1 00:00:00,390 --> 00:00:05,160 And let's actually create an object from disparate class inside this main activity that you will fight 2 00:00:05,160 --> 00:00:05,710 here. 3 00:00:05,920 --> 00:00:10,890 Well OK here let's actually create an object from this bird class. 4 00:00:10,890 --> 00:00:17,670 So first I need to refer to the name of this birth class my birth and I put an assignment operator here. 5 00:00:17,730 --> 00:00:26,830 Neil Baird and now I need to actually passing somebody else first I need to specify the name of my object. 6 00:00:26,940 --> 00:00:33,870 For example my birth and say Can I need to actually specify the color of my bird. 7 00:00:33,870 --> 00:00:42,930 For example white comma and now I need to actually specify the amount of speed of my bird for example 8 00:00:43,140 --> 00:00:49,280 600 Kamaal and now I need to actually specify the amount of power of my bed. 9 00:00:49,290 --> 00:00:51,880 For example 20 comma. 10 00:00:52,380 --> 00:00:56,530 And now I need to actually specify that whether my bird can fly or not. 11 00:00:56,580 --> 00:00:58,310 OK so true. 12 00:00:58,600 --> 00:00:59,350 Comma. 13 00:00:59,550 --> 00:01:04,460 And now I need to specify the number of blinks of my birth to. 14 00:01:04,830 --> 00:01:08,540 And I need to actually put in a semi-colon at the end of my statement. 15 00:01:08,580 --> 00:01:16,280 So now I can just type in here anti-X the beard that said text and in inside the prentices I can just 16 00:01:16,280 --> 00:01:20,590 refers to the name of this birth object my birth that's too strange. 17 00:01:21,080 --> 00:01:21,750 OK. 18 00:01:21,900 --> 00:01:23,650 So hopefully that makes sense. 19 00:01:23,730 --> 00:01:28,650 And let's actually run our project and see what happens because now I want to actually to show you another 20 00:01:28,650 --> 00:01:31,810 important point about our XML files. 21 00:01:31,830 --> 00:01:32,220 OK. 22 00:01:32,250 --> 00:01:32,800 OK. 23 00:01:32,850 --> 00:01:39,990 Now as you can see our plunged on this emulator here but we cannot see the values that are related to 24 00:01:39,990 --> 00:01:40,480 this. 25 00:01:40,500 --> 00:01:41,780 My first object here. 26 00:01:41,790 --> 00:01:42,390 OK. 27 00:01:42,660 --> 00:01:43,980 So what's going on here. 28 00:01:44,160 --> 00:01:51,190 Now we need to actually change some attributes that are related to the components of this screen here. 29 00:01:51,240 --> 00:01:52,000 OK. 30 00:01:52,440 --> 00:01:58,080 So let's actually go inside this content underline means that I mean here and now I want to actually 31 00:01:58,590 --> 00:02:04,810 talk about the weight attributes which is of very important attributes in exemplifies. 32 00:02:04,830 --> 00:02:05,500 OK. 33 00:02:05,820 --> 00:02:08,960 So let's actually select all of these components here. 34 00:02:09,000 --> 00:02:11,750 Other insight is exemplified here. 35 00:02:11,760 --> 00:02:17,510 All of these takes the view of components and let's actually find derivative weight attribute here. 36 00:02:17,540 --> 00:02:21,990 OK so now let's actually open the calculator. 37 00:02:21,990 --> 00:02:25,850 And now let's actually divide number one by five. 38 00:02:25,860 --> 00:02:26,450 OK. 39 00:02:26,520 --> 00:02:31,040 One divided by five zero point two. 40 00:02:31,050 --> 00:02:31,660 OK. 41 00:02:31,770 --> 00:02:34,050 So let's actually put this value here. 42 00:02:34,050 --> 00:02:37,720 Zero point two. 43 00:02:37,900 --> 00:02:43,140 OK so now let's actually reduce the margin of these components here. 44 00:02:43,170 --> 00:02:46,680 Inside the screen here for example 5. 