1 00:00:00,150 --> 00:00:05,720 So now I am inside these main activity class and I want to actually implement this on method here. 2 00:00:05,730 --> 00:00:06,270 Right. 3 00:00:06,270 --> 00:00:11,020 First let's change the name of these arguments to view inside this method. 4 00:00:11,020 --> 00:00:16,930 I tried to create a variable of type martial arts putten so that button and here I can't say much a 5 00:00:16,930 --> 00:00:18,630 lot but an assignment operator. 6 00:00:18,630 --> 00:00:23,300 So now I want to cast this view to a martial art but an object. 7 00:00:23,310 --> 00:00:29,220 So I am 150 percent sure that I have martial art partons inside my main activity. 8 00:00:29,280 --> 00:00:32,570 My main activity actually but this view here doesn't know that. 9 00:00:32,580 --> 00:00:37,200 So the church has the to our martial art but then I truly object. 10 00:00:37,260 --> 00:00:43,590 So I can't say I can't put a lot of private practices martial or pattern here and I can just say View 11 00:00:44,080 --> 00:00:49,860 semi-hollow right in this if you are casting this view which is going to be the view the button that 12 00:00:49,860 --> 00:00:51,330 is triggering the action. 13 00:00:51,360 --> 00:00:53,680 So it is referring to an emotional button. 14 00:00:53,730 --> 00:00:59,970 So here we are just casting it to a marshal but an object and yet assigning it we are assigned to this 15 00:00:59,970 --> 00:01:00,380 value. 16 00:01:00,390 --> 00:01:07,950 But martial arts button now I can for example initialize my body but that I created in this class let 17 00:01:07,950 --> 00:01:12,410 me scroll to the top here you can see this variable here total martial arts place right. 18 00:01:12,570 --> 00:01:17,460 Let's scroll down here let's go and say this and uncle method and here I can say total martial arts 19 00:01:17,460 --> 00:01:22,400 price assignment operator total martial arts price plus added. 20 00:01:22,420 --> 00:01:25,350 I can refer to this martial art button here. 21 00:01:26,640 --> 00:01:28,550 That gets martial art. 22 00:01:28,560 --> 00:01:31,650 Price semi-colon right. 23 00:01:31,670 --> 00:01:38,130 So I think the value the current value of the total martial arts price to the value of the martial art 24 00:01:38,540 --> 00:01:43,020 martial art and that is actually interactive that is clicked or touched. 25 00:01:43,070 --> 00:01:43,690 Right. 26 00:01:43,730 --> 00:01:45,560 So and we're assigning it to this. 27 00:01:45,570 --> 00:01:52,900 Evaluate the price of that specific product that is being interactive that is being touched or clicked. 28 00:01:53,060 --> 00:01:56,570 We are actually adding that value to the value of the total price. 29 00:01:56,740 --> 00:02:01,530 And we are assigning the result of this operation to this valuable total martial arts price. 30 00:02:01,820 --> 00:02:06,940 So now after this line of course here let's actually create a new light here. 31 00:02:07,010 --> 00:02:13,910 So let's now format the martial art price here so let's create a value of type strange and the name 32 00:02:13,910 --> 00:02:21,340 of this variable is going to be martial arts place martial arts price formatted assignment operator 33 00:02:21,540 --> 00:02:29,480 can refer to this number for math class number format that get currency instance that format. 34 00:02:29,500 --> 00:02:34,210 So when I call for format here I can pass a value of type double to the format. 35 00:02:34,360 --> 00:02:41,290 MF It is and it's going to actually give us the currency instance from this life if it is going to give 36 00:02:41,290 --> 00:02:47,330 us a specific Actually the format of the price of the user's locale. 37 00:02:47,380 --> 00:02:50,040 So let's call it here and then I'm going to show you how it works. 