How to know if a sensor is present on my Android device?

Question

i would like to know if a sensor (for exemple the accellerometer) is present on my Android device.

I am dealing with the SensorManager class. Here is the code I am using:

sensorMgr = (SensorManager) getSystemService(SENSOR_SERVICE);
sensorMgr.registerListener(this,sensorMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),1);

Thank you.

Answer 1

take a look in here:

http://developer.android.com/reference/android/content/pm/PackageManager.html

if think you need to do that:

PackageManager manager = getPackageManager();
boolean hasAccelerometer = manager.hasSystemFeature(PackageManager.FEATURE_SENSOR_ACCELEROMETER);

Answer 2

Here is recomendation from developer.android.com: http://developer.android.com/guide/topics/sensors/sensors_overview.html#sensors-identify

You can determine whether a specific type of sensor exists on a device by using the getDefaultSensor() method and passing in the type constant for a specific sensor. If a device has more than one sensor of a given type, one of the sensors must be designated as the default sensor. If a default sensor does not exist for a given type of sensor, the method call returns null, which means the device does not have that type of sensor.

private SensorManager mSensorManager;
...
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
if (mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD) != null){
  // Success! There's a magnetometer.
}
else {
  // Failure! No magnetometer.
}