1 00:00:00,210 --> 00:00:06,480 So now I'm going to pasting some lines of code here inside this class and then I'm going to explain 2 00:00:06,480 --> 00:00:07,930 to you what's going on here. 3 00:00:08,070 --> 00:00:13,050 So before the end in curly brace of this class here as you can see this is the end in equilibrate of 4 00:00:13,050 --> 00:00:13,710 this class. 5 00:00:13,710 --> 00:00:18,120 So before the end in curly braces this class I'm going to paste in these lines of code here. 6 00:00:18,240 --> 00:00:24,900 So as you can see here these are the lines of code that I pasted here and now I'm going to explain to 7 00:00:24,900 --> 00:00:26,810 you what's going on here. 8 00:00:26,850 --> 00:00:28,320 Exactly. 9 00:00:28,350 --> 00:00:30,540 So now let's actually look at this method. 10 00:00:30,540 --> 00:00:32,270 Here we have our method right. 11 00:00:32,400 --> 00:00:36,370 And now as you can see here the axis of this method is public. 12 00:00:36,660 --> 00:00:39,840 The return type of the Smurfette is void. 13 00:00:39,930 --> 00:00:44,580 The name of the Smurfit is modify animals guess Rose as you can see here. 14 00:00:44,910 --> 00:00:51,750 And this method actually accepts one argument of type shared preferences and the name of this argument 15 00:00:51,750 --> 00:00:53,210 is shared preferences. 16 00:00:53,220 --> 00:00:53,920 Right. 17 00:00:54,000 --> 00:00:59,550 So now as you can see here let's go inside the curly braces of the Smurfette And let's see what's going 18 00:00:59,550 --> 00:01:03,450 on here in line number three hundred and eighty nine as you can see. 19 00:01:03,570 --> 00:01:10,030 We have actually a constant and the name as he has here that data type of this constant is string. 20 00:01:10,260 --> 00:01:15,460 And the name of our constant is actually number of guest options. 21 00:01:15,690 --> 00:01:20,620 So here as you can see we have a constant that can hold of idea of type string. 22 00:01:20,640 --> 00:01:20,970 Right. 23 00:01:21,000 --> 00:01:24,030 So final strange number of options. 24 00:01:24,180 --> 00:01:31,230 Assignment operator and that I referred to the name of this actually to the name of this argument shared 25 00:01:31,230 --> 00:01:34,380 preferences that get strange. 26 00:01:34,630 --> 00:01:39,620 And now as you can see here I am actually referring to this guess as to this case is here. 27 00:01:39,780 --> 00:01:41,350 So this case is here. 28 00:01:41,430 --> 00:01:47,130 Actually first to this guess Chih that we have inside this main activity class. 29 00:01:47,280 --> 00:01:47,680 Right. 30 00:01:47,760 --> 00:01:51,020 So analysis I should go inside this main activity fragment that of a fight here. 31 00:01:51,030 --> 00:01:57,620 So now let's just type in main activity that classes are now in this. 32 00:01:57,690 --> 00:02:02,850 You can understand that we are referring to this this is key that we have inside this main activity 33 00:02:02,850 --> 00:02:04,130 that double wide. 34 00:02:04,140 --> 00:02:10,820 So this here this constant actually holds this key settings underline number of guesses. 35 00:02:10,830 --> 00:02:13,770 So now if we actually go inside. 36 00:02:14,040 --> 00:02:16,140 Actually let me show you the structure of the project. 37 00:02:16,140 --> 00:02:21,490 So just click on View and then tool windows and then click on Project. 38 00:02:21,720 --> 00:02:28,500 And now it's actually double click on this red folder and then let's go inside this values folder and 39 00:02:28,500 --> 00:02:34,680 here as you can see we have these XML files and now let's actually double click on this XML file here 40 00:02:34,710 --> 00:02:40,620 as you can see the DoubleClick and the xml folder and then double click and the squeeze underline preferences 41 00:02:40,620 --> 00:02:41,970 that exemplified. 42 00:02:42,420 --> 00:02:47,460 And now it's actually double click on this a tab here quis underlying preferences that exemplified in 43 00:02:47,460 --> 00:02:51,410 order to act in order to actually make it make this area Vider. 44 00:02:51,870 --> 00:02:56,530 So as you can see here inside this file we have actually a list preference right. 45 00:02:56,880 --> 00:03:01,680 And this is preferencial actually holds the number of guest list as you can see here. 46 00:03:02,010 --> 00:03:08,940 And the key is settings underline number of guesses and the title is as I see it as you can see here 47 00:03:09,150 --> 00:03:10,240 number of cases total. 