Android APIs
Added in API level 1
Deprecated since API level 3
public abstract class

OrientationListener

extends Object
implements SensorListener
java.lang.Object
   ↳ android.view.OrientationListener

This class was deprecated in API level 3.
use OrientationEventListener instead. This class internally uses the OrientationEventListener.

Class Overview

Helper class for receiving notifications from the SensorManager when the orientation of the device has changed.

Summary

Constants
int ORIENTATION_UNKNOWN Returned from onOrientationChanged when the device orientation cannot be determined (typically when the device is in a close to flat position).
Public Constructors
OrientationListener(Context context)
Creates a new OrientationListener.
OrientationListener(Context context, int rate)
Creates a new OrientationListener.
Public Methods
void disable()
Disables the OrientationListener.
void enable()
Enables the OrientationListener so it will monitor the sensor and call onOrientationChanged(int) when the device orientation changes.
void onAccuracyChanged(int sensor, int accuracy)
Called when the accuracy of a sensor has changed.
abstract void onOrientationChanged(int orientation)
Look at onOrientationChanged(int) for method description and usage
void onSensorChanged(int sensor, float[] values)

Called when sensor values have changed.

[Expand]
Inherited Methods
From class java.lang.Object
From interface android.hardware.SensorListener

Constants

public static final int ORIENTATION_UNKNOWN

Added in API level 1

Returned from onOrientationChanged when the device orientation cannot be determined (typically when the device is in a close to flat position).

Constant Value: -1 (0xffffffff)

Public Constructors

public OrientationListener (Context context)

Added in API level 1

Creates a new OrientationListener.

Parameters
context Context: for the OrientationListener.

public OrientationListener (Context context, int rate)

Added in API level 3

Creates a new OrientationListener.

Parameters
context Context: for the OrientationListener.
rate int: at which sensor events are processed (see also SensorManager). Use the default value of SENSOR_DELAY_NORMAL for simple screen orientation change detection.

Public Methods

public void disable ()

Added in API level 1

Disables the OrientationListener.

public void enable ()

Added in API level 1

Enables the OrientationListener so it will monitor the sensor and call onOrientationChanged(int) when the device orientation changes.

public void onAccuracyChanged (int sensor, int accuracy)

Added in API level 1

Called when the accuracy of a sensor has changed. See SensorManager for details.

Parameters
sensor int: The ID of the sensor being monitored
accuracy int: The new accuracy of this sensor.

public abstract void onOrientationChanged (int orientation)

Added in API level 1

Look at onOrientationChanged(int) for method description and usage

Parameters
orientation int: The new orientation of the device.

public void onSensorChanged (int sensor, float[] values)

Added in API level 1

Called when sensor values have changed. The length and contents of the values array vary depending on which sensor is being monitored. See SensorManager for details on possible sensor types.

Definition of the coordinate system used below.

The X axis refers to the screen's horizontal axis (the small edge in portrait mode, the long edge in landscape mode) and points to the right.

The Y axis refers to the screen's vertical axis and points towards the top of the screen (the origin is in the lower-left corner).

The Z axis points toward the sky when the device is lying on its back on a table.

IMPORTANT NOTE: The axis are swapped when the device's screen orientation changes. To access the unswapped values, use indices 3, 4 and 5 in values[].

SENSOR_ORIENTATION, SENSOR_ORIENTATION_RAW:

All values are angles in degrees.

values[0]: Azimuth, rotation around the Z axis (0<=azimuth<360). 0 = North, 90 = East, 180 = South, 270 = West

values[1]: Pitch, rotation around X axis (-180<=pitch<=180), with positive values when the z-axis moves toward the y-axis.

values[2]: Roll, rotation around Y axis (-90<=roll<=90), with positive values when the z-axis moves toward the x-axis.

Note that this definition of yaw, pitch and roll is different from the traditional definition used in aviation where the X axis is along the long side of the plane (tail to nose).

SENSOR_ACCELEROMETER:

All values are in SI units (m/s^2) and measure contact forces.

values[0]: force applied by the device on the x-axis

values[1]: force applied by the device on the y-axis

values[2]: force applied by the device on the z-axis

Examples:

  • When the device is pushed on its left side toward the right, the x acceleration value is negative (the device applies a reaction force to the push toward the left)
  • When the device lies flat on a table, the acceleration value is -STANDARD_GRAVITY, which correspond to the force the device applies on the table in reaction to gravity.
  • SENSOR_MAGNETIC_FIELD:

    All values are in micro-Tesla (uT) and measure the ambient magnetic field in the X, Y and -Z axis.

    Note: the magnetic field's Z axis is inverted.

    Parameters
    sensor int: The ID of the sensor being monitored
    values float: The new values for the sensor.