QR Code Scanner Android Kotlin

..............................................................................................................

//Zxing for Bar code scanning
implementation 'com.journeyapps:zxing-android-embedded:4.2.0'
implementation 'com.budiyev.android:code-scanner:2.1.0'
implementation 'com.karumi:dexter:6.2.3'

Main Activity................................................................. 

package com.holisol.cerebrum.QRScan

import android.content.Intent
import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import com.budiyev.android.codescanner.*
import com.holisol.cerebrum.R
import kotlinx.android.synthetic.main.activity_bar_code_scanner.*
import java.text.SimpleDateFormat
import java.util.*


class QRCodeScannerActivity : AppCompatActivity() {

    private lateinit var codeScanner: CodeScanner

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_bar_code_scanner)

//        val TimeStamp: String = java.lang.String.valueOf(
//            java.util.concurrent.TimeUnit.MILLISECONDS.toSeconds(
//                System.currentTimeMillis()
//            )
//        )
        val s = SimpleDateFormat("dd:MM:yyyy,hh:mm:ss")
        val format: String = s.format(Date())


        val scannerView = findViewById<CodeScannerView>(R.id.scanner_view)
        codeScanner = CodeScanner(this, scannerView)

        // Parameters (default values)
        codeScanner.camera = CodeScanner.CAMERA_BACK // or CAMERA_FRONT or specific camera id
        codeScanner.formats = CodeScanner.ALL_FORMATS // list of type BarcodeFormat,
        // ex. listOf(BarcodeFormat.QR_CODE)
        codeScanner.autoFocusMode =AutoFocusMode.SAFE // or CONTINUOUS
        codeScanner.scanMode = ScanMode.SINGLE // or CONTINUOUS or PREVIEW
        codeScanner.isAutoFocusEnabled = true // Whether to enable auto focus or not
        codeScanner.isFlashEnabled = false // Whether to enable flash or not

        // Callbacks
        codeScanner.decodeCallback = DecodeCallback {
            runOnUiThread {
//                   Toast.makeText(this, "Scan result: ${it.text}", Toast.LENGTH_LONG).show()
                val sendData = Intent(
                    this@QRCodeScannerActivity,
                    ScanResultActivity::class.java
                )

                sendData.putExtra("RESULT", it.text.toString())
                sendData.putExtra("BarCodeFormat",it.barcodeFormat.toString())
                sendData.putExtra("resultMetadata",it.resultMetadata.toString())
                sendData.putExtra("resultPoints",it.resultPoints.toString())
                sendData.putExtra("resultMetadata",it.resultMetadata.toString())
                sendData.putExtra("timestamp",format)


                startActivity(sendData)
//                val scanresult = {it.text}
//                val bundle = Bundle()
//                bundle.putString("scrslt", scanresult.toString())
//                // set Fragmentclass Arguments
//                val fragobj = ScanResultFragment()
//                fragobj.setArguments(bundle)

            }



        }
        codeScanner.errorCallback = ErrorCallback { // or ErrorCallback.SUPPRESS
            runOnUiThread {
                Toast.makeText(this, "Camera initialization error: ${it.message}",
                    Toast.LENGTH_LONG).show()
            }
        }

        scannerView.setOnClickListener {
//            codeScanner.startPreview()
        }
    }

    override fun onResume() {
        super.onResume()
        codeScanner.startPreview()
    }

    override fun onPause() {
        codeScanner.releaseResources()
        super.onPause()
    }
}

.....................................................................
Activity scanner:-

package com.holisol.cerebrum.QRScan

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.holisol.cerebrum.R
import kotlinx.android.synthetic.main.activity_scan_result.*

class ScanResultActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_scan_result)
        val result = intent.getStringExtra("RESULT")
        val format = intent.getStringExtra("BarCodeFormat")
        val resultMetadata = intent.getStringExtra("resultMetadata")
        val resultPoints = intent.getStringExtra("resultPoints")
        val timestamp = intent.getStringExtra("timestamp")

        IDActivityScanResult.setText(result)
        IDActivityScanformat.setText(format)
        IDActivityScanresultPoints.setText(resultPoints)
        IDActivityScanresultMetadata.setText(resultMetadata)
        IDActivityScanTime.setText(timestamp)
    }
}
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XML activity:-

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".QRScan.QRCodeScannerActivity"
    android:background="@color/white">

    <com.budiyev.android.codescanner.CodeScannerView
        android:id="@+id/scanner_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:autoFocusButtonColor="@color/teal_200"
        app:autoFocusButtonVisible="true"
        app:flashButtonColor="@color/ic_launcher_background"
        app:flashButtonVisible="true"
        app:frameAspectRatioHeight="1"
        app:frameAspectRatioWidth="1"
        app:frameColor="@color/ic_launcher_background"
        app:frameCornersRadius="0dp"
        app:frameCornersSize="50dp"
        app:frameSize="0.75"
        app:frameThickness="2dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:maskColor="#77000000" />

<!--    <Button-->
<!--        android:id="@+id/IDviewscanresult"-->
<!--        android:layout_width="wrap_content"-->
<!--        android:layout_height="wrap_content"-->
<!--        android:text="View Result"-->
<!--        app:layout_constraintBottom_toBottomOf="parent"-->
<!--        app:layout_constraintEnd_toEndOf="parent"-->
<!--        app:layout_constraintHorizontal_bias="0.498"-->
<!--        app:layout_constraintStart_toStartOf="parent"-->
<!--        app:layout_constraintTop_toBottomOf="@+id/scanner_view"-->
<!--        app:layout_constraintVertical_bias="0.384"-->
<!--        tools:ignore="MissingConstraints" />-->


</androidx.constraintlayout.widget.ConstraintLayout>

Source

https://androiddvlpr.com/zxing-android-example/