1 00:00:00,480 --> 00:00:06,620 So as you can see here now our application is actually running on this emulator and the value of this 2 00:00:06,630 --> 00:00:10,280 true and false valuable is actually false. 3 00:00:10,290 --> 00:00:12,340 So this checkbox is actually checked. 4 00:00:12,480 --> 00:00:13,040 OK. 5 00:00:13,230 --> 00:00:19,820 So as you can see here first of all we actually created a boolean variable called true and false and 6 00:00:19,860 --> 00:00:23,190 we find a boolean expression with this variable. 7 00:00:23,190 --> 00:00:24,690 True and false. 8 00:00:24,900 --> 00:00:28,960 So the result of this expression is going to be assigned to this valuable. 9 00:00:29,100 --> 00:00:35,990 So true and false actually results in a false value so that false value is going to be assigned to this 10 00:00:36,000 --> 00:00:36,730 variable. 11 00:00:36,900 --> 00:00:43,710 And here we are actually saying that if the value of this true and false bet is true then execute this 12 00:00:43,710 --> 00:00:44,730 line of code. 13 00:00:44,920 --> 00:00:50,170 And if the value of the is true and false variable is false. 14 00:00:50,400 --> 00:00:52,890 Ok then execute this line of code here. 15 00:00:52,890 --> 00:00:57,860 So as you can see here it is now actually executing this line of code here because the value of this 16 00:00:57,870 --> 00:01:00,240 true and false value is false. 17 00:01:00,240 --> 00:01:02,370 So this checkbox is actually checked. 18 00:01:02,370 --> 00:01:04,550 So hopefully that makes sense again. 19 00:01:04,560 --> 00:01:09,990 Let's actually comment out these lines of code here because I want to show you another way of actually 20 00:01:09,990 --> 00:01:16,150 writing these statements so I can just I can see X true and false. 21 00:01:16,290 --> 00:01:17,120 Yes. 22 00:01:17,280 --> 00:01:24,990 That said checked and then I can't just put in a pair of round brackets here in order to create a boolean 23 00:01:24,990 --> 00:01:25,780 expression. 24 00:01:25,780 --> 00:01:30,120 So true and false exclamation mark. 25 00:01:30,130 --> 00:01:32,450 True otherwise false. 26 00:01:32,550 --> 00:01:34,440 And these are boolean expression. 27 00:01:34,440 --> 00:01:40,530 This boolean expression means if the value of these true and false is true. 28 00:01:40,780 --> 00:01:46,780 OK if the value that is assigned to this are true and false value but is true then assigned a value 29 00:01:46,800 --> 00:01:50,090 true to dismiss it said checked that is related to this. 30 00:01:50,110 --> 00:01:51,980 C see X true and false. 31 00:01:51,990 --> 00:01:52,800 Yes. 32 00:01:52,830 --> 00:01:55,620 So as you can see here this is that R component. 33 00:01:55,740 --> 00:01:56,420 OK. 34 00:01:56,850 --> 00:02:05,190 And otherwise if the value of this true and false variable is actually false then assigned a value false 35 00:02:05,190 --> 00:02:08,700 to this set text Meffert that is actually related to this. 36 00:02:08,820 --> 00:02:10,940 To this C H x true and false. 37 00:02:11,130 --> 00:02:11,480 Yes. 38 00:02:11,490 --> 00:02:15,610 So as you can see here now this checkbox is checked off. 39 00:02:15,860 --> 00:02:16,510 OK. 40 00:02:16,530 --> 00:02:18,060 So hopefully that makes sense. 41 00:02:18,060 --> 00:02:24,150 So here let's actually type in again see X true and false. 42 00:02:24,150 --> 00:02:26,490 No Dot said checked. 43 00:02:26,610 --> 00:02:29,530 And then let's actually put in a pair of round brackets here. 44 00:02:29,700 --> 00:02:38,100 So I can just type in not true and false and this means this means that if the value of this true and 45 00:02:38,100 --> 00:02:44,650 false variable is false then assign the value true to this set check Smurfette. 46 00:02:44,700 --> 00:02:49,630 Otherwise assign the value false to this set checked method. 47 00:02:49,770 --> 00:02:54,160 So here as you can see first of all I put in an exclamation mark here. 48 00:02:54,170 --> 00:02:56,800 In order to negate that value. 49 00:02:56,820 --> 00:03:03,510 So if the value of this true and false variable is false then assign the value true to this to the said 50 00:03:03,510 --> 00:03:04,480 checked Meffert. 