1 00:00:00,150 --> 00:00:05,770 Hi everyone in this theater we're going to go ahead and create another Android application. 2 00:00:05,790 --> 00:00:06,690 So just click on this. 3 00:00:06,720 --> 00:00:13,170 Start in your Android studio project and then for the application name just type in here app furtively 4 00:00:13,890 --> 00:00:23,130 and then click on next year choose AP A16 Android 4.1 Jelly Bean next and Blancher activity next and 5 00:00:23,130 --> 00:00:24,450 then click on finish. 6 00:00:24,450 --> 00:00:30,310 Now let's actually delete this hello takes you here and then our present delete key on your keyboard. 7 00:00:30,390 --> 00:00:33,860 Now let's actually double click on the rest folder here. 8 00:00:33,870 --> 00:00:37,890 Lay out and then activity underline made that example. 9 00:00:38,190 --> 00:00:43,110 And then here selectees filleting action button and then press on the right here on your keyboard. 10 00:00:43,110 --> 00:00:43,640 OK. 11 00:00:43,950 --> 00:00:48,120 So now let's actually go back inside this content underline that example. 12 00:00:48,330 --> 00:00:50,780 And now let's actually click on this. 13 00:00:50,780 --> 00:00:52,060 It takes tap here. 14 00:00:52,200 --> 00:00:52,860 OK. 15 00:00:53,190 --> 00:00:54,660 And here is actually the change. 16 00:00:54,660 --> 00:00:58,130 These are relatively out here to takes to you. 17 00:00:58,320 --> 00:00:58,830 OK. 18 00:00:58,980 --> 00:01:04,150 And then here as you can see if you have text you here inside these texts. 19 00:01:04,170 --> 00:01:08,790 So in this tutorial we want to actually create a simple application. 20 00:01:08,790 --> 00:01:09,280 OK. 21 00:01:09,480 --> 00:01:15,330 So let's actually go to the Android documentation as you can see we have this audio adapter here. 22 00:01:15,420 --> 00:01:15,750 OK. 23 00:01:15,750 --> 00:01:22,290 And this area adapter or inherits all of the features and behaviors of this of this base after class 24 00:01:22,800 --> 00:01:28,340 and implements the filter table interface and this fiend spinner adapter. 25 00:01:28,380 --> 00:01:35,530 So as you can see here it says a concrete base adapter that is backed by an array of arbitrary objects. 26 00:01:35,550 --> 00:01:36,320 OK. 27 00:01:36,690 --> 00:01:43,770 By default this class expects that the provided resource ID references on a single text view. 28 00:01:43,830 --> 00:01:44,560 OK. 29 00:01:44,940 --> 00:01:47,790 However the text view is referenced. 30 00:01:48,000 --> 00:01:48,460 OK. 31 00:01:48,540 --> 00:01:52,740 It will be filled with the string of each object in the array. 32 00:01:52,900 --> 00:01:57,550 OK you can add the lists or arrays of custom objects. 33 00:01:57,570 --> 00:01:58,040 OK. 34 00:01:58,140 --> 00:02:02,700 So that's why we actually change this relatively And here are two text view. 35 00:02:02,760 --> 00:02:08,450 OK because we want to actually look at our array of objects into this text view here. 36 00:02:08,550 --> 00:02:09,320 OK. 37 00:02:09,660 --> 00:02:15,410 So as you can see here inside this design type instead instead of a relatively out we have a text view. 38 00:02:15,570 --> 00:02:16,310 OK. 39 00:02:16,790 --> 00:02:18,140 So. 40 00:02:18,350 --> 00:02:22,660 Now let's actually go back and say this main activity class here. 41 00:02:22,730 --> 00:02:23,500 OK. 42 00:02:23,600 --> 00:02:28,370 And then let's actually delete these lines of quote that are related to the Options menu. 43 00:02:28,580 --> 00:02:29,180 OK. 44 00:02:29,600 --> 00:02:33,820 And then delete this block of code that is related to the floating action button. 