38 00:02:50,040 --> 00:02:55,040 So let's actually pass this total Musharraf's place here to the Smurfette semi-colon. 39 00:02:55,120 --> 00:02:59,550 Let me create a new line here so that you can see what's going on here. 40 00:02:59,830 --> 00:03:01,640 Let me also create a new line here. 41 00:03:01,840 --> 00:03:08,040 So now that we have this model of the price format let's create a toast message so toast that makes 42 00:03:08,080 --> 00:03:13,720 text first we need to pass the context main activity that this come up and that we need to actually 43 00:03:13,720 --> 00:03:17,260 specify the text which is going to be martial that place. 44 00:03:17,290 --> 00:03:23,800 So Marshall Price for math so Marshall Price formatted this is going to be the takes so it is actually 45 00:03:23,800 --> 00:03:24,460 of type string. 46 00:03:24,460 --> 00:03:26,560 So it is OK to put that here come on. 47 00:03:26,680 --> 00:03:32,810 And then we need to specify the length which is going to be short data show let me create a new light 48 00:03:32,810 --> 00:03:33,350 here. 49 00:03:34,410 --> 00:03:39,330 And you've got to actually show this message this martial arts prize formatted here to the user. 50 00:03:39,450 --> 00:03:41,680 So let's run the application now. 51 00:03:41,700 --> 00:03:46,340 Let me show you the emulator so you can see that our application is running on the simulator. 52 00:03:46,350 --> 00:03:51,900 And now I want to click on this martial arts button here so you can see that the price is to follow 53 00:03:52,050 --> 00:03:52,490 right. 54 00:03:52,650 --> 00:03:55,780 If I click on it now it says $2000. 55 00:03:55,800 --> 00:04:01,110 So that's why we actually formatted our Marshall Price to that current locale. 56 00:04:01,110 --> 00:04:01,920 Right. 57 00:04:02,030 --> 00:04:06,570 You can see that here if I click on this one here this is Marshall put in here. 58 00:04:06,600 --> 00:04:08,720 Now it is $4000. 59 00:04:08,820 --> 00:04:11,730 If I click on this one now it's just $6000. 60 00:04:12,000 --> 00:04:18,780 It is actually adding the value of the Marshall Price to the current value of the total Manjunath price 61 00:04:18,870 --> 00:04:19,980 here. 62 00:04:19,980 --> 00:04:23,220 So for example this one or this one. 63 00:04:23,220 --> 00:04:29,950 So now are you going to allow the user to reset these the value of these total Marshall Price here. 64 00:04:30,030 --> 00:04:30,720 OK. 65 00:04:30,990 --> 00:04:32,310 So let's see how we can do that. 66 00:04:32,310 --> 00:04:35,820 Let's go back to android studio and let's go to this method. 67 00:04:35,880 --> 00:04:37,110 An option item selected here. 68 00:04:37,110 --> 00:04:37,620 Right. 69 00:04:37,890 --> 00:04:40,500 Let's create another case statement. 70 00:04:40,500 --> 00:04:48,220 So case our thought Id that reset just like in here is set as you can see we don't have a reset item 71 00:04:48,240 --> 00:04:49,710 here inside our menu. 72 00:04:49,710 --> 00:04:51,270 We need to create that. 73 00:04:51,270 --> 00:04:56,410 So in order to do that let's open our Android view here you just to click on view to the windows and 74 00:04:56,410 --> 00:04:57,350 then project. 75 00:04:57,360 --> 00:05:03,100 So just opened this up folder and the rest folder and here and this menu. 76 00:05:03,320 --> 00:05:06,190 Double click on this menu that underlie today in here. 77 00:05:06,300 --> 00:05:08,180 Let's add another item here. 78 00:05:08,280 --> 00:05:10,690 Let's open attacked and just happened yet idea. 79 00:05:11,250 --> 00:05:12,860 And the idea is going to be. 80 00:05:12,960 --> 00:05:20,880 So in order to specify the ID first we must pass at sign Plus Id slash and then we can actually say 81 00:05:21,030 --> 00:05:28,820 martial arts martial arts underline a priceless underline resets. 