51 00:03:04,530 --> 00:03:09,040 There is actually related to this see X true and false no. 52 00:03:09,180 --> 00:03:15,320 As you can see here now it is actually assigning the value true to this checkbox as you can see otherwise 53 00:03:15,640 --> 00:03:22,500 assign the value false to this set checked Meffert that is related to this C is x true and false no 54 00:03:22,800 --> 00:03:23,570 object. 55 00:03:23,670 --> 00:03:27,840 OK so as you can see here now is actually a checkbox is actually checked. 56 00:03:27,840 --> 00:03:33,840 So that's why we actually see this checkbox is actually checked because the value of this true and false 57 00:03:33,840 --> 00:03:35,720 variable is actually false. 58 00:03:35,730 --> 00:03:37,900 This expression evaluates to false. 59 00:03:37,920 --> 00:03:41,690 Ok true and false evaluates to false. 60 00:03:41,790 --> 00:03:42,360 OK. 61 00:03:42,570 --> 00:03:44,210 So hopefully that makes sense. 62 00:03:44,250 --> 00:03:44,740 OK. 63 00:03:44,790 --> 00:03:46,470 So hopefully that makes sense. 64 00:03:46,680 --> 00:03:49,580 And let's actually go back inside our code here. 65 00:03:50,100 --> 00:03:56,190 And let's actually go inside this content underline minute example and let's actually try again a linearly 66 00:03:56,200 --> 00:03:57,190 out horizontal. 67 00:03:57,190 --> 00:04:04,490 Inside this actually is linearly out vertical and then dragging a large takes you inside. 68 00:04:04,480 --> 00:04:07,070 These are linearly out horizontal. 69 00:04:07,230 --> 00:04:10,870 OK just put it inside this linear lay out horizontal here. 70 00:04:10,950 --> 00:04:13,970 You can actually put it directly inside the screen. 71 00:04:13,980 --> 00:04:20,250 So if you just want to click on these are large stakes here you can just put it inside this linearly 72 00:04:20,280 --> 00:04:25,770 out here as you can see now the color of this linearly ultra horizontal is orange. 73 00:04:25,770 --> 00:04:28,820 So let's actually double click on this large takes you here. 74 00:04:29,220 --> 00:04:36,960 And for the text of this text you just type in here false and true. 75 00:04:37,500 --> 00:04:43,150 And as I said before we don't need to actually interact with this component from our Java code. 76 00:04:43,170 --> 00:04:46,740 So we don't need to actually assign an ID to this text view. 77 00:04:46,920 --> 00:04:52,170 And then it's actually putting a checkbox into this or linearly or horizontally. 78 00:04:52,230 --> 00:04:54,830 So as you can see here we've got this checkbox here. 79 00:04:54,990 --> 00:05:02,170 Just put it here and then double click on this checkbox and for the sixth just type in here yes. 80 00:05:02,560 --> 00:05:09,940 And for the ID just type in here see x false and true. 81 00:05:11,050 --> 00:05:12,390 Yes. 82 00:05:13,480 --> 00:05:20,650 And let's actually dragging another checkbox into this linearly or horizontal and double click on this 83 00:05:20,920 --> 00:05:22,870 checkbox here for the text. 84 00:05:22,870 --> 00:05:24,340 Just type in here no. 85 00:05:24,580 --> 00:05:31,410 And for the ID just type in C H x files and true. 86 00:05:32,620 --> 00:05:33,710 No. 87 00:05:34,440 --> 00:05:34,880 OK. 88 00:05:34,930 --> 00:05:36,640 OK so hopefully that makes sense. 89 00:05:36,640 --> 00:05:42,770 So let's actually click on this linearly or horizontal here and then let's actually click on this linearly 90 00:05:42,780 --> 00:05:44,350 and horizontal here. 91 00:05:44,350 --> 00:05:46,880 And let's actually find the gravity attributes. 92 00:05:47,200 --> 00:05:52,830 And let's actually check this check box here that says Center underline horizontal. 93 00:05:52,890 --> 00:05:53,440 OK. 94 00:05:53,470 --> 00:05:55,800 So it's going to actually center of this. 95 00:05:55,870 --> 00:06:02,560 These components that are inside this linearly are horizontal horizontally inside these linear left. 96 00:06:02,670 --> 00:06:03,270 OK. 97 00:06:03,460 --> 00:06:05,680 So hopefully that makes sense. 98 00:06:05,680 --> 00:06:10,780 And let's actually go back and say this main activity that you have a fight here and here I can actually 99 00:06:10,780 --> 00:06:15,180 create a comment Fulks aren't true. 100 00:06:15,190 --> 00:06:23,400 So let's actually create two checkbox objects so checkbox see X fonts aren't true. 101 00:06:24,100 --> 00:06:25,440 Yes. 102 00:06:25,610 --> 00:06:33,820 Assignment operator checkbox here as you can see I am actually casting this object into a checkbox object 103 00:06:33,820 --> 00:06:40,370 in order to let the compiler know that I am actually working with a checkbox object not a view object. 