......

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    // Get the texts fields of the layout and setup to invisible
    mSensorsTot   = (TextView) findViewById(R.id.sensoritot);
    mSensorAvailables  = (TextView) findViewById(R.id.sensoridisponibili);

    // Get the SensorManager 
    mSensorManager= (SensorManager) getSystemService(SENSOR_SERVICE);

    // List of Sensors Available
    List<Sensor> msensorList = mSensorManager.getSensorList(SensorManager.SENSOR_ALL);

    // Print how may Sensors are there
    mSensorsTot.setText(msensorList.size()+" "+this.getString(R.string.sensors)+"!");

    // Print each Sensor available using sSensList as the String to be printed
    String sSensList = new String("");
    Sensor tmp;
    int x,i;
    for (i=0;i<msensorList.size();i++){
     tmp = msensorList.get(i);
     sSensList = " "+sSensList+tmp.getName(); // Add the sensor name to the string of sensors available
    }
    // if there are sensors available show the list
    if (i>0){
     sSensList = getString(R.string.sensors)+":"+sSensList;
     mSensorAvailables.setText(sSensList);
    }
}