实现接口  SensorEventListener

实例化：

private SensorManager sm = (SensorManager) getSystemService(SENSOR_SERVICE);private Sensor sensor = sm.getDefaultSensor(Sensor.TYPE_PROXIMITY);     sm.registerListener(this, sensor, SensorManager.SENSOR_DELAY_GAME);@Override  public void onAccuracyChanged(Sensor arg0, int arg1) {    Log.debug(TAG, "onAccuracyChanged:" + arg1);  }@Override  public void onSensorChanged(SensorEvent event) {    float[] types = event.values;    if (types[0] == 0.0) {      Log.debug(TAG, "onSensorChanged: hand in");    } else {       Log.debug(TAG, "onSensorChanged: hand out");    }      }