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[![official project](http://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub) [![official project](http://jb.gg/badges/official.svg)](https://confluence.jetbrains.com/display/ALL/JetBrains+on+GitHub)
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# [Compose Multiplatform](https://github.com/JetBrains/compose-multiplatform) Mobile Application # Compose Multiplatform mobile application
Use this template to start developing your own Compose Multiplatform application targeting Android and iOS (Alpha). > Compose Multiplatform is in Alpha. It may change incompatibly and require manual migration in the future.
You can use this template to start developing your own [Compose Multiplatform](https://github.com/JetBrains/compose-multiplatform) application.
The result will be a Kotlin Multiplatform project targeting Android and iOS.
![](readme_images/banner.png) ![](readme_images/banner.png)
## Setting up your development environment ## Set up an environment
Your Compose Multiplatform application targeting Android and iOS is a Kotlin Multiplatform project. > **Important**. You will need a Mac with macOS to write and run iOS-specific code on simulated or real devices.
Let's make sure you have set up your environment for mobile development with Kotlin Multiplatform. > This is an Apple requirement.
> **Warning** To work with this template, you need the following:
> Writing and running iOS-specific code for a simulated or real device requires macOS. This is an Apple limitation.
To work with this template, you will need: * A machine running a recent version of macOS
- A machine running a recent version of macOS * [Xcode](https://apps.apple.com/us/app/xcode/id497799835)
- [Xcode](https://developer.apple.com/xcode/) * [Android Studio](https://developer.android.com/studio)
- [Android Studio](https://developer.android.com/studio) * [Kotlin Multiplatform Mobile plugin](https://plugins.jetbrains.com/plugin/14936-kotlin-multiplatform-mobile)
- [Kotlin Multiplatform Mobile plugin](https://plugins.jetbrains.com/plugin/14936-kotlin-multiplatform-mobile) * [CocoaPods dependency manager](https://kotlinlang.org/docs/native-cocoapods.html)
- [CocoaPods](https://kotlinlang.org/docs/native-cocoapods.html)
### Checking your development environment with `kdoctor` ### Check your environment
**Before opening the project in Android Studio**, use [`kdoctor`](https://github.com/Kotlin/kdoctor) to ensure your development environment is configured correctly. Install `kdoctor` via [`brew`](https://brew.sh/): Before you start, use the [KDoctor](https://github.com/Kotlin/kdoctor) tool to ensure you have all the tools and that your development environment is configured correctly.
```
brew install kdoctor
```
Then, run `kdoctor` from your terminal. If everything is set up correctly, you should see valid output. Otherwise, `kdoctor` will provide you which parts of your setup still need configuration: 1. Install KDoctor with [Homebrew](https://brew.sh/):
``` ```text
brew install kdoctor
```
2. Run KDoctor in your terminal:
```text
kdoctor
```
If everything is set up correctly, you'll see a valid output:
```text
Environment diagnose (to see all details, use -v option): Environment diagnose (to see all details, use -v option):
[✓] Operation System [✓] Operation System
[✓] Java [✓] Java
@ -42,83 +52,104 @@ Conclusion:
✓ Your system is ready for Kotlin Multiplatform Mobile Development! ✓ Your system is ready for Kotlin Multiplatform Mobile Development!
``` ```
## Opening the project Otherwise, KDoctor will highlight which parts of your setup still need configuration and suggest how to fix them.
Use Android Studio to open the project. Make sure you have the [Kotlin Multiplatform Mobile plugin](https://plugins.jetbrains.com/plugin/14936-kotlin-multiplatform-mobile) installed.
## Examining the project structure ## Examine the project structure
Switch to the Project View to see all files and targets belonging to the project. 1. Open the project in Android Studio.
2. Switch the project view from **Android** to **Project** to see all the files and targets belonging to the project.
<img src="readme_images/open_project_view.png" height="300px"> <img src="readme_images/open_project_view.png" height="300px">
Your Compose Multiplatform project includes three modules: Your Compose Multiplatform project includes three modules:
### `shared` ### shared
This Kotlin module that contains the logic common for both Android and iOS applications – the code you share between platforms.
**This is also where you will write your Compose Multiplatform code**. This is a Kotlin module that contains the logic common for both Android and iOS applications, the code you share between platforms.
The shared root `@Composable` function for your app lives in `shared/src/commonMain/kotlin/App.kt`. This `shared` module is also where you write your Compose Multiplatform code.
You can find the shared root `@Composable` function for your app in `shared/src/commonMain/kotlin/App.kt`.
