1 00:00:00,360 --> 00:00:09,120 So here I can just take Pontiac's the five stars student that said text and inside Apprentice's I need 2 00:00:09,120 --> 00:00:12,520 to just be fair to the name of the five stars review. 3 00:00:12,640 --> 00:00:12,980 OK. 4 00:00:12,990 --> 00:00:15,660 Plus two double quotes. 5 00:00:16,200 --> 00:00:16,920 OK. 6 00:00:17,250 --> 00:00:26,850 Again just typing here takes the Forresters student that said text for star review plus two double quotes 7 00:00:27,500 --> 00:00:39,480 takes the freestylers student that said text free starts review plus two double quotes TXI the two stars. 8 00:00:39,570 --> 00:00:51,540 Student That said text to start a review plus two double quotes takes the one to start student. 9 00:00:51,720 --> 00:00:57,240 That said text one star review plus two double quotes. 10 00:00:57,790 --> 00:01:02,810 OK so now let's actually run our project and see what happens. 11 00:01:02,970 --> 00:01:08,510 So as you can see here our application is actually running on this emulator and here as you can see 12 00:01:08,520 --> 00:01:10,020 it let's actually click on this. 13 00:01:10,020 --> 00:01:11,910 Show me the results button here. 14 00:01:11,940 --> 00:01:14,540 In order to see what's the results. 15 00:01:14,550 --> 00:01:15,660 OK. 16 00:01:16,260 --> 00:01:19,960 As you can see here these values are from these student reviews. 17 00:01:19,980 --> 00:01:20,690 OK. 18 00:01:21,060 --> 00:01:26,340 And here we are actually to reading these values and we are saying that we have four students with five 19 00:01:26,340 --> 00:01:27,970 star review. 20 00:01:27,990 --> 00:01:32,020 We have two students with four stars of The View. 21 00:01:32,280 --> 00:01:36,320 We have four students with of The View. 22 00:01:36,570 --> 00:01:43,080 We have two students we have three students with two stars of The View and we have one student with 23 00:01:43,140 --> 00:01:44,650 one star review OK. 24 00:01:44,910 --> 00:01:49,860 And here we are actually reading the values that are actually inside of the students reviews and we 25 00:01:49,860 --> 00:01:51,880 are outputting those values to the screen. 26 00:01:51,960 --> 00:01:52,390 OK. 27 00:01:52,530 --> 00:01:54,340 OK everyone. 28 00:01:54,480 --> 00:01:58,880 As you can see here our application is actually working right here on the simulator. 29 00:01:59,130 --> 00:02:02,130 But are there is a really nasty bug in our application. 30 00:02:02,250 --> 00:02:07,420 If you actually click on this or show me the results button here again let's see what happens. 31 00:02:07,630 --> 00:02:10,070 Oh as you can see the values changed. 32 00:02:10,080 --> 00:02:12,200 Eight for eight. 33 00:02:12,230 --> 00:02:14,280 And again the values changed. 34 00:02:14,460 --> 00:02:15,670 So that's not right. 35 00:02:15,670 --> 00:02:19,560 That's that's a bug in our application that these values should not be changed. 36 00:02:19,560 --> 00:02:25,380 OK because we are reading these values from these of them that are actually inside of these students 37 00:02:25,380 --> 00:02:26,310 reviews. 38 00:02:26,310 --> 00:02:26,860 OK. 39 00:02:27,150 --> 00:02:34,750 As you can see here the problem occurs when this for loop is executed in sight of this of unclick Meffert. 40 00:02:34,770 --> 00:02:35,390 OK. 41 00:02:35,670 --> 00:02:39,990 So when you actually click on this button first of all it's going to actually execute this for a loop 42 00:02:39,990 --> 00:02:40,420 here. 43 00:02:40,530 --> 00:02:41,030 OK. 44 00:02:41,130 --> 00:02:44,210 As you can see here it is inside of this for loop. 45 00:02:44,380 --> 00:02:48,120 We have actually put some if statements here and inside. 46 00:02:48,150 --> 00:02:54,510 And here I am saying that for example if students reviews up in the x is equal to number five plus plus 47 00:02:54,510 --> 00:02:57,870 five stars review then it's going to actually go inside of this array. 48 00:02:57,870 --> 00:03:04,170 And if it finds for example a value that is equal to this number five then it's going to actually increment 49 00:03:04,200 --> 00:03:07,380 the value of this a five star review by one. 50 00:03:07,440 --> 00:03:08,030 OK. 51 00:03:08,160 --> 00:03:11,690 And then it's going to actually outputs that value to that screen. 