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>
[data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%2730%27%20height=%2730%27/%3e](data:image/svg+xml,%3csvg%20xmlns=%27http://www.w3.org/2000/svg%27%20version=%271.1%27%20width=%2730%27%20height=%2730%27/%3e)
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
tools:overrideLibrary="com.pauldemarco.flutter_blue" 속성을 추가합니다. 이 방법은 런타임 오류가 발생할 가능성이 있으므로 주의해야 합니다./Users/glory/Desktop/mac/flutter_glory/android/app/build.gradle 파일을 열고, 다음과 같이 defaultConfig 블록에 minSdkVersion 값을 19로 변경하면 됩니다.markdownCopy code
android {
...
defaultConfig {
...
minSdkVersion 19
...
}
}