45 00:02:46,920 --> 00:02:51,720 And let's actually reduce the padding of these takes three components here. 46 00:02:51,900 --> 00:02:54,450 And let's actually to change this value to 5. 47 00:02:54,740 --> 00:02:55,540 OK. 48 00:02:56,010 --> 00:02:59,730 And now let's actually go on our project and see what happens. 49 00:02:59,730 --> 00:03:05,060 So as you can see here now are these values are outputted to the screen here. 50 00:03:05,090 --> 00:03:09,870 OK the values that are related to the birth object is outputted here. 51 00:03:09,960 --> 00:03:17,800 A name might birth color white speed 600 power 20 fly true and number of beings. 52 00:03:17,930 --> 00:03:24,870 OK so you may wonder that what did you do here in this exemplified in order to show these actualities 53 00:03:24,930 --> 00:03:26,210 values to the screen. 54 00:03:26,350 --> 00:03:30,000 Let's actually talk a little bit about the vate attributes. 55 00:03:30,030 --> 00:03:33,420 That is a very important attribute in exemplifies. 56 00:03:33,440 --> 00:03:33,770 OK. 57 00:03:33,780 --> 00:03:37,930 And you need to actually use this attribute in all of your projects. 58 00:03:37,950 --> 00:03:38,440 OK. 59 00:03:38,610 --> 00:03:40,900 So let's actually doubleclick on this content. 60 00:03:40,920 --> 00:03:42,310 Underline that it's a man. 61 00:03:42,390 --> 00:03:45,500 So now as you can see we've got this vate attributes here. 62 00:03:45,660 --> 00:03:46,220 OK. 63 00:03:46,410 --> 00:03:47,050 I first. 64 00:03:47,060 --> 00:03:47,730 Divided. 65 00:03:47,730 --> 00:03:48,620 Number one. 66 00:03:48,750 --> 00:03:50,900 So here I actually divide it. 67 00:03:50,910 --> 00:03:53,620 Number one by number five. 68 00:03:53,760 --> 00:03:54,200 OK. 69 00:03:54,240 --> 00:03:55,770 So why did they do that. 70 00:03:55,770 --> 00:03:57,710 Because as you can see here. 71 00:03:57,960 --> 00:03:58,460 OK. 72 00:03:58,560 --> 00:04:02,640 So now as you can see here I assumed the height of the screen is 1. 73 00:04:02,670 --> 00:04:03,370 OK. 74 00:04:03,720 --> 00:04:08,960 And I wanted to actually put five components inside this screen here. 75 00:04:08,970 --> 00:04:09,560 OK. 76 00:04:09,630 --> 00:04:18,090 So I decided to actually divide number 1 which is the height of the screen by number 5 and the value 77 00:04:18,090 --> 00:04:19,120 is 0.2. 78 00:04:19,140 --> 00:04:19,650 OK. 79 00:04:19,830 --> 00:04:22,720 So as you can see here we've got five takes three balls here. 80 00:04:22,890 --> 00:04:23,380 OK. 81 00:04:23,430 --> 00:04:28,500 And I want to actually put these five takes to use here inside this screen here. 82 00:04:28,500 --> 00:04:33,000 And because we are actually using a linear layout there is vertical. 83 00:04:33,090 --> 00:04:37,790 It's going to actually put these of five components here vertically. 84 00:04:37,890 --> 00:04:42,610 And if you actually assume that the height of this screen is 100. 85 00:04:42,870 --> 00:04:44,740 And let's actually do that. 86 00:04:44,850 --> 00:04:49,710 For example we are now assuming that the height of this screen is 100. 87 00:04:49,710 --> 00:04:50,430 OK. 88 00:04:50,850 --> 00:04:57,810 And if you want to actually put five components inside the screen we need to actually divide this 100 89 00:04:57,810 --> 00:04:59,350 by number five. 90 00:04:59,430 --> 00:04:59,840 OK. 91 00:04:59,910 --> 00:05:01,850 Because we've got five components here. 92 00:05:01,860 --> 00:05:02,650 OK. 93 00:05:02,700 --> 00:05:04,680 And the value is number 20. 94 00:05:04,680 --> 00:05:09,170 So let's actually put the number twenty four The vate of these components here. 95 00:05:09,180 --> 00:05:09,960 OK. 96 00:05:10,080 --> 00:05:18,210 So as you can see here I put the number twenty for the vate attributes of these card takes three components 97 00:05:18,390 --> 00:05:20,330 as you can see here in this screen. 