Scan QR Android

Step 1: Add dependencies

implementation 'com.journeyapps:zxing-android-embedded:4.3.0'

Step 2: Uses-permission manifest

<uses-permission android:name="android.permission.CAMERA" />

Step 3:  MainAitivity

package com.grt.scanqrcodeandroid;

import android.os.Bundle;
import android.widget.Toast;
import android.content.Intent;

import androidx.appcompat.app.AppCompatActivity;

import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        IntentIntegrator integrator = new IntentIntegrator(this);
        integrator.setDesiredBarcodeFormats(IntentIntegrator.QR_CODE);
        integrator.setPrompt("Scan a QR code");
        integrator.setCameraId(0);
        integrator.setBeepEnabled(false);
        integrator.setBarcodeImageEnabled(true);
        integrator.initiateScan();
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        IntentResult result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
        if (result != null) {
            if (result.getContents() != null) {

                String qrCodeValue = result.getContents();
                Toast.makeText(this, "QR Code: " + qrCodeValue, Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(this, "No QR code found", Toast.LENGTH_SHORT).show();
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }
}