82 00:05:29,430 --> 00:05:30,240 Right. 83 00:05:30,300 --> 00:05:32,550 And then we need to specify the title. 84 00:05:32,580 --> 00:05:36,740 So here I can say reset the prices. 85 00:05:38,160 --> 00:05:43,150 Of martial arts or I can't say reset Matia that prices are reset. 86 00:05:43,200 --> 00:05:46,270 Martial arts martial arts prices. 87 00:05:46,410 --> 00:05:52,890 And finally you need to specify that sure as action if room and then itself close this tact by just 88 00:05:52,890 --> 00:05:59,610 putting a slash and then at this closing track here so that cities are IDM Let's go to our Actually 89 00:05:59,610 --> 00:06:07,050 the main activity class here and here I can't say Chase are thought Id that just they've been here reset 90 00:06:07,110 --> 00:06:09,020 Marshall marshal prices reset. 91 00:06:09,140 --> 00:06:11,140 Colin and here I can create. 92 00:06:11,220 --> 00:06:16,810 Actually we don't want to create an intent here we just want to reset the prices so I can refresh to 93 00:06:16,820 --> 00:06:23,560 is total martial arts price here and I can assign the value zero point zero to this variable. 94 00:06:23,580 --> 00:06:28,420 And finally I just need to return true from this case return to semi-colon. 95 00:06:28,600 --> 00:06:31,180 But let's run our application again. 96 00:06:31,740 --> 00:06:33,900 Let me show you the emulator. 97 00:06:33,990 --> 00:06:37,090 So here you can see that Apple is running on the simulator. 98 00:06:37,170 --> 00:06:39,640 So first let's click on this one to each box. 99 00:06:39,660 --> 00:06:41,130 Now it is $2000. 100 00:06:41,130 --> 00:06:42,270 Let's click on this one. 101 00:06:42,340 --> 00:06:43,320 $4000. 102 00:06:43,380 --> 00:06:48,080 This one $6000 and this one now is $8000. 103 00:06:48,090 --> 00:06:50,190 Now I want to reset the prices. 104 00:06:50,190 --> 00:06:55,810 So here let's just click on the ellipsis button here this dropdown menu here and now we have a new IDM 105 00:06:55,830 --> 00:06:56,310 reset. 106 00:06:56,310 --> 00:06:57,410 Martial arts places. 107 00:06:57,420 --> 00:07:03,270 If you click on it here now the prices is actually the total prices value is zero. 108 00:07:03,480 --> 00:07:05,660 So let's click on this one here. 109 00:07:05,670 --> 00:07:08,230 Now it says $2000 here right. 110 00:07:08,400 --> 00:07:11,670 If you want to you can actually just create a Toastmasters year. 111 00:07:11,910 --> 00:07:17,790 Below this item here for example for this chase or the idea that martial arts martial arts is reset 112 00:07:18,120 --> 00:07:26,620 I can't say toast that make text and that I can pass the context main activity that this come up. 113 00:07:26,820 --> 00:07:31,610 And then here for that message I can't say that I can't pass the value here. 114 00:07:31,620 --> 00:07:36,440 Total market of prices here plus two coats come on. 115 00:07:36,570 --> 00:07:42,690 And finally I can't say Len shorts that show let's run the app. 116 00:07:42,710 --> 00:07:45,230 Now let me show you the emulator. 117 00:07:45,260 --> 00:07:46,550 So here let's click on this one. 118 00:07:46,540 --> 00:07:50,200 Each box in here this one now it is $4000. 119 00:07:50,240 --> 00:07:52,500 Let's reset the prices here. 120 00:07:53,390 --> 00:07:56,580 Now it is actually showing us this value at zero point zero. 121 00:07:56,600 --> 00:07:57,450 It is now reset. 122 00:07:57,560 --> 00:08:00,410 If I click on it here again now it is $2000. 123 00:08:00,410 --> 00:08:05,000 So let's click on the dropdown menu and let's go to the Delete the marshal activity here. 124 00:08:05,210 --> 00:08:06,680 Let's delete all these. 125 00:08:06,830 --> 00:08:10,130 Actually most of the objects that we have inside our database. 