(230319)chatgpt가 알려준 hello world 출력 문 및 ble 연결 방법(웹형태로는 성공했으나, 개인 디바이스에서는 컴파일 실패)

import 'package:flutter/material.dart'; import 'package:flutter_blue/flutter_blue.dart'; void main() { runApp(MaterialApp( home: Scaffold( backgroundColor: Colors.black, body: Center( child: Text( 'Hello World', style: TextStyle( color: Colors.white, fontSize: 20.0, ), ), ), ), )); // BLE 모듈 연결 함수 호출 connectToBLEModule(); } // BLE 모듈의 MAC 주소 const String DEVICE_MAC_ADDRESS = "00:11:22:33:44:55"; // BLE 모듈과 연결하는 함수 Future<void> connectToBLEModule() async { // FlutterBlue 객체 생성 FlutterBlue flutterBlue = FlutterBlue.instance; // BLE 모듈 스캔 시작 flutterBlue.startScan(timeout: Duration(seconds: 4)); // BLE 모듈 스캔 결과 확인 flutterBlue.scanResults.listen((results) { for (ScanResult r in results) { // BLE 모듈을 찾으면 연결 시도 if (r.device.id.toString() == DEVICE_MAC_ADDRESS) { // 연결 시도 r.device.connect(); // 연결 완료까지 대기 r.device.state.listen((event) async { if (event == BluetoothDeviceState.connected) { // 연결된 BLE 모듈 서비스 찾기 List<BluetoothService> services = (await r.device.discoverServices()).toList(); // 연결된 BLE 모듈 서비스 확인 for (BluetoothService service in services) { print("Service UUID: ${service.uuid}"); // 서비스의 특성(Characteristic) 확인 List<BluetoothCharacteristic> characteristics = await service.characteristics.toList(); for (BluetoothCharacteristic c in characteristics) { print("Characteristic UUID: ${c.uuid}"); // 특성(Characteristic)에서 데이터 수신 c.value.listen((value) { print("Received data: ${String.fromCharCodes(value)}"); }); } } } }); } } }); }

def localProperties = new Properties() def localPropertiesFile = rootProject.file('local.properties') if (localPropertiesFile.exists()) { localPropertiesFile.withReader('UTF-8') { reader -> localProperties.load(reader) } } def flutterRoot = localProperties.getProperty('flutter.sdk') if (flutterRoot == null) { throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.") } def flutterVersionCode = localProperties.getProperty('flutter.versionCode') if (flutterVersionCode == null) { flutterVersionCode = '1' } def flutterVersionName = localProperties.getProperty('flutter.versionName') if (flutterVersionName == null) { flutterVersionName = '1.0' } apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle" android { compileSdkVersion flutter.compileSdkVersion ndkVersion flutter.ndkVersion compileOptions { sourceCompatibility JavaVersion.VERSION_1_8 targetCompatibility JavaVersion.VERSION_1_8 } kotlinOptions { jvmTarget = '1.8' } sourceSets { main.java.srcDirs += 'src/main/kotlin' } defaultConfig { //230318_2243 : 새로 작성한 부분 // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). applicationId "com.example.hello_world" // You can update the following values to match your application needs. // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration. minSdkVersion 19 // 수정된 부분 targetSdkVersion flutter.targetSdkVersion versionCode flutterVersionCode.toInteger() versionName flutterVersionName } /*defaultConfig { //230318_2243 : 원래 있던 부분 // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html). applicationId "com.example.hello_world" // You can update the following values to match your application needs. // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration. minSdkVersion flutter.minSdkVersion targetSdkVersion flutter.targetSdkVersion versionCode flutterVersionCode.toInteger() versionName flutterVersionName }*/ buildTypes { release { // TODO: Add your own signing config for the release build. // Signing with the debug keys for now, so `flutter run --release` works. signingConfig signingConfigs.debug } } } flutter { source '../..' } dependencies { implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version" }

buildscript { ext.kotlin_version = '1.7.10' repositories { google() mavenCentral() } dependencies { classpath 'com.android.tools.build:gradle:7.2.0' classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" } } allprojects { repositories { google() mavenCentral() } } rootProject.buildDir = '../build' subprojects { project.buildDir = "${rootProject.buildDir}/${project.name}" } subprojects { project.evaluationDependsOn(':app') } task clean(type: Delete) { delete rootProject.buildDir }

