restructured the add to app samples (#698)

add_to_app/README.md

@@ -1,51 +1,33 @@
 # Add-to-App Samples
 
-This directory contains a bunch of Android and iOS projects (beginning
-`android_` and `ios_`, respectively) that import and use one of several Flutter
-modules (which have names beginning with `flutter_`). They're designed to show
-recommended approaches for adding Flutter to existing Android and iOS apps.
+This directory contains Android and iOS projects that import and use a Flutter
+module. They're designed to show recommended approaches for adding Flutter to
+existing Android and iOS apps.
+
+## Samples Listing
+
+* [`fullscreen`](./fullscreen) — Embeds a full screen instance of
+  Flutter into an existing iOS or Android app.
+* [`prebuild_module`](./prebuilt_module) — Embeds a full screen
+  instance of Flutter as a prebuilt library that can be loaded into an existing
+  iOS or Android app.
+* [`plugin`](./plugin) — Embeds a full screen Flutter instance that
+  is using plugins into an existing iOS or Android app.
+* [`books`](./books) — Mimics a real world use-case of embedding Flutter into an
+  existing Android app and demonstrates using
+  [Pigeon](https://pub.dev/packages/pigeon) to communicate between Fluter and
+  the host application.
 
 ## Goals for these samples
 
 * Show developers how to add Flutter to their existing applications.
 * Show the following options:
-  - Whether to build the Flutter module from source each time the app builds or
+  * Whether to build the Flutter module from source each time the app builds or
     rely on a separately pre-built module.
-  - Whether plugins are needed by the Flutter module used in the app.
+  * Whether plugins are needed by the Flutter module used in the app.
 * Show Flutter being integrated ergonomically with applications with existing
   middleware and business logic data classes.
 
-## tl;dr
-
-If you're just looking to get up and running quickly, these bash commands will
-fetch packages and set up dependencies (note that the above commands assume
-you're building for both iOS and Android, with both toolchains installed):
-
-```bash
-  #!/bin/bash
-  set -e
-
-  cd flutter_module_using_plugin
-  flutter pub get
-  cd ../flutter_module_books
-  flutter pub get
-  cd ../flutter_module
-  flutter pub get
-
-  # For Android builds:
-  flutter build aar
-
-  # For iOS builds:
-  flutter build ios-framework --xcframework --output=../ios_using_prebuilt_module/Flutter
-  cd ../ios_fullscreen
-  pod install
-  cd ../ios_using_plugin
-  pod install
-```
-
-Once those commands have run, you can go into any of the app directories (the
-ones beginning `android_` or `ios_`), and build the apps as you normally would.
-
 ## Installing Cocoapods
 
 The iOS samples in this repo require the latest version of Cocoapods. To make
@@ -57,191 +39,6 @@ sudo gem install cocoapods
 
 See https://guides.cocoapods.org/using/getting-started.html for more details.
 