`shared` 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. 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` ### androidApp
This 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. 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` ### iosApp
This is the Xcode project that builds into an iOS application. It depends on and uses the shared module as a CocoaPods dependency.
## Running your application This is an Xcode project that builds into an iOS application.
It depends on and uses the shared module as a CocoaPods dependency.
## Run your application
### On Android
## Android
To run your application on an Android emulator: To run your application on an Android emulator:
- Create an [Android virtual device](https://developer.android.com/studio/run/managing-avds#createavd). 1. Create an [Android virtual device](https://developer.android.com/studio/run/managing-avds#createavd).
- Select the `androidApp` run configuration. 2. In the list of run configurations, select `androidApp`.
- Select your target device and press **Run**. 3. Choose your virtual device and click **Run**.
<img src="readme_images/run_on_android.png" height="60px"> <img src="readme_images/run_on_android.png" height="60px">
<img src="readme_images/android_app_running.png" height="200px"> <img src="readme_images/android_app_running.png" height="200px">
<details> <details>
<summary>Using Gradle</summary> <summary>Alternatively, use Gradle</summary>
`./gradlew installDebug` - install Android application on an Android device (on a real device or on an emulator) To install an Android application on a real device Android device or an emulator, run `./gradlew installDebug` in the terminal.
</details> </details>
## iOS ### On iOS
We suggest going through the "Hello, World" steps of creating and deploying a sample project in Xcode to a simulator and/or your physical device. #### Running on an iOS simulator
A video tutorial for setting up Xcode and running your first "Hello, World" application is available in [this Standford CS193P lecture recording](https://youtu.be/bqu6BquVi2M?start=716&end=1399).
### Running on an iOS simulator Once you have configured your environment correctly,
you can select which iOS simulator to run your application in Android Studio by modifying the `iosApp` run configuration.
Once you have configured your environment correctly, you will be able to select which iOS simulator to run your application in Android Studio on by modifying the `iosApp` run configuration. In the list of run configurations, select **Edit Configurations** and navigate to **iOS Application** | **iosApp**.
In the **Execution target** list, select your target device.
Select "Run" | "Edit Configurations..." and navigate to the "iOS Application" | "iosApp" run configuration. In the "Execution target" drop-down, select your target device.
<img src="readme_images/edit_run_config.png" height="200px"> <img src="readme_images/edit_run_config.png" height="200px">
<img src="readme_images/target_device.png"> <img src="readme_images/target_device.png">
Press the "Run" button to run your Compose Multiplatform app on the iOS simulator. Press the **Run** button to run your Compose Multiplatform app on the iOS simulator.
<img src="readme_images/hello_world_ios.png" height="200px"> <img src="readme_images/hello_world_ios.png" height="200px">
### Running on a real iOS device #### Running on a real iOS device
Running your Compose Multiplatform application on a physical device can be done for free. You need: You can run your Compose Multiplatform application on a real device. To do that, you'll need the following:
- an [Apple ID](https://support.apple.com/en-us/HT204316)
- the registered iOS device in Xcode
Before you continue, make sure that you can successfully run a plain "Hello, World" application from Xcode on your physical device. * `TEAM_ID` associated with your [Apple ID](https://support.apple.com/en-us/HT204316)
* The iOS device registered in Xcode
To run the application, set the `TEAM_ID` associated with your Apple ID in `iosApp/Configuration/Config.xcconfig`. 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 [this Standford CS193P lecture recording](https://youtu.be/bqu6BquVi2M?start=716&end=1399).
#### Finding your Team ID <details>
Use `kdoctor --team-ids` to find and set your Team ID. This will list all Team IDs currently configured on your system, for example:
``` <summary>How to create and run a simple project in Xcode</summary>
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 a device name near the **Run** button.
6. Plug in your device to the computer. You'll see this device in the list of run options.
7. Choose your device and click **Run**.
</details>
##### Finding your Team ID
In the terminal, run `kdoctor --team-ids` to find your Team ID.
KDoctor will list all Team IDs currently configured on your system, for example:
```text
3ABC246XYZ (Max Sample) 3ABC246XYZ (Max Sample)
ZABCW6SXYZ (SampleTech Inc.) ZABCW6SXYZ (SampleTech Inc.)
``` ```
@ -126,23 +157,31 @@ ZABCW6SXYZ (SampleTech Inc.)
<details> <details>
<summary>Alternative way of finding your Team ID</summary> <summary>Alternative way of finding your Team ID</summary>
If you're running into trouble with the method described above, you can try this alternative method. If KDoctor doesn't work for you, try this alternative method:
- Run the `iosApp` run configuration from Android Studio (it will fail)
- Open the `iosApp/iosApp.xcworkspace` in Xcode 1. In Android Studio, run the `iosApp` configuration with the selected real device. The build should fail.
