1 00:00:00,390 --> 00:00:02,640 And this is our main activity class. 2 00:00:02,940 --> 00:00:09,810 So as you can see here this main activity class actually extends from this app combat activity here 3 00:00:10,220 --> 00:00:12,270 at combat activities or class. 4 00:00:12,300 --> 00:00:13,050 OK. 5 00:00:13,380 --> 00:00:21,060 And this main activity class actually inherits all of the features and behaviors of this app combat 6 00:00:21,060 --> 00:00:21,600 activity. 7 00:00:21,600 --> 00:00:22,210 OK. 8 00:00:22,410 --> 00:00:27,390 And we can use those features and behaviors in our application. 9 00:00:27,780 --> 00:00:34,590 So you may wonder how we can actually find the behaviors or features or instance variables of other 10 00:00:34,590 --> 00:00:38,150 classes that are actually predefined for us. 11 00:00:38,460 --> 00:00:42,330 And the answer is to actually use the Java documentation's. 12 00:00:42,360 --> 00:00:45,220 So how we can actually find the Java documentation. 13 00:00:45,540 --> 00:00:52,500 So in order to find out about the Java documentation's or about the Android documentation's you need 14 00:00:52,500 --> 00:01:02,220 to open the Open your web browser and here just type in hushed TTP as Colon slash slash docs dot Oracle 15 00:01:02,520 --> 00:01:11,990 dot com slash Java asthe slash 8 slash docs slash API and then press enter on your keyboard. 16 00:01:12,180 --> 00:01:19,260 So as you can see here now as you can see these are all the packages that are actually predefined for 17 00:01:19,260 --> 00:01:24,960 us in order to help us create our own Android applications rapidly. 18 00:01:25,110 --> 00:01:31,140 And as you can see here these are all the packages that are available for us and these are all the classes 19 00:01:31,560 --> 00:01:37,860 that are available for us and we can use them and I highly recommend that you actually read all of these 20 00:01:37,860 --> 00:01:40,230 descriptions about these packages. 21 00:01:40,230 --> 00:01:43,380 For example this is the job of that applet package. 22 00:01:43,380 --> 00:01:43,680 OK. 23 00:01:43,680 --> 00:01:46,420 And this is the description for this package. 24 00:01:46,470 --> 00:01:54,480 So as you can see this package provides the classes necessary to create an applet and take classes and 25 00:01:54,480 --> 00:01:58,180 applet uses to communicate with its applet context. 26 00:01:58,200 --> 00:01:58,770 OK. 27 00:01:58,980 --> 00:02:05,100 Or if you want to actually vote with the network you can actually find the job of that net package as 28 00:02:05,100 --> 00:02:06,280 you can see here. 29 00:02:06,390 --> 00:02:08,140 This is the jobs that net package. 30 00:02:08,190 --> 00:02:12,940 So this package provides the classes for implement any networking applications. 31 00:02:12,960 --> 00:02:13,640 OK. 32 00:02:13,860 --> 00:02:19,020 So if you want to actually create an application that is related to the network we can actually use 33 00:02:19,020 --> 00:02:25,230 the methods and classes inside this package or as against it this is the Java that total package this 34 00:02:25,230 --> 00:02:31,860 package contains the collections Flamebird legacy collection collects classes events model dates and 35 00:02:31,860 --> 00:02:38,540 time facilities international law zation and other classes and lots of other packages. 36 00:02:38,580 --> 00:02:45,240 OK so this documentation is going to be your best friend when you want to actually create Java or Android 37 00:02:45,270 --> 00:02:51,510 applications or if you want to actually find out about documentation's about about the Android inside 38 00:02:51,510 --> 00:02:53,420 your web browser just typing here. 39 00:02:53,460 --> 00:02:57,690 Developers that Android dot com slash guide slash index that is Steimle. 40 00:02:57,690 --> 00:02:58,220 OK. 41 00:02:58,320 --> 00:03:03,270 So as you can see here for example if you want to actually create an application that uses the media 42 00:03:03,270 --> 00:03:10,090 and camera if I just click on this arrow here and here for example if I click on this media playback 43 00:03:10,090 --> 00:03:18,210 back here as you can see it's going to actually show me some are descriptions and codes that are required 44 00:03:18,510 --> 00:03:22,670 for actually creating applications that is related to media playback. 