48 00:03:10,260 --> 00:03:14,730 And if I actually hold up the comment the comment on my keyboard as you can see here and then click 49 00:03:14,730 --> 00:03:19,790 on the title here as you can see it's a number of guesses right inside strings that exemplified. 50 00:03:20,430 --> 00:03:25,260 And let's go back into our Q Is Underland preference is that exemplified and here as you can see the 51 00:03:25,260 --> 00:03:31,070 summary is this values Schu show two four or six gives options. 52 00:03:31,060 --> 00:03:37,650 And now if I show you the emulator and if I actually go inside the settings but activity here as you 53 00:03:37,650 --> 00:03:41,300 can see now if I actually click on this number of guesses here. 54 00:03:41,820 --> 00:03:46,350 Now it says that we have actually two four or six options. 55 00:03:46,350 --> 00:03:49,130 So here we have actually a typo number. 56 00:03:49,140 --> 00:03:53,180 So now let's actually hold the comment here on the keyboard. 57 00:03:53,190 --> 00:03:58,110 If you are using a Windows machine just hold the control on your keyboard and then click on this title 58 00:03:58,110 --> 00:03:58,730 here. 59 00:03:58,830 --> 00:04:02,410 As you can see we didn't actually put the are chelator here. 60 00:04:02,410 --> 00:04:06,660 So a number of guesses right now is actually on our project again. 61 00:04:07,860 --> 00:04:12,080 And now let's get you to go back into our quiz underlying preferences that examined by. 62 00:04:12,330 --> 00:04:17,640 So now as you can see we have this preference yet and a persistent is true. 63 00:04:17,760 --> 00:04:26,170 And this means that it can actually save our changes into their shared preferences file. 64 00:04:26,430 --> 00:04:30,100 Inside our Android device and the default value is number four. 65 00:04:30,360 --> 00:04:36,660 And this means that the default value of just options is four and we are going to have Fortius options 66 00:04:37,050 --> 00:04:41,170 for our quiz if we don't specify our value for this. 67 00:04:41,190 --> 00:04:42,870 Actually for this this preference. 68 00:04:42,870 --> 00:04:44,550 So now let me show you the emulator here. 69 00:04:44,550 --> 00:04:47,190 As you can see now it says number of guesses. 70 00:04:47,220 --> 00:04:54,170 And if I click on it now for example if I want to actually for example if I select is 6 here I want 71 00:04:54,180 --> 00:05:00,280 when I actually click on back button here I want to have for example says six gives options right. 72 00:05:00,330 --> 00:05:05,150 Now let's actually click on this setting's activity and this number of guesses here and here. 73 00:05:05,160 --> 00:05:10,350 If I actually click on this for example to here two number of cases and then click click on this patch 74 00:05:10,350 --> 00:05:11,190 with and here. 75 00:05:11,190 --> 00:05:12,850 Are you going to have two number of guesses. 76 00:05:12,870 --> 00:05:13,200 Right. 77 00:05:13,200 --> 00:05:14,580 Not six. 78 00:05:14,580 --> 00:05:17,540 So we need to actually provide some logic for this. 79 00:05:17,550 --> 00:05:19,510 So here we have this list preference. 80 00:05:19,680 --> 00:05:22,950 And the key is settings underline number of guesses. 81 00:05:23,100 --> 00:05:25,680 Inside is an activity of a fight as you can see here. 82 00:05:25,680 --> 00:05:32,650 We created this color this constant here in say this main activity class and the key is guesses. 83 00:05:32,820 --> 00:05:38,640 And then I put an assignment operator here and this this is actually the key settings on the number 84 00:05:38,640 --> 00:05:39,270 of cases. 85 00:05:39,270 --> 00:05:43,650 So we assigned this value to these constants so that we can actually refers to this constant in order 86 00:05:43,650 --> 00:05:45,270 to access this value. 87 00:05:45,540 --> 00:05:48,380 Inciters main activity affreightment our job here. 88 00:05:48,400 --> 00:05:56,280 I want to actually provide this actually this logic here in order to allow the user to actually specify 89 00:05:56,460 --> 00:06:00,700 the number of guest options that he or she wants to have inside the quiz. 90 00:06:01,110 --> 00:06:07,180 So now as you can see this method actually accepts an argument of type shirt preferences right. 