126 00:08:10,280 --> 00:08:12,300 Let's click and go back here. 127 00:08:12,350 --> 00:08:17,550 Now you can see that are actually our main activity here is not updated here. 128 00:08:17,570 --> 00:08:23,450 We can see that we have still these martial art buttons here which we shouldn't have this much a lot 129 00:08:23,450 --> 00:08:24,140 of buttons here. 130 00:08:24,140 --> 00:08:26,570 There is actually a bug inside that application. 131 00:08:26,570 --> 00:08:28,360 How can we solve this problem. 132 00:08:28,370 --> 00:08:34,780 So here I want you to pause the video and then actually start debugging the application. 133 00:08:34,790 --> 00:08:40,940 According to the debugging skills that you have learned throughout this course first of all let me tell 134 00:08:40,940 --> 00:08:41,470 you that. 135 00:08:41,630 --> 00:08:43,170 Don't panic OK. 136 00:08:43,250 --> 00:08:50,270 Don't panic and just think about what's going wrong here and actually try to debug the application when 137 00:08:50,270 --> 00:08:51,070 you're ready. 138 00:08:51,140 --> 00:08:52,500 Just play the video again. 139 00:08:52,550 --> 00:08:55,740 And then here I'm going to show you what's wrong with our application. 140 00:08:55,790 --> 00:08:56,290 OK. 141 00:08:56,600 --> 00:09:00,120 So now let me tell you what is wrong with it. 142 00:09:00,170 --> 00:09:06,830 If it's your insight modify use an interface method here you can see that we here we have this IIF statement 143 00:09:06,860 --> 00:09:14,070 and here we are saying that if all martial art objects that size is actually greater than zero. 144 00:09:14,240 --> 00:09:18,950 Only in that case is going to execute the codes inside this code inside the curly braces of this if 145 00:09:19,010 --> 00:09:19,960 statements. 146 00:09:20,000 --> 00:09:25,090 So we have this line of code here scroll view that remove all views in lay out. 147 00:09:25,100 --> 00:09:31,220 So this method here is going to be executed only and only if the size of the. 148 00:09:31,220 --> 00:09:35,220 All martial arts objects are Adie's is greater than zero. 149 00:09:35,300 --> 00:09:36,210 Right. 150 00:09:36,260 --> 00:09:39,320 So we need to think about a another way in order to solve this problem. 151 00:09:39,320 --> 00:09:42,350 So here let's actually cut this kind of quick here. 152 00:09:43,190 --> 00:09:46,180 And let's put it here before this if statement. 153 00:09:46,190 --> 00:09:48,510 And below is actually released here. 154 00:09:48,530 --> 00:09:50,650 Let's put it here now. 155 00:09:50,810 --> 00:09:52,670 Let me run the application again. 156 00:09:52,670 --> 00:09:54,270 Let me show you the emulator. 157 00:09:54,320 --> 00:09:57,350 So this is our application and we have no martial arts objects here. 158 00:09:57,390 --> 00:09:57,840 OK. 159 00:09:58,040 --> 00:10:04,040 At martial arts activity here let's add a martial art here for example this time we want to teach boxing 160 00:10:04,830 --> 00:10:07,420 kickboxing the martial art price is for. 161 00:10:07,610 --> 00:10:11,470 For example one thousand dollars and the marshal of color is yellow. 162 00:10:12,510 --> 00:10:13,160 Right. 163 00:10:13,320 --> 00:10:18,380 Let's at the martial art let's for example add a bunch of martial arts you just click on the spot in 164 00:10:18,390 --> 00:10:19,040 here. 165 00:10:19,170 --> 00:10:21,270 So let's click on back button here. 166 00:10:21,270 --> 00:10:23,670 Now we have these martial arts here right. 167 00:10:23,700 --> 00:10:25,980 This monster that buttons. 168 00:10:26,010 --> 00:10:30,090 So now let's click on this ellipsis button here. 169 00:10:30,180 --> 00:10:32,610 Let's go to the delete marshal activity here. 170 00:10:32,610 --> 00:10:37,180 Now let's delete all these martial arts objects here that just click on them in order to delete them. 171 00:10:37,230 --> 00:10:44,360 Now let's go back and here you can see everything is gone and our application is working properly here. 172 00:10:44,460 --> 00:10:44,850 Right. 