WEBVTT 00:00.040 --> 00:00.920 Welcome back. 00:00.960 --> 00:03.320 We finished from Uber Clue map. 00:03.320 --> 00:10.120 We created the box that contains Google Map, expandable fab and disappearing scale bar Composables. 00:10.160 --> 00:13.600 Now let's move to the Firebase section. 00:13.600 --> 00:20.400 We need to create Firebase Firestore database that stores markers. 00:20.400 --> 00:28.200 So when the user requests a ride his current location will be uploaded to the markers collection in 00:28.200 --> 00:30.280 Firebase Firestore database. 00:30.560 --> 00:38.440 Then received and retrieved by the driver in order to display the markers for the driver. 00:38.440 --> 00:43.720 So we have two types the driver and the user or a customer okay. 00:43.920 --> 00:47.560 So we have two types of permissions or users. 00:47.600 --> 00:54.480 The customer the the one who need a drive driver and the driver itself okay. 00:54.680 --> 01:01.900 So we need to upload the marker to Firebase Firestore following the MVVM architecture we're going to 01:01.900 --> 01:06.060 start with the new package called repository. 01:06.060 --> 01:11.220 So create a new repository package I'll name it as repositories. 01:11.380 --> 01:15.140 Inside this repository create a new Kotlin. 01:15.380 --> 01:20.220 You can create them in one file or you can make them in a separate file. 01:20.220 --> 01:24.700 We need the marker repository and the marker repository implementation. 01:24.700 --> 01:28.420 The first one is interface and the second one is a class. 01:28.620 --> 01:36.300 So as we learned before we have the interface for the repository and its implementation, which is a 01:36.300 --> 01:41.340 class I prefer to make everything separate and very clear. 01:41.460 --> 01:45.300 So let's start with marker repository. 01:45.300 --> 01:51.180 This interface for now has one function called add marker. 01:51.460 --> 01:59.180 So marker is of type lat long and name it's of type string. 01:59.220 --> 02:04.160 We can add more more parameters, but for now, it's good. 02:04.200 --> 02:06.720 Now let's create its implementation. 02:06.840 --> 02:14.240 Kotlin new class named as marker repository implementation. 02:14.240 --> 02:24.600 This class needs to inject the constructor and as we learned before we need to set the firebase which 02:24.600 --> 02:27.560 is Firebase Firestore parameter. 02:27.560 --> 02:30.440 If you have any question please don't be shy. 02:30.640 --> 02:33.720 Ask me and I'll respond. 02:33.720 --> 02:42.160 Also if you have any doubt you can refer to the previous examples and the previous sections in order 02:42.160 --> 02:44.960 to learn more about dependency injection. 02:44.960 --> 02:50.280 But don't worry I will lecture here in a quick recap. 02:50.400 --> 02:51.640 What we've done here. 02:51.640 --> 02:55.200 We created the marker repository interface. 02:55.240 --> 03:03.540 Marker repository is a Kotlin interface, which is for example, a contract that defines what methods 03:03.580 --> 03:05.620 a class should implement. 03:05.660 --> 03:13.940 The suspend function means this function is a suspending function, so it can be called inside a coroutine. 03:14.260 --> 03:17.820 It takes a marker object Latlong. 03:18.060 --> 03:23.060 Latitude and longitude coordinates and the name which is of type string. 03:23.300 --> 03:26.020 It doesn't return any thing. 03:26.340 --> 03:35.140 The marker repository implementation is a class that implements the marker repository interface. 03:35.140 --> 03:43.100 The inject constructor tells a dependency injection framework, which is in this case the hilt framework. 03:43.140 --> 03:44.940 How to create this class? 03:45.140 --> 03:51.380 It needs a Firebase Firestore instance passed in automatically. 03:51.580 --> 03:53.020 Firebase Firestore. 03:53.100 --> 04:01.380 This is the Firebase Firestore database object from the Firebase SDK used to read or write data in your 04:01.420 --> 04:03.480 Firestore Database. 04:03.480 --> 04:11.200 So the first step is creating this interface to define what your repository does. 04:11.240 --> 04:19.600 The capability to add a marker without carrying how it does it makes your code testable and swappable. 04:19.800 --> 04:27.320 You can later have Firebase marker repository that tries to Firebase uh, also saving a local database 04:27.320 --> 04:29.280 or for testing. 04:29.320 --> 04:29.840 Okay. 04:29.960 --> 04:36.440 So we're going to use it as a marker in order to insert markers into database. 04:36.440 --> 04:41.920 So we use this clean architecture interface defines what you can do. 04:42.160 --> 04:44.920 This interface defines what you can do. 04:45.320 --> 04:51.520 The repository implementation defines how you do it okay. 04:51.720 --> 04:55.760 The interface defines what you can do like adding markers. 04:56.160 --> 05:01.440 The implementation defines how you do it okay. 05:01.480 --> 05:05.940 Here we need to implement the function add marker. 05:05.940 --> 05:11.660 And here we're going to define how we can do it how we can add markers. 05:11.660 --> 05:19.660 So I want from you to understand concepts guys I'm not uh I don't uh want from you to copy and paste 05:19.660 --> 05:21.620 codes or follow me typing. 05:21.620 --> 05:24.580 I want from you to understand concepts. 05:24.580 --> 05:28.100 So here we are defining what you can do. 05:28.340 --> 05:29.220 Add marker. 05:29.220 --> 05:30.300 Remove marker. 05:30.300 --> 05:31.420 Delete database. 05:31.420 --> 05:32.660 Delete markers. 05:33.300 --> 05:34.660 Clean architecture. 05:34.820 --> 05:37.900 Clean the whole map, draw Polylines. 05:38.060 --> 05:43.540 Here inside the implementation we define how we can do it. 05:43.820 --> 05:46.660 So we have this red line. 05:46.660 --> 05:54.140 This arrow we need to implement members which is the add marker inherited from marker repository okay. 05:54.300 --> 05:58.500 In the next video we're going to continue with this add marker. 05:58.500 --> 06:05.380 And we're going to define how we can do the add marker function.