MoviesKMM

Jetpack Compose and SwiftUI-based Kotlin Multiplatform sample project (based on TMDB API).

Tech stack

Purpose	Tool used	Purpose	Tool used
Framework	Kotlin Multiplatform	Database	SQLDelight
Android UI	Jetpack Compose	Encryption	SQLCipher
iOS UI	SwiftUI	Serialization	Kotlinx Serialization
Lifecycle	KMM-ViewModel	BuildConfig	BuildKonfig
Multi-threading	KMP-NativeCoroutines	Logging	Napier
DI	Koin	Lint Check	Detekt
Networking	Ktor	Image Loading	Coroutine Image Loader
Testing (Common)	Mockative	Testing (HTTP)	Ktor Mock
Testing (Android Unit)	Mockk	Testing (Android Instrumented)	AndroidJUnit4

In this project, KMP-NativeCoroutines is used, to work with flows in iOS. It is an open-source solution that supports cancellation and generics with flows, which the Kotlin/Native compiler doesn't yet provide by default. It helps to consume suspending functions and flows from iOS. It directly supports the async/await, Combine, and RxSwift approaches to concurrency. KMP-NativeCoroutines has built-in support for KMM-ViewModel, also used in this project to create a common ViewModel. Coroutines inside your KMMViewModel will (by default) use the CoroutineScope from the ViewModelScope.

SQLCipher is a standalone fork of the SQLite database library that adds 256 bit AES encryption of database files.

Known Issues

There is currently a CI failure for IOS build due to SQLCipher which has been reported here: sqlcipher/sqlcipher#502. The build is otherwise working fine locally.

CI/CD Flow (Github Actions)

flowchart LR
    A[Push to 'main'] -->|Commit| Z{Trigger keyword found?}
    Z --> |Yes|B[Trigger Workflows]
    B --> D[Run Common Tests - KMP Android & KMP iOS]
    B --> E[Run Android Tests - Unit & Instrumented]
    B --> F[Run iOS Tests - Simulator]
    B --> G[Generate Android Build]
    B --> H[Generate iOS Build]
    E --> I[Upload & Publish Test Reports]
    D --> J[Upload Test Reports]
    F --> K[End]
    G --> K[End]
    H --> K[End]
    I --> K[End]
    J --> K[End]

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Testing (common)

Section	Status
Database DAO	Done ✅
Network Source	Done ✅
Repository	Done ✅
Database Fetch UseCase	Done ✅

Testing (Android - Unit)

Section	Status
Check Encryption Passphrase UseCase	Done ✅
Enable Encryption UseCase	Done ✅

Testing (Android - Instrumented)

Section	Status
SQLDelight Cipher Encryption	Done ✅
Check Encryption Passphrase UseCase	Done ✅
Enable Encryption UseCase	Done ✅

Architecture

The codebase completely follows Uncle Bob's style!

Reference and Inspiration

The project has referred to multiple blogs and open-source resources for learning purpose. The most important are:

1. BikeShare by John O'Reilly - Good use of KMMViewModel along with Native Coroutines.
2. HarvestTimeKMP by the amazing team at Mutual Mobile: Anmol Verma, Shubham Singh, Yugesh Jain & others - A good Clean Architecture with KMM project.
3. NoteDelight by Artur Babichev - Amazing use of Database encryption with Cipher.
4. KaMPKitSQLCipher by the Touch Lab.
5. Multiplatform Encryption with SQLDelight and SQLCipher by Sam Hill
6. SQLCipher and KMM by Kevin Galligan

Check your environment

Before you start, use the KDoctor tool to ensure that your development environment is configured correctly:

1. Install KDoctor with Homebrew: brew install kdoctor

2. Run KDoctor in your terminal: kdoctor

   If everything is set up correctly, you'll see valid output:

   Environment diagnose (to see all details, use -v option):
   [✓] Operation System
   [✓] Java
   [✓] Android Studio
   [✓] Xcode
   [✓] Cocoapods
   
   Conclusion:
     ✓ Your system is ready for Kotlin Multiplatform Mobile development!
   

Otherwise, KDoctor will highlight which parts of your setup still need to be configured and will suggest a way to fix them.

Screens

Home (iOS)	Home (Android)
Details (iOS)	Details (Android)

Understanding the project structure

Open the project in Android Studio and switch the view from Android to Project to see all the files and targets belonging to the project:

Your Kotlin Multiplatform project includes 3 modules:

shared

This is a Kotlin module that contains the logic common for both Android and iOS applications, that is, the code you share between platforms.

This shared module is also where you’ll write your Kotlin Multiplatform code. In shared/src/commonMain/kotlin/App.kt, you can find the shared root @Composable function for your app.

It uses Gradle as the build system. You can add dependencies and change settings in shared/build.gradle.kts. The shared module builds into an Android library and an iOS framework.

androidApp

This is a Kotlin module that builds into an Android application. It uses Gradle as the build system. The androidApp module depends on and uses the shared module as a regular Android library.

iosApp

This is an Xcode project that builds into an iOS application. It depends on and uses the shared module as a CocoaPods dependency.

How to get started

In local.properties file:

1. Generate the API key from The Movie Database API, place the key as api_read_access_token=<YOUR_API_KEY_HERE>.
2. Create a unique passphrase for SQLCipher encryption and add as db_encryption_pass=<YOUR_API_KEY_HERE>.

If you are forking the project and want the build through Github Actions, add the above keys as secrets.

Run your application

On Android

To run your application on an Android emulator:

1. Ensure you have an Android virtual device available. Otherwise, create one.

2. In the list of run configurations, select androidApp.

3. Choose your virtual device and click Run:

   

Alternatively, use Gradle

To install an Android application on a real Android device or an emulator, run ./gradlew installDebug in the terminal.

On iOS

Running on a simulator

To run your application on an iOS simulator in Android Studio, modify the iosApp run configuration:

1. In the list of run configurations, select Edit Configurations:

   

2. Navigate to iOS Application | iosApp.

3. In the Execution target list, select your target device. Click OK.

4. The iosApp run configuration is now available. Click Run next to your virtual device.

Running on a real device

You can run your Kotlin Multiplatform application on a real iOS device for free. To do so, you'll need the following:

• The TEAM_ID associated with your Apple ID
• The iOS device registered in Xcode

Note Before you continue, we suggest creating a simple "Hello, world!" project in Xcode to ensure you can successfully run apps on your device. You can follow the instructions below or watch this Stanford CS193P lecture recording.

How to create and run a simple project in Xcode

1. On the Xcode welcome screen, select Create a new project in Xcode.
2. On the iOS tab, choose the App template. Click Next.
3. Specify the product name and keep other settings default. Click Next.
4. Select where to store the project on your computer and click Create. You'll see an app that displays "Hello, world!" on the device screen.
5. At the top of your Xcode screen, click on the device name near the Run button.
6. Plug your device into the computer. You'll see this device in the list of run options.
7. Choose your device and click Run.

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License

MIT License

Copyright (c) 2024 Pushpal Roy

Permission is hereby granted, free of charge, to any person obtaining a 
copy of this software and associated documentation files (the "Software"), 
to deal in the Software without restriction, including without limitation 
the rights to use, copy, modify, merge, publish, distribute, sublicense, 
and/or sell copies of the Software, and to permit persons to whom the 
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included 
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.