1 00:00:00,950 --> 00:00:01,550 Welcome back. 2 00:00:01,790 --> 00:00:08,390 And this we have we are going to now use the details that we get from our debt picture dialogue and 3 00:00:08,390 --> 00:00:11,240 then display them for now, just in the toast here. 4 00:00:11,540 --> 00:00:15,290 So we'll get the here, we get the month and we get the day of the month. 5 00:00:15,560 --> 00:00:21,650 So let's go ahead and just use the year, for example, so we can just say year. 6 00:00:23,380 --> 00:00:26,560 Was and then the year here. 7 00:00:27,500 --> 00:00:29,000 And let's just say here. 8 00:00:29,420 --> 00:00:30,860 So let's test that once again. 9 00:00:31,830 --> 00:00:39,960 And see if the selected year was 20 21 and you see it was 20 21, so now we can do the same thing and 10 00:00:39,960 --> 00:00:44,490 say month was and then the month. 11 00:00:44,730 --> 00:00:45,750 So let's test it. 12 00:00:47,560 --> 00:00:54,220 And select a date, so the month was to September and I at sea and month was eight. 13 00:00:54,220 --> 00:00:55,630 Oh, September, isn't it? 14 00:00:55,630 --> 00:00:56,980 September is nine, right? 15 00:00:57,190 --> 00:00:58,210 So what's up here? 16 00:00:58,390 --> 00:01:04,510 Well, the problem is that months are calculated again in the programming way, starting from zero. 17 00:01:04,720 --> 00:01:10,090 So January is month zero, February is month one and so forth. 18 00:01:10,420 --> 00:01:17,530 So what we need to do is we need to add the one to the month year, for example. 19 00:01:17,680 --> 00:01:21,610 So plus one, let's see and test it again. 20 00:01:22,570 --> 00:01:31,210 So select the date and we can see month plus nine and then we can also use the day of month and. 21 00:01:32,480 --> 00:01:37,040 That would be day of month, and let's test that again. 22 00:01:38,300 --> 00:01:41,520 And we will see that it shows the 15th. 23 00:01:41,540 --> 00:01:45,920 So for some reason, the month is out of this world and starts at zero. 24 00:01:46,100 --> 00:01:47,370 That day, however, doesn't. 25 00:01:47,390 --> 00:01:50,090 So I don't know why that is, but that's how it is internally. 26 00:01:51,360 --> 00:01:59,190 Now we could make those names a little clearer, so we can say selected year, then selected month and 27 00:01:59,190 --> 00:01:59,760 so forth. 28 00:02:00,000 --> 00:02:04,770 This would make it a little more readable in terms of the coat. 29 00:02:05,130 --> 00:02:13,860 OK, so let's use those here instead selected the year and date of month, and we put that in another 30 00:02:13,860 --> 00:02:14,670 line here. 31 00:02:15,090 --> 00:02:15,630 Like So? 32 00:02:16,380 --> 00:02:22,590 OK, so now it will be a little more clear when it comes to the naming of those variables here. 33 00:02:25,100 --> 00:02:34,760 OK, so now let's go ahead and set of this text here, this one where it says 31st of May 1988 and display 34 00:02:34,760 --> 00:02:39,080 that instead, therefore we need to give this TextView a name an ID better set. 35 00:02:39,440 --> 00:02:41,270 So I'm going to give it an ID. 36 00:02:41,570 --> 00:02:46,400 You can go ahead and do it directly here, so click onto it and click here. 37 00:02:46,750 --> 00:02:51,350 Going to call the TV standing for text view, and I'm going to call this one selected date. 38 00:02:51,590 --> 00:02:56,840 OK, so this will be the I.D. I pressed the enter key for this to be taken over. 39 00:02:56,900 --> 00:02:59,690 And you will see that this text view here. 40 00:03:01,050 --> 00:03:05,880 This one that is selected, which will also be highlighted if you highlighted here, it will be highlighted 41 00:03:05,880 --> 00:03:07,770 in the designer as well. 42 00:03:08,160 --> 00:03:14,130 And you can see that this is in fact text view that has this idea of TV selected date. 43 00:03:14,640 --> 00:03:20,790 Now we can use that, we can just we use it in here in our click date picker. 44 00:03:21,120 --> 00:03:27,940 Unfortunately, however, we will need to create an eye while a new variable for it. 45 00:03:27,960 --> 00:03:34,590 So let's go ahead and create a new variable valve TV and how they call it T V. 46 00:03:35,590 --> 00:03:37,510 They are selected. 47 00:03:39,340 --> 00:03:45,190 Date, which is going to be of type, text view, Nullarbor. 48 00:03:46,060 --> 00:03:49,070 OK, and I will assign null to it for now. 49 00:03:49,330 --> 00:03:51,220 So we need to import it. 50 00:03:51,460 --> 00:03:55,120 You can see this widget here has been added to the widget. 51 00:03:55,120 --> 00:03:56,410 Text view has been added. 52 00:03:56,830 --> 00:04:03,310 So what I'm doing here is I'm creating this text view variable as a Nullarbor so that I can set it to 53 00:04:03,310 --> 00:04:08,890 null because I will not initialize it at this point, so I might assign a value to it at this point. 