52 00:03:11,840 --> 00:03:12,300 OK. 53 00:03:12,330 --> 00:03:15,910 So that's why we can see that these values are changing here. 54 00:03:16,050 --> 00:03:16,380 Why. 55 00:03:16,410 --> 00:03:18,900 When we actually click on the spot in here OK. 56 00:03:19,050 --> 00:03:24,660 Because every time that we actually click on the spot and I try to execute this follow up here and then 57 00:03:24,660 --> 00:03:30,090 it's going I try to go inside this follow up and then when it finds a value that is inside of this array 58 00:03:30,410 --> 00:03:36,030 and that video for example is of equal to this number it can actually increment the value of these variables 59 00:03:36,030 --> 00:03:37,010 that we created here. 60 00:03:37,010 --> 00:03:37,540 OK. 61 00:03:37,830 --> 00:03:42,910 And here we are actually outputting the value of these variables to the screen. 62 00:03:43,140 --> 00:03:43,650 OK. 63 00:03:43,710 --> 00:03:46,380 So there are three solutions to this problem. 64 00:03:46,380 --> 00:03:46,900 OK. 65 00:03:47,070 --> 00:03:53,150 The first solution is actually after executing these lines of code after this follow up after this for 66 00:03:53,160 --> 00:03:56,080 loop and after executing these lines of code here. 67 00:03:56,160 --> 00:03:56,620 OK. 68 00:03:56,730 --> 00:04:06,690 So here I just into typing between results that said visibility view that invisible. 69 00:04:06,930 --> 00:04:12,730 So now as you can see here I am actually putting this line of code here after executing these lines 70 00:04:12,750 --> 00:04:15,010 of code here after executing this for loop. 71 00:04:15,420 --> 00:04:21,510 And then after executing these lines of code here it's going to actually make the spot in between results 72 00:04:21,600 --> 00:04:25,730 invisible so that the user can not interact with that button anymore. 73 00:04:26,040 --> 00:04:28,540 So let's actually run our project and see what happens. 74 00:04:28,650 --> 00:04:34,170 So as you can see here our application is actually running on this emulator on here. 75 00:04:34,280 --> 00:04:37,240 If you actually click on the spot and let's see what happens. 76 00:04:37,290 --> 00:04:41,430 Now we can see the results here and now that button is gone. 77 00:04:41,430 --> 00:04:41,880 OK. 78 00:04:41,910 --> 00:04:49,510 So as you can see here now that button is when is invisible and I cannot interact with that button anymore. 79 00:04:49,800 --> 00:04:51,350 So these are the results here. 80 00:04:51,510 --> 00:04:56,260 And as you can see we've got four students with Fife's with five star review. 81 00:04:56,280 --> 00:04:59,520 We've got two students with our four star review. 82 00:04:59,520 --> 00:05:01,580 We've got four students with us. 83 00:05:01,590 --> 00:05:06,980 We started freestylers review and we've got three students with two stars review. 84 00:05:07,200 --> 00:05:09,580 And here we've got one student with one star review. 85 00:05:09,580 --> 00:05:10,080 OK. 86 00:05:10,350 --> 00:05:14,140 As you can see these are the values that are actually inside of this array. 87 00:05:14,310 --> 00:05:16,320 And here I am actually reading. 88 00:05:16,410 --> 00:05:24,390 Those are values here as you can see and out putting those values onto the screen here so hopefully 89 00:05:24,390 --> 00:05:25,660 that makes sense. 90 00:05:25,890 --> 00:05:28,620 And there is another solution to this problem too. 91 00:05:28,920 --> 00:05:34,440 So let's actually go back and say this main activity dodgeball fight here and let's actually comment 92 00:05:34,440 --> 00:05:42,240 out this line of code here and here inside of this main activity class is actually create a boolean 93 00:05:42,950 --> 00:05:43,800 variable. 94 00:05:43,970 --> 00:05:47,140 Bullion and the name of this variable is first time. 95 00:05:47,340 --> 00:05:49,570 And then let's actually assign the value. 96 00:05:49,610 --> 00:05:50,420 True. 97 00:05:50,700 --> 00:05:51,350 This right here. 98 00:05:51,350 --> 00:05:52,250 Well OK. 99 00:05:52,650 --> 00:05:58,470 And inside of these are set on calculus and are here as you can see inside of this method as you can 100 00:05:58,470 --> 00:06:00,440 see inside of this ugly Smurfette. 101 00:06:00,470 --> 00:06:03,980 Now I can just create an if statement here. 102 00:06:03,990 --> 00:06:08,630 OK enough first time. 103 00:06:09,270 --> 00:06:09,720 OK. 104 00:06:09,780 --> 00:06:17,130 If the value of this first time value is true OK then we can actually put these lines of code here. 105 00:06:17,130 --> 00:06:23,460 These are for loop inside of these first time OK. 106 00:06:23,720 --> 00:06:30,080 And here after this for loop after the end in curly brace of this for loop here I can actually assign 107 00:06:30,980 --> 00:06:37,760 the value false to this first thing but first time assignment operator false. 