-## The important bits
-
-### Flutter modules
-
-There are three Flutter modules included in the codebase:
-
-* `flutter_module` displays the dimensions of the screen, a button that
-  increments a simple counter, and an optional exit button.
-* `flutter_module_using_plugin` contains 2 programs. The main entrypoint does
-  everything `flutter_module` does and adds another button that will open the
-  Flutter documentation in a browser using the [`url_launcher`](https://pub.dev/packages/url_launcher)
-  Flutter plugin. A second `showCell` entrypoint displays a card meant to be
-  shown as a cell in a list.
-* `flutter_module_books` simulates an integration scenario with existing
-  platform business logic and middleware. It uses the [`pigeon`](https://pub.dev/packages/pigeon)
-  plugin to make integration easier by generating the platform channel
-  interop inside wrapper API and data classes that are shared between the
-  platform and Flutter.
-
-Before using them, you need to resolve the Flutter modules' dependencies. Do so
-by running this command from within the `flutter_module`,
-`flutter_module_using_plugin`, and `flutter_module_books` directories:
-
-```bash
-flutter pub get
-```
-
-### Android and iOS applications
-
-In addition to the Flutter modules, this repo also includes a number of
-Android and iOS applications that demonstrate different ways of importing
-them.
-
-With the exception of `android_using_prebuilt_module`, the Android apps are
-ready to run once you've completed the `flutter pub get` commands listed
-above. Two of the iOS apps (`ios_fullscreen` and `ios_using_plugin`) use
-Cocoapods, though, so you need to run this command within their project
-directories to install their dependencies:
-
-```bash
-pod install
-```
-
-Once that command is complete, you'll find an `xcworkspace` file in the project
-directories with the correct Flutter module (and any other dependencies)
-included. Open that workspace file, and the app is ready to build and run.
-
-### `android_fullscreen` and `ios_fullscreen`
-
-These apps showcase a relatively straightforward integration of
-`flutter_module`:
-
-* The Flutter module is built along with the app when the app is built.
-* The Flutter engine is warmed up at app launch.
-* The Flutter view is presented with a full-screen Activity or
-  UIViewController.
-* The Flutter view is a navigational leaf node; it does not launch any new,
-  native Activities or UIViewControllers in response to user actions.
-
-If you are new to Flutter's add-to-app APIs, these projects are a great place
-to begin learning how to use them.
-
-### `android_using_plugin` and `ios_plugin`
-
-These apps are similar to `android_fullscreen` and `ios_fullscreen`, with the
-following differences:
-
-* Rather than importing `flutter_module`, they import
-  `flutter_module_using_plugin`.
-* They include the native code (Kotlin or Swift) required to initialize plugins
-  at Flutter engine creation time.
-* Their Flutter view includes an additional button that opens the Flutter docs
-  in the mobile device's browser.
-
-If you're interested in learning what additional steps an app needs to take in
-order to use a Flutter module that relies on plugins, these projects can help.
-
-### `android_view`
-
-Rather than integrating Flutter as a fullscreen page, the `android_view` demo
-integrates a partial screen `FlutterView` into an Android `RecyclerView`.
-
-* Demonstrates the additional application specific plumbing needed to hook a
-  `FlutterView` to both a separate, application owned `FlutterEngine` and to its
-  host activity which has its own lifecycle. This is different than a relatively
-  more self-contained `FlutterActivity`.
-* Show how a single `FlutterView` can be used in multiple places in the Android
-  activity in a performant way.
-* Demonstrates a `FlutterView`-based UI interwoven seamlessly into a native
-  Android UI.
-* The Flutter cells use the [`sensors`](https://pub.dev/packages/sensors)
-  plugin and displays a Flutter logo, rotate based on the phone's current
-  orientation.
-
-### `android_using_prebuilt_module` and  `ios_using_prebuilt_module`
-
-These apps are essentially identical to `android_fullscreen` and
-`ios_fullscreen`, respectively, with one key difference. Rather than being set
-up to compile the `flutter_module` from source each time the app is built, they
-import a the module as a prebuilt `aar` (Android) or framework (iOS). This can
-be useful for teams that don't want to require every developer working on the
-app to have the Flutter toolchain installed on their local machines.
-
-Prior to building either project for the first time, the `flutter_module` needs
-to be built.
-
-**Building for `android_using_prebuilt_module`**
-
-To build `flutter_module` as an aar, run this command from the `flutter_module`
-directory:
-
-```bash
-flutter build aar
-```
-
-It will produce `aar` files for debug, profile, and release mode. The Android
-app is configured to import the appropriate `aar` based on its own build
-configuration, so if you build a debug version of the app, it will look
-for the debug `aar`, and so on.
-
-If the `flutter_module` project is updated, the `aar` files must be rebuilt via
-one of the commands above in order for those changes to appear in the app.
-
-**Building for `ios_using_prebuilt_module`**
-
-To build `flutter_module` as a set of frameworks, run this command from the
-`flutter_module` directory:
-
-```bash
-flutter build ios-framework --xcframework --output=../ios_using_prebuilt_module/Flutter
-```
-
-This will output frameworks for debug, profile, and release modes into
-`ios_using_prebuilt_module/Flutter`. The project file for
-`ios_using_prebuilt_module` has been configured to find the frameworks there.
-
-For more information on how to modify an existing iOS app to reference prebuilt
-Flutter frameworks, see this article in the Flutter GitHub wiki:
-
-https://flutter.dev/docs/development/add-to-app/ios/project-setup
-
-### `android_books` and `ios_books (TODO)`
-
-These apps integrate the `flutter_books` module using the simpler build-together
-project setup. They simulate a mock scenario where an existing book catalog
-list app already exists. Flutter is used to implement an additional book details
-page.
-
-* Similar to `android_fullscreen` and `ios_fullscreen`.
-* An existing books catalog app is already implemented in Kotlin and Swift.
-* The platform-side app has existing middleware constraints that should also
-  be the middleware foundation for the additional Flutter screen.
-    * On Android, the Kotlin app already uses GSON and OkHttp for networking and
-      references the Google Books API as a data source. These same libraries
-      also underpin the data fetched and shown in the Flutter screen.
-    * iOS TODO.
-* The platform application interfaces with the Flutter book details page using
-  idiomatic platform API conventions rather than Flutter conventions.
-    * On Android, the Flutter activity receives the book to show via activity
-      intent and returns the edited book by setting the result intent on the
-      activity. No Flutter concepts are leaked into the consumer activity.
-    * iOS TODO.
-* The [pigeon](https://pub.dev/packages/pigeon) plugin is used to generate
-  interop APIs and data classes. The same `Book` model class is used within the
-  Kotlin/Swift program, the Dart program and in the interop between Kotlin/Swift
-  and Dart. No manual platform channel plumbing needed for interop.
-    * The `api.dart/java/mm` files generated from the
-      `flutter_module_books/pigeon/schema.dart` file are checked into source
-      control. Therefore `pigeon` is only a dev dependency with no runtime
-      requirements.
-    * If the `schema.dart` is modified, the generated classes can be updated with
-
-        ```bash
-        flutter pub run pigeon \
-            --input pigeon/schema.dart \
-            --java_out ../android_books/app/src/main/java/dev/flutter/example/books/Api.java \
-            --java_package "dev.flutter.example.books"
-        ```
-
-      in the `flutter_module_books` directory.
-
-Once you've understood the basics of add-to-app with `android_fullscreen` and
-`ios_fullscreen`, this is a good sample to demonstrate how to integrate Flutter
-in a slightly more realistic setting with existing business logic.
-
 ## Questions/issues
 
