private SensorManager mSensorManager;

public void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	setContentView(R.layout.main);
	
	// Get the texts fields of the layout and set to invisible
	TextView sensorCountText = 
		(TextView) findViewById(R.id.sensorCountText);
	TextView sensorNamesText = 
		(TextView) findViewById(R.id.sensorNamesText);
	
	// Get the SensorManager
	mSensorManager = 
		(SensorManager) getSystemService(Context.SENSOR_SERVICE);
	
	// get a list of available sensors
	List<Sensor> sensors = 
		mSensorManager.getSensorList(Sensor.TYPE_ALL);
		
	// Print how may Sensors there are
	sensorCountText.setText(sensors.size() +" sensors available.");
	
	// Print the name of each Sensor
	StringBuilder out = new StringBuilder();
	for(Sensor s : sensors){		
		out.append(s.getName()).append("\n");
	}
	sensorNamesText.setText(out.toString());
}