Sensor.TYPE_GRAVITY
| Type | Description | Common Uses |
|---|---|---|
| Software or Hardware | Measures the force of gravity in m/s2 that is applied to a device on all three physical axes (x, y, z). | Motion detection (shake, tilt, etc.). |
Sensor.TYPE_LINEAR_ACCELERATION
| Type | Description | Common Uses |
|---|---|---|
| Software or Hardware | Measures the acceleration force in m/s2 that is applied to a device on all three physical axes (x, y, and z), excluding the force of gravity. | Monitoring acceleration along a single axis. |
Example: How to filter acceleration sensor data to get the force of gravity and the linear acceleration.
public void onSensorChanged(SensorEvent event){
// In this example, alpha is calculated as t / (t + dT),
// where t is the low-pass filter's time-constant and
// dT is the event delivery rate.
final float alpha = 0.8;
// Isolate the force of gravity with the low-pass filter.
gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];
// Remove the gravity contribution with the high-pass filter.
linear_acceleration[0] = event.values[0] - gravity[0];
linear_acceleration[1] = event.values[1] - gravity[1];
linear_acceleration[2] = event.values[2] - gravity[2];
}