1 00:00:00,240 --> 00:00:06,420 The first one is the unsaved instance state and as I can see here you are inheriting this never from 2 00:00:06,420 --> 00:00:12,480 the superclass activity and this if it should accept an argument of type bundle and the name of this 3 00:00:12,630 --> 00:00:19,930 argument is saved instance state and in line 86 we are actually in the supervision of this if it's that 4 00:00:20,030 --> 00:00:27,240 super unsafe instance State save instance that we are passing this argument here and in line 88 we are 5 00:00:27,240 --> 00:00:32,770 actually creating a host object and we want to show dismiss to the user on save instance. 6 00:00:32,810 --> 00:00:33,630 It is called. 7 00:00:33,630 --> 00:00:37,220 So I want to let the user know Vendy Smurfette is actually being called. 8 00:00:37,290 --> 00:00:44,380 And here we have this unrestored instance that as you can see here and again this is actually an effort 9 00:00:44,400 --> 00:00:47,270 that we are inheriting from the superclass. 10 00:00:47,280 --> 00:00:52,750 And as you can see in line 94 you're actually calling it the super version of the Smurfette. 11 00:00:53,070 --> 00:00:58,920 And in 96 I actually created a tossed object in order to let the user know when this method is going 12 00:00:58,920 --> 00:01:03,120 to be called on unrestored instance statement for this card. 13 00:01:03,120 --> 00:01:07,450 So let's run our project and see Wendy's or Android lifecycle. 14 00:01:07,480 --> 00:01:09,050 My efforts are going to be called. 15 00:01:09,150 --> 00:01:12,750 So I hate to hit the run button here and then click on OK. 16 00:01:12,860 --> 00:01:17,870 The uncreate for this called the unstarted if it is called the on resume if it is called Right. 17 00:01:17,880 --> 00:01:22,820 So first the create method is called and then the on if it is called. 18 00:01:22,830 --> 00:01:25,100 And finally the andr's your method is called. 19 00:01:25,110 --> 00:01:29,220 So now our application is actually in the resume state as you can see here. 20 00:01:29,490 --> 00:01:34,720 So now let's actually click on the spot and here and here as you can see we have this high stakes here. 21 00:01:34,740 --> 00:01:35,510 OK. 22 00:01:35,580 --> 00:01:42,510 So let's actually rotate the device rotate right and change the device orientation as you can see here 23 00:01:43,930 --> 00:01:46,570 and now you can see the positive for this card. 24 00:01:46,710 --> 00:01:52,550 And then the save instance is called and unstopped met for this card and undestroyed of this card. 25 00:01:52,710 --> 00:01:54,980 And finally again the uncreate for this card. 26 00:01:54,990 --> 00:01:59,000 And unstarted if it is called and Andreas for instance it is called. 27 00:01:59,010 --> 00:02:02,140 And finally the resume if it is called. 28 00:02:02,190 --> 00:02:08,370 So let me actually go inside these Meffert these are let's create a them if it here as you can see and 29 00:02:08,370 --> 00:02:12,200 change these short to lend long. 30 00:02:12,710 --> 00:02:14,960 And let's run our project again. 31 00:02:15,060 --> 00:02:18,540 Let me get you to change the orientation again to vertical. 32 00:02:18,630 --> 00:02:24,510 First of all the uncreate if it is caught right and then the On-Star if it is called as you can see 33 00:02:24,510 --> 00:02:25,200 here. 34 00:02:25,230 --> 00:02:27,190 And finally and if for this card. 35 00:02:27,240 --> 00:02:27,960 OK. 36 00:02:28,230 --> 00:02:32,220 So if I actually click on the spot in here and as you can see if you have this high stakes here. 37 00:02:32,220 --> 00:02:32,790 OK. 38 00:02:32,820 --> 00:02:39,150 So let's actually change the orientation of our device and let's see what our what if it's the Android 39 00:02:39,150 --> 00:02:41,810 lifecycle are all going to be called. 40 00:02:42,600 --> 00:02:49,530 So first the puzzle if it is called as you can see here and then the and save instance state is called. 41 00:02:50,130 --> 00:02:53,060 And then the unstopped method is called as you can see. 42 00:02:53,310 --> 00:02:58,230 And finally the undestroyed if it is called and again it's going to actually call the uncreate Meffert 43 00:02:58,290 --> 00:03:06,690 as you can see here and then the unstored nefarious card and on list for instance state if it is called 44 00:03:07,200 --> 00:03:09,210 an honorary Z if it is called. 45 00:03:09,630 --> 00:03:10,780 OK. 46 00:03:10,890 --> 00:03:13,620 And as you can see here we can see that's the text here. 47 00:03:13,620 --> 00:03:17,860 So here I want to show you that in order to save our data. 48 00:03:17,940 --> 00:03:24,060 When the device orientation is actually changed we need to actually save our data inside this and save 49 00:03:24,060 --> 00:03:30,780 instance state and we can actually retrieve our data inside this on restore instances. 