Androidの近接センサーアプリを作ってみました

public class MainActivity extends AppCompatActivity implements SensorEventListener {

    private SensorManager mSensorManager;
    private Sensor mProximity;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // センサーオブジェクトを取得
        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);

        // 近接センサーのオブジェクトを取得
        mProximity = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);

    }

    @Override
    protected void onResume() {
        super.onResume();
　　　　　// 近接センサーを有効
        mSensorManager.registerListener(this, mProximity, SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onPause() {
        super.onPause();
        // 近接センサーを無効
        mSensorManager.unregisterListener(this);
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_PROXIMITY) {
            // values = 5 or 0
            if (event.values[0] > 0 ) {
                //near
                Toast.makeText(getApplicationContext(), "far", Toast.LENGTH_SHORT).show();
            } else {
                //far
                Toast.makeText(getApplicationContext(), "near", Toast.LENGTH_SHORT).show();
            }
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }
}