1 00:00:00,500 --> 00:00:06,110 So now as you can see here our application is running on this emulator and here you can see that I changed 2 00:00:06,410 --> 00:00:11,990 the color of this tattoo spot to this color and this is the theme of my application. 3 00:00:11,990 --> 00:00:12,470 OK. 4 00:00:12,650 --> 00:00:18,410 I'm not saying that this is a good theme but I just wanted to show you that you can customize the theme 5 00:00:18,410 --> 00:00:22,210 of your application OK however you want whatever you want. 6 00:00:22,250 --> 00:00:23,070 Right. 7 00:00:23,330 --> 00:00:31,580 So now let's actually go and let's actually add the Java codes to our application and make this application 8 00:00:31,820 --> 00:00:34,520 actually an application and applicable application. 9 00:00:34,520 --> 00:00:35,560 OK. 10 00:00:35,750 --> 00:00:41,330 Now it doesn't work right if they actually change this search bar or if we they actually enter a value 11 00:00:41,330 --> 00:00:41,990 here. 12 00:00:41,990 --> 00:00:43,040 It doesn't work here. 13 00:00:43,160 --> 00:00:50,780 We just we just need to actually put the logic to Java codes and then we can actually expect that this 14 00:00:50,780 --> 00:00:52,150 application to work. 15 00:00:52,370 --> 00:00:56,780 So now let's actually go inside this main activity that you have a file here. 16 00:00:57,080 --> 00:01:02,240 And as you can see if you have this class main activity that actually inherits all of the features and 17 00:01:02,240 --> 00:01:05,010 behaviors that are inside this app compare the activity. 18 00:01:05,300 --> 00:01:08,440 We have this uncreate method which you are already familiar with. 19 00:01:08,660 --> 00:01:13,670 And now we can actually go inside this main activity class and I'm going to paste some lines of code 20 00:01:13,670 --> 00:01:18,700 here and then I'm going to explain to you what's going on here. 21 00:01:18,740 --> 00:01:24,290 So now I'm going to pasting some lines of code here and then I'm going to explain to you what's going 22 00:01:24,290 --> 00:01:25,290 on here. 23 00:01:25,760 --> 00:01:30,670 So now I am actually inside this main activity class and I pasted these lines of code here. 24 00:01:30,860 --> 00:01:38,360 First of all in line number 10 I have actually an object and this object is actually type private. 25 00:01:38,390 --> 00:01:40,860 The access modifier of this object is private. 26 00:01:41,360 --> 00:01:43,540 And this object is actually static. 27 00:01:43,760 --> 00:01:44,400 OK. 28 00:01:44,660 --> 00:01:46,660 And this object is final. 29 00:01:46,670 --> 00:01:52,370 And this means that this is actually a constant and Data Type of this object is number format. 30 00:01:52,370 --> 00:01:52,940 Right. 31 00:01:52,940 --> 00:01:58,260 So let's actually open our web browser and let's go to the Android documentation here. 32 00:01:58,790 --> 00:02:06,930 And then let's actually search for non-bird for math class number format on here. 33 00:02:06,950 --> 00:02:12,430 As you can see inside this package Android that ICU that takes that number format. 34 00:02:12,490 --> 00:02:13,070 OK. 35 00:02:13,130 --> 00:02:14,800 Just choose this one here. 36 00:02:17,080 --> 00:02:18,150 Choose this class. 37 00:02:18,220 --> 00:02:26,600 So as you can see here it says we have our dialogue and it says this class requires AP level 24 or higher. 38 00:02:26,680 --> 00:02:32,000 This thug is hidden because you're selected API level for the documentation is to free. 39 00:02:32,050 --> 00:02:38,680 You can change the documentation level API level with the selector above the left navigation. 40 00:02:38,680 --> 00:02:40,610 So now let's actually click on this. 41 00:02:40,630 --> 00:02:46,660 OK make this page visible and here as you can see it's at the top. 42 00:02:46,670 --> 00:02:50,240 We can see this value AP 8:24 API level 24. 43 00:02:50,350 --> 00:02:52,720 And here we have this class number format. 44 00:02:53,080 --> 00:03:00,130 And this is actually a public abstract class and this class actually extends this for math class. 45 00:03:00,130 --> 00:03:02,460 So let's actually read the descriptions. 46 00:03:02,710 --> 00:03:10,510 And here it says are ice use repleat replacement for number format Misfit's field and other functionality 47 00:03:10,510 --> 00:03:18,630 specific to I.S. you are labeled ICU number format is the abstract base class for all number formats. 