50 00:03:31,120 --> 00:03:33,710 So insight is unsafe in a sense state. 51 00:03:33,800 --> 00:03:39,670 I can actually save the value that is in sight of this text view here. 52 00:03:39,750 --> 00:03:46,710 So to use hide the set text string value right here I am actually setting the value of this string value 53 00:03:46,950 --> 00:03:50,480 to this and that to the set text Meffert of this takes the high. 54 00:03:50,580 --> 00:03:51,120 OK. 55 00:03:51,360 --> 00:03:54,290 So I want to actually save this value string back to you. 56 00:03:54,480 --> 00:03:56,070 So let's see how we can do that. 57 00:03:56,070 --> 00:04:01,510 Let's go inside this unsafe instance state and here as you can see we have these arguments right which 58 00:04:01,510 --> 00:04:04,400 is of type Bondel save instance that. 59 00:04:04,410 --> 00:04:06,350 So what you want to do here. 60 00:04:06,540 --> 00:04:13,010 Here I want to actually save the value that is actually assigned to these takes you takes the high. 61 00:04:13,050 --> 00:04:17,330 So what is the value that is assigned to the stakes through this string value here as you can see is 62 00:04:17,340 --> 00:04:19,350 actually assigned to this view. 63 00:04:19,530 --> 00:04:26,100 And as you can see here in line 15 inside this main activity class I declared this variable this string 64 00:04:26,130 --> 00:04:27,640 object inside this class. 65 00:04:27,810 --> 00:04:33,950 So I want to save this value when the device orientation is changed and then retrieve that value. 66 00:04:34,140 --> 00:04:40,010 So in order to save this value we need to actually go inside this onstage instance State Mefford here 67 00:04:40,170 --> 00:04:45,660 and here I can actually save that value by referring to this argument that we received as as an argument 68 00:04:45,660 --> 00:04:48,430 here as you can see of the Smurfette from the Smurfit. 69 00:04:48,600 --> 00:04:55,720 I can actually type in save instance state here that's put as he has. 70 00:04:55,720 --> 00:05:00,770 Here we have lots of misfits here put strange point ain't Boullion food. 71 00:05:00,820 --> 00:05:05,850 All put binder put bundle put put bite put bite away. 72 00:05:05,920 --> 00:05:10,800 So if DMF at that I actually am actually interested here is this MF'er put strange. 73 00:05:11,200 --> 00:05:18,220 So this if it accepts two argument the first one is going to be the key that you want to actually assign 74 00:05:18,490 --> 00:05:22,080 for this value that you want to save in memory. 75 00:05:22,090 --> 00:05:25,800 The key is very important because later that you want to retrieve this value. 76 00:05:25,900 --> 00:05:31,360 I need to actually refer to the name of that key in order to retrieve the the actual value. 77 00:05:31,420 --> 00:05:37,710 So I need to put two double quotes here so as you can see here are the data type of this key is is string. 78 00:05:37,930 --> 00:05:44,590 So the key is going to be capitalized and the name of the key is going to be strange value because I 79 00:05:44,590 --> 00:05:48,060 want to actually save the value of the string value value. 80 00:05:48,110 --> 00:05:52,210 OK what you want to save in memory when the device orientation is actually changed. 81 00:05:52,510 --> 00:05:58,510 I want to actually save the value of the string value of value right here as you can see if you have 82 00:05:58,510 --> 00:06:03,610 this string value variable here and in Enceladus this uncle that I am actually assigning this value 83 00:06:03,610 --> 00:06:06,890 high to the string value and in line first 88. 84 00:06:06,910 --> 00:06:11,770 I am actually assigning this value to this set text method of this takes few takes the high. 85 00:06:11,880 --> 00:06:19,480 So I want to save that value string value so I can just refer to the name of that variable string value. 86 00:06:19,510 --> 00:06:26,650 So because I actually declared this valuable inside this class main activity I can refer to the name 87 00:06:26,650 --> 00:06:31,200 of that variable here inside this unsafe instance method. 88 00:06:31,420 --> 00:06:32,080 OK. 89 00:06:32,440 --> 00:06:38,950 So inside this on restore instance state I can actually retrieve that value when the device orientation 90 00:06:38,950 --> 00:06:40,060 is actually changed. 91 00:06:40,300 --> 00:06:47,830 So let me actually once again change the orientation of these are the ways to vertical as you can see 92 00:06:47,830 --> 00:06:48,270 here. 93 00:06:48,280 --> 00:06:55,510 Now you can see the unpause method is called and then the save instance it is called and then the unstopped 94 00:06:55,550 --> 00:06:59,880 if it is caused as you can see here and then the undestroyed Meffert is called. 