环境传感器

class SensorActivity : Activity(), SensorEventListener {

    private lateinit var sensorManager: SensorManager
    private var pressure: Sensor? = null

    public override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.main)

        // Get an instance of the sensor service, and use that to get an instance of
        // a particular sensor.
        sensorManager = getSystemService(Context.SENSOR_SERVICE) as SensorManager
        pressure = sensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE)
    }

    override fun onAccuracyChanged(sensor: Sensor, accuracy: Int) {
        // Do something here if sensor accuracy changes.
    }

    override fun onSensorChanged(event: SensorEvent) {
        val millibarsOfPressure = event.values[0]
        // Do something with this sensor data.
    }

    override fun onResume() {
        // Register a listener for the sensor.
        super.onResume()
        sensorManager.registerListener(this, pressure, SensorManager.SENSOR_DELAY_NORMAL)
    }

    override fun onPause() {
        // Be sure to unregister the sensor when the activity pauses.
        super.onPause()
        sensorManager.unregisterListener(this)
    }
}

public class SensorActivity extends Activity implements SensorEventListener {
    private SensorManager sensorManager;
    private Sensor pressure;

    @Override
    public final void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);

      // Get an instance of the sensor service, and use that to get an instance of
      // a particular sensor.
      sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
      pressure = sensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE);
    }

    @Override
    public final void onAccuracyChanged(Sensor sensor, int accuracy) {
      // Do something here if sensor accuracy changes.
    }

    @Override
    public final void onSensorChanged(SensorEvent event) {
      float millibarsOfPressure = event.values[0];
      // Do something with this sensor data.
    }

    @Override
    protected void onResume() {
      // Register a listener for the sensor.
      super.onResume();
      sensorManager.registerListener(this, pressure, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onPause() {
      // Be sure to unregister the sensor when the activity pauses.
      super.onPause();
      sensorManager.unregisterListener(this);
    }
}