. 55 00:03:59,270 --> 00:04:06,650 The problem is we now need to calculate the height value and the height value is in inches and also 56 00:04:06,650 --> 00:04:09,290 in feet, but one feet. 57 00:04:10,260 --> 00:04:18,720 Or one foot is a 12th of an inch, so we can calculate it using the following following formula so we 58 00:04:18,720 --> 00:04:23,280 say the height value is going to be the US unit's value, an inch, which is this string. 59 00:04:23,280 --> 00:04:30,300 We convert it into a float, plus the generate height value in feet, which is in a string, and we 60 00:04:30,300 --> 00:04:33,630 convert it into a float as well, and we multiplied with 12. 61 00:04:34,570 --> 00:04:40,770 OK, so this will give us the height value because in order to calculate the BMI, we need to, as you 62 00:04:40,770 --> 00:04:47,070 have seen, multiply with 703 and what do we need to multiply while the weight divided by the height 63 00:04:47,430 --> 00:04:47,880 squared? 64 00:04:48,930 --> 00:04:52,110 Okay, so the height value times the Heidfeld. 65 00:04:52,110 --> 00:04:59,190 You will give us the high value squared and we take the weight value and divide it by this. 66 00:04:59,190 --> 00:05:03,510 And then we take the 703 value to get the BMI. 67 00:05:04,170 --> 00:05:05,720 So whoever came up with this? 68 00:05:05,730 --> 00:05:06,690 Congratulations. 69 00:05:07,860 --> 00:05:13,200 So then we can now take this BMI and display the BMI results with that BMI. 70 00:05:15,070 --> 00:05:24,640 And if we do not have the valid US results, we can display this house block that we have here as well, 71 00:05:24,640 --> 00:05:28,600 which will just give us a toast text. 72 00:05:29,800 --> 00:05:33,650 Like so, which says, please enter a valid values. 73 00:05:34,880 --> 00:05:43,250 OK, so now we just need to call this method calculate units once we click on the calculate button. 74 00:05:43,250 --> 00:05:49,430 So all the way in our own create, we have this button calculate units set on Click Listener. 75 00:05:49,440 --> 00:05:51,710 Here, we need to calculate the units. 76 00:05:54,080 --> 00:05:57,050 So I believe there should be it, let's just try this. 77 00:06:01,890 --> 00:06:04,380 So let's go over to the BMI calculator. 78 00:06:04,620 --> 00:06:05,280 Wait. 79 00:06:07,180 --> 00:06:13,110 Which would be one hundred and fifty six, in my case, fee heights. 80 00:06:13,150 --> 00:06:14,290 I'm not very tall. 81 00:06:14,320 --> 00:06:14,980 What is it? 82 00:06:16,990 --> 00:06:24,130 It's five point five for like four, five and six, five five something like this. 83 00:06:25,060 --> 00:06:25,780 Calculate them. 84 00:06:25,780 --> 00:06:30,610 We see we have a similar BMI than I had in the metric units. 85 00:06:30,610 --> 00:06:38,800 So if I enter a 71 with one 69, then we see, well, it's and it's not exactly the same more or less, 86 00:06:38,800 --> 00:06:39,160 right? 87 00:06:39,640 --> 00:06:43,750 So that's the thing with feet, an inch and everything. 88 00:06:44,860 --> 00:06:50,340 But yeah, basically, you see, our application works now flawlessly for both ways. 89 00:06:50,830 --> 00:06:56,530 And now, instead of just having the BMI calculator here to bottom, I would like to also add a history 90 00:06:56,530 --> 00:06:57,520 of my exercise. 91 00:06:57,550 --> 00:06:59,470 So that's what we're going to do in the next video.