Androidで地磁気センサーの値が取れない問題

	@Override
	public void onSensorChanged(SensorEvent event) {

		if (event.accuracy == SensorManager.SENSOR_STATUS_UNRELIABLE) {
			return;
		}

		switch (event.sensor.getType()) {
		case Sensor.TYPE_MAGNETIC_FIELD:
			magneticValues = event.values.clone(); // ■ここに来ない
			break;
		case Sensor.TYPE_ACCELEROMETER:
			accelerometerValues = event.values.clone();
			break;
		}

		// do something ...

	}