1 00:00:00,380 --> 00:00:01,200 Hire one. 2 00:00:01,320 --> 00:00:07,790 So in this story are you going to take a look at our maps activity that we created in the previous tutorial. 3 00:00:08,070 --> 00:00:14,460 So let's actually double click on the step here that has maps activity there so that this area is actually 4 00:00:14,460 --> 00:00:22,380 voiture and you can see that we have this maps activity class that extends fragment activity and implements 5 00:00:22,470 --> 00:00:25,320 on map ready callback interface. 6 00:00:25,440 --> 00:00:26,070 Right. 7 00:00:26,160 --> 00:00:32,870 And you can see that this instance variable is already created for us private Google map a map. 8 00:00:32,950 --> 00:00:35,370 So map means actually a member variable. 9 00:00:35,370 --> 00:00:36,870 This means member. 10 00:00:37,020 --> 00:00:40,250 So this is actually another name for instance variables. 11 00:00:40,530 --> 00:00:45,210 And here you can see that we have this uncreate method here. 12 00:00:45,210 --> 00:00:49,530 So first it's going to actually call this superadded uncreate method and then it's going to call the 13 00:00:49,530 --> 00:00:52,640 set content if you are totally out of that activity Underland map. 14 00:00:52,640 --> 00:00:59,310 So this is the XML file that is actually generated for us when we created this activity and we have 15 00:00:59,310 --> 00:01:05,700 this support map fragment map fragment get support map fragments managers that find fragments by ID 16 00:01:05,720 --> 00:01:12,900 or ID that map and is going to actually call this map a cinch Meffert on this map fragment here and 17 00:01:12,900 --> 00:01:15,170 it's going to pass the context here which is this. 18 00:01:15,510 --> 00:01:21,600 So these codes are necessary if you want to actually use the maps in Android. 19 00:01:21,600 --> 00:01:24,530 So that's why you see the maps on your emulator. 20 00:01:24,540 --> 00:01:27,650 When we actually land the application into previous tutorials. 21 00:01:28,080 --> 00:01:33,830 So now we can see that we have these interface on the map for the callback interface. 22 00:01:33,930 --> 00:01:41,200 So let's open our Android documentation's And let's see what is this on my pretty callback interface. 23 00:01:41,430 --> 00:01:43,970 So here we can see that this is the android documentation. 24 00:01:44,010 --> 00:01:51,630 So inside the search bar let's search for unmap ready on map ready. 25 00:01:52,670 --> 00:01:54,750 Call interface so let's click on it. 26 00:01:55,130 --> 00:01:56,720 Let's wait a little bit here. 27 00:01:57,620 --> 00:02:01,240 And here it says public interface on my protocol. 28 00:02:01,640 --> 00:02:05,580 Colorizing interface for forwent the map is ready to be used. 29 00:02:05,780 --> 00:02:06,300 OK. 30 00:02:06,470 --> 00:02:14,180 Once an instance of this interface is set on a map fragment or map view object the unmap ready Google 31 00:02:14,180 --> 00:02:18,220 Map method is triggered when the map is ready to be used. 32 00:02:18,350 --> 00:02:22,200 And provides a non-null instance of Google map. 33 00:02:22,520 --> 00:02:30,980 So this actually the interface here is actually going to be called when the map is ready. 34 00:02:30,980 --> 00:02:31,410 Right. 35 00:02:31,430 --> 00:02:35,350 So for example if I show you the emulator you can see that the map is right here right. 36 00:02:35,510 --> 00:02:37,680 And this means that the map is now ready. 37 00:02:37,700 --> 00:02:39,790 And if you go back to I understood you. 38 00:02:39,890 --> 00:02:45,200 So instead this interface we have in effect that must be implemented here and that if it is this one 39 00:02:45,500 --> 00:02:46,820 on map ready. 40 00:02:46,910 --> 00:02:52,050 So when the map is ready and can be actually shown to the user this method is going to be called. 41 00:02:52,400 --> 00:02:57,130 And this means that the codes inside the inside of this movie is going to be executed. 