45 00:03:22,680 --> 00:03:23,670 OK. 46 00:03:24,120 --> 00:03:25,780 So hopefully that makes sense. 47 00:03:25,800 --> 00:03:33,710 So you don't actually have to know about all of these descriptions or methods now but are at the end 48 00:03:33,710 --> 00:03:36,320 of this course you will be more familiar with these concepts. 49 00:03:36,330 --> 00:03:36,790 OK. 50 00:03:36,810 --> 00:03:39,020 So let's go back inside the Android studio. 51 00:03:39,150 --> 00:03:39,870 OK. 52 00:03:39,870 --> 00:03:47,370 As I said earlier in this tutorial this main activity class actually inherits from this app Compaq's 53 00:03:47,460 --> 00:03:48,420 activity here. 54 00:03:48,450 --> 00:03:49,020 OK. 55 00:03:49,080 --> 00:03:56,400 If I hold the command key on my keyboard and press that app combat activity here as I can see this is 56 00:03:56,400 --> 00:03:58,200 the average computer activity. 57 00:03:58,380 --> 00:04:05,070 But if you are using a Windows machine you need to actually hold the control key on your keyboard and 58 00:04:05,070 --> 00:04:07,200 then click on Add combat activity here. 59 00:04:07,200 --> 00:04:12,720 OK so as you can see here these are the Misfit's that is inside after combat activity. 60 00:04:12,720 --> 00:04:13,130 OK. 61 00:04:13,200 --> 00:04:19,650 So as you can see here this Apple computer activity actually inherits from this fragment activity here. 62 00:04:19,680 --> 00:04:20,300 OK. 63 00:04:20,430 --> 00:04:28,920 I'll talk more about implements later but for now just know that these are combat activity inherits 64 00:04:29,250 --> 00:04:34,260 from this fragment activity inside this app Campana activity. 65 00:04:34,270 --> 00:04:40,390 We've got these methods and create Meffert on post create Manford and other methods. 66 00:04:40,680 --> 00:04:46,930 And inside these main activity it as you can see we are using these Smurfit uncreate Smurfit. 67 00:04:47,190 --> 00:04:55,980 So because we are actually inheriting all of the behaviors that is inside this app compared to activity 68 00:04:56,430 --> 00:04:59,860 we can actually use the Smurfette here. 69 00:05:00,040 --> 00:05:00,490 OK. 70 00:05:00,550 --> 00:05:03,690 And inside display if we can put our own implementation. 71 00:05:03,700 --> 00:05:04,630 OK. 72 00:05:05,020 --> 00:05:07,980 So let's go back inside the Apple computer activity. 73 00:05:08,140 --> 00:05:15,460 And here if I hold the command key on my keyboard and click on fragment activity here. 74 00:05:15,580 --> 00:05:22,500 Now as you can see these are the behaviors that is inside these this fragment activity here. 75 00:05:22,510 --> 00:05:23,140 OK. 76 00:05:23,440 --> 00:05:31,080 And again this fragment activity actually extends or inherits from the base fragment activity honeycomb. 77 00:05:31,090 --> 00:05:31,980 OK. 78 00:05:32,590 --> 00:05:35,130 So hopefully that makes sense. 79 00:05:35,350 --> 00:05:43,950 Let's actually close this tab here and again close this up fragment activity that java file here. 80 00:05:44,140 --> 00:05:46,450 So now I want to actually create some examples. 81 00:05:46,680 --> 00:05:47,250 OK. 82 00:05:47,410 --> 00:05:51,280 Now let's go inside the content underline made that example. 83 00:05:51,400 --> 00:05:56,230 And here just dragging up linearly out into the screen here. 84 00:05:56,240 --> 00:05:58,410 OK linearly out vertical. 85 00:05:58,720 --> 00:05:59,670 Okay. 86 00:06:00,280 --> 00:06:07,630 And just put it here and just click on these relatively out here and just find the padding attribute 87 00:06:07,630 --> 00:06:14,160 here and just open this padding attributes by just clicking on this little triangle here. 88 00:06:14,410 --> 00:06:17,800 And for the oh I'll just type in zero. 89 00:06:18,250 --> 00:06:19,470 OK. 90 00:06:20,200 --> 00:06:29,770 Now as you can see here are the feet and the height of these are linear layout is actually much padded. 