1 00:00:00,270 --> 00:00:05,990 Hire everyone in this theater you're going to go ahead and create another Android application. 2 00:00:06,000 --> 00:00:06,990 So just click on this. 3 00:00:07,020 --> 00:00:15,480 Start a new Android studio project here and then for the application name just type in here app 27 and 4 00:00:15,480 --> 00:00:24,150 then click on next year's choose AP A16 Android 4.1 Jelly Bean for minimum STK click on next and here 5 00:00:24,180 --> 00:00:28,630 choose blank activity next and then actually can finish. 6 00:00:28,650 --> 00:00:29,280 OK. 7 00:00:29,550 --> 00:00:30,080 OK. 8 00:00:30,150 --> 00:00:35,550 First of all let's actually select these hello or takes you here and then press on it delete key on 9 00:00:35,550 --> 00:00:39,110 your keyboard and then double click on this arrest folder here. 10 00:00:39,360 --> 00:00:43,080 Lay out activity underline make that example OK. 11 00:00:43,320 --> 00:00:48,650 And here choose fluting action button here and then press on delete key on your keyboard. 12 00:00:48,660 --> 00:00:49,260 OK. 13 00:00:49,650 --> 00:00:55,290 So now let's actually go back inside this content underline minute made that example and then double 14 00:00:55,290 --> 00:00:58,930 click on this tab here in order to make this area wider. 15 00:00:59,010 --> 00:01:04,700 So now it is actually track linearly out vertical into these relatively out here. 16 00:01:04,710 --> 00:01:04,950 OK. 17 00:01:04,950 --> 00:01:06,600 And put it at the center OK. 18 00:01:07,080 --> 00:01:12,910 And then let's actually drag a scroll view of vertical scroll view into these linearly alphabetical 19 00:01:12,930 --> 00:01:13,510 here. 20 00:01:13,530 --> 00:01:19,620 So as you can see this is a vertical scroll view here and put it here at the center of this linear left 21 00:01:19,620 --> 00:01:20,750 vertical OK. 22 00:01:21,210 --> 00:01:27,880 And now this section is right and are there linearly out vertical into this scroll view here OK. 23 00:01:27,930 --> 00:01:31,750 So as you know scroll you can only accept one direct child. 24 00:01:32,010 --> 00:01:37,890 So if you just put in one scroll you hear and then you actually put a linearly aesthetical into this 25 00:01:37,890 --> 00:01:38,720 scroll view. 26 00:01:38,910 --> 00:01:44,620 And then when you can actually put all our components into this linearly aesthetical here. 27 00:01:44,650 --> 00:01:52,590 OK so now let's actually track a large text view into this linearly and we're still here. 28 00:01:52,680 --> 00:01:53,240 OK. 29 00:01:53,490 --> 00:01:57,900 And double click on it for the text just type in here animal. 30 00:01:58,170 --> 00:01:58,760 OK. 31 00:01:58,980 --> 00:02:02,270 And then a person Enter key on your keyboard. 32 00:02:02,580 --> 00:02:10,320 Now let's actually select this larger text view here and put it inside these linearly alphabetical here. 33 00:02:10,380 --> 00:02:17,390 Double click on it and delete the text of this text view for the ID just step in here TXI the animal. 34 00:02:17,460 --> 00:02:18,220 OK. 35 00:02:18,690 --> 00:02:21,150 And then press on Enter key on your keyboard. 36 00:02:21,480 --> 00:02:27,040 Now let's actually drag another large text view into this linearly afterwards to call here. 37 00:02:27,300 --> 00:02:27,830 OK. 38 00:02:27,960 --> 00:02:34,910 Double click on it and for the text just type in here lion and then press Enter key on your keyboard 39 00:02:35,370 --> 00:02:41,670 and then let's actually drag and another large takes you into this linearly out of vertical here and 40 00:02:41,670 --> 00:02:48,540 double click on it deletes the text of this text view for the ID just typing here takes the lion. 41 00:02:48,630 --> 00:02:49,150 OK. 42 00:02:49,200 --> 00:02:54,660 And then press Enter key on your keyboard so that it's actually and other large takes you into this 43 00:02:54,750 --> 00:02:56,590 linearly elsewhere sequel here. 44 00:02:56,640 --> 00:03:01,150 Double click on it and for the text just type in here. 45 00:03:01,390 --> 00:03:06,980 Line using polymorphism. 46 00:03:07,170 --> 00:03:07,670 OK. 47 00:03:07,770 --> 00:03:11,320 And then Persaud Enter key on your keyboard. 48 00:03:11,460 --> 00:03:12,190 OK. 49 00:03:12,350 --> 00:03:18,740 And now let's actually track another large takes you into these linearly alphabetical double click on 50 00:03:18,750 --> 00:03:20,040 it. 51 00:03:20,220 --> 00:03:21,680 Is the text of the stakes for. 52 00:03:21,720 --> 00:03:25,130 And for the idea just typing here takes the polymorphism 53 00:03:28,530 --> 00:03:32,230 OK and then a person enter the key on your keyboard. 