98 00:05:20,400 --> 00:05:21,070 OK. 99 00:05:21,390 --> 00:05:24,170 And let's actually go on our project and see what happens. 100 00:05:24,300 --> 00:05:27,450 So as you can see here now it's going to actually run our project. 101 00:05:27,490 --> 00:05:34,080 And now you will see that it doesn't make any difference now because as you can see here I assumed that 102 00:05:34,080 --> 00:05:37,000 the height of our screen is is 100. 103 00:05:37,080 --> 00:05:37,770 OK. 104 00:05:38,010 --> 00:05:41,520 And I actually divided that 100 by number five. 105 00:05:41,700 --> 00:05:44,520 And the result was 20 and I actually put. 106 00:05:44,580 --> 00:05:50,910 And I actually assigned number 20 to the lay out rate of these takes the objects here of these takes 107 00:05:50,960 --> 00:05:51,780 you. 108 00:05:51,810 --> 00:05:52,580 OK. 109 00:05:52,920 --> 00:05:57,960 And now as you can see it doesn't make any difference if you assume the height of the screen actually 110 00:05:57,960 --> 00:06:00,840 assume the value of the height of the screen number one. 111 00:06:00,840 --> 00:06:04,400 Or if you assume the value of the height of the screen is 100. 112 00:06:04,410 --> 00:06:04,920 OK. 113 00:06:05,010 --> 00:06:06,890 It doesn't make any difference. 114 00:06:06,990 --> 00:06:07,960 OK. 115 00:06:08,520 --> 00:06:12,840 And as you can see it pood These are five components here. 116 00:06:13,060 --> 00:06:14,460 Inside this screen here. 117 00:06:14,460 --> 00:06:14,970 OK. 118 00:06:15,150 --> 00:06:20,790 And I actually reduced the number of markings and the number of padding of these components a little 119 00:06:20,790 --> 00:06:21,410 bit. 120 00:06:21,420 --> 00:06:22,000 OK. 121 00:06:22,050 --> 00:06:26,880 So as you can see here now all of these attributes are inside the screen here. 122 00:06:27,120 --> 00:06:27,650 OK. 123 00:06:27,660 --> 00:06:29,380 So hopefully that makes sense. 124 00:06:29,400 --> 00:06:30,750 So it lay out. 125 00:06:30,760 --> 00:06:36,030 Wait we can actually specify a size ratio between multiple views. 126 00:06:36,030 --> 00:06:36,600 OK. 127 00:06:36,720 --> 00:06:39,900 So as you can see here we've got multiple takes to use here. 128 00:06:39,930 --> 00:06:40,460 OK. 129 00:06:40,560 --> 00:06:47,960 And I want Actually every each of these takes two views to actually take one fifth of the layout height. 130 00:06:48,080 --> 00:06:48,570 OK. 131 00:06:48,660 --> 00:06:53,720 So first I actually assumed that the layout height of this screen is one hundred. 132 00:06:53,910 --> 00:06:58,310 And then I divided that 100 by number five. 133 00:06:58,420 --> 00:07:00,220 OK OK because I have five. 134 00:07:00,340 --> 00:07:01,620 I'll text you here. 135 00:07:01,620 --> 00:07:02,410 OK. 136 00:07:02,430 --> 00:07:08,200 And the result was number 20 and then I assigned numbers 20 to this lay out eight. 137 00:07:08,220 --> 00:07:08,710 OK. 138 00:07:08,880 --> 00:07:13,690 So I gave a lay out weight of 20 to each of these picks to use here. 139 00:07:13,740 --> 00:07:14,460 OK. 140 00:07:14,460 --> 00:07:19,760 Each of these takes here actually to take von fefe of the layout height. 141 00:07:19,830 --> 00:07:20,560 OK. 142 00:07:20,880 --> 00:07:25,670 So that's why we can't actually see all of these values here. 143 00:07:25,710 --> 00:07:30,710 OK because each of these takes views actually take one fifth of the screen. 144 00:07:30,840 --> 00:07:31,690 OK. 145 00:07:32,130 --> 00:07:34,170 So hopefully that makes sense. 