Book Image

Android Things Projects

By : Francesco Azzola
Book Image

Android Things Projects

By: Francesco Azzola

Overview of this book

Android Things makes developing connected embedded devices easy by providing the same Android development tools, best-in-class Android framework, and Google APIs that make developers successful on mobile. With this book, you will be able to take advantage of the new Android framework APIs to securely build projects using low-level components such as sensors, resistors, capacitors, and display controllers. This book will teach you all you need to know about working with Android Things through practical projects based on home automation, robotics, IoT, and so on. We’ll teach you to make the most of the Android Things and build enticing projects such as a smart greenhouse that controls the climate and environment automatically. You’ll also create an alarm system, integrate Android Things with IoT cloud platforms, and more. By the end of this book, you will know everything about Android Things, and you’ll have built some very cool projects using the latest technology that is driving the adoption of IoT. You will also have primed your mindset so that you can use your knowledge for profitable, practical projects.
Table of Contents (15 chapters)
Title Page
About the Author
About the Reviewers
Customer Feedback

How to close the sensor connection

When the Android Things app is destroyed, it is important to release all the connections we have used to exchange data with the sensor and remove all listeners. In this way, we free all the resources used by the app. In more details, we have to release the SDA pin used to communicate to the sensor so that other apps can reuse it. In order to destroy the app gracefully, we have to execute the following steps:

  1. Unregister the sensor listener we have used to listen to value changes.
  2. Unregister the sensor listener we have used to know when the sensor is connected to the Android Things board.
  3. Close the sensor connection.

The best approach is executing the previous steps in the onDestroy method of our monitoring app. The following code describes how to implement these steps:

protected void onDestroy() { super.onDestroy(); Log.d(TAG, "onDestroy");
sensorManager.unregisterListener(tempCallback); sensorManager.unregisterListener(pressCallback); mySensorDriver...