WEBVTT 00:00.080 --> 00:03.360 We created the ViewModel and the repository. 00:03.360 --> 00:11.560 Since we are using hilt for dependency injection, we need to create a module to tell hilt how to create 00:11.560 --> 00:14.960 and provide dependencies to the rest of your app. 00:15.160 --> 00:22.320 Please refer back to the previous sections and dependency injection sections, and especially dealing 00:22.320 --> 00:30.480 with third party libraries like Firebase Retrofit and uh, and others in order to learn how to create 00:30.480 --> 00:31.080 modules. 00:31.080 --> 00:32.640 Why we use modules. 00:32.640 --> 00:36.840 But don't worry I'll I'm going to clarify everything. 00:36.840 --> 00:39.560 So please pay attention with me. 00:39.560 --> 00:46.400 Since we are dealing with third party libraries like Firebase, we need to create modules to tell hilt 00:46.440 --> 00:50.440 how to create and provide dependencies to the rest of your app. 00:50.680 --> 00:57.920 Inside this package, create a new package named as die deferring for dependency injection. 00:57.960 --> 01:00.440 New Kotlin object. 01:00.480 --> 01:03.800 Name it as Firebase module. 01:03.840 --> 01:09.770 Annotate it with module annotation and install in. 01:09.810 --> 01:14.530 Set the singleton component class Alt+. 01:14.530 --> 01:21.650 Enter singleton, not single component, singleton component and imported module. 01:21.690 --> 01:31.930 This object contains methods that provide dependencies, so the Firebase module contains methods that 01:31.930 --> 01:33.650 provide dependencies. 01:33.850 --> 01:36.170 Install in annotation. 01:36.530 --> 01:40.730 This says where these dependencies live. 01:40.970 --> 01:48.730 Singleton component means these dependencies exist for the lifetime of your application. 01:49.010 --> 01:50.530 They are singletons. 01:50.770 --> 01:57.210 One shared instance of your whole application the Firebase module. 01:57.330 --> 01:59.370 This is the Kotlin object. 01:59.370 --> 02:01.450 It's a singleton itself. 02:01.450 --> 02:04.930 No need to instantiate Firebase module. 02:04.930 --> 02:10.690 Now we need to create the functions that this object provide. 02:10.730 --> 02:14.770 We have the Firebase and the repository. 02:15.050 --> 02:18.530 So let's start with Firebase Firestore. 02:18.570 --> 02:24.810 Function provide Firebase Firestore and return Firebase Firestore. 02:24.850 --> 02:26.490 Get instance Alt+. 02:26.490 --> 02:27.850 Enter to import it. 02:28.010 --> 02:34.010 And by the way thanks for the AI code completion and Gemini. 02:34.210 --> 02:37.370 Okay this is a tool in Android Studio. 02:37.530 --> 02:49.410 Then we need to add a new function called Provide Marker Repository Firestore and returns a marker repository 02:49.530 --> 02:56.650 equals to marker repository implementation and pass via store. 02:56.810 --> 02:59.730 In this object we created two functions. 02:59.730 --> 03:02.730 The first function provide Firebase Firestore. 03:03.050 --> 03:11.090 Returning type Firebase Firestore and it it calls Firebase Firestore dot get instance. 03:11.130 --> 03:16.490 This this is the standard Firebase SDK way to get the singleton. 03:16.650 --> 03:26.500 And here we provide marker repository Passing a parameter of type Firestore returning marker repository 03:26.700 --> 03:32.220 and this equals to the marker repository and pass the firestore instance to it. 03:32.220 --> 03:40.420 So I am calling this instance of marker repository and marker repository implementation and passing 03:40.660 --> 03:44.100 the Firebase instance to it okay. 03:44.140 --> 03:52.900 So those are the two functions we need to provide in order to tell hilt how to create and how to provide 03:52.900 --> 03:53.460 them. 03:53.460 --> 03:58.460 We need to annotate them with two annotations. 03:58.660 --> 04:01.620 The first one is called provides. 04:01.820 --> 04:10.100 And by the way I talked about provides annotation and singleton annotation a lot in the previous videos. 04:10.100 --> 04:16.140 So please go back to learn more about singletons and provides provides. 04:16.140 --> 04:22.780 This function tells hilt how to create Firebase Firestore. 04:22.940 --> 04:29.230 Singleton annotation health will create one instance for the whole app. 04:29.630 --> 04:31.190 The function body. 04:31.310 --> 04:32.190 Return. 04:32.230 --> 04:32.870 Firebase. 04:32.870 --> 04:33.430 Firestore. 04:33.630 --> 04:38.110 Get instance the standard Firebase SDK way to get the singleton. 04:38.110 --> 04:45.310 So anywhere you ask for Firebase Firestore hilt gives you this instance. 04:45.510 --> 04:55.070 Again guys anywhere you ask for Firebase Firestore instance hilt will provide you with this instance 04:55.270 --> 04:55.830 okay. 04:56.070 --> 04:58.590 This is the concept behind it. 04:58.630 --> 05:06.750 Now let's create those two uh those two annotations in function. 05:06.990 --> 05:09.790 And the function provide marker repository. 05:10.030 --> 05:15.750 So provides and singleton again guys provides annotation. 05:15.790 --> 05:20.310 This function tells hilt how to create a marker repository. 05:20.470 --> 05:25.630 Firebase Firestore function and parameter. 05:25.830 --> 05:29.830 Hilt sees that this parameter is needed. 05:30.070 --> 05:39.190 It automatically calls provide firebase store function to get it equals to marker repository implementation 05:39.190 --> 05:46.190 creates a new instance of your repository implementation passing Firestore into the constructor. 05:46.190 --> 05:47.910 Singleton annotation. 05:47.950 --> 05:55.310 Again, only one marker repository implementation exists in the app. 05:55.310 --> 06:01.670 So anywhere you inject marker repository hilt uses this function to build it. 06:01.710 --> 06:02.270 Okay. 06:02.630 --> 06:11.190 So to get Firebase Firestore use Firebase Firestore dot get instance to get marker repository. 06:11.350 --> 06:15.870 Build marker repository implementation with the Firestore instance. 06:16.070 --> 06:25.430 Hill takes care of the order of creation the scooping singleton lifetime and passing dependencies automatically.