- Select `iosApp` in the menu on the left side 2. Go to Xcode and select **Open a project or file**.
- Navigate to "Signing & Capabilities" 3. Navigate to the `iosApp/iosApp.xcworkspace` file of your project.
- Select your Personal Team in the "Team" dropdown. If you haven't set up your team, use the "Add account..." option and follow the steps inside Xcode. 4. In the left menu, select `iosApp`.
5. Navigate to **Signing & Capabilities**.
6. In the **Team** list, select your personal team.
If you haven't set up your team yet, use the **Add account** option and follow the steps.
</details> </details>
Set this Team ID in `iosApp/Configuration/Config.xcconfig` in the `TEAM_ID` field. To run the application, set the `TEAM_ID` associated with your Apple ID:
After that you can re-open the project in Android Studio, and it will show the registered iOS device in the `iosApp` 1. In the template, navigate to the `iosApp/Configuration/Config.xcconfig` file.
run configuration. 2. Set your `TEAM_ID`.
3. Re-open the project in Android Studio. It should show the registered iOS device in the `iosApp` run configuration.
## Make your first changes
### Make your first changes In Android Studio, navigate to the `shared/src/commonMain/kotlin/App.kt` file.
It's the common entry point for your Compose Multiplatform app.
Here, you see the code responsible for rendering the "Hello, World!" button and the animated Compose Multiplatform logo:
The common entry point for your Compose Multiplatform app is located in `shared/src/commonMain/kotlin/App.kt`. Here, you will see the code that is responsible for rendering the "Hello, World" button and the animated Compose Multplatform logo. If you make changes here, you will see them reflected on both Android and iOS:
```kotlin ```kotlin
@OptIn(ExperimentalResourceApi::class) @OptIn(ExperimentalResourceApi::class)
@Composable @Composable
@ -196,21 +235,27 @@ internal fun App() {
} }
``` ```
You'll see this change reflected on both the Android and iOS apps:
<img src="readme_images/text_field_added.png" height="200px"> <img src="readme_images/text_field_added.png" height="200px">
### Configuring the iOS application ## How to configure the iOS application
This template contains a `iosApp/Configuration/Config.xcconfig` configuration file that allows you to configure most basic properties without having to move to Xcode. It contains: You can further configure the basic properties of your iOS app using this template without opening Xcode.
- `APP_NAME` - target executable and application bundle name In Android Studio, navigate to the `iosApp/Configuration/Config.xcconfig` configuration file. It contains:
- `BUNDLE_ID` - [bundle identifier](https://developer.apple.com/documentation/bundleresources/information_property_list/cfbundleidentifier#discussion)
- `TEAM_ID` - [Team ID](https://developer.apple.com/help/account/manage-your-team/locate-your-team-id/#:~:text=A%20Team%20ID%20is%20a,developer%20in%20App%20Store%20Connect.)
Note: To configure the `APP_NAME` setting, open `Config.xcconfig` in any text editor *before opening* the project in Android Studio, and set the desired name. * `APP_NAME`, a target executable and an application bundle name
* `BUNDLE_ID` that [uniquely identifies the app throughout the system](https://developer.apple.com/documentation/bundleresources/information_property_list/cfbundleidentifier#discussion)
* `TEAM_ID`, [a unique identifier generated by Apple that's assigned to your team](https://developer.apple.com/help/account/manage-your-team/locate-your-team-id/#:~:text=A%20Team%20ID%20is%20a,developer%20in%20App%20Store%20Connect)
If you need to change this setting after you open the project in Android Studio, please do the following: To configure the `APP_NAME` option, open `Config.xcconfig` in any text editor *before opening* the project in Android Studio, and set the desired name.
- close the project in Android Studio
- run `./cleanup.sh` in your terminal
- change the setting
- open the project in Android Studio again
For configuring advanced settings, you can use Xcode. Open the `iosApp/iosApp.xcworkspace` in Xcode after opening the project in Android Studio, and use Xcode to make your changes. If you need to change this option after you open the project in Android Studio, do the following:
1. Close the project in Android Studio.
2. Run `./cleanup.sh` in your terminal.
3. Change the setting.
4. Open the project in Android Studio again.
To configure advanced settings, use Xcode. After opening the project in Android Studio,
go to Xcode and open the `iosApp/iosApp.xcworkspace` file, and make changes.