54 00:04:09,100 --> 00:04:16,240 I will leave it empty until the point where I'm going to actually assign it, and that is usually in 55 00:04:16,240 --> 00:04:17,320 the on create method. 56 00:04:17,350 --> 00:04:22,240 So it's a good practice to set it up in the on create method. 57 00:04:22,330 --> 00:04:29,020 So here TV's selected date will be found by its ID or Dot ID. 58 00:04:29,230 --> 00:04:30,100 And what was the name? 59 00:04:30,400 --> 00:04:37,900 Well, I called it TBE selected date and this is, of course, going to be a VAR here and not a vowel 60 00:04:37,900 --> 00:04:40,810 so that I can actually change it after it has been created. 61 00:04:41,320 --> 00:04:46,960 I'm creating this VAR and I also should make it private so that it's only going to be usable inside 62 00:04:46,960 --> 00:04:54,100 of this main activity and never accessible from another class because you don't want the situation to 63 00:04:54,100 --> 00:05:01,750 happen where you are accessing the UI element of an activity that is currently not in view, which means 64 00:05:01,750 --> 00:05:06,820 that an activity that you currently cannot see because if you tried to do that, your application will 65 00:05:06,820 --> 00:05:07,180 crash. 66 00:05:07,370 --> 00:05:07,750 OK. 67 00:05:08,050 --> 00:05:13,000 So what we're waiting here is exactly that by using this private key word for now. 68 00:05:13,600 --> 00:05:19,660 So we have this VAR TV selected date and now we can actually use it in our data picker dialog. 69 00:05:19,870 --> 00:05:28,680 So now we can store the selected year, month and day of month in the right format or in whatever form 70 00:05:28,690 --> 00:05:30,040 it we want to have. 71 00:05:30,250 --> 00:05:37,450 So I'm going to create a new variable called selected date, and I will just use string interpolation 72 00:05:37,450 --> 00:05:37,660 here. 73 00:05:37,660 --> 00:05:40,450 Selected and. 74 00:05:41,580 --> 00:05:50,250 In my case, I'm going to use day of month slash then the selected month, and here we need to use brackets 75 00:05:50,250 --> 00:05:56,700 right like two month plus one because we had this weird situation. 76 00:05:57,300 --> 00:06:02,550 And then another slash and selected year. 77 00:06:04,680 --> 00:06:10,170 Now we can set the text of our TV selected date, so in order to set the text, you can just choose 78 00:06:10,170 --> 00:06:11,430 to set text method. 79 00:06:12,000 --> 00:06:17,040 OK, so set the text with our selected date. 80 00:06:17,710 --> 00:06:18,150 Okay. 81 00:06:19,210 --> 00:06:24,580 And here, because this is a novel when he had the question mark. 82 00:06:24,760 --> 00:06:28,060 So set the text, that's one way of assigning a text. 83 00:06:28,060 --> 00:06:35,320 Another way is to just use the property so you can hover over here and see what the IDF has to offer 84 00:06:35,320 --> 00:06:35,950 for you. 85 00:06:36,310 --> 00:06:39,310 And here it says, to set use the property syntax. 86 00:06:39,310 --> 00:06:45,790 So that would be the alternative way here where you say TV selected date dot text and then you assign 87 00:06:45,790 --> 00:06:46,930 the selected text. 88 00:06:46,940 --> 00:06:52,300 So instead of using the set text method, which would be the old fashioned way, you can directly use 89 00:06:52,300 --> 00:06:54,760 the property of the selected date. 90 00:06:55,150 --> 00:06:56,500 OK, so let's test this. 91 00:06:56,830 --> 00:06:59,970 Let's see if it's actually going to display the selected date. 92 00:06:59,980 --> 00:07:04,630 So let's select the 15th and you see 15 nine 2021. 93 00:07:05,110 --> 00:07:10,030 So that seems to work, and it even is in that format that I just set. 94 00:07:10,120 --> 00:07:13,180 So day of the month, selected month, selected year. 95 00:07:15,000 --> 00:07:22,140 OK, so now we have the date in a certain format, but we need to have it in a data format in a sense 96 00:07:22,140 --> 00:07:31,140 of a date object so that we can then use it for calculating how much time has passed ever since. 97 00:07:31,740 --> 00:07:38,100 So in order to do that, I'm going to create a new variable called SDF, and this variable is going 98 00:07:38,100 --> 00:07:42,240 to be using the simple date format here and. 99 00:07:43,200 --> 00:07:51,000 What it allows us to do is, and here I'm going to use the simple data format like so and what it allows 100 00:07:51,000 --> 00:07:56,970 us to do is to define a pattern that we want to use for our date. 101 00:07:57,150 --> 00:08:02,850 So for example, if I want to use day to day, then month month and then year you year. 102 00:08:02,910 --> 00:08:06,330 So let's say the 31st of 05. 103 00:08:07,380 --> 00:08:10,770 Then in 1988, for example, then this would be the right format. 