See this video for details: https://www.youtube.com/watch?v=UKU9WizT7Bw
build.gradle.kts(Project)
// Top-level build file where you can add configuration options common to all sub-projects/modules.
plugins {
alias(libs.plugins.android.application) apply false
alias(libs.plugins.jetbrains.kotlin.android) apply false
}build.gradle.kts(app)
plugins {
alias(libs.plugins.android.application)
alias(libs.plugins.jetbrains.kotlin.android)
}
android {
namespace = "com.example.qrscanapplication"
compileSdk = 34
defaultConfig {
applicationId = "com.example.qrscanapplication"
minSdk = 24
targetSdk = 34
versionCode = 1
versionName = "1.0"
testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
vectorDrawables {
useSupportLibrary = true
}
}
buildTypes {
release {
isMinifyEnabled = false
proguardFiles(
getDefaultProguardFile("proguard-android-optimize.txt"),
"proguard-rules.pro"
)
}
}
compileOptions {
sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = "1.8"
}
buildFeatures {
compose = true
}
composeOptions {
kotlinCompilerExtensionVersion = "1.5.1"
}
packaging {
resources {
excludes += "/META-INF/{AL2.0,LGPL2.1}"
}
}
}
dependencies {
implementation(libs.androidx.core.ktx)
implementation(libs.androidx.lifecycle.runtime.ktx)
implementation(libs.androidx.activity.compose)
implementation(platform(libs.androidx.compose.bom))
implementation(libs.androidx.ui)
implementation(libs.androidx.ui.graphics)
implementation(libs.androidx.ui.tooling.preview)
implementation(libs.androidx.material3)
testImplementation(libs.junit)
androidTestImplementation(libs.androidx.junit)
androidTestImplementation(libs.androidx.espresso.core)
androidTestImplementation(platform(libs.androidx.compose.bom))
androidTestImplementation(libs.androidx.ui.test.junit4)
debugImplementation(libs.androidx.ui.tooling)
debugImplementation(libs.androidx.ui.test.manifest)
implementation("com.journeyapps:zxing-android-embedded:4.3.0")
implementation("com.google.zxing:core:3.4.1")
}settings.gradle.kts
pluginManagement {
repositories {
google {
content {
includeGroupByRegex("com\\.android.*")
includeGroupByRegex("com\\.google.*")
includeGroupByRegex("androidx.*")
}
}
mavenCentral()
gradlePluginPortal()
}
}
dependencyResolutionManagement {
repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
repositories {
google()
mavenCentral()
}
}
rootProject.name = "QRScanApplication"
include(":app")libs.versions.toml
[versions]
agp = "8.4.1"
kotlin = "1.9.0"
coreKtx = "1.13.1"
junit = "4.13.2"
junitVersion = "1.1.5"
espressoCore = "3.5.1"
lifecycleRuntimeKtx = "2.8.1"
activityCompose = "1.9.0"
composeBom = "2023.08.00"
composeUi = "1.5.1" # Add a suitable version for Compose UI
material3 = "1.0.0-alpha03"
[libraries]
androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
junit = { group = "junit", name = "junit", version.ref = "junit" }
androidx-junit = { group = "androidx.test.ext", name = "junit", version.ref = "junitVersion" }
androidx-espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espressoCore" }
androidx-lifecycle-runtime-ktx = { group = "androidx.lifecycle", name = "lifecycle-runtime-ktx", version.ref = "lifecycleRuntimeKtx" }
androidx-activity-compose = { group = "androidx.activity", name = "activity-compose", version.ref = "activityCompose" }
androidx-compose-bom = { group = "androidx.compose", name = "compose-bom", version.ref = "composeBom" }
androidx-ui = { group = "androidx.compose.ui", name = "ui", version.ref = "composeUi" }
androidx-ui-graphics = { group = "androidx.compose.ui", name = "ui-graphics", version.ref = "composeUi" }
androidx-ui-tooling = { group = "androidx.compose.ui", name = "ui-tooling", version.ref = "composeUi" }
androidx-ui-tooling-preview = { group = "androidx.compose.ui", name = "ui-tooling-preview", version.ref = "composeUi" }
androidx-ui-test-manifest = { group = "androidx.compose.ui", name = "ui-test-manifest", version.ref = "composeUi" }
androidx-ui-test-junit4 = { group = "androidx.compose.ui", name = "ui-test-junit4", version.ref = "composeUi" }
androidx-material3 = { group = "androidx.compose.material3", name = "material3", version.ref = "material3" }
[plugins]
android-application = { id = "com.android.application", version.ref = "agp" }