45 00:02:34,070 --> 00:02:36,550 And now we can actually put in our own code here. 46 00:02:36,560 --> 00:02:42,080 So now inside of this main activity class I'm going to put in Assignment some lines of code and then 47 00:02:42,080 --> 00:02:44,180 I'm going to actually explain to you what's going on here. 48 00:02:44,180 --> 00:02:48,080 So as you can see here we have an array of string values here. 49 00:02:48,080 --> 00:02:48,640 OK. 50 00:02:48,740 --> 00:02:52,670 So he had as he can see the name of our array is called names. 51 00:02:52,820 --> 00:02:56,590 And I actually assign these values to my Aure as you can see here. 52 00:02:56,660 --> 00:02:57,260 OK. 53 00:02:57,590 --> 00:03:03,750 So here I in line 12 I declared an object of type 3 adapter. 54 00:03:03,800 --> 00:03:04,280 OK. 55 00:03:04,460 --> 00:03:09,790 And as you can see here this object actually accepts a values of type string. 56 00:03:09,950 --> 00:03:10,630 OK. 57 00:03:11,120 --> 00:03:14,550 So now we want to actually create a list view. 58 00:03:14,570 --> 00:03:15,090 OK. 59 00:03:15,200 --> 00:03:21,910 So instead of extending from the African past activity this time we want to actually extend from these 60 00:03:21,960 --> 00:03:24,450 a list activity class. 61 00:03:24,710 --> 00:03:27,730 OK so what is this list activity class. 62 00:03:27,800 --> 00:03:31,030 Let's actually go back to the Android documentation. 63 00:03:31,100 --> 00:03:37,310 As you can see here we have this list activity class here and in your web browser you can't just type 64 00:03:37,310 --> 00:03:40,300 in RL and you will be guided to this page. 65 00:03:40,580 --> 00:03:46,820 So here as you can see the list actually with the class actually inherits all of the features and behaviors 66 00:03:47,150 --> 00:03:49,440 that are inside of this activity class. 67 00:03:49,490 --> 00:03:50,090 OK. 68 00:03:50,480 --> 00:04:00,500 So as you can see here now it says an activity that displays a list of items by binding to a data source 69 00:04:00,560 --> 00:04:01,830 such as an array. 70 00:04:01,880 --> 00:04:02,310 OK. 71 00:04:02,390 --> 00:04:05,650 So we have an array in our project as you can see here. 72 00:04:05,660 --> 00:04:06,660 This is the. 73 00:04:06,920 --> 00:04:07,450 OK. 74 00:04:07,670 --> 00:04:14,640 So to our data source such as an array or cursor and exposes our event handlers. 75 00:04:14,750 --> 00:04:21,110 When the user selects an item OK list activity hosts a list view object. 76 00:04:21,140 --> 00:04:24,310 OK that can be bound to different data sources. 77 00:04:24,380 --> 00:04:28,590 Typically either an array or the cursor hold the inquiry results. 78 00:04:28,600 --> 00:04:29,470 OK. 79 00:04:29,750 --> 00:04:32,950 So let's actually go back to the Android studio here. 80 00:04:33,020 --> 00:04:39,950 As you can see there's actually as you can see we cannot any more call this method as you can see here. 81 00:04:39,950 --> 00:04:45,860 So let's actually did it this method here and it's actually delete this object and we don't want to 82 00:04:45,860 --> 00:04:52,100 actually call this sets content view as you can see here are that lay out that activity made here anymore 83 00:04:52,370 --> 00:04:56,660 because this is what is actually showing the layout to the user. 84 00:04:56,660 --> 00:04:57,120 OK. 85 00:04:57,320 --> 00:05:03,310 So we don't want to call the Smurfette OK because if you have a text view inside this content underline 86 00:05:03,310 --> 00:05:04,380 main that example OK. 87 00:05:04,520 --> 00:05:09,070 So we don't want to actually call this our second interview here. 88 00:05:09,430 --> 00:05:09,920 OK. 89 00:05:09,950 --> 00:05:15,890 Now I want to actually instantiate this adapter object as you can see here that I actually declared 90 00:05:16,070 --> 00:05:17,100 in line 11. 