🔀 :: getDefaultAdapter returns null 에러 해결하기 #206

android/app/build.gradle

@@ -13,7 +13,7 @@ if (flutterRoot == null) {
 
 def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
 if (flutterVersionCode == null) {
-    flutterVersionCode = '18'
+    flutterVersionCode = '20'
 }
 
 def flutterVersionName = localProperties.getProperty('flutter.versionName')
@@ -56,7 +56,7 @@ android {
         applicationId "com.osj.lotura"
         // You can update the following values to match your application needs.
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
-        minSdkVersion 21
+        minSdkVersion 23
         targetSdkVersion flutter.targetSdkVersion
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
@@ -88,3 +88,75 @@ flutter {
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 }
+
+//3.16 이상부터 바뀌는걸 ^권장^ 하는 옵션
+//plugins {
+//    id("com.android.application")
+//    id("kotlin-android")
+//    id("dev.flutter.flutter-gradle-plugin")
+//    id("com.google.gms.google-services")
+//}
+//
+//def localProperties = new Properties()
+//def localPropertiesFile = rootProject.file('local.properties')
+//if (localPropertiesFile.exists()) {
+//    localPropertiesFile.withReader('UTF-8') { reader ->
+//        localProperties.load(reader)
+//    }
+//}
+//
+//def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+//if (flutterVersionCode == null) {
+//    flutterVersionCode = '19'
+//}
+//
+//def flutterVersionName = localProperties.getProperty('flutter.versionName')
+//if (flutterVersionName == null) {
+//    flutterVersionName = '3.3.6'
+//}
+//
+//android {
+//    namespace "com.osj.lotura"
+//    compileSdk flutter.compileSdkVersion
+//    ndkVersion flutter.ndkVersion
+//
+//    compileOptions {
+//        sourceCompatibility JavaVersion.VERSION_1_8
+//        targetCompatibility JavaVersion.VERSION_1_8
+//    }
+//
+//    kotlinOptions {
+//        jvmTarget = '1.8'
+//    }
+//
+//    sourceSets {
+//        main.java.srcDirs += 'src/main/kotlin'
+//    }
+//
+//    defaultConfig {
+//        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+//        applicationId "com.osj.lotura"
+//        // You can update the following values to match your application needs.
+//        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
+//        minSdkVersion 23
+//        targetSdkVersion flutter.targetSdkVersion
+//        versionCode flutterVersionCode.toInteger()
+//        versionName flutterVersionName
+//    }
+//
+//    buildTypes {
+//        release {
+//            // TODO: Add your own signing config for the release build.
+//            // Signing with the debug keys for now, so `flutter run --release` works.
+//            signingConfig signingConfigs.debug
+//        }
+//    }
+//}
+//
+//flutter {
+//    source '../..'
+//}
+//
+//dependencies {
+//    implementation platform('com.google.firebase:firebase-bom:32.7.4')
+//}

android/app/src/main/kotlin/com/osj/lotura/MainActivity.kt

@@ -12,19 +12,20 @@ import io.flutter.embedding.engine.FlutterEngine
 import io.flutter.plugin.common.MethodChannel
 
 class MainActivity : FlutterActivity() {
-    private lateinit var nfcAdapter: NfcAdapter
+    private var nfcAdapter: NfcAdapter? = null
     private var returnData = -1
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         nfcAdapter = NfcAdapter.getDefaultAdapter(this)
+        if (nfcAdapter != null) {
+            if (intent.action == NfcAdapter.ACTION_NDEF_DISCOVERED) {
+                val data = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES)
+                val message = data?.get(0) as NdefMessage
+                val record = message.records[0] as NdefRecord
+                val byteArr = record.payload
 
-        if (intent.action == NfcAdapter.ACTION_NDEF_DISCOVERED) {
-            val data = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES)
-            val message = data?.get(0) as NdefMessage
-            val record = message.records[0] as NdefRecord
-            val byteArr = record.payload
-
-            returnData = String(byteArr).toInt()
+                returnData = String(byteArr).toInt()
+            }
         }
     }
 
@@ -41,7 +42,7 @@ class MainActivity : FlutterActivity() {
                 }
 
                 "nfcIsAvailable" -> {
-                    result.success(nfcAdapter.isEnabled)
+                    result.success(nfcAdapter?.isEnabled)
                 }
             }
         }
@@ -77,10 +78,10 @@ class MainActivity : FlutterActivity() {
         val intentFilters = arrayOf(
             IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED),
         )
-        nfcAdapter.enableForegroundDispatch(this, pendingIntent, intentFilters, null)
+        nfcAdapter?.enableForegroundDispatch(this, pendingIntent, intentFilters, null)
     }
 
     private fun disableNfcForegroundDispatch() {
-        nfcAdapter.disableForegroundDispatch(this)
+        nfcAdapter?.disableForegroundDispatch(this)
     }
 }

android/build.gradle

@@ -32,3 +32,23 @@ subprojects {
 tasks.register("clean", Delete) {
     delete rootProject.buildDir
 }
+
+//3.16 이상부터 바뀌는걸 ^권장^ 하는 옵션
+//allprojects {
+//    repositories {
+//        google()
+//        mavenCentral()
+//    }
+//}
+//
+//rootProject.buildDir = '../build'
+//subprojects {
+//    project.buildDir = "${rootProject.buildDir}/${project.name}"
+//}
+//subprojects {
+//    project.evaluationDependsOn(':app')
+//}
+//
+//tasks.register("clean", Delete) {
+//    delete rootProject.buildDir
+//}

android/settings.gradle

@@ -9,3 +9,31 @@ localPropertiesFile.withReader("UTF-8") { reader -> properties.load(reader) }
 def flutterSdkPath = properties.getProperty("flutter.sdk")
 assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
 apply from: "$flutterSdkPath/packages/flutter_tools/gradle/app_plugin_loader.gradle"
+//3.16 이상부터 바뀌는걸 ^권장^ 하는 옵션
+//pluginManagement {
+//    def flutterSdkPath = {
+//        def properties = new Properties()
+//        file("local.properties").withInputStream { properties.load(it) }
+//        def flutterSdkPath = properties.getProperty("flutter.sdk")
+//        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+//        return flutterSdkPath
+//    }
+//    settings.ext.flutterSdkPath = flutterSdkPath()
+//
+//    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")
+//
+//    repositories {
+//        google()
+//        mavenCentral()
+//        gradlePluginPortal()
+//    }
+//}
+//
+//plugins {
+//    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+//    id "com.android.application" version "7.3.0" apply false
+//    id "org.jetbrains.kotlin.android" version "1.7.10" apply false
+//    id "com.google.gms.google-services" version "4.3.14" apply false
+//}
+//
+//include ":app"

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 3.3.6+18
+version: 3.3.6+20
 
 environment:
   sdk: '>=3.1.3 <4.0.0'