open coding. 안드로이드 스튜디오 근접센서 기본코딩 proximity sensor

package com.www.proximitysensor;

import androidx.appcompat.app.AppCompatActivity;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    //define variables
    TextView textView;

    SensorManager manager;
    SensorListener listener;

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

        //connect to xml
        textView = findViewById(R.id.textView);

        manager = (SensorManager) getSystemService(SENSOR_SERVICE); //각 객체 설정
        listener = new SensorListener();

    }//finish

//sensor start method -> onclick도 설정
    public void startSensor(View view){
        Sensor sensor = manager.getDefaultSensor(Sensor.TYPE_PROXIMITY);    //근접 센서
        //아래 만들었던 리스너 연결
        boolean chk =manager.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);
        if(chk == false){
            textView.setText("근접 센서를 지원하지 않습니다.");
        }
    }


//sensor stop method -> onclick 도 설정
    public void stopSensor(View view){
        manager.unregisterListener(listener);
    }


//sensor data 받기 listener 설정
    class SensorListener implements SensorEventListener {
        @Override
        public void onSensorChanged(SensorEvent event) {//센서변화
            if(event.sensor.getType() == Sensor.TYPE_PROXIMITY){    //근접접 센서라면
               textView.setText("물체와의 거리 : "+event.values[0] + "cm");
            }
        }
        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {//감도변화

        }
    }//finish


}