48 00:03:18,640 --> 00:03:24,350 This class provides the interface for formatting and parsing numbers. 49 00:03:24,610 --> 00:03:25,350 OK. 50 00:03:25,630 --> 00:03:32,800 Number format also provides methods for determining which locales have number formats and what their 51 00:03:32,800 --> 00:03:33,710 names are. 52 00:03:33,910 --> 00:03:39,580 Number format helps you to format and parse numbers for any locale. 53 00:03:39,670 --> 00:03:47,140 Your code can be completely independent of the lockout conventions for decimal points thousand separators 54 00:03:47,350 --> 00:03:53,590 or even to particular the single digits used or whether the number format is even similar to format 55 00:03:53,630 --> 00:03:56,210 and number for the current lookout locale. 56 00:03:56,260 --> 00:03:57,980 Use one of the factory class methods. 57 00:03:58,060 --> 00:04:04,460 So for example we have this thing value number format that get instance that formats my number so it 58 00:04:04,460 --> 00:04:10,090 can actually give us the specific value the specific value that is actually related to that specific 59 00:04:10,090 --> 00:04:10,900 locale. 60 00:04:11,200 --> 00:04:12,910 And then we can actually get there. 61 00:04:13,000 --> 00:04:18,700 For example we have different countries in the world and then it's going to give us the perfect value 62 00:04:18,700 --> 00:04:21,410 that is that is suitable for other countries. 63 00:04:21,460 --> 00:04:21,980 OK. 64 00:04:22,210 --> 00:04:27,750 So it can actually format that value and it's going to give us the perfect value for that specific locale. 65 00:04:27,970 --> 00:04:33,760 If you are formatting multiple numbers it is more efficient to get there format and use it multiple 66 00:04:33,760 --> 00:04:38,590 times so that the system doesn't have to fetch the information about the local language and country 67 00:04:38,590 --> 00:04:40,820 conventions multiple times. 68 00:04:40,840 --> 00:04:43,280 So here we have some examples here. 69 00:04:43,440 --> 00:04:50,360 And now let's look at some of the effects and here as you can see we have these constants so let's look 70 00:04:50,360 --> 00:04:51,760 at them if it's the public methods. 71 00:04:51,770 --> 00:04:58,550 We have this Meffert clone or the rights clone and now we can see this in a format Nefert and it says 72 00:04:58,700 --> 00:05:00,690 formats a big integer. 73 00:05:01,070 --> 00:05:01,740 OK. 74 00:05:02,150 --> 00:05:09,350 And here we have some other format Moffats as you can see with available locales return the list of 75 00:05:09,410 --> 00:05:17,330 locales for which numbered formats are available get currency returns the currency object used to display 76 00:05:17,330 --> 00:05:19,800 currency amounts. 77 00:05:19,910 --> 00:05:27,300 And here it says get currency instance returns a currency format for the specific for a specified locale. 78 00:05:27,530 --> 00:05:28,790 Get currency instance. 79 00:05:28,790 --> 00:05:35,720 This one actually accepts an argument of type your locale and this returns a currency format for the 80 00:05:35,720 --> 00:05:37,360 specified locale. 81 00:05:38,000 --> 00:05:44,780 And here you have the Smiffy returns that gets currency instance the returns currency format for the 82 00:05:44,780 --> 00:05:47,130 current default format locale. 83 00:05:47,270 --> 00:05:53,010 Get instant returns the default default number format for the current default format locale. 84 00:05:53,180 --> 00:05:57,470 And we have some lots of misfits here which you can actually rate them. 85 00:05:57,650 --> 00:06:02,210 But let's go back to our code and here we have this number for a math class. 86 00:06:02,210 --> 00:06:09,190 And actually this is the name of my object currency format's value assignment operator number format. 87 00:06:09,200 --> 00:06:13,980 OK I actually furter the name of this class number format that gets currency instance. 88 00:06:14,000 --> 00:06:20,330 So let's go back to our documentation in order to find the Smurfette gets currency instance as you can 89 00:06:20,330 --> 00:06:20,970 see here. 90 00:06:22,390 --> 00:06:28,330 So here is the Merfeld get good currency instance. 91 00:06:28,360 --> 00:06:34,640 So this is the method returns a currency format for the current default format locale. 92 00:06:34,950 --> 00:06:42,340 OK this method returns a currency format for the current default format locale so we can actually get 93 00:06:42,340 --> 00:06:47,510 the specifics to get the specific cut format of the specific locale. 