54 00:03:32,250 --> 00:03:32,960 OK. 55 00:03:34,210 --> 00:03:38,930 So now the design of art actually to use an interface is actually finished. 56 00:03:38,950 --> 00:03:44,350 So now let's actually go back and say this main activity that you have a file here and then delete these 57 00:03:45,520 --> 00:03:50,180 deleted is lines of code that are actually related to the Options menu here. 58 00:03:50,350 --> 00:03:51,240 OK. 59 00:03:51,700 --> 00:03:56,940 And then delete this block of code that is actually related to the floating action button. 60 00:03:57,100 --> 00:04:01,060 Ok so now we don't actually put our own code here. 61 00:04:01,060 --> 00:04:08,070 OK but first of all we need to actually create some classes some Java classes here inside that project. 62 00:04:08,430 --> 00:04:12,680 OK so now let's actually create a class called animal. 63 00:04:12,850 --> 00:04:14,050 So just click on file. 64 00:04:14,170 --> 00:04:15,420 Ok new. 65 00:04:15,760 --> 00:04:18,280 And then click on Java class here. 66 00:04:18,310 --> 00:04:18,930 OK. 67 00:04:19,180 --> 00:04:25,190 And for the name just type in here any month and then click on OK here. 68 00:04:25,900 --> 00:04:32,350 Let's actually create another class for the new Jobar class for the name of the class just typing and 69 00:04:32,380 --> 00:04:33,190 chat. 70 00:04:33,590 --> 00:04:34,310 OK. 71 00:04:34,360 --> 00:04:35,390 OK. 72 00:04:35,980 --> 00:04:42,970 And it's actually create another class file new Java class here for the class name just type in here 73 00:04:43,040 --> 00:04:45,080 lion and then click on. 74 00:04:45,100 --> 00:04:45,750 OK. 75 00:04:46,150 --> 00:04:52,510 So as you can see here we created our classes here and now this actually to go back and say this animal 76 00:04:52,600 --> 00:04:57,990 that will find here and say that this animal class we can actually put in some lines of code here. 77 00:04:58,060 --> 00:04:58,470 OK. 78 00:04:58,540 --> 00:05:01,560 Let's actually declare some instance variables. 79 00:05:01,570 --> 00:05:02,230 OK. 80 00:05:02,620 --> 00:05:07,780 So as you can see here this is these are actually Lemar my instance variables that they actually declare 81 00:05:07,810 --> 00:05:08,430 here. 82 00:05:08,680 --> 00:05:13,060 So here I created I actually declared this instance variable. 83 00:05:13,090 --> 00:05:14,970 The access modifier is private. 84 00:05:15,010 --> 00:05:18,180 Actually the type of this instance valuable is strange. 85 00:05:18,370 --> 00:05:21,690 And the name of this instance variable is animal name. 86 00:05:21,730 --> 00:05:22,250 OK. 87 00:05:22,510 --> 00:05:30,410 And here if you actually declared another instance variable private string animal culture private and 88 00:05:31,030 --> 00:05:34,890 animal power and private it animals speak. 89 00:05:34,900 --> 00:05:35,170 OK. 90 00:05:35,170 --> 00:05:40,090 So not notice that I didn't actually instantiate this instance variables here. 91 00:05:40,210 --> 00:05:43,650 So I'll just declare this in these instance variables OK. 92 00:05:43,660 --> 00:05:48,770 Now let's actually create a constructor for this animal class here. 93 00:05:48,790 --> 00:05:50,180 OK so I just can't. 94 00:05:50,410 --> 00:05:54,820 I'm just going to pasting this constructor here and then I'm going to explain to you what's going on 95 00:05:54,820 --> 00:05:55,150 here. 96 00:05:55,150 --> 00:05:55,540 OK. 97 00:05:55,630 --> 00:05:58,170 So as you can see here this is my constructor. 98 00:05:58,260 --> 00:05:59,670 They actually paste that here. 99 00:05:59,770 --> 00:06:00,370 OK. 100 00:06:00,550 --> 00:06:03,700 The access modifier of this constructor is public. 101 00:06:03,700 --> 00:06:11,560 The name of this constructor must be as this in name of these actually the class must be the same as 102 00:06:11,560 --> 00:06:12,960 the name of this class name. 103 00:06:13,020 --> 00:06:17,940 Ok here I actually specify that this constructor is going to accept some arguments. 104 00:06:17,960 --> 00:06:21,740 Ok the first argument as you can see is actually of type strain. 105 00:06:21,970 --> 00:06:24,300 And the name of this argument is the money. 106 00:06:24,340 --> 00:06:25,020 OK. 107 00:06:25,450 --> 00:06:29,120 And here as you can see our second argument is actually of type. 108 00:06:29,110 --> 00:06:33,390 Strange animal culture in power in speed. 