95 00:06:59,920 --> 00:07:00,720 OK. 96 00:07:00,850 --> 00:07:06,760 And again it's going to cause the uncreate Meffert as you can see and then the unstuffed if it is called 97 00:07:08,280 --> 00:07:13,040 and unrestored instance state if it is called So here we can actually retrieve the data. 98 00:07:13,240 --> 00:07:15,260 Is always thought instances state. 99 00:07:15,390 --> 00:07:21,290 So inside this unrestored instance of state I can try to retrieve the data that I actually saved inside 100 00:07:21,300 --> 00:07:23,820 this and save instance that. 101 00:07:23,910 --> 00:07:25,740 So how can I actually get the data. 102 00:07:25,890 --> 00:07:32,810 So first of all I can I try to refer to the name of that strange value valuable assignment operator. 103 00:07:32,820 --> 00:07:38,420 So I want to actually retrieve that data and assign them again to this variable string value. 104 00:07:38,430 --> 00:07:44,100 So here I just need to refer to the name of this object which is of type bundle that they actually receive 105 00:07:44,100 --> 00:07:45,790 as an argument from the Smurfette. 106 00:07:45,870 --> 00:07:52,850 So here I can't just say I mean save instance state DOT get string. 107 00:07:52,880 --> 00:07:54,650 So you want to get a string value right. 108 00:07:54,830 --> 00:08:01,400 And here I just need to pass the key that I actually sign here that I actually specified inside this 109 00:08:01,700 --> 00:08:03,320 unsafe instance state. 110 00:08:03,320 --> 00:08:08,870 So I just need to copy this key here and put it inside these tabs of course here and at the end of my 111 00:08:08,870 --> 00:08:11,240 statement I need to put a semi-colon. 112 00:08:11,600 --> 00:08:16,790 And here again I just need to refer to the name of this th the high that set text. 113 00:08:17,240 --> 00:08:19,480 And here I can just refer to the name of this value. 114 00:08:19,520 --> 00:08:25,780 But again strange value valuable because I am actually assigning this value to the string value variable 115 00:08:25,900 --> 00:08:29,030 trees string value variable and in line one hundred and four. 116 00:08:29,070 --> 00:08:31,920 I am actually assigning that value to this. 117 00:08:32,020 --> 00:08:34,570 So it takes two of these to actually Heidi. 118 00:08:34,580 --> 00:08:35,590 OK. 119 00:08:36,080 --> 00:08:38,900 So let's run our project again and see what happens. 120 00:08:38,960 --> 00:08:43,880 So now we can see our application is running the uncreate method is called the On-Star. 121 00:08:43,880 --> 00:08:51,170 If it is called as you can see here and then the resume if it is called here and now my application 122 00:08:51,170 --> 00:08:54,520 is actually in the honors you actually state. 123 00:08:54,560 --> 00:08:55,180 OK. 124 00:08:55,190 --> 00:08:56,550 So let's actually click on this button. 125 00:08:56,570 --> 00:08:58,010 Hi. 126 00:08:58,010 --> 00:09:00,980 So let's actually change the orientation of this device. 127 00:09:00,980 --> 00:09:06,800 And now the on pause for this card as you can see and at the same instance it is called. 128 00:09:06,800 --> 00:09:13,120 So here I actually saved the value of this takes unstopped my faith is called undestroyed if it is called. 129 00:09:13,160 --> 00:09:13,930 OK. 130 00:09:14,390 --> 00:09:18,460 And then the uncreate method is called as you can see. 131 00:09:18,620 --> 00:09:20,980 After that the start of it is called. 132 00:09:21,290 --> 00:09:25,380 And finally as you can see here and race for instance the method is called. 133 00:09:25,400 --> 00:09:29,400 So here as you can see when I try to reach retrieving that data. 134 00:09:29,680 --> 00:09:34,600 When the when the actually application is actually changed its orientation and the device is there to 135 00:09:34,590 --> 00:09:36,210 change its orientation. 136 00:09:36,230 --> 00:09:40,410 So now as you can see now is this data is actually safe. 137 00:09:40,430 --> 00:09:42,770 We can see the value of this this view here. 138 00:09:42,920 --> 00:09:45,370 And if I change the orientation again. 139 00:09:45,710 --> 00:09:50,750 Now you can see that the data is actually saved and it's not actually gone. 140 00:09:50,750 --> 00:09:55,960 So hopefully that makes sense and I think that's enough for this whole year. 141 00:09:55,970 --> 00:10:01,100 So if you have any questions please post the discussion in the course and then I'll do my best to answer 142 00:10:01,430 --> 00:10:02,810 all of your questions. 143 00:10:02,810 --> 00:10:04,000 Thank you very much for watching. 144 00:10:04,000 --> 00:10:05,450 And I see you in the next the.