1 00:00:00,150 --> 00:00:06,150 Hire everyone in this theater we're going to go ahead and create another Android application. 2 00:00:06,150 --> 00:00:07,160 So just click on this. 3 00:00:07,170 --> 00:00:09,560 Start in your Android studio project. 4 00:00:09,630 --> 00:00:22,510 So here for the application name just type in an app 51 dash Android lifecycle OK life cycle and then 5 00:00:22,640 --> 00:00:24,480 click Next choose. 6 00:00:24,520 --> 00:00:30,370 AP 16 Android 4.1 Jelly Bean for minimum STK phone and tablet. 7 00:00:30,400 --> 00:00:30,890 OK. 8 00:00:30,970 --> 00:00:35,170 Next on here choose Blanche activity next. 9 00:00:35,500 --> 00:00:36,970 And then click can finish. 10 00:00:37,090 --> 00:00:37,820 OK. 11 00:00:38,020 --> 00:00:43,960 Now let's actually select this hello world takes you here and then present the key on your keyboard 12 00:00:44,320 --> 00:00:46,450 and then it's actually go inside the stress folder. 13 00:00:46,500 --> 00:00:52,870 Lay out activity on the line make that example and then select is faluting action button and then press 14 00:00:52,870 --> 00:00:54,200 and delete key on your keyboard. 15 00:00:54,200 --> 00:01:00,580 OK so now let's actually go back and say this main activity the double file here and then let's actually 16 00:01:00,580 --> 00:01:06,850 delete these lines of code that are related to the Options menu and then deletes these lines of code 17 00:01:06,850 --> 00:01:09,940 that are related to the floating action button. 18 00:01:09,940 --> 00:01:15,050 Now I want to actually put in some more efforts inside inside of this class. 19 00:01:15,070 --> 00:01:15,590 OK. 20 00:01:15,880 --> 00:01:19,690 So as you can see this is the uncreate method. 21 00:01:19,720 --> 00:01:20,460 OK. 22 00:01:20,620 --> 00:01:23,840 This is actually one of the Android lifecycle efforts. 23 00:01:23,890 --> 00:01:29,070 And now I want to add the other lifecycle methods inside this main activity class. 24 00:01:29,080 --> 00:01:29,680 OK. 25 00:01:29,830 --> 00:01:36,370 So first of all inside these are made I create if you want to actually create a toast in order to show 26 00:01:36,370 --> 00:01:37,600 the user a message. 27 00:01:37,660 --> 00:01:38,850 When my application runs. 28 00:01:38,860 --> 00:01:39,290 OK. 29 00:01:39,430 --> 00:01:44,600 So first of all in order to create a toast I need to refer to the name of the toaster class. 30 00:01:44,650 --> 00:01:46,300 Ok toast. 31 00:01:46,350 --> 00:01:46,820 OK. 32 00:01:46,900 --> 00:01:49,300 That makes text. 33 00:01:49,360 --> 00:01:52,850 So as you can see this cross-class has an effect. 34 00:01:52,900 --> 00:01:58,570 A static method actually that we can call on this class or keep this in if it is a class my faith so 35 00:01:58,570 --> 00:02:01,110 that we can call this method on this class. 36 00:02:01,120 --> 00:02:01,660 OK. 37 00:02:01,870 --> 00:02:06,070 And inside of the apprentice's of this Meffert we need to specify free arguments. 38 00:02:06,100 --> 00:02:11,160 Ok so here for the first argument we need to specify the context. 39 00:02:11,170 --> 00:02:11,610 OK. 40 00:02:11,710 --> 00:02:15,530 So for the context context we can actually refer to that to this class. 41 00:02:15,560 --> 00:02:17,010 OK so this. 42 00:02:17,060 --> 00:02:18,350 OK comma. 43 00:02:18,650 --> 00:02:23,050 And now I need to specify the text that you want to show to show the user. 44 00:02:23,050 --> 00:02:28,490 OK so I just need to put in two double quotes and instead of double quotes I can just type in but the 45 00:02:28,660 --> 00:02:41,810 UN create Meffert is called ok and comma and then I need to actually specify the duration of my message 46 00:02:41,810 --> 00:02:46,670 or cater to change the direction of the message that is being shown to the user. 47 00:02:46,670 --> 00:02:48,500 So here I can just type in TOSed 48 00:02:51,140 --> 00:02:53,530 dot land line. 49 00:02:53,880 --> 00:02:54,440 OK. 50 00:02:54,700 --> 00:02:59,330 And now I need to actually call them if it's show on this method. 51 00:02:59,350 --> 00:02:59,630 OK. 52 00:02:59,780 --> 00:03:04,600 Undismayed text Meffert so that show. 53 00:03:04,650 --> 00:03:07,910 OK so now it's going to actually show this message message to the user. 54 00:03:07,930 --> 00:03:08,660 OK. 55 00:03:09,010 --> 00:03:12,790 So let's actually add the other benefits here. 56 00:03:13,030 --> 00:03:15,710 After the end in Kerley place of this uncreate Moffet. 57 00:03:15,820 --> 00:03:19,500 Now I want to add the other lifecycle benefits to this class. 