94 00:06:47,530 --> 00:06:52,660 For example we have different different countries and then it's going to give us the perfect value that 95 00:06:52,660 --> 00:06:55,020 is actually suitable for other countries. 96 00:06:55,080 --> 00:06:55,460 OK. 97 00:06:55,480 --> 00:06:58,000 Number format that get currency instance. 98 00:06:58,000 --> 00:07:04,840 So here we have that actually that object that helps us to get the specific locale get the specific 99 00:07:04,840 --> 00:07:12,310 format that is actually related to that specific locale and in line number 11 as you can see private 100 00:07:12,310 --> 00:07:18,700 static final again number format pearlescent formats value and this this time I want to actually for 101 00:07:18,700 --> 00:07:25,810 example get the format specific format of the person's character that is actually suitable for other 102 00:07:25,810 --> 00:07:26,380 locales. 103 00:07:26,380 --> 00:07:31,590 For example U.S. or Europe countries or other countries of the world. 104 00:07:31,870 --> 00:07:37,050 So person format value assignment operator number format that gets percent instance. 105 00:07:37,230 --> 00:07:37,670 OK. 106 00:07:37,780 --> 00:07:40,350 So here we have those values. 107 00:07:40,780 --> 00:07:46,630 And now again inside this main activity class I'm going to paste in some lines of code here and then 108 00:07:46,660 --> 00:07:49,870 I'm going to explain to you what's going on here. 109 00:07:49,900 --> 00:07:54,610 So as you can see here these are the lines of code that I pasted here. 110 00:07:54,850 --> 00:08:01,060 And as you can see here in line number 16 I have actually a double variable and the access modifier 111 00:08:01,060 --> 00:08:06,450 of this value is actually private the data type is double and the name of this variable is actually 112 00:08:06,460 --> 00:08:07,680 bill amount. 113 00:08:07,690 --> 00:08:12,900 So here as you can see I assigned this value zero point zero to this a variable. 114 00:08:13,090 --> 00:08:17,680 And because the data type of this variable is double he had assigned this double value. 115 00:08:17,690 --> 00:08:20,310 Does this number to this value bet right. 116 00:08:20,710 --> 00:08:22,410 So low number 17. 117 00:08:22,470 --> 00:08:26,980 We have another variable which is actually private double Tepe percent. 118 00:08:26,980 --> 00:08:32,580 So the name of this variable is two percent assignment operator and he and as you can see I assign this 119 00:08:32,580 --> 00:08:36,750 value number 25 percent. 120 00:08:36,880 --> 00:08:41,500 As you can see here number 0.25 here as you can see. 121 00:08:41,680 --> 00:08:45,630 So this is my value that I assigned to this double variable. 122 00:08:46,060 --> 00:08:55,210 And here in line 18 I actually declared this takes view object private takes few th amount private takes 123 00:08:55,210 --> 00:09:02,140 buty 63 percent of inline 20 as you can see takes few takes the tip in line to anyone private takes 124 00:09:02,160 --> 00:09:09,400 few takes the total bill amount and inline 20 free as you can see here private double total salary assignment 125 00:09:09,400 --> 00:09:19,210 operator zero point zero in line 24 private double savings percent assignment operator 0.25 and in line 126 00:09:19,210 --> 00:09:20,620 25 as you can see here. 127 00:09:20,760 --> 00:09:27,000 It takes you to the same percent and in line at 26 as you can see private takes you. 128 00:09:27,210 --> 00:09:29,040 It takes the money saved. 129 00:09:29,110 --> 00:09:29,770 Right. 130 00:09:30,190 --> 00:09:34,870 So you actually declared these objects here and these variables. 131 00:09:35,080 --> 00:09:41,410 And in order to actually initialize these objects and then use them for our for example tip calculator 132 00:09:41,410 --> 00:09:41,720 app. 133 00:09:41,740 --> 00:09:44,850 And for our savings calculator app. 134 00:09:44,860 --> 00:09:49,870 So let's go inside this uncreate Meffert and initialize some of these objects that we declared inside 135 00:09:49,870 --> 00:09:50,680 this class. 136 00:09:50,890 --> 00:09:51,630 OK. 137 00:09:51,910 --> 00:09:56,540 So make sure to actually write all of these codes here inside this main activity class. 138 00:09:56,740 --> 00:10:02,420 And now let's go inside this uncreate method and let's actually do our job here.