Scan QR Android Kotlin

Scan QR Android Kotlin

1/  Create A New Project .

 main_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:background="@color/white"
    >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:padding="16dp"
        android:layout_centerInParent="true"
        >
        <com.journeyapps.barcodescanner.CompoundBarcodeView
            android:id="@+id/barcode_scanner"
            android:layout_width="match_parent"
            android:layout_height="500dp"
            app:zxing_preview_scaling_strategy="fitXY" />

        <TextView

            android:id="@+id/scanResultTextView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text=""
            android:textSize="16sp"
            android:padding="12dp"
            android:background="@android:drawable/editbox_background"
            android:textColor="@color/black"
            android:textIsSelectable="true"
            android:layout_marginTop="10dp"

            />

    </LinearLayout>

</RelativeLayout>

2/ Add dependencies

implementation ("com.google.zxing:core:3.4.1")
implementation ("com.journeyapps:zxing-android-embedded:4.3.0")

3/MainActivity.kt

package com.scanqrkotlin.scanqrkotlin

import android.os.Bundle
import android.widget.TextView
import androidx.activity.enableEdgeToEdge
import androidx.appcompat.app.AppCompatActivity
import androidx.core.view.ViewCompat
import androidx.core.view.WindowInsetsCompat
import com.google.zxing.ResultPoint
import com.journeyapps.barcodescanner.BarcodeCallback
import com.journeyapps.barcodescanner.BarcodeResult
import com.journeyapps.barcodescanner.CompoundBarcodeView

class MainActivity : AppCompatActivity() {

    lateinit var barcodeScanner:CompoundBarcodeView
    lateinit var scanResultTextView: TextView

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        enableEdgeToEdge()
        setContentView(R.layout.activity_main)
        barcodeScanner=findViewById(R.id.barcode_scanner)
        scanResultTextView=findViewById(R.id.scanResultTextView)

        barcodeScanner.decodeContinuous(object : BarcodeCallback {
            override fun barcodeResult(result: BarcodeResult?) {
                result?.let {
                    scanResultTextView.text = "${it.text}"
                }
            }

            override fun possibleResultPoints(resultPoints: List<ResultPoint>?) {}
        })

    }
    override fun onResume() {
        super.onResume()
        barcodeScanner.resume()
    }

    override fun onPause() {
        super.onPause()
        barcodeScanner.pause()
    }
}