android device angle to vertical axis
I am developing an application where I would require to retrieve the angle between the device and the vertical axis (the axis pointing to the center of the Earth).
So far, all the documen开发者_高级运维tations and tutorials I found were not very conclusive.
Could you please explain me how can I do this or provide me with a link to a clear tutorial to help me find a solution to this problem?
First, I created a SensorEventListener implementation
private SensorEventListener sensorEventListener =
new SensorEventListener() {
/** The side that is currently up */
//private Side currentSide = null;
//private Side oldSide = null;
private float azimuth;
private float pitch;
private float roll;
public void onAccuracyChanged(Sensor sensor, int accuracy) {}
public void onSensorChanged(SensorEvent event) {
azimuth = event.values[0]; // azimuth
pitch = event.values[1]; // pitch
roll = event.values[2]; // roll
//code to deal with orientation changes;
//pitch is the angle between the vertical axis and the device's y axis (the one from the center of the device to its top)
}
};
Then, I register this listener to an Orientation Sensor
SensorManager sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
Sensor sensor;
List<Sensor> sensors = sensorManager.getSensorList(
Sensor.TYPE_ORIENTATION);
if (sensors.size() > 0) {
sensor = sensors.get(0);
sensorManager.registerListener(
sensorEventListener, sensor,
SensorManager.SENSOR_DELAY_NORMAL);
} else {
//notify the user that there's no orientation sensor
}
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