Android BarCode Scanner Tutorial

//dependency for bar code scannercompile 'com.journeyapps:zxing-android-embedded:3.4.0'

package com.example.gangsofcoder.testdemo.BarCodeScanner;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.example.gangsofcoder.testdemo.R;
import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;


public class BarCodeScanner extends AppCompatActivity {
    private TextView tvName;
    private Button btnScanCode;
    private IntentIntegrator qrScannner;

    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.scanner_layout);
        tvName = (TextView) findViewById(R.id.tvName);
        btnScanCode = (Button) findViewById(R.id.btnScan);
        //Here initialize scanning object        qrScannner = new IntentIntegrator(this);
        qrScannner.setOrientationLocked(false);
        qrScannner.setPrompt("SCANNING...");
        qrScannner.setBeepEnabled(true);
        btnScanCode.setOnClickListener(new View.OnClickListener() {
            @Override            public void onClick(View v) {
                //Here intialization of
                qrScannner.initiateScan();
            }
        });
    }

    //call after scanning bar code    @Override    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
        if (result != null) {
            if (result.getContents() == null) {
                Toast.makeText(this, "Nothing Found", Toast.LENGTH_LONG).show();
            } else {
                try {
                    tvName.setText(result.getContents());
                } catch (Exception e) {
                    e.printStackTrace();
                    Toast.makeText(this, result.getContents(), Toast.LENGTH_LONG).show();
                }
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }
}