Instanciation du service sous Android

Bonjour
Pour instancier un service sous Android voici le code démonstratif:

SensorManager sMgr =
(SensorManager)getSystemService(SENSOR_SERVICE);
boolean accelSupported = sMgr.registerListener(
this,sMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
SensorManager.SENSOR_DELAY_UI);
if (!accelSupported) {
sMgr.unregisterListener(this,
sMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER));
((TextView)findViewById(R.id.acc)).setText("Pas d’accelerometre");
}

Pour lister ou récupérer un capteur particulier, il suffit d'instancier le SensorManager et ses méthodes getSensorList ou getDefaultSensor.

!!!
/** * The sensor manager */
SensorManager sensorManager;

/* * (non-Javadoc) * * @see android.app.Activity#onCreate(android.os.Bundle) */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Instanicer le SensorManager
sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
// Faire la liste des capteurs de l'appareil
listSensor();
}


/************************************************************************************/
/** Lister les capteurs existant ****************************************************************/
/************************************************************************************/
/** * Trouve la liste de tous les capteurs existants, trouve un capteur spécifique ou l'ensemble des capteurs d'un type fixé. */
private void listSensor() {
// Trouver tous les capteurs de l'appareil :
List<Sensor> sensors = sensorManager.getSensorList(Sensor.TYPE_ALL);
// La chaîne descriptive de chaque capteur
StringBuffer sensorDesc = new StringBuffer();
//pour chaque capteur trouvé, construire sa chaîne descriptive
for (Sensor sensor : sensors) {
sensorDesc.append("New sensor detected : \r\n");
sensorDesc.append("\tName: " + sensor.getName() + "\r\n");
sensorDesc.append("\tType: " + getType(sensor.getType()) + "\r\n");
sensorDesc.append("Version: " + sensor.getVersion() + "\r\n");
sensorDesc.append("Resolution (in the sensor unit): " + sensor.getResolution() + "\r\n");
sensorDesc.append("Power in mA used by this sensor while in use" + sensor.getPower() +
"\r\n");
sensorDesc.append("Vendor: " + sensor.getVendor() + "\r\n");
sensorDesc.append("Maximum range of the sensor in the sensor's unit." +
sensor.getMaximumRange() + "\r\n");
sensorDesc.append("Minimum delay allowed between two events in microsecond"
+ " or zero if this sensor only returns a value when the data it's measuring changes"
+ sensor.getMinDelay() + "\r\n");
}
//Faire quelque chose de cette liste
Toast.makeText(this, sensorDesc.toString(), Toast.LENGTH_LONG).show();

// Pour trouver un capteur spécifique&#160;:
Sensor gyroscopeDefault = sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
// Pour trouver tous les capteurs d'un type fixé :
List<Sensor> gyroscopes = sensorManager.getSensorList(Sensor.TYPE_GYROSCOPE);
}

/**
* @param type
* the integer type
* @return the type as a string
*/
private String getType(int type) {
String strType;
switch (type) {
case Sensor.TYPE_ACCELEROMETER: strType = "TYPE_ACCELEROMETER";break;
case Sensor.TYPE_GRAVITY:strType = "TYPE_GRAVITY";break;
case Sensor.TYPE_GYROSCOPE: strType = "TYPE_GYROSCOPE"; break;
case Sensor.TYPE_LIGHT:strType = "TYPE_LIGHT";break;
case Sensor.TYPE_LINEAR_ACCELERATION:strType = "TYPE_LINEAR_ACCELERATION";
break;
case Sensor.TYPE_MAGNETIC_FIELD:strType = "TYPE_MAGNETIC_FIELD";break;
case Sensor.TYPE_ORIENTATION:strType = "TYPE_ORIENTATION";break;
case Sensor.TYPE_PRESSURE:strType = "TYPE_PRESSURE";break;
case Sensor.TYPE_PROXIMITY: strType = "TYPE_PROXIMITY"; break;
case Sensor.TYPE_ROTATION_VECTOR: strType = "TYPE_ROTATION_VECTOR";break;
case Sensor.TYPE_TEMPERATURE:strType = "TYPE_TEMPERATURE";break;
default: strType = "TYPE_UNKNOW";break;
}
return strType;
}