Android 9 Development Cookbook - Third Edition

Reading sensor data – using Android Sensor Framework events

The previous recipe, Listing available sensors – an introduction to the Android Sensor Framework, provided an introduction to the Android Sensor Framework. Now, we'll look at reading sensor data using SensorEventListener. The SensorEventListener interface only has two callbacks:

• onSensorChanged()
• onAccuracyChanged()

When the sensor has new data to report, it calls onSensorChanged() with a SensorEvent object. This recipe will demonstrate reading a light sensor, but since all the sensors use the same framework, it's very easy to adapt this example to any of the other sensors. (See the list of sensor types available in the previous recipe's introduction.)