108 00:06:38,510 --> 00:06:39,450 OK. 109 00:06:39,710 --> 00:06:43,970 So now it's actually on our project and let's see what happens. 110 00:06:43,970 --> 00:06:49,330 So as you can see here now our application is actually run in an emulator. 111 00:06:49,640 --> 00:06:54,040 And here if you actually click on this show me the result spot and let's see what happens. 112 00:06:54,560 --> 00:06:57,040 As you can see now we can see the results here. 113 00:06:57,110 --> 00:06:57,610 OK. 114 00:06:57,770 --> 00:07:04,270 So let's actually click on this button again as you can see these values actually don't change here. 115 00:07:04,310 --> 00:07:04,780 OK. 116 00:07:04,880 --> 00:07:11,630 If I click on this button here now you can see these values are actually don't change and our codes 117 00:07:11,690 --> 00:07:12,990 are actually working right. 118 00:07:13,040 --> 00:07:13,610 OK. 119 00:07:13,700 --> 00:07:19,110 So here we actually created a boolean variable first time and I assigned the value true to this value. 120 00:07:19,560 --> 00:07:25,910 And inside of this Meffert I said that if first time valuable is true if the value of these first time 121 00:07:25,910 --> 00:07:29,240 is true then execs used these lines of code. 122 00:07:29,230 --> 00:07:30,320 Here it is for loop. 123 00:07:30,460 --> 00:07:35,060 So the first thing that we actually click on that button on this. 124 00:07:35,060 --> 00:07:36,300 Show me the results button. 125 00:07:36,470 --> 00:07:39,090 The value of these first time valuable is true. 126 00:07:39,110 --> 00:07:39,790 OK. 127 00:07:40,130 --> 00:07:45,770 So then it's going actually execute this for a loop and then it's going to actually increment the values 128 00:07:45,860 --> 00:07:48,470 of the values of these variables. 129 00:07:48,470 --> 00:07:54,130 For example this five story finally starts really valuable according to the value that is actually inside 130 00:07:54,140 --> 00:07:57,650 of the index of that student reviews array. 131 00:07:57,860 --> 00:08:04,070 And then after executing this for loop after the ending are curly brace of this for loop we set that 132 00:08:04,070 --> 00:08:07,150 first time assignment operator for us. 133 00:08:07,190 --> 00:08:10,300 So the value of this first time variable is now false. 134 00:08:10,410 --> 00:08:16,250 So and then we can actually execute these lines of code and then it reaches the end in calibrates of 135 00:08:16,250 --> 00:08:17,600 this method. 136 00:08:17,780 --> 00:08:22,850 And it going to actually output those values to the screen as you can see these are the values. 137 00:08:22,850 --> 00:08:23,510 OK. 138 00:08:23,930 --> 00:08:30,280 So now the second time that the user clicks on this button as you can see here now again it's going 139 00:08:30,280 --> 00:08:33,040 to actually go inside of this method. 140 00:08:33,200 --> 00:08:37,900 And again it's going to check this condition if first time value bet is true. 141 00:08:38,210 --> 00:08:41,420 So as you can see here we assign the value falls to this valuable. 142 00:08:41,450 --> 00:08:47,810 So now when we when we actually click on this button the value of this first thing valuable is false. 143 00:08:47,810 --> 00:08:54,650 So it's not going to actually execute this if statement here and it is going to only execute like these 144 00:08:54,650 --> 00:08:55,460 lines of code here. 145 00:08:55,460 --> 00:08:56,180 OK. 146 00:08:56,570 --> 00:09:01,950 As you can see here we could even actually put these lines of code inside of this if statements. 147 00:09:01,960 --> 00:09:04,000 So let's actually delete this. 148 00:09:04,410 --> 00:09:09,480 And in calibrates of this if statement as you can see here and we could actually put it here. 149 00:09:09,500 --> 00:09:11,610 After these lines of code here. 150 00:09:12,250 --> 00:09:15,290 And let's actually do our project again and see what happens. 151 00:09:15,290 --> 00:09:20,290 So as you can see here now our application is actually running on this emulator. 152 00:09:20,300 --> 00:09:24,210 So let's actually click on the spot in here and let's see what happens. 153 00:09:24,350 --> 00:09:26,470 As you can see now these values are here. 154 00:09:26,690 --> 00:09:28,760 And let's actually click on this button again. 155 00:09:29,180 --> 00:09:31,770 Now as you can see these values don't change any more. 156 00:09:31,820 --> 00:09:32,720 OK. 157 00:09:33,140 --> 00:09:35,230 So hopefully that makes sense. 158 00:09:35,390 --> 00:09:38,220 And there is another solution to this problem.