name: hello_world description: A new Flutter project. # The following line prevents the package from being accidentally published to # pub.dev using `flutter pub publish`. This is preferred for private packages. publish_to: 'none' # Remove this line if you wish to publish to pub.dev # The following defines the version and build number for your application. # A version number is three numbers separated by dots, like 1.2.43 # followed by an optional build number separated by a +. # Both the version and the builder number may be overridden in flutter # build by specifying --build-name and --build-number, respectively. # In Android, build-name is used as versionName while build-number used as versionCode. # Read more about Android versioning at https://developer.android.com/studio/publish/versioning # In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion. # Read more about iOS versioning at # 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: 1.0.0+1 environment: sdk: '>=2.19.1 <3.0.0' # Dependencies specify other packages that your package needs in order to work. # To automatically upgrade your package dependencies to the latest versions # consider running `flutter pub upgrade --major-versions`. Alternatively, # dependencies can be manually updated by changing the version numbers below to # the latest version available on pub.dev. To see which dependencies have newer # versions available, run `flutter pub outdated`. dependencies: flutter: sdk: flutter flutter_blue: ^0.8.0 #230318_2242 플러터 ble 모듈 # The following adds the Cupertino Icons font to your application. # Use with the CupertinoIcons class for iOS style icons. cupertino_icons: ^1.0.2 dev_dependencies: flutter_test: sdk: flutter # The "flutter_lints" package below contains a set of recommended lints to # encourage good coding practices. The lint set provided by the package is # activated in the `analysis_options.yaml` file located at the root of your # package. See that file for information about deactivating specific lint # rules and activating additional ones. flutter_lints: ^2.0.0 # For information on the generic Dart part of this file, see the # following page: https://dart.dev/tools/pub/pubspec # The following section is specific to Flutter packages. flutter: # The following line ensures that the Material Icons font is # included with your application, so that you can use the icons in # the material Icons class. uses-material-design: true # To add assets to your application, add an assets section, like this: # assets: # - images/a_dot_burr.jpeg # - images/a_dot_ham.jpeg # An image asset can refer to one or more resolution-specific "variants", see # https://flutter.dev/assets-and-images/#resolution-aware # For details regarding adding assets from package dependencies, see # https://flutter.dev/assets-and-images/#from-packages # To add custom fonts to your application, add a fonts section here, # in this "flutter" section. Each entry in this list should have a # "family" key with the font family name, and a "fonts" key with a # list giving the asset and other descriptors for the font. For # example: # fonts: # - family: Schyler # fonts: # - asset: fonts/Schyler-Regular.ttf # - asset: fonts/Schyler-Italic.ttf # style: italic # - family: Trajan Pro # fonts: # - asset: fonts/TrajanPro.ttf # - asset: fonts/TrajanPro_Bold.ttf # weight: 700 # # For details regarding fonts from package dependencies, # see https://flutter.dev/custom-fonts/#from-packages

Launching lib/main.dart on SM G998N in debug mode... Running Gradle task 'assembleDebug'... /Users/glory/Desktop/mac/flutter_glory/android/app/src/debug/AndroidManifest.xml Error: uses-sdk:minSdkVersion 16 cannot be smaller than version 19 declared in library [:flutter_blue] /Users/glory/Desktop/mac/flutter_glory/build/flutter_blue/intermediates/merged_manifest/debug/AndroidManifest.xml as the library might be using APIs not available in 16 Suggestion: use a compatible library with a minSdk of at most 16, or increase this project's minSdk version to at least 19, or use tools:overrideLibrary="com.pauldemarco.flutter_blue" to force usage (may lead to runtime failures) FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:processDebugMainManifest'. > Manifest merger failed : uses-sdk:minSdkVersion 16 cannot be smaller than version 19 declared in library [:flutter_blue] /Users/glory/Desktop/mac/flutter_glory/build/flutter_blue/intermediates/merged_manifest/debug/AndroidManifest.xml as the library might be using APIs not available in 16 Suggestion: use a compatible library with a minSdk of at most 16, or increase this project's minSdk version to at least 19, or use tools:overrideLibrary="com.pauldemarco.flutter_blue" to force usage (may lead to runtime failures) * Try: > Run with --stacktrace option to get the stack trace. > Run with --info or --debug option to get more log output. > Run with --scan to get full insights. * Get more help at https://help.gradle.org BUILD FAILED in 1m 56s ┌─ Flutter Fix ─────────────────────────────────────────────────────────────────────────────────┐ │ The plugin flutter_blue requires a higher Android SDK version. │ │ Fix this issue by adding the following to the file │ │ /Users/glory/Desktop/mac/flutter_glory/android/app/build.gradle: │ │ android { │ │ defaultConfig { │ │ minSdkVersion 19 │ │ } │ │ } │ │ │ │ Note that your app won't be available to users running Android SDKs below 19. │ │ Alternatively, try to find a version of this plugin that supports these lower versions of the │ │ Android SDK. │ │ For more information, see: │ │ https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration │ └───────────────────────────────────────────────────────────────────────────────────────────────┘ Exception: Gradle task assembleDebug failed with exit code 1

markdownCopy code android { ... defaultConfig { ... minSdkVersion 19 ... } }

scssCopy code repositories { google() ... }