173 00:10:44,850 --> 00:10:45,350 Why. 174 00:10:45,360 --> 00:10:51,660 Because I am calling the Smurfette here before this if statement not inside this statement because if 175 00:10:51,660 --> 00:10:58,830 you actually for example delete all Monserrat objects then it cannot actually for example remove all 176 00:10:58,830 --> 00:11:05,340 these views here that we have inside the scroll view because this statement here this condition evaluates 177 00:11:05,340 --> 00:11:06,090 to false. 178 00:11:06,120 --> 00:11:08,850 So it's not going to execute the codes inside this statement. 179 00:11:08,910 --> 00:11:12,030 So we just put this line of code here before this statement. 180 00:11:12,060 --> 00:11:12,510 Right. 181 00:11:12,510 --> 00:11:16,770 Whenever this method is going to be called you're going to remove all the views that we have inside 182 00:11:16,770 --> 00:11:21,570 the scroll wheel and there we can actually for example look at this condition and it's a hoot. 183 00:11:21,570 --> 00:11:22,750 All these quotes here. 184 00:11:23,070 --> 00:11:25,380 So let's add another object here. 185 00:11:25,380 --> 00:11:28,110 So for example let's get behind this at martial art here. 186 00:11:28,110 --> 00:11:30,420 For example this time I want to add Judo. 187 00:11:30,420 --> 00:11:30,870 Right. 188 00:11:31,020 --> 00:11:37,870 And the martial law applies for example $5000 and martial art color here is for example green. 189 00:11:38,070 --> 00:11:38,530 Right. 190 00:11:38,640 --> 00:11:42,000 Let's add some martial arts here to our database. 191 00:11:42,000 --> 00:11:46,340 If I recall back here you can see that we have these patents here. 192 00:11:46,350 --> 00:11:49,590 Now I can go to the for example did Monserrat here. 193 00:11:49,620 --> 00:11:53,320 I can delete some of them if I can you can go back here. 194 00:11:53,400 --> 00:11:59,820 Now you can see that it is actually the updated view is updated properly and it works fine. 195 00:11:59,820 --> 00:12:00,780 So that's it. 196 00:12:00,780 --> 00:12:06,780 This is our application this is the end of this app and I hope that you have learnt a lot of concepts 197 00:12:06,980 --> 00:12:08,380 actually about a school. 198 00:12:08,400 --> 00:12:14,960 You have mastered if you have finished this apps up until this actually does part. 199 00:12:15,300 --> 00:12:20,300 You have finished actually mastering a skill light in Android. 200 00:12:20,310 --> 00:12:23,190 You are now actually askew like master. 201 00:12:23,220 --> 00:12:30,030 Make sure to create applications of your own and use as a light database in your own applications in 202 00:12:30,030 --> 00:12:36,600 order to actually just practice on these very helpful skills very precious skills. 203 00:12:36,600 --> 00:12:37,830 Thank you very much for watching. 204 00:12:37,830 --> 00:12:42,360 If you have any questions please post the discussion in the course and then I'll do my best to answer 205 00:12:42,390 --> 00:12:44,040 all of your questions. 206 00:12:44,040 --> 00:12:48,670 So I'm going to create some more actually application some more awesome applications. 207 00:12:48,930 --> 00:12:50,720 And I'm going to add them to the course. 208 00:12:50,810 --> 00:12:53,370 So make sure to actually stay tuned. 209 00:12:53,610 --> 00:12:55,050 I will add them to the course. 210 00:12:55,050 --> 00:12:59,400 I will add some new tutorials in order to create some production the applications. 211 00:12:59,400 --> 00:13:00,410 Thank you very much for watching. 212 00:13:00,420 --> 00:13:01,640 And as I said earlier.