104 00:06:40,390 --> 00:06:50,470 OK so find view by id r that ID that C H x false and true. 105 00:06:50,830 --> 00:06:51,830 Yes. 106 00:06:52,350 --> 00:06:53,400 OK. 107 00:06:53,530 --> 00:07:01,200 Again I need to create another checkbox object C as X Files and true no. 108 00:07:01,210 --> 00:07:11,170 So here I need to cast this object to a checkbox object find view by id r that Id dot see x x false 109 00:07:11,950 --> 00:07:14,610 and true no. 110 00:07:15,130 --> 00:07:17,920 OK so hopefully that makes sense. 111 00:07:18,010 --> 00:07:21,470 And here let's actually interact with these objects. 112 00:07:21,670 --> 00:07:23,410 So let's actually create a comment here. 113 00:07:23,430 --> 00:07:25,530 Fonts aren't true. 114 00:07:25,660 --> 00:07:26,480 OK. 115 00:07:27,100 --> 00:07:34,480 And here let's actually create a boolean value by a boolean false and true. 116 00:07:35,170 --> 00:07:40,510 And then let's actually put in an assignment operator here and then actually putting a pair of round 117 00:07:40,570 --> 00:07:46,050 brackets here False and True. 118 00:07:46,280 --> 00:07:46,520 OK. 119 00:07:46,540 --> 00:07:52,870 As you can see I assigned this expression this boolean expression to this boolean valuable. 120 00:07:53,050 --> 00:07:55,010 So here I am actually saying that. 121 00:07:55,320 --> 00:08:01,270 So here as you can see if the value of this expression is true that true value is going to be assigned 122 00:08:01,540 --> 00:08:07,960 to this variable or if the value of this expression is false that false value is going to be assigned 123 00:08:07,960 --> 00:08:10,080 to this value but ok false and true. 124 00:08:10,090 --> 00:08:13,260 So here I can just create an if else statement here. 125 00:08:13,270 --> 00:08:18,260 So if the value of this false and true variable is true. 126 00:08:18,660 --> 00:08:27,310 OK as you can see here I am saying that if the value of these false and true variable is true then execute 127 00:08:27,370 --> 00:08:31,200 this line of cohered see X for us and true. 128 00:08:31,450 --> 00:08:34,420 Yes that said check it. 129 00:08:34,530 --> 00:08:35,050 True. 130 00:08:35,290 --> 00:08:35,670 OK. 131 00:08:35,670 --> 00:08:42,720 Otherwise else if the value of these funds and true variable is false. 132 00:08:42,760 --> 00:08:43,300 OK. 133 00:08:43,390 --> 00:08:48,680 So exclamation mark false and true. 134 00:08:49,360 --> 00:08:51,250 Then execute this line of code here. 135 00:08:51,250 --> 00:08:54,600 Inside the inside of this curly braces C S C H. 136 00:08:54,610 --> 00:08:56,020 X files. 137 00:08:56,330 --> 00:08:59,670 And to no that said check checked. 138 00:08:59,680 --> 00:09:00,650 True. 139 00:09:01,330 --> 00:09:02,030 OK. 140 00:09:02,080 --> 00:09:04,860 So let's actually run our project and see what happens. 141 00:09:04,960 --> 00:09:05,290 OK. 142 00:09:05,290 --> 00:09:10,270 As you can see now the value of this false and true variable is false. 143 00:09:10,270 --> 00:09:12,210 So this checkbox is actually checked. 144 00:09:12,280 --> 00:09:12,610 OK. 145 00:09:12,610 --> 00:09:13,080 No. 146 00:09:13,210 --> 00:09:19,670 So as you can see here the first level created a boolean variable here named false and true. 147 00:09:20,140 --> 00:09:22,970 And then we assign this expression to our variable. 148 00:09:22,970 --> 00:09:24,690 False and True. 149 00:09:24,760 --> 00:09:28,640 So the result of this expression is going to be assigned to this valuable. 150 00:09:28,810 --> 00:09:31,690 And here we actually created an if else statement. 151 00:09:31,750 --> 00:09:37,970 If the value of this false and true value is true then execute this line of code. 152 00:09:38,260 --> 00:09:43,550 And and else if the value of this false and true variable is not true. 153 00:09:43,630 --> 00:09:46,940 So it is false then execute this line of code here. 154 00:09:46,960 --> 00:09:49,910 So as you can see here the value of this variable is false. 155 00:09:50,020 --> 00:09:52,700 So it is actually executing this line of code here. 156 00:09:52,890 --> 00:09:53,380 OK.