58 00:03:19,510 --> 00:03:23,400 So the other lifecycle Mefford is the Meffert on start. 59 00:03:23,440 --> 00:03:27,790 OK so I'm going to paste this method here and then I'm going to explain to you what's going on here. 60 00:03:27,820 --> 00:03:30,080 So as you can see here this is the method on starts. 61 00:03:30,190 --> 00:03:30,880 OK. 62 00:03:31,240 --> 00:03:37,270 And as you can see the return type of the sign if it is void and the name of this if it is on start. 63 00:03:37,330 --> 00:03:37,800 OK. 64 00:03:37,810 --> 00:03:43,760 And as you can see here the access modifier of this method is protected and this means that this method 65 00:03:43,780 --> 00:03:49,180 is only visible to the class that this it is actually created and there are some classes that inherit 66 00:03:49,390 --> 00:03:50,560 from this class. 67 00:03:50,680 --> 00:03:51,350 OK. 68 00:03:51,710 --> 00:03:56,760 And as you can see here in say that this May 5th we are calling the super that Arne's and starts Moffit. 69 00:03:56,930 --> 00:04:01,130 OK as we did for this uncreate benefit super that uncreate. 70 00:04:01,600 --> 00:04:08,310 And now as you can see we actually created this toast here talks that make text. 71 00:04:08,410 --> 00:04:12,340 This this is for the context of this application. 72 00:04:12,820 --> 00:04:19,570 OK if you are referring to this class main activity that that is actually controlling the current activity 73 00:04:19,600 --> 00:04:20,930 underline may not examine. 74 00:04:21,060 --> 00:04:21,750 OK. 75 00:04:22,210 --> 00:04:26,700 And here this is the text of our toast and starts Meffert is called. 76 00:04:26,950 --> 00:04:27,490 OK. 77 00:04:27,760 --> 00:04:29,420 And here the duration of the text. 78 00:04:29,440 --> 00:04:30,010 OK. 79 00:04:30,250 --> 00:04:33,010 To toast that line like that. 80 00:04:33,010 --> 00:04:33,630 Sure. 81 00:04:33,910 --> 00:04:34,400 OK. 82 00:04:34,420 --> 00:04:37,870 And here we are actually showing that message to the user. 83 00:04:37,870 --> 00:04:40,260 Now let's actually look at the other lifecycle Mefford. 84 00:04:40,360 --> 00:04:45,010 So here I'm going to paste this method here and then I'm going to explain to you what's going on here. 85 00:04:45,010 --> 00:04:45,800 OK. 86 00:04:45,970 --> 00:04:49,780 So as you can see here the other it is always do OK. 87 00:04:49,810 --> 00:04:53,760 So for the first time that this application is actually going to start. 88 00:04:53,770 --> 00:04:57,330 So the first method that is going to be called is this method. 89 00:04:57,370 --> 00:04:58,130 Uncreate. 90 00:04:58,240 --> 00:04:58,660 OK. 91 00:04:58,810 --> 00:05:01,360 And then it's going to show this message to the user. 92 00:05:01,720 --> 00:05:06,430 And the second half that this is going to be called is this unstopped method. 93 00:05:06,490 --> 00:05:07,240 OK. 94 00:05:07,690 --> 00:05:12,310 And this message is going to be shown to the user and the first method that is going to be called is 95 00:05:12,310 --> 00:05:13,590 this on resume Meffert. 96 00:05:13,600 --> 00:05:20,750 OK as you can see and here it says TOSed that make text this and resume if it is called toast. 97 00:05:20,770 --> 00:05:22,260 That red flag does show. 98 00:05:22,330 --> 00:05:28,020 OK so now let's actually run our project and see what happens. 99 00:05:28,030 --> 00:05:28,640 OK. 100 00:05:31,510 --> 00:05:38,100 So as you can see the uncreate method is called the on start method is called and then the resume if 101 00:05:38,100 --> 00:05:39,430 it is actually called. 102 00:05:39,580 --> 00:05:40,230 OK. 103 00:05:41,020 --> 00:05:45,290 So now let's actually call the other Democrats here it's actually create. 104 00:05:45,330 --> 00:05:46,190 All right. 105 00:05:46,240 --> 00:05:49,690 The other lifecycle fits inside of this class. 106 00:05:50,010 --> 00:05:50,230 OK. 107 00:05:50,230 --> 00:05:52,700 Inside of this main activity class. 108 00:05:52,760 --> 00:05:58,850 So the other lifecycle Meffert that you want to put inside of this class is the unpause may. 109 00:05:58,960 --> 00:06:01,720 So as you can see here this is the unposed Meffert. 110 00:06:01,930 --> 00:06:03,060 OK. 111 00:06:03,220 --> 00:06:08,770 And here as you can see I'm going to actually show this message to the user when this application is 112 00:06:08,770 --> 00:06:10,500 actually on the unpassed state. 113 00:06:10,510 --> 00:06:11,110 OK. 114 00:06:11,410 --> 00:06:17,000 And now I want to actually override the other lifecycle effect here inside of this class. 