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samples/experimental/pedometer/README.md

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# FFIgen + JNIgen pedometer
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.
- [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
**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.
## 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.
### 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).
`dart run ffigen --config ffigen.yaml`
### JNIgen
Configuration for JNIgen is [here](/jnigen.yaml) for the [HealthConnect API](https://developer.android.com/guide/health-and-fitness/health-connect).
1. `cd Example && flutter build apk`
2. `cd .. && dart run jnigen --config jnigen.yaml`
## 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.
Note that step counting is only available on physical devices.
### iOS
- `flutter run`
- Allow *pedometer* app access to step counting
### 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
## Project stucture
* `src`: Contains the native source code, and a CMakeLists.txt file for building
that source code into a dynamic library.
* `lib`: Contains the Dart code that defines the API of the plugin, and which
calls into the native code using `dart:ffi`.
* platform folders (`ios` etc.): Contains the build files
for building and bundling the native code library with the platform application.
* `example`: Contains the native source code for building
that source code into a dynamic library.