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# FFIgen + JNIgen pedometer | ||
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This is a demo for some of our tooling around calling platform APIs directly from dart code. This repository represents a demo of a plugin that leverages FFIgen & JNIgen. There is also an example pedometer app that uses the bindings generated from these tools. | ||
This is a demo for some of our tooling around | ||
calling platform APIs directly from dart code. | ||
This repository represents a demo of a plugin that leverages FFIgen & JNIgen. | ||
There is also an example pedometer app that | ||
uses the bindings generated from these tools. | ||
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- [FFIgen](https://pub.dev/packages/ffigen) is used to generate bindings for C, Objective-C and Swift APIs | ||
- [JNIgen](https://pub.dev/packages/jnigen) is used to generate bindings for Java and Kotlin APIs | ||
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**These tools are both experimental and are currently a work in progress.** If you find any issues or have feedback, please file it on the corresponding Github repositories. | ||
- [FFIgen](https://pub.dev/packages/ffigen) is used to generate | ||
bindings for C, Objective-C and Swift APIs. | ||
- [JNIgen](https://pub.dev/packages/jnigen) is used to generate | ||
bindings for Java and Kotlin APIs. | ||
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**These tools are both experimental and are currently a work in progress.** | ||
If you find any issues or have feedback, | ||
please file it on the corresponding GitHub repositories. | ||
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## Re-generating bindings | ||
The bindings that allow the dart code to call the platform code have already been generated [here](/lib). You can regenerate them by following the steps below. | ||
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The bindings that allow the Dart code to call the platform code have | ||
already been generated in the [`\lib` folder](./lib). | ||
You can regenerate them by following the steps below: | ||
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### FFIgen | ||
Configuration for FFIgen is [here](/ffigen.yaml) for the [CoreMotion](https://developer.apple.com/documentation/coremotion) framework. FFIgen currently does not support autogenerating the code to handle callbacks. So, there were a few steps needed to appropriately handle callbacks in Objective-C. You can [read more here](https://dart.dev/guides/libraries/objective-c-interop#callbacks-and-multithreading-limitations). | ||
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`dart run ffigen --config ffigen.yaml` | ||
Configuration of FFIgen for the | ||
[CoreMotion framework](https://developer.apple.com/documentation/coremotion) | ||
is in the [`ffigen.yaml` file](./ffigen.yaml). | ||
FFIgen currently does not support autogenerating code to handle callbacks. | ||
So, there are a few extra steps needed to | ||
appropriately handle callbacks in Objective-C. | ||
You can read more about this limitation on | ||
[dart.dev]((https://dart.dev/guides/libraries/objective-c-interop#callbacks-and-multithreading-limitations). | ||
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```bash | ||
dart run ffigen --config ffigen.yaml | ||
``` | ||
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### JNIgen | ||
Configuration for JNIgen is [here](/jnigen.yaml) for the [HealthConnect API](https://developer.android.com/guide/health-and-fitness/health-connect). | ||
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1. `cd Example && flutter build apk` | ||
2. `cd .. && dart run jnigen --config jnigen.yaml` | ||
Configuration of JNIgen for the | ||
[HealthConnect API](https://developer.android.com/guide/health-and-fitness/health-connect) | ||
is in the [`jnigen.yaml` file](./jnigen.yaml). | ||
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1. Build an Android APK file from the example app. | ||
Currently, JNIgen requires at least one APK build | ||
to obtain the classpaths of Android Gradle libraries. | ||
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```bash | ||
cd example && flutter build apk | ||
``` | ||
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2. Return to the `/pedometer` directory and run `jnigen`: | ||
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```bash | ||
cd .. && dart run jnigen --config jnigen.yaml | ||
``` | ||
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## Running the example app | ||
The example app is located in the `experimental/pedometer/example` directory, | ||
and the commands below assume they are being run from that location. | ||
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The example app is located in the [`/example`](./example) directory, | ||
and the following commands assume they are being run from that location. | ||
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Note that step counting is only available on physical devices. | ||
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### iOS | ||
- `flutter run` | ||
- Allow *pedometer* app access to step counting | ||
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- Run `flutter run` and choose your physical device. | ||
- Allow the *pedometer* app access to step counting. | ||
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### Android | ||
- Make sure that Google Fit is installed (to ensure that steps are being counted) | ||
- `flutter run` | ||
- Install Health Connect and grant access to Google Fit and the *jni_demo* app | ||
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- Make sure that [Google Fit](https://play.google.com/store/apps/details?id=com.google.android.apps.fitness) | ||
is installed (to ensure that steps are being counted). | ||
- Run `flutter run` and choose your physical device. | ||
- Install [Health Connect](https://play.google.com/store/apps/details?id=com.google.android.apps.healthdata) | ||
and grant access to Google Fit and the *jni_demo* app. | ||
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## Project stucture | ||
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* `src`: Contains the native source code, and a CMakeLists.txt file for building | ||
that source code into a dynamic library. | ||
## Project structure | ||
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* `src`: Contains the native source code, and a `CMakeLists.txt` file for | ||
building that source code into a dynamic library. | ||
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* `lib`: Contains the Dart code that defines the API of the plugin, and which | ||
* `lib`: Contains the Dart code that defines the API of the plugin and | ||
calls into the native code using `dart:ffi`. | ||
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* platform folders (`ios` etc.): Contains the build files | ||
for building and bundling the native code library with the platform application. | ||
* platform folders (`ios` etc.): Contain the build files for | ||
building and bundling the native code library with the platform application. | ||
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* `example`: Contains the native source code for building | ||
that source code into a dynamic library. |
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