91 00:06:07,320 --> 00:06:14,220 So has preferences that jet stream main activity so this if it gets through in here actually sits two 92 00:06:14,220 --> 00:06:15,180 arguments right. 93 00:06:15,180 --> 00:06:18,120 The first one is that actually the key. 94 00:06:18,370 --> 00:06:21,220 So main activity that just that guess is as you can see here. 95 00:06:21,230 --> 00:06:26,820 So in this way we can actually access this list preference that we have inside this quiz underlying 96 00:06:26,870 --> 00:06:32,180 preferences that is similar in this way by actually reading what is key that you specified here. 97 00:06:32,240 --> 00:06:39,840 We can actually access this this this list preference and then we can actually get the value that we 98 00:06:39,840 --> 00:06:42,750 get from this actually from these radio buttons. 99 00:06:42,750 --> 00:06:45,180 So as you can see here let me show you the emulator. 100 00:06:45,180 --> 00:06:51,000 So for example if I go inside this setting's activity here and then click on the number of guesses here. 101 00:06:51,150 --> 00:06:54,070 As you can see we have number two four or six. 102 00:06:54,300 --> 00:06:59,610 So when I say let's actually go back into our main activity fragment of a fight here. 103 00:06:59,640 --> 00:07:02,850 When I say share preferences that get strange. 104 00:07:02,880 --> 00:07:05,640 So it can actually give us a string value right. 105 00:07:05,880 --> 00:07:11,190 And now as you can see here in say this quiz underling preference is that exemplified the default value 106 00:07:11,190 --> 00:07:14,600 is number four right inside the double quotes as you can see here. 107 00:07:14,610 --> 00:07:15,040 Right. 108 00:07:15,180 --> 00:07:19,740 So this is going to be osting value right because this value is inside double quotes. 109 00:07:19,740 --> 00:07:24,640 So inside this way activity fragment that of a file when I say share preferences that gets three is 110 00:07:24,670 --> 00:07:26,280 going to give us a string value. 111 00:07:26,310 --> 00:07:28,430 First I need to specify the key. 112 00:07:28,620 --> 00:07:36,420 So the key is main activity that guesses right main activity that guesses and now the second argument 113 00:07:36,420 --> 00:07:36,870 is not. 114 00:07:36,870 --> 00:07:40,840 So now let me ask you to call this method here again in order to show you the second argument. 115 00:07:40,920 --> 00:07:44,450 So shares preferences that get strange 116 00:07:47,280 --> 00:07:50,370 and now as you can see here that's the first argument is key. 117 00:07:50,500 --> 00:07:53,320 And the second argument is the default value. 118 00:07:53,320 --> 00:07:54,180 Right. 119 00:07:54,670 --> 00:08:00,850 So here inside this quiz preference preferences that example I actually specified the default value 120 00:08:00,850 --> 00:08:01,350 here. 121 00:08:01,450 --> 00:08:04,920 So I don't need to provide a default value here again. 122 00:08:04,930 --> 00:08:08,690 So I actually assign the value null for the second argument. 123 00:08:08,710 --> 00:08:11,920 So let me read this line of code here. 124 00:08:11,950 --> 00:08:14,970 So now let's look at this line of code here again. 125 00:08:15,040 --> 00:08:20,680 So we have a constant the data type of this constant is strange the name of this constant is number 126 00:08:20,680 --> 00:08:21,920 of options. 127 00:08:21,940 --> 00:08:27,100 So this constant is going to hold the number of options that we use that actually specifies. 128 00:08:27,200 --> 00:08:30,310 So assignment operator shares preferences. 129 00:08:30,340 --> 00:08:33,850 So you can actually go inside the shared preferences that jet stream. 130 00:08:33,860 --> 00:08:39,630 So it's going to actually get a string value and then it's going to actually pass the CI. 131 00:08:39,700 --> 00:08:44,890 So because you want to actually get the number of just options as you can see here we need to pass the 132 00:08:44,890 --> 00:08:48,210 key the key of this actually list this reference. 133 00:08:48,220 --> 00:08:53,440 If I can say this squeeze Underland preferences that exemplified you can see that because I want to 134 00:08:53,440 --> 00:08:59,110 get the value of this this preference right because these are actually radio buttons in say the radio 135 00:08:59,120 --> 00:09:01,300 group we can only select one of them right. 136 00:09:01,390 --> 00:09:07,300 So when I say get strange is going to actually only give us one of these values to four or six. 137 00:09:07,360 --> 00:09:07,950 Right. 