91 00:05:17,120 --> 00:05:21,240 So I want to instantiate this object inside this uncreate method. 92 00:05:21,250 --> 00:05:22,230 As you can see here. 93 00:05:22,400 --> 00:05:23,000 OK. 94 00:05:23,150 --> 00:05:27,990 So I'm going to paste this line of code here and then I'm going to explain to you what's going on here. 95 00:05:28,010 --> 00:05:32,490 So as you can see here this is the line of code that actually pasted here after. 96 00:05:32,500 --> 00:05:35,800 So I actually referred to the name of this adapter object. 97 00:05:35,810 --> 00:05:36,080 OK. 98 00:05:36,110 --> 00:05:38,370 Assignment operator new. 99 00:05:38,510 --> 00:05:39,170 OK. 100 00:05:39,450 --> 00:05:40,590 Arey adapter. 101 00:05:40,730 --> 00:05:41,190 OK. 102 00:05:41,270 --> 00:05:44,810 As you can see inside these tanks I put in this string here. 103 00:05:44,810 --> 00:05:45,400 OK. 104 00:05:45,710 --> 00:05:51,800 And then inside the Prentice's I need to actually assign somebody else first of all I need to actually 105 00:05:51,800 --> 00:05:53,330 specify the context. 106 00:05:53,510 --> 00:05:54,000 OK. 107 00:05:54,110 --> 00:05:55,560 So the context is this class. 108 00:05:55,610 --> 00:05:57,320 Ok main activity that this. 109 00:05:57,650 --> 00:06:05,000 And then I need to actually specify the view that I want to actually put in my art objects too. 110 00:06:05,210 --> 00:06:05,700 OK. 111 00:06:05,720 --> 00:06:08,150 So as you can see here this is the view. 112 00:06:08,220 --> 00:06:15,080 OK I want to actually put these are our values to this view OK or else that content me k content underline 113 00:06:15,080 --> 00:06:15,540 meaning. 114 00:06:15,770 --> 00:06:17,380 And these are the values. 115 00:06:17,460 --> 00:06:22,360 Calls names as you can see here I actually referred to the name of this array. 116 00:06:22,430 --> 00:06:23,620 OK calls names. 117 00:06:23,660 --> 00:06:26,130 These are the values that I want to actually put in this view. 118 00:06:26,150 --> 00:06:31,970 I want to actually call a method that we actually inherit from this list activity class. 119 00:06:31,970 --> 00:06:38,270 So I can just type in here set list adapter as you can see here we have this Mfat So if we actually 120 00:06:38,270 --> 00:06:44,120 hold the command key and click on this method here for Windows users you can actually hold the control 121 00:06:44,120 --> 00:06:45,500 key and then click on dismiss it. 122 00:06:45,500 --> 00:06:46,260 OK. 123 00:06:46,580 --> 00:06:52,120 So as you can see here this is the Meffert that is inside of this list activity that Java class. 124 00:06:52,130 --> 00:06:52,680 OK. 125 00:06:52,790 --> 00:06:58,210 Set list that after and this if it actually exits an argument of type list adapter. 126 00:06:58,220 --> 00:06:59,590 OK adapter. 127 00:06:59,750 --> 00:07:02,600 So let's actually go back and say this main activity that Joe right here. 128 00:07:02,750 --> 00:07:09,170 And as you can see here we have this adapter object here as you can see here every adapter and we can 129 00:07:09,170 --> 00:07:11,590 actually put this adapter here. 130 00:07:11,720 --> 00:07:12,570 OK. 131 00:07:12,980 --> 00:07:18,040 So as you can see here now let's actually run our project and see what happens. 132 00:07:18,060 --> 00:07:18,510 OK. 133 00:07:18,620 --> 00:07:24,200 So as you can see here now our application is running on the simulator here and now we can see these 134 00:07:24,200 --> 00:07:25,420 values here. 135 00:07:25,430 --> 00:07:25,850 OK. 136 00:07:25,910 --> 00:07:29,420 Android developer of course are U.S. developers of course and undervalues. 137 00:07:29,460 --> 00:07:29,870 OK. 138 00:07:29,960 --> 00:07:33,560 So if you have a simple list view in our application. 