文件列表:

app/
gradle/wrapper/
build.gradle
gradle.properties
gradlew
gradlew.bat
settings.gradle

# MVVM Architecture Android: Sample App (Hilt) This repository contains a sample app that implements MVVM architecture using Kotlin, Hilt, Retrofit, Coroutines, Flow, Stateflow, Room, etc. ## Major Highlights - MVVM Architecture - Kotlin - Hilt - Retrofit - Coroutines - Flows - Stateflow - View binding - Unit Test - Offline Support ## Dagger2 and Dagger Hilt Main Differences ## [Dagger2](https://github.com/pavanmankar/newsTrending) - It is a fully-featured, compile-time dependency injection framework. - Configuration: Requires a lot of boilerplate code and manual configuration. - Learning Curve: Steeper learning curve due to its comprehensive feature set. - Flexibility: Offers a high level of flexibility and customization. - Use Cases: Suitable for complex. - There are annotations defined in Dagger 2 to specify which operation to take. We will now briefly touch on these. - [Dagger Project Link](https://github.com/pavanmankar/newsTrending) ## @Provides The classes to be used are specified here. Dagger finds and retrieves the desired injection by looking at the @Provide methods. ## @Inject It is used to tell Dagger what all dependencies are that need to be passed. We can use @Inject in 3 different places. Constructors Objects Methods ## @Module Classes in which @Provide annotations are used are told to Dagger with the @Module annotation. ## @Component It’s something like a bridge between @Module and @Inject. It is used to create interfaces that connect everything. Here we define from which modules we get our dependencies. ## @Scope It determines the life processes. ## Hilt - Type:Hilt is a library built on top of Dagger 2, designed to simplify dependency injection in Android applications. - Configuration: Offers simplified annotations and reduced boilerplate code compared to Dagger 2. - Learning Curve: Easier to learn and use, especially for developers new to Dagger. - Flexibility: Sacrifices some flexibility for ease of use and reduced setup. - Use Cases: Aimed at Android app developers for more straightforward dependency injection. - Annotations such as module, inject and provides are also used in Hilt. We will now briefly touch on these. ## @HiltAndroidApp Generates the Hilt code. It should be added to the Application class. ## @AndroidEntryPoint Thanks to this annotation, many components such as Activity, Fragment, View become ready to be @Inject. ## @HiltViewModel Used for classes that derive from ViewModel. For Retrofit client or database operations, when we create and @Inject objects as modules, Hilt finds those objects from within the modules and presents them to us. ## @InstallIn This indicates that Hilt-created DI containers must be present in module bindings. We specify the scope we will use. #### The app contains the following packages: 1. **data**: It contains all the data accessing and manipulating components. 2. **di**: Dependency providing classes using Dagger2. 3. **ui**: View classes along with their corresponding ViewModel. 4. **utils**: Utility classes. # Application Architecture   The main advantage of using MVVM, there is no two-way dependency between ViewModel and Model, unlike MVP. Here the view can observe the data changes in the ViewModel as we are using LiveData which is lifecycle aware. The viewmodel-to-view communication is achieved through observer pattern (basically observing the state changes of the data in the viewmodel). ## Features Implemented - Fetching News - Top Headlines News - News Based on Source - News Based on Selection - News Based on Language Selection - Instant Search using Flows Operator * Debounce * Filter * DistinctUntilChanged * FlatMapLatest * Map - Unit Test - Mockito - JUnit - [Turbine](https://github.com/cashapp/turbine/) ### License ``` Copyright (C) 2024 Pavan Mankar Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0

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