138 00:09:08,020 --> 00:09:15,550 So now if I go back into our main activity fragment of a file you can see that I passed this key in 139 00:09:15,550 --> 00:09:21,160 order to access that list preference and for the default value I passed the value null because inside 140 00:09:21,160 --> 00:09:26,500 this quiz Underland preferences that exemplified for this this preference here as you can see here for 141 00:09:26,500 --> 00:09:31,570 these key settings underline number of cases I specified a default value. 142 00:09:31,570 --> 00:09:32,620 Number four. 143 00:09:32,680 --> 00:09:36,510 So now let's actually go back into our main activity fragment out of a file. 144 00:09:36,910 --> 00:09:42,830 So here now this string constant actually holds the number of options. 145 00:09:42,880 --> 00:09:48,170 For example 2 4 or 6 because we are actually getting that value from these shared preferences. 146 00:09:48,370 --> 00:09:52,070 So if you look at this quiz Underland preferences are exemplified here. 147 00:09:52,090 --> 00:09:58,780 When we assign the value true to this persistent attribute of we actually said to the computer to our 148 00:09:58,840 --> 00:10:03,900 Android device to actually save those changes to the shared preferences. 149 00:10:03,910 --> 00:10:09,590 So when I actually referred to this shared preference I can't get that specific value right. 150 00:10:09,670 --> 00:10:16,240 So Shetterly that gets trencherman activity that us and for the second argument null and then in line 151 00:10:16,240 --> 00:10:21,670 number three hundred and ninety one as you can see here I actually referred to this valuable number 152 00:10:21,670 --> 00:10:23,340 of animals guestrooms. 153 00:10:23,350 --> 00:10:29,200 So now if I actually scroll to the top here inside this class as you can see we actually created this 154 00:10:29,200 --> 00:10:35,890 variable here in line number 55 and disvalue is actually that integer and the name is number of animals 155 00:10:35,890 --> 00:10:36,660 get throws. 156 00:10:36,790 --> 00:10:43,500 So this value is supposed to hold the number of guests throws that we are going to have in say the quiz. 157 00:10:43,510 --> 00:10:49,230 So now let's actually scroll down here and now as you can see here insight is actually inside the Smurfette 158 00:10:49,240 --> 00:10:51,980 modify animals guess throws. 159 00:10:52,030 --> 00:10:57,810 I am actually initialising despite the overall number of animals just throws assignment operator. 160 00:10:58,060 --> 00:11:04,150 So now as you can see here we need to actually convert because as you can see here we're actually getting 161 00:11:04,150 --> 00:11:06,510 this value as a string value right. 162 00:11:06,520 --> 00:11:10,900 We need to convert that value to an integer value so that we can actually use it. 163 00:11:10,900 --> 00:11:17,110 Inside our quiz so that we can actually tell the actual main activity here that we are going to have 164 00:11:17,110 --> 00:11:22,090 for example six throws or four guess throws or for example two guesses. 165 00:11:22,120 --> 00:11:22,640 That's bad. 166 00:11:22,640 --> 00:11:25,490 You must be an integer value right. 167 00:11:25,540 --> 00:11:31,810 So now as you can see because these values are actually string values when we want to get these values 168 00:11:31,810 --> 00:11:34,230 here we are actually getting them as a string to. 169 00:11:34,240 --> 00:11:36,660 For example two or four or six. 170 00:11:36,670 --> 00:11:37,960 We need to convert them. 171 00:11:37,960 --> 00:11:42,590 We need to convert those values actually to an integer value for example the value is too right. 172 00:11:42,640 --> 00:11:45,280 We need to convert that number to an integer value. 173 00:11:45,370 --> 00:11:47,190 So integer that parse. 174 00:11:47,210 --> 00:11:48,430 Int. 175 00:11:48,680 --> 00:11:52,880 And then we need to pass this thing value that you're going to convert it to actually to an integer 176 00:11:52,890 --> 00:11:57,130 reduce the number of options as you can see here divided by two. 177 00:11:57,140 --> 00:11:59,760 Why did I divide this value by two. 178 00:11:59,780 --> 00:12:00,650 Why do they do that. 179 00:12:00,650 --> 00:12:01,680 Just think about that. 180 00:12:01,730 --> 00:12:04,960 And then we're going to talk about this line of thought here.