[pedometer] Fix file/folder links and cleanup instructions (#1988)

- Fixes links to specific files/folders
- Adds more file links where relevant
- Uses more specific link text than "here"
- Add links to relevant apps when mentioned
- Slightly expands on some instructions
- Cleans up formatting

Fixes #1978

experimental/pedometer/README.md

@@ -1,54 +1,93 @@
 # 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. 
+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. 
+- [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. 
+
+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:
 
 ### 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`
+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).
+
+```bash
+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`
+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).
+
+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.
+
+   ```bash
+   cd example && flutter build apk
+   ```
 
+2. Return to the `/pedometer` directory and run `jnigen`:
+
+   ```bash
+   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.
+
+The example app is located in the [`/example`](./example) directory,
+and the following commands 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
+
+- Run `flutter run` and choose your physical device.
+- Allow the *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
 
+- 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.
 
-## Project stucture
 
-* `src`: Contains the native source code, and a CMakeLists.txt file for building
-  that source code into a dynamic library.
+## Project structure
+
+* `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
+* `lib`: Contains the Dart code that defines the API of the plugin and
   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.
+* platform folders (`ios` etc.): Contain 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.

experimental/pedometer/example/README.md

@@ -2,15 +2,4 @@
 
 Demonstrates how to use the pedometer plugin.
 
-## Getting Started
-
-This project is a starting point for a Flutter application.
-
-A few resources to get you started if this is your first Flutter project:
-
-- [Lab: Write your first Flutter app](https://docs.flutter.dev/get-started/codelab)
-- [Cookbook: Useful Flutter samples](https://docs.flutter.dev/cookbook)
-
-For help getting started with Flutter development, view the
-[online documentation](https://docs.flutter.dev/), which offers tutorials,
-samples, guidance on mobile development, and a full API reference.
+Visit the primary [pedometer README](../README.md) for more information.