115 00:06:17,110 --> 00:06:22,060 So now I'm going actually pasting the other lifecycle effect inside of this class. 116 00:06:22,120 --> 00:06:22,540 OK. 117 00:06:22,660 --> 00:06:27,650 So as you can see here the other lifecycle method is these unrestored Mefford. 118 00:06:27,900 --> 00:06:28,490 OK. 119 00:06:28,780 --> 00:06:32,800 And here I'm going to actually show this message to the user and it is unrestored. 120 00:06:32,850 --> 00:06:34,080 It is called. 121 00:06:34,450 --> 00:06:35,380 OK. 122 00:06:35,870 --> 00:06:41,080 And now let's actually put in the other lifecycle my it inside of this class. 123 00:06:41,230 --> 00:06:44,940 So the other lifecycle Mefford is undestroyed Meffert. 124 00:06:44,950 --> 00:06:45,490 OK. 125 00:06:45,640 --> 00:06:49,150 So this method is going to be called Venda application. 126 00:06:49,160 --> 00:06:57,490 Vendy activity is actually completely destroyed and we cannot and the activity is not stored in memory 127 00:06:57,490 --> 00:06:58,130 anymore. 128 00:06:58,350 --> 00:06:58,770 OK. 129 00:06:58,870 --> 00:07:02,780 So some of it undestroyed is going to be called in that specific time. 130 00:07:02,950 --> 00:07:07,230 And this message on the stream if it is called is going to be shown to the user. 131 00:07:07,270 --> 00:07:11,880 OK so now let's actually run our project and see what happens. 132 00:07:11,920 --> 00:07:12,780 OK. 133 00:07:13,570 --> 00:07:16,240 So as you can see the uncreate Mfat is called. 134 00:07:16,330 --> 00:07:16,780 OK. 135 00:07:16,930 --> 00:07:22,510 And then the unstarted if it is called here and then the on resume if it is called. 136 00:07:22,620 --> 00:07:26,400 Ok so now our application is actually under our resumes. 137 00:07:26,410 --> 00:07:26,950 OK. 138 00:07:27,160 --> 00:07:31,240 So now if I actually click on dispatch button let's see what happens. 139 00:07:31,300 --> 00:07:36,470 So now let's actually click on dispatch button here and let's see what happens. 140 00:07:36,490 --> 00:07:37,140 OK. 141 00:07:37,450 --> 00:07:39,780 So as you can see here the opposite effect is called. 142 00:07:39,940 --> 00:07:42,090 And then the undestroyed method is called. 143 00:07:42,100 --> 00:07:47,680 So now the app our application is actually completely destroyed and it is not stored in memory anymore. 144 00:07:47,920 --> 00:07:54,700 OK so now I can actually go back to our application I want to start my application again. 145 00:07:54,730 --> 00:08:02,030 So here inside this main menu I can actually search for my application as you can see. 146 00:08:02,350 --> 00:08:05,860 This is our app effective on Android lifecycle. 147 00:08:06,010 --> 00:08:10,930 So the uncreate my is called the On-Star my faith is called. 148 00:08:11,730 --> 00:08:13,680 And then the resume if it is caught. 149 00:08:13,680 --> 00:08:16,770 So now our application is in the andr's state. 150 00:08:16,770 --> 00:08:17,310 OK. 151 00:08:17,400 --> 00:08:20,080 So here I want to actually to go to the home. 152 00:08:20,130 --> 00:08:20,770 OK. 153 00:08:20,910 --> 00:08:23,660 So the home screen of my emulator. 154 00:08:23,760 --> 00:08:30,390 So I just need to click on this little circle here as you can see and as you can see the on plasma if 155 00:08:30,390 --> 00:08:31,360 it is called. 156 00:08:31,780 --> 00:08:36,100 And now our application is actually on the unpause state. 157 00:08:36,400 --> 00:08:36,990 OK. 158 00:08:37,050 --> 00:08:40,470 Now if you want to go back to my application let's see what happens here. 159 00:08:40,530 --> 00:08:47,490 As you can see if I click on this little square here now I can see the other applications up in the 160 00:08:47,490 --> 00:08:48,150 background. 161 00:08:48,150 --> 00:08:48,620 OK. 162 00:08:48,720 --> 00:08:51,020 So this application is actually in the background. 163 00:08:51,300 --> 00:08:54,810 And now if I selected unrestored MURPHY It is called. 164 00:08:55,030 --> 00:09:01,350 OK on start MFL this card and then the Andrew is you Mefford is going to be called. 165 00:09:01,350 --> 00:09:03,990 So again our application is on. 166 00:09:04,250 --> 00:09:05,710 Is your state. 167 00:09:05,900 --> 00:09:06,960 OK. 168 00:09:07,500 --> 00:09:09,270 So hopefully that makes sense. 169 00:09:09,270 --> 00:09:14,940 And if you have any questions about Android lifecycle please post the discussion in the course and I'll 170 00:09:14,970 --> 00:09:17,750 do my best to answer all of your questions. 171 00:09:17,760 --> 00:09:21,120 Thank you very much for watching and I'll see you in the next year Tauriel.