42 00:02:57,380 --> 00:03:03,650 So you can see that first it's going to initialize this map instance variable by passing the Google 43 00:03:03,650 --> 00:03:09,860 Map argument to this area but to this instance variable and it says add a marker in Sydney and move 44 00:03:09,860 --> 00:03:10,790 the camera. 45 00:03:10,790 --> 00:03:17,120 So first it's going to actually specify the latitude and longitude of the specific location that the 46 00:03:17,600 --> 00:03:22,490 map is going to that the map is going to actually show it to the user that specific location. 47 00:03:22,490 --> 00:03:26,820 So by default the location is in Sydney Australia. 48 00:03:27,110 --> 00:03:32,350 So you can see that the latitude is this route and the longitude is this value and it's going to actually 49 00:03:32,450 --> 00:03:34,970 add a marker to that specific location. 50 00:03:34,970 --> 00:03:39,110 So new options that position certainly the total market in Sydney. 51 00:03:39,260 --> 00:03:44,570 So let me show you that the emulator so you can see that this market here is in Sydney. 52 00:03:44,570 --> 00:03:49,020 And if I actually click on this here you can see that it's a market in Sydney. 53 00:03:49,040 --> 00:03:51,080 So this is the title right. 54 00:03:51,260 --> 00:03:56,930 And it has a map to move camera chamcha update's factory that Noul at length Sydney. 55 00:03:57,110 --> 00:04:02,360 So it's going to actually move the camera to this specific location here inside our map if you want 56 00:04:02,360 --> 00:04:05,640 to I can actually change the place of this camera here. 57 00:04:05,720 --> 00:04:11,270 But if you put this code here and map that move camera you are actually calling this live on this map 58 00:04:11,510 --> 00:04:16,500 and it's going to move this camera to this specific location here right Sidney. 59 00:04:16,540 --> 00:04:22,290 So that's on here let us go back to and read documentation. 60 00:04:22,340 --> 00:04:26,900 So now it's as if Google Play services is not installed on the device. 61 00:04:26,900 --> 00:04:29,470 The user will be prompted to install it. 62 00:04:29,750 --> 00:04:38,120 And the unmap ready if it will only be triggered when the user has installed it and returns to the app. 63 00:04:38,450 --> 00:04:45,610 So it says publish if it's somebody on my thready right so called Vandemark is ready to be used. 64 00:04:46,410 --> 00:04:50,340 So you can actually read these documentations here. 65 00:04:50,360 --> 00:04:53,770 So let's go back to our Android studio here. 66 00:04:53,900 --> 00:04:59,450 And here I just wanted to actually give you some explanations about this activity the Smurfs activity 67 00:04:59,450 --> 00:05:06,110 that is actually created here that we just created in the previous tutorials and you can see that these 68 00:05:06,110 --> 00:05:09,110 codes are generated for us automatically. 69 00:05:09,110 --> 00:05:09,470 Right. 70 00:05:09,590 --> 00:05:12,100 You can you can also read these comments here. 71 00:05:12,350 --> 00:05:15,340 It says manipulates the map of what's available. 72 00:05:15,410 --> 00:05:17,990 This callback is triggered and the map is ready to be used. 73 00:05:17,990 --> 00:05:24,050 So you can see that we have also have a description of this on my protocol interface. 74 00:05:24,080 --> 00:05:28,880 This is where we can add markers or lines of listeners or move the camera. 75 00:05:28,880 --> 00:05:32,900 In this case we just add a mulcher near Sydney Australia. 76 00:05:33,110 --> 00:05:38,540 If Google Play services is not installed on the device the user will be prompted to install it and install 77 00:05:38,570 --> 00:05:41,220 Google Play services and return to the map. 78 00:05:41,270 --> 00:05:42,350 So that's it. 79 00:05:42,350 --> 00:05:46,800 And I think that's enough for the situation if you have any questions about the concepts that they touch 80 00:05:46,820 --> 00:05:49,000 in this lesson and please post discussion in of course. 81 00:05:49,250 --> 00:05:51,440 And then I do my best to answer all of your questions. 82 00:05:51,440 --> 00:05:54,780 Thank you very much for watching and I'll see you in the next tutorial.