Implementation Prerequisites - Learn OpenGL ES: For Mobile Game and Graphics Development - page 63

SensorEvent event . You may wonder how frequently SensorEvent reports
new values. While registering a listener, we must also specify the delay or meas-
urement rate for the listener. These rates are defined as static constants inside the
SensorManager class ( Listing 2-14 ).

Listing 2-14. SENSOR ROTATION/src/com/apress/android/sensorrotation/

Main.java

sm.registerListener(this,
sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_NORMAL);
sm.registerListener(this,
sm.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD),
SensorManager.SENSOR_DELAY_NORMAL);
sm.registerListener(this,
sm.getDefaultSensor(Sensor.TYPE_GRAVITY),
SensorManager.SENSOR_DELAY_NORMAL);

Figure 2-17 . Rotating arrow using motion and position sensors

Apart from reporting raw sensor data, the SensorEvent object also lets us know
about the accuracy of data returned, so we can stop processing the data if it cannot
be trusted ( Listing 2-15 ).