104 00:08:11,160 --> 00:08:16,470 And you can also define the local that you want to use. 105 00:08:16,740 --> 00:08:23,220 For example, the English format of using calendar dates or the French format and so forth. 106 00:08:23,430 --> 00:08:26,460 So local English will be the way to go here. 107 00:08:26,970 --> 00:08:33,539 So now we need to import simple date format, and I'm going to use the Java format here. 108 00:08:33,690 --> 00:08:35,340 So this java the text. 109 00:08:36,030 --> 00:08:39,600 OK, so this is the pattern, and then you need to pass to locale. 110 00:08:39,600 --> 00:08:42,330 So we're creating an object of the simple data format. 111 00:08:42,900 --> 00:08:49,890 And what this allows us to do is now to create an actual date object out of this as the F. 112 00:08:50,280 --> 00:08:54,810 So we're parsing from our selected date, which is just a string. 113 00:08:55,080 --> 00:09:03,750 We're converting that date here into the format that we want to use in a date object. 114 00:09:06,790 --> 00:09:12,520 And then this date object will later be used for us to calculate how much time has passed. 115 00:09:14,350 --> 00:09:18,280 By the way, just in order to make things a little clearer. 116 00:09:18,370 --> 00:09:24,670 So if you don't understand what a class does or if it goes over your head, if I ever use something 117 00:09:24,670 --> 00:09:31,480 like, for example, this simple date format, right now, I'm using this new simple date format class 118 00:09:31,480 --> 00:09:34,570 or before that I used to date picker dialog class. 119 00:09:34,870 --> 00:09:39,550 If you don't understand them, I always recommend to check out the documentation because you you'll 120 00:09:39,550 --> 00:09:43,870 find the simple date format and in particular, the one that we are using, which is under Java. 121 00:09:43,870 --> 00:09:44,440 That text? 122 00:09:44,620 --> 00:09:50,500 OK, so that's where you can find the data format class and you can find more details about it here, 123 00:09:50,770 --> 00:09:51,300 for example. 124 00:09:51,310 --> 00:09:54,790 Also with all of these letters mean so you have the AM. 125 00:09:54,790 --> 00:09:58,960 For example, the Capital M stands for month in a year. 126 00:09:59,230 --> 00:10:03,610 So here it would be July dual 07. 127 00:10:03,620 --> 00:10:07,690 So this would be the different formats, context sensitive. 128 00:10:08,170 --> 00:10:12,640 Or if you use a lower M, that would be the minute in an hour. 129 00:10:12,910 --> 00:10:14,050 So that's really important. 130 00:10:14,050 --> 00:10:21,370 That's why we were using the double M here as capital letters because lower caps M would be minutes. 131 00:10:21,850 --> 00:10:27,790 So D, let's look at what this means and D stands for day in month. 132 00:10:28,120 --> 00:10:33,310 OK, so day and month, which is a number, for example, the 10th or the 15th or whatever. 133 00:10:33,610 --> 00:10:37,550 And then finally, we have y y y, which stands for yea, yea yea. 134 00:10:38,260 --> 00:10:44,080 And here you can go over and see what is lower y means. 135 00:10:44,380 --> 00:10:51,160 So here does y just means yea, as you can see here, so y y would display a nine six and y y y would 136 00:10:51,160 --> 00:10:52,510 display in 1996. 137 00:10:52,840 --> 00:10:58,270 The single goes, by the way, also four month if you were to use M and it would display July. 138 00:10:58,270 --> 00:10:59,950 If it were, you use images. 139 00:10:59,950 --> 00:11:01,450 We'll just use zero seven. 140 00:11:03,440 --> 00:11:10,460 OK, but that's generally something that I'm trying to do is not to do too many things at once and not 141 00:11:10,970 --> 00:11:14,060 exaggerate how deep I go into something. 142 00:11:14,330 --> 00:11:18,890 So I'm trying to not bore you with going too deep into every single detail. 143 00:11:19,460 --> 00:11:24,230 And at the same time, give you enough information so that you get a good understanding of what's going 144 00:11:24,230 --> 00:11:24,500 on. 145 00:11:24,860 --> 00:11:30,950 But if you feel like there is something missing, so there is some class that you don't understand or 146 00:11:31,220 --> 00:11:38,960 some piece of code that you would like to know deeper or more about, then I really recommend to check 147 00:11:38,960 --> 00:11:44,030 out that documentation or Stack Overflow because I don't want to bore the ones that just want to go 148 00:11:44,030 --> 00:11:49,280 through with it and don't care about the specific details, but just want to know how to actually apply 149 00:11:49,280 --> 00:11:52,370 it rather than knowing everything in depth. 150 00:11:53,150 --> 00:11:58,730 OK, so that's just something that I wanted to give you as a side note, so let's finalize the application 151 00:11:58,730 --> 00:11:59,510 in the next video.