109 00:06:33,460 --> 00:06:34,110 OK. 110 00:06:34,360 --> 00:06:40,170 And here inside of these constructed here you can see that they actually created two statements here. 111 00:06:40,180 --> 00:06:40,680 OK. 112 00:06:40,690 --> 00:06:47,290 The first IF statement as you can see it says I should if the value of the power argument as you can 113 00:06:47,290 --> 00:06:55,400 see I am referring to the name of this argument here OK if power is less than or equal to number 0. 114 00:06:55,660 --> 00:06:58,060 OK then it's going I should be for an exception. 115 00:06:58,180 --> 00:07:01,200 OK fro new illegal argument. 116 00:07:01,210 --> 00:07:04,240 Exceptional case can actually prove an exception object. 117 00:07:04,280 --> 00:07:12,190 OK here as you can see this new keyboard is going to create an exception object for a new legal argument 118 00:07:12,270 --> 00:07:13,640 x exception. 119 00:07:13,660 --> 00:07:20,800 So if you actually pass a value that is less than number zero to this constructor for this exception 120 00:07:21,190 --> 00:07:24,040 and then it's going to show the text inside of the lock. 121 00:07:24,160 --> 00:07:26,360 And we can see what's what's the error. 122 00:07:26,410 --> 00:07:27,270 OK. 123 00:07:27,640 --> 00:07:29,490 Actually that the application is going to crash. 124 00:07:29,680 --> 00:07:32,040 If we actually put this line of code here. 125 00:07:32,140 --> 00:07:37,800 OK but I just wanted to show you how you can use actual exceptions in your projects. 126 00:07:37,810 --> 00:07:45,870 And here it says again if the value of this speed variable is less than or equal to number 0 again fro 127 00:07:46,120 --> 00:07:52,380 new illegal argument exception the value of speed must be greater than number 0. 128 00:07:52,510 --> 00:07:53,190 OK. 129 00:07:53,470 --> 00:07:59,890 And then here I am actually instantiating these instance variables that I actually created inside this 130 00:07:59,940 --> 00:08:00,960 animal class. 131 00:08:01,100 --> 00:08:03,300 Does that animal name. 132 00:08:03,310 --> 00:08:06,870 Here I am referring to this animal named instance valuable. 133 00:08:06,870 --> 00:08:10,500 Does that animal name assignment operator animal. 134 00:08:10,630 --> 00:08:14,130 Ok I am referring to this animal name argument here. 135 00:08:14,140 --> 00:08:19,950 As you can see and here I am actually referring to the name of this animal color instance variable. 136 00:08:20,020 --> 00:08:24,790 Does that animal color assignment operator animal color. 137 00:08:24,820 --> 00:08:27,940 Here you can see I am referring to the name of this argument. 138 00:08:28,060 --> 00:08:31,510 Does that animal power instance valuable here. 139 00:08:31,760 --> 00:08:35,000 Assignment operator power argument. 140 00:08:35,010 --> 00:08:35,820 OK. 141 00:08:36,120 --> 00:08:44,070 And here I am actually typing I actually referred to the name of this instance variable does that animal 142 00:08:44,070 --> 00:08:46,830 speed assignment operator speed. 143 00:08:46,980 --> 00:08:50,330 OK so hopefully that makes sense. 144 00:08:50,370 --> 00:08:54,570 Now there's actually some more lines of code here inside of this class. 145 00:08:54,570 --> 00:09:01,070 So now let's actually create some getters and setters for these instance variables. 146 00:09:01,350 --> 00:09:06,880 So here instead of this animal class as you can see here I can just right right click here. 147 00:09:06,900 --> 00:09:07,440 OK. 148 00:09:07,680 --> 00:09:12,060 And then click on generate as you can see here this is generate here. 149 00:09:12,180 --> 00:09:16,420 You can actually hold the command key and then present an OK. 150 00:09:16,980 --> 00:09:22,500 And then here as you can see here and actually create get here set here or I can actually create getters 151 00:09:22,530 --> 00:09:23,520 and setters. 152 00:09:23,550 --> 00:09:30,150 So I just just click on this get here and sit here and then hit as you can see these are our own instance 153 00:09:30,150 --> 00:09:33,120 variables that we created inside of this class. 154 00:09:33,120 --> 00:09:37,220 So just select all of these instance variables here. 155 00:09:37,290 --> 00:09:37,860 OK. 156 00:09:37,920 --> 00:09:39,510 And then click on OK. 157 00:09:39,720 --> 00:09:46,160 So now as you can see the ID actually created these getters and setters automatically for us. 158 00:09:46,170 --> 00:09:53,280 OK you can see this good animal name said animal name good animal Codder are set animal color gets animal 159 00:09:53,280 --> 00:09:58,500 power to sit animal power with animals speed and animal speed here. 160 00:09:58,600 --> 00:09:58,900 OK.