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CosmosClient / app / src / main / java / com / example / cosmosclient / views / QRcodeReadingActivity.java
package com.example.cosmosclient.views;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import com.example.cosmosclient.R;
import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;
import com.journeyapps.barcodescanner.CaptureActivity;

public class QRcodeReadingActivity extends CaptureActivity {
    public String QRcodeData = null;
    TextView QRcodeResult;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_qrcode_reading);
        QRcodeResult = findViewById(R.id.QRcodeResult);

        //ここでQRコードリーダーオブジェクト生成
        IntentIntegrator integrator = new IntentIntegrator(this);
//        new IntentIntegrator(QRcodeReadingActivity.this).initiateScan();
        // スキャン画面の回転の制御
        integrator.setOrientationLocked(false);
        //バーコードリーダーの起動
        integrator.initiateScan();

    }

    //QRコードから読み取った結果の取得
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
        if(result != null) {
            QRcodeData = (String)result.getContents();
            QRcodeResult.setText(QRcodeData);
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}