91 00:06:29,800 --> 00:06:30,270 OK. 92 00:06:30,310 --> 00:06:34,420 So as you can see here are the width and height of this linear layout. 93 00:06:34,440 --> 00:06:36,050 It covers the entire screen. 94 00:06:36,130 --> 00:06:40,630 So if you just click on these linear layouts where Stichel here and here you can actually see that the 95 00:06:40,630 --> 00:06:47,740 attributes related to this linear layout lay out which as you can see it is match parent and lay out 96 00:06:47,740 --> 00:06:48,130 height. 97 00:06:48,130 --> 00:06:49,390 It is much padding. 98 00:06:49,440 --> 00:06:56,260 OK so large this will and just are dragging here and here just double click and this takes you here 99 00:06:56,680 --> 00:06:59,130 for the text just typed in animal. 100 00:07:00,250 --> 00:07:03,110 And for the idea the anemone. 101 00:07:03,130 --> 00:07:03,720 OK. 102 00:07:06,300 --> 00:07:14,610 And again dragging another takes you into this linearly out and double click on this text you for the 103 00:07:14,610 --> 00:07:23,250 text us type in here chats and for the ID TXI the chat OK. 104 00:07:24,030 --> 00:07:32,440 And again like in another text you hear just just double click on this text you hear for the text just 105 00:07:32,440 --> 00:07:40,110 type in here line and for the ID the lion OK. 106 00:07:41,670 --> 00:07:48,940 And again just like in another text you hear double click on it for the text just type in here. 107 00:07:48,980 --> 00:07:51,400 Leppert OK. 108 00:07:51,750 --> 00:07:55,250 And the idea here is the Lepard. 109 00:07:55,260 --> 00:07:56,440 OK. 110 00:07:57,480 --> 00:08:05,210 And again and drag and other text you hear just double click on this text view. 111 00:08:05,640 --> 00:08:12,490 And for the text just typing here word and for the idea to use the word ok. 112 00:08:13,050 --> 00:08:16,460 Select all of these text use here and then. 113 00:08:16,470 --> 00:08:19,720 So you might actually give padding to these text views. 114 00:08:19,830 --> 00:08:27,390 So I need to actually find the padding attributes here and here for the I'll just type in here 10 and 115 00:08:27,390 --> 00:08:31,270 I want to give Omar Amergin to these text use. 116 00:08:31,350 --> 00:08:37,910 So I just need to find in the lay out margin here and 40 or just type in here 10. 117 00:08:38,380 --> 00:08:39,470 OK. 118 00:08:40,110 --> 00:08:49,530 So now as you can see I've got five takes to use here and I gave a takes and an idea to each of these 119 00:08:49,530 --> 00:08:50,370 takes us here. 120 00:08:50,370 --> 00:08:50,750 OK. 121 00:08:50,790 --> 00:08:57,640 So that I can actually interact with these objects which are on this screen Vilda overcoats. 122 00:08:57,660 --> 00:08:58,080 OK. 123 00:08:58,080 --> 00:09:01,430 So let's actually go back and say the main activity here. 124 00:09:01,860 --> 00:09:04,970 And as you can see here this is our main activity. 125 00:09:04,980 --> 00:09:05,770 OK. 126 00:09:05,970 --> 00:09:11,330 Now I want to actually create five different classes with these names. 127 00:09:11,340 --> 00:09:11,850 OK. 128 00:09:12,000 --> 00:09:19,130 A class called animal or class called chat's a class called lion and a class called the leopard. 129 00:09:19,140 --> 00:09:20,990 And finally a class called Bird. 130 00:09:21,030 --> 00:09:21,600 OK. 131 00:09:21,690 --> 00:09:23,040 So let's see how we can do that. 132 00:09:23,040 --> 00:09:28,560 So in order to create a class you need to actually click on doubleclick on this Java folder here and 133 00:09:28,560 --> 00:09:30,300 then double click on this folder here. 134 00:09:30,420 --> 00:09:34,080 And then in it you actually click on File new Java class. 135 00:09:34,080 --> 00:09:35,450 OK. 136 00:09:35,820 --> 00:09:41,740 So for the class name just type in here element and then click on OK. 137 00:09:42,210 --> 00:09:47,850 So as you can see here this is our Animal class and this class is inside this package here. 138 00:09:47,850 --> 00:09:48,500 OK.