jetbrains-kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }MainActivity.kt
package com.example.qrscanapplication
import android.content.Context
import android.content.pm.PackageManager
import android.os.Bundle
import android.widget.Toast
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.result.contract.ActivityResultContracts
import androidx.compose.foundation.Image
import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.layout.size
import androidx.compose.material3.*
import androidx.compose.runtime.Composable
import androidx.compose.runtime.mutableStateOf
import androidx.compose.runtime.remember
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.painterResource
import androidx.compose.ui.text.font.FontWeight
import androidx.compose.ui.tooling.preview.Preview
import androidx.compose.ui.unit.dp
import androidx.compose.ui.unit.sp
import androidx.core.content.ContextCompat
import com.example.qrscanapplication.ui.theme.QRScanApplicationTheme
import com.journeyapps.barcodescanner.ScanContract
import com.journeyapps.barcodescanner.ScanOptions
class MainActivity : ComponentActivity() {
private val textResult = mutableStateOf("")
private val barCodeLauncher = registerForActivityResult(ScanContract()) { result ->
if (result.contents == null) {
Toast.makeText(this@MainActivity, "Cancelled", Toast.LENGTH_SHORT).show()
} else {
textResult.value = result.contents
}
}
private fun showCamera() {
val options = ScanOptions()
options.setDesiredBarcodeFormats(ScanOptions.QR_CODE)
options.setPrompt("Scan a QR code")
options.setCameraId(0)
options.setBeepEnabled(false)
options.setOrientationLocked(false)
barCodeLauncher.launch(options)
}
private val requestPermissionLauncher = registerForActivityResult(
ActivityResultContracts.RequestPermission()
) { isGranted: Boolean ->
if (isGranted) {
showCamera()
} else {
Toast.makeText(this@MainActivity, "Camera permission denied", Toast.LENGTH_SHORT).show()
}
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContent {
QRScanApplicationTheme {
Scaffold(
bottomBar = {
BottomAppBar {
Text("BottomAppBar Content")
}
},
floatingActionButton = {
FloatingActionButton(onClick = { checkCameraPermission(this@MainActivity) }) {
Icon(painter = painterResource(id = R.drawable.qr_scan), contentDescription = "QR Scan")
}
}
) { innerPadding ->
Column(
modifier = Modifier
.fillMaxSize()
.padding(innerPadding),
verticalArrangement = Arrangement.Center,
horizontalAlignment = Alignment.CenterHorizontally
) {
Image(
painter = painterResource(id = R.drawable.qr_scan),
modifier = Modifier.size(100.dp),
contentDescription = "QR Scan"
)
Text(
text = textResult.value,
fontSize = 30.sp,
fontWeight = FontWeight.Bold
)
}
}
}
}
}
private fun checkCameraPermission(context: Context) {
if (ContextCompat.checkSelfPermission(
context,
android.Manifest.permission.CAMERA
) == PackageManager.PERMISSION_GRANTED
) {
showCamera()
} else if (shouldShowRequestPermissionRationale(android.Manifest.permission.CAMERA)) {
Toast.makeText(this@MainActivity, "Camera required", Toast.LENGTH_SHORT).show()
} else {
requestPermissionLauncher.launch(android.Manifest.permission.CAMERA)
}
}
}
@Composable
fun Greeting(name: String, modifier: Modifier = Modifier) {
Text(
text = "Hello $name!",
modifier = modifier
)
}
@Preview(showBackground = true)
@Composable
fun GreetingPreview() {
QRScanApplicationTheme {
Greeting("Android")
}
}AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">
<application
android:allowBackup="true"
android:dataExtractionRules="@xml/data_extraction_rules"
android:fullBackupContent="@xml/backup_rules"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.QRScanApplication"
tools:targetApi="31">
<activity
android:name=".MainActivity"
android:exported="true"
android:label="@string/app_name"
android:theme="@style/Theme.QRScanApplication">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name="com.journeyapps.barcodescanner.CaptureActivity"
android:screenOrientation="fullSensor"
tools:replace="android:screenOrientation"
/>
</application>
</manifest>
Here's a sample QR code image. You can scan it to visit the link https://www.example.com.
Here is a more complex QR code image. It contains a longer URL with multiple parameters, making it more intricate