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User space driver in Android Things

Devfest Kyoto 2018

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自己紹介

Takuya Kubota�@kubotaku1119

  • GDG京都 Co-organizer
  • mui Lab, Inc. �Software Architect�

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User space driver

in Android Things

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Extends the core Android framework with additional APIs

Android Things Framework

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Google Play Services

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Management console

Manage and push OTA update package

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Available update management APIs.

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https://developer.android.com/things/hardware/

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User space driver

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Out of sight until needed�Out of mind until utilized�https://mui.jp

​

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Out of sight until needed�Out of mind until utilized�https://mui.jp

​

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Hardware Component

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Hardware Component

Android Things

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Hardware Component

Android Things

Peripheral I/O APIs

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Hardware Component

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Hardware Component

Original Listener

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Hardware Component

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Hardware Component

Original Listener

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Touch Eventは通常、

システムからViewに通知される

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Listenerのせいで

Viewが活用できなぁああい！！！

※某ハリウッド俳優のテンションで読んでください

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そこで

User space driverを使う

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User space driver

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User space driver

  • 他のアプリやデバイスで利用する際の移植性�
  • 既存コードの再利用性（公開されているドライバー）�
  • GestureDetectorやLocation API等との統合性

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Hardware Component

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private void initialize() {

// Input Driver生成と登録� mDriver = InputDriver.builder()� .setName(DRIVER_NAME)� .setAxisConfiguration(MotionEvent.AXIS_X, 0, 255, 0, 0)� .setAxisConfiguration(MotionEvent.AXIS_Y, 0, 255, 0, 0)� .build();�� UserDriverManager manager = UserDriverManager.getInstance();� manager.registerInputDriver(mDriver);

}

// A state change has occurred�private void triggerEvent(int x, int y, boolean pressed) {

// Eventを発行（MotionEventとして通知される）� InputDriverEvent event = new InputDriverEvent();� event.setPosition(MotionEvent.AXIS_X, x);� event.setPosition(MotionEvent.AXIS_Y, y);� event.setContact(pressed);�� mDriver.emit(event);�}

https://developer.android.com/things/sdk/drivers/input

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デモ

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まとめ

  • User driverで独自デバイスのイベントをシステムイベントに統合できる�
  • ただしinput deiverはTrackPadのような動作になってしまうので注意(現行の仕様)�
  • 自分でMotionEventをdispatchして回避する(バッドノウハウ)

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Coming Soon!!!

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Coming Soon!!!

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Thank you

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