139 00:07:33,590 --> 00:07:39,740 So now I want to actually do something up when the user clicks on one of these items inside of this 140 00:07:39,740 --> 00:07:40,580 list list. 141 00:07:40,610 --> 00:07:41,280 OK. 142 00:07:41,330 --> 00:07:45,260 So for that purpose we need to actually implement an interface. 143 00:07:45,260 --> 00:07:49,460 So here just typing implements our adapter view. 144 00:07:49,930 --> 00:07:50,540 OK. 145 00:07:50,590 --> 00:07:55,730 Dot on item click listener. 146 00:07:55,850 --> 00:07:56,260 OK. 147 00:07:56,420 --> 00:08:03,310 We need to actually implement this on item calculus and in interface as you can see here and here inside 148 00:08:03,310 --> 00:08:08,470 of these uncreate MF'er First of all let's actually create an object of type list view. 149 00:08:08,600 --> 00:08:10,260 So they've been here at least we do. 150 00:08:10,370 --> 00:08:18,260 And the name of our object is LS The View assignment operator and and here I want to actually call MFL 151 00:08:18,320 --> 00:08:21,830 that we actually inherit from this list activity class. 152 00:08:21,860 --> 00:08:26,590 So here after the assignment operator just type in here gets list view. 153 00:08:27,050 --> 00:08:33,050 So as you can see here this method is going to actually get the list view of our application and that 154 00:08:33,080 --> 00:08:36,680 is going to actually assign that view to this object elative you. 155 00:08:36,680 --> 00:08:43,050 So if we actually hold the command key and press on this method method here as you can see. 156 00:08:43,240 --> 00:08:48,330 So this method is actually inside this list activity the Java file and this is our method. 157 00:08:48,350 --> 00:08:48,910 OK. 158 00:08:49,160 --> 00:08:52,120 So let's go back inside this main activity there job of file here. 159 00:08:52,370 --> 00:08:58,830 And after this line of code in line 25 this actually refers to the name of this object. 160 00:08:58,850 --> 00:09:07,360 LS The View that sits on item as you can see here sits an item. 161 00:09:07,370 --> 00:09:13,490 Click listen here and here inside of these Apprentice's you need to actually putting a value of type 162 00:09:13,580 --> 00:09:14,760 on item click listener. 163 00:09:14,900 --> 00:09:21,200 So because this main activity class is actually implementing this and after that an item click listener 164 00:09:21,290 --> 00:09:23,390 interface as you can see here. 165 00:09:23,390 --> 00:09:30,050 So there is an ease or relationship between these two or between these main activity class and these 166 00:09:30,090 --> 00:09:31,940 are items like listener interface. 167 00:09:31,940 --> 00:09:38,650 So here I can just typing a main activity dot this. 168 00:09:39,230 --> 00:09:44,800 OK here I am specifying that this main activity that class is going to be the listener. 169 00:09:44,990 --> 00:09:45,600 OK. 170 00:09:45,890 --> 00:09:52,820 And then after the ending curly brace of these uncreate Smurfette here as you can see we need to actually 171 00:09:52,820 --> 00:09:54,740 implement as you can see here. 172 00:09:55,100 --> 00:10:03,930 It says classman activity must either be declared abstract or implement abstract method on item click 173 00:10:04,160 --> 00:10:04,540 here. 174 00:10:04,580 --> 00:10:05,180 As you can see. 175 00:10:05,190 --> 00:10:10,490 So here are after the ending calibrates of this uncreate Meffert and inside of this main activity class 176 00:10:10,840 --> 00:10:14,260 let's actually override this method. 177 00:10:14,270 --> 00:10:15,240 All right click here. 178 00:10:15,260 --> 00:10:18,650 As you can see here and then our person enter key on your keyboard.