 If you have a general question about incorporating Flutter into an existing

add_to_app/books/README.md

@@ -0,0 +1,79 @@
+# books
+
+Mimics a real world use-case of embedding Flutter into an existing Android app
+and demonstrates using [Pigeon](https://pub.dev/packages/pigeon) to communicate
+between Fluter and the host application.
+
+## Description
+
+These apps integrate the `flutter_books` module using the simpler build-together
+project setup. They simulate a mock scenario where an existing book catalog
+list app already exists. Flutter is used to implement an additional book details
+page.
+
+* Similar to [`fullscreen`](../fullscreen).
+* An existing books catalog app is already implemented in Kotlin and Swift.
+* The platform-side app has existing middleware constraints that should also
+  be the middleware foundation for the additional Flutter screen.
+  * On Android, the Kotlin app already uses GSON and OkHttp for networking and
+    references the Google Books API as a data source. These same libraries also
+    underpin the data fetched and shown in the Flutter screen.
+  * iOS TODO.
+* The platform application interfaces with the Flutter book details page using
+  idiomatic platform API conventions rather than Flutter conventions.
+  * On Android, the Flutter activity receives the book to show via activity
+    intent and returns the edited book by setting the result intent on the
+    activity. No Flutter concepts are leaked into the consumer activity.
+  * iOS TODO.
+* The [pigeon](https://pub.dev/packages/pigeon) plugin is used to generate
+  interop APIs and data classes. The same `Book` model class is used within the
+  Kotlin/Swift program, the Dart program and in the interop between Kotlin/Swift
+  and Dart. No manual platform channel plumbing needed for interop.
+  * The `api.dart/java/mm` files generated from the
+    `flutter_module_books/pigeon/schema.dart` file are checked into source
+    control. Therefore `pigeon` is only a dev dependency with no runtime
+    requirements.
+  * If the `schema.dart` is modified, the generated classes can be updated with
+
+      ```bash
+      flutter pub run pigeon \
+          --input pigeon/schema.dart \
+          --java_out ../android_books/app/src/main/java/dev/flutter/example/books/Api.java \
+          --java_package "dev.flutter.example.books"
+      ```
+
+      in the `flutter_module_books` directory.
+
+Once you've understood the basics of add-to-app with `android_fullscreen` and
+`ios_fullscreen`, this is a good sample to demonstrate how to integrate Flutter
+in a slightly more realistic setting with existing business logic.
+
+## tl;dr
+
+If you're just looking to get up and running quickly, these bash commands will
+fetch packages and set up dependencies (note that the above commands assume
+you're building for both iOS and Android, with both toolchains installed):
+
+```bash
+  #!/bin/bash
+  set -e
+
+  cd flutter_module_books/
+  flutter pub get
+
+  # For Android builds:
+  open -a "Android Studio" ../android_books # macOS only
+  # Or open the ../android_books folder in Android Studio for other platforms.
+
+  # For iOS builds:
+  # TODO iOS sample
+```
+
+## Requirements
+
+* Flutter
+* Android Studio
+
+## Questions/issues
+
+See [add_to_app/README.md](../README.md) for further help.