146 00:07:34,260 --> 00:07:39,370 And now I want to actually talk about casting objects in Java. 147 00:07:39,420 --> 00:07:44,580 OK so now that you actually know all about inheritance in Java are you going to actually talk about 148 00:07:44,700 --> 00:07:46,620 caste themed objects. 149 00:07:46,620 --> 00:07:47,040 OK. 150 00:07:47,070 --> 00:07:52,540 So as you can see here we've got these five text view objects here. 151 00:07:52,560 --> 00:07:53,340 OK. 152 00:07:53,730 --> 00:08:00,930 And let's actually hold the comment key and then click on the text you hear if you are using a Windows 153 00:08:00,930 --> 00:08:06,380 machine you need to actually hold the control key on your keyboard and then click on takes to you. 154 00:08:06,390 --> 00:08:06,920 OK. 155 00:08:07,110 --> 00:08:10,000 So as you can see here this is our text view class here. 156 00:08:10,050 --> 00:08:10,530 OK. 157 00:08:10,590 --> 00:08:17,530 And this text your class is actually inheriting all of the features and behaviors that are inside this 158 00:08:17,780 --> 00:08:18,350 view class. 159 00:08:18,360 --> 00:08:19,020 OK. 160 00:08:19,020 --> 00:08:23,250 So we can actually say that this takes the class ease of view. 161 00:08:23,550 --> 00:08:24,370 OK. 162 00:08:24,780 --> 00:08:31,170 And here inside is main activity that Java right here as you can see because you are actually referring 163 00:08:31,440 --> 00:08:35,010 to a component inside the screen as you can see. 164 00:08:35,310 --> 00:08:36,830 We've got these components here. 165 00:08:36,840 --> 00:08:37,500 OK. 166 00:08:37,830 --> 00:08:44,010 Because we are actually referring to those components we need to specify that we are actually referring 167 00:08:44,340 --> 00:08:46,600 to our text view component. 168 00:08:46,620 --> 00:08:47,440 OK. 169 00:08:47,670 --> 00:08:52,750 So here we are truly casting that object to a text art object. 170 00:08:52,770 --> 00:08:58,820 Otherwise the compiler may finish that we are actually referring to our view object. 171 00:08:58,970 --> 00:08:59,490 OK. 172 00:08:59,580 --> 00:09:01,720 But this is our text view. 173 00:09:01,830 --> 00:09:02,470 OK. 174 00:09:02,790 --> 00:09:07,980 So that's why if you actually cast at this object to our text you object. 175 00:09:07,980 --> 00:09:08,440 OK. 176 00:09:08,520 --> 00:09:09,780 So this is very important. 177 00:09:09,840 --> 00:09:15,780 As you can see here inside this text your class this text is inheriting all of the features and behaviors 178 00:09:16,110 --> 00:09:17,520 of this class. 179 00:09:17,840 --> 00:09:22,150 And this means that this takes through ease of view. 180 00:09:22,430 --> 00:09:23,010 OK. 181 00:09:23,130 --> 00:09:30,240 So Vieni to actually cast this object to a text view in order to let the compiler know that we are actually 182 00:09:30,240 --> 00:09:32,390 referring to our text view object. 183 00:09:32,400 --> 00:09:32,840 OK. 184 00:09:32,940 --> 00:09:37,500 But I think that's enough for now about our casting objects. 185 00:09:37,500 --> 00:09:37,990 OK. 186 00:09:38,070 --> 00:09:42,630 Later in this course more familiar with casting objects in Java. 187 00:09:42,810 --> 00:09:44,400 But for now it's enough. 188 00:09:44,920 --> 00:09:47,890 And our Forth Android application is finished. 189 00:09:48,060 --> 00:09:48,800 OK. 190 00:09:49,200 --> 00:09:53,370 And we have successfully built our Forth Android application. 191 00:09:53,490 --> 00:09:59,370 And if you have any questions about inheritance in Java please post the discussion in the course and 192 00:09:59,370 --> 00:10:02,290 then I'll do my best to answer your questions. 193 00:10:02,730 --> 00:10:07,990 And thank you very much for watching and I'll see you in the next tutorial.