Barcode Scanning in Android using Kotlin?

This example demonstrates how to implement bar code scanning in Kotlin.

Step 1 − Create a new project in Android Studio, go to File? New Project and fill all required details to create a new project.

Step 2 − Add the following code to res/layout/activity_main.xml.

Example

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/relativeLayout"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:padding="4dp"    tools:context=".MainActivity">    <TextView       android:id="@+id/textView"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_centerHorizontal="true"       android:layout_marginTop="50dp"       android:padding="8dp"       android:text="Tutorials Point"       android:textColor="@android:color/holo_green_dark"       android:textSize="48sp"       android:textStyle="bold" />    <TextView       android:id="@+id/txtContent"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_below="@id/button"       android:layout_centerInParent="true"       android:layout_marginBottom="10dp"       android:text=" code reader"       android:textSize="16sp"       android:textStyle="bold" />    <Button       android:id="@+id/button"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_centerInParent="true"       android:layout_marginTop="50dp"       android:text="Process" /> </RelativeLayout>

Step 3 − Add the following the dependency to build.gradle (Module:app)

implementation 'com.google.zxing:core:3.3.3' implementation 'com.journeyapps:zxing-android-embedded:3.2.0@aar'

Step 4 − Add the following code to src/MainActivity.kt

Example

import android.content.Intent import android.os.Bundle import android.util.Log import android.widget.Button import android.widget.TextView import android.widget.Toast import androidx.appcompat.app.AppCompatActivity import com.google.zxing.integration.android.IntentIntegrator class MainActivity : AppCompatActivity() {    lateinit var btnBarcode: Button    lateinit var textView: TextView    override fun onCreate(savedInstanceState: Bundle?) {       super.onCreate(savedInstanceState)       setContentView(R.layout.activity_main)       title = "KotlinApp"       btnBarcode = findViewById(R.id.button)       textView = findViewById(R.id.txtContent)       btnBarcode.setOnClickListener {          val intentIntegrator = IntentIntegrator(this@MainActivity)          intentIntegrator.setBeepEnabled(false)          intentIntegrator.setCameraId(0)          intentIntegrator.setPrompt("SCAN")          intentIntegrator.setBarcodeImageEnabled(false)          intentIntegrator.initiateScan()       }    }    override fun onActivityResult(       requestCode: Int,       resultCode: Int,       data: Intent?    ) {       val result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data)       if (result != null) {          if (result.contents == null) {             Toast.makeText(this, "cancelled", Toast.LENGTH_SHORT).show()          } else {             Log.d("MainActivity", "Scanned")             Toast.makeText(this, "Scanned -> " + result.contents, Toast.LENGTH_SHORT)             .show()             textView.text = String.format("Scanned Result: %s", result)          }       } else {          super.onActivityResult(requestCode, resultCode, data)       }    } }

Step 5 − Add the following code to androidManifest.xml

Example

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.q12"> <uses-feature android:name="android.hardware.camera.autoFocus" /> <uses-feature android:name="android.hardware.camera" /> <uses-permission android:name="android.permission.CAMERA" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />    <application       android:allowBackup="true"       android:icon="@mipmap/ic_launcher"       android:label="@string/app_name"       android:roundIcon="@mipmap/ic_launcher_round"       android:supportsRtl="true"       android:theme="@style/AppTheme">       <activity android:name=".MainActivity">          <intent-filter>             <action android:name="android.intent.action.MAIN" />             <category android:name="android.intent.category.LAUNCHER" />          </intent-filter>       </activity>    </application> </manifest>

Let's try to run your application. I assume you have connected your actual Android Mobile device with your computer. To run the app from android studio, open one of your project's activity files and click the Run icon from the toolbar. Select your mobile device as an option and then check your mobile device which will display your default screen