add_to_app/books/flutter_module_books/README.md

@@ -3,9 +3,7 @@
 This application simulates a mock scenario in which an existing app with
 business logic and middleware already exists. It demonstrates how to add Flutter
 to an app that has established patterns for these domains. For more information
-this and the other add-to-app samples available in this repo, see the
-[README](../README.md) file located in the [/add_to_app](/add_to_app) directory
-of this repo.
+on how to use it, see the [README.md](../README.md) parent directory.
 
 This application also utilizes the [Pigeon](https://pub.dev/packages/pigeon)
 plugin to avoid manual platform channel wiring. Pigeon autogenerates the

add_to_app/fullscreen/README.md

@@ -0,0 +1,54 @@
+# fullscreen
+
+Embeds a full screen instance of Flutter into an existing iOS or Android app.
+
+## Description
+
+These apps showcase a relatively straightforward integration of
+`flutter_module`:
+
+* The Flutter module is built along with the app when the app is built.
+* The Flutter engine is warmed up at app launch.
+* The Flutter view is presented with a full-screen Activity or
+  UIViewController.
+* The Flutter view is a navigational leaf node; it does not launch any new,
+  native Activities or UIViewControllers in response to user actions.
+
+If you are new to Flutter's add-to-app APIs, these projects are a great place
+to begin learning how to use them.
+
+## tl;dr
+
+If you're just looking to get up and running quickly, these bash commands will
+fetch packages and set up dependencies (note that the above commands assume
+you're building for both iOS and Android, with both toolchains installed):
+
+```bash
+  #!/bin/bash
+  set -e
+
+  cd flutter_module/
+  flutter pub get
+
+  # For Android builds:
+  open -a "Android Studio" ../android_fullscreen # macOS only
+  # Or open the ../android_fullscreen folder in Android Studio for other platforms.
+
+  # For iOS builds:
+  cd ../ios_fullscreen
+  pod install
+  open IOSFullScreen.xcworkspace
+```
+
+## Requirements
+
+* Flutter
+* Android
+  * Android Studio
+* iOS
+  * Xcode
+  * Cocoapods
+
+## Questions/issues
+
+See [add_to_app/README.md](../README.md) for further help.

add_to_app/fullscreen/flutter_module/README.md

@@ -1,8 +1,8 @@
 # flutter_module
 
 An example Flutter module used in the Flutter add-to-app samples. For more
-information on how to use it, see the [README](../README.md) file located in the
-[/add_to_app](/add_to_app) directory of this repo.
+information on how to use it, see the [README.md](../README.md) parent
+directory.
 
 ## Getting Started