Question

首先，我很抱歉没有以英语为母语。

但是我遇到的问题如下。

1）我正在按照教程（Youtube /文档）在Flutter中实施通知。

2）按照文档的指示，我进行了所有建议的设置。它们如下：

在控制台Flutter中生成google-services.json文件
将应用插件：“ com.google.gms.google-services”添加到app文件夹中的build.gradle
在build.gradle中将类路径'com.google.gms：google-services：4.2.0'添加到android文件夹的根目录
将意图过滤器（FLUTTER_NOTIFICATION_CLICK）添加到AndroidManifest.xml文件

这是android文件夹的build.gradle。

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.2.1'        
        classpath 'com.google.gms:google-services:3.2.0'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

subprojects {
    project.configurations.all {
        resolutionStrategy.eachDependency { details ->
            if (details.requested.group == 'com.android.support'
                    && !details.requested.name.contains('multidex') ) {
                details.useVersion "26.1.0"
            }
        }
    }
}

这是app文件夹的build.gradle。

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 from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 27

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.tccversao2"
        minSdkVersion 16
        targetSdkVersion 27
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }

    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 {
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}
android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

apply plugin: 'com.google.gms.google-services'

这是我的代码

@immutable
class Message {
  final String title;
  final String body;

  const Message({
    @required this.title,
    @required this.body,
  });
}

class MessagingWidget extends StatefulWidget {
  @override
  _MessagingWidgetState createState() => _MessagingWidgetState();
}

class _MessagingWidgetState extends State<MessagingWidget> {
  final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
  final List<Message> messages = [];

  @override
  void initState() {
    super.initState();
    _firebaseMessaging.configure(
      onMessage: (Map<String, dynamic> message) async {
        print("onMessage: $message");
        final notification = message['notification'];
        setState(() {
          messages.add(Message(
              title: notification['title'], body: notification['body']));
        });
      },
      onLaunch: (Map<String, dynamic> message) async {
        print("onLaunch: $message");

        final notification = message['data'];
        setState(() {
          messages.add(Message(
            title: '${notification['title']}',
            body: '${notification['body']}',
          ));
        });
      },
      onResume: (Map<String, dynamic> message) async {
        print("onResume: $message");
      },
    );
    _firebaseMessaging.requestNotificationPermissions(
        const IosNotificationSettings(sound: true, badge: true, alert: true));
  }

  @override
  Widget build(BuildContext context) => ListView(
        children: messages.map(buildMessage).toList(),
      );

  Widget buildMessage(Message message) => ListTile(
        title: Text(message.title),
        subtitle: Text(message.body),
      );
}

我正在使用图书馆 firebase_messaging：^ 4.0.0 + 1 firebase_core：^ 0.3.0

我收到以下错误消息：

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:preDebugBuild'.
> Android dependency 'com.android.support:support-fragment' has different version for the compile (26.1.0) and runtime (27.1.1) classpath. You should manually set the same version via DependencyResolution

* 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 6s
Gradle task assembleDebug failed with exit code 1

我已经尝试在build.gradle（在android文件夹中）中使用类路径'com.google.gms：google-services：4.3.0'，但是在这种情况下，我遇到了另一个错误，即：

* Error running Gradle:
ProcessException: Process "E:\Flutter\projetos\tcc_versao2\tcc_versao2\android\gradlew.bat" exited abnormally:

FAILURE: Build failed with an exception.

* Where:
Build file 'E:\Flutter\projetos\tcc_versao2\tcc_versao2\android\app\build.gradle' line: 24

* What went wrong:
A problem occurred evaluating project ':app'.
> ASCII

* 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 3s
  Command: E:\Flutter\projetos\tcc_versao2\tcc_versao2\android\gradlew.bat app:properties

Please review your Gradle project setup in the android/ folder.

*也许重要的是要说：我正在用手机调试（小米Note 3 pro）

我对这个错误完全迷失了，如果有人可以帮助我，我将非常高兴。

Answer 1

您应该看一下正在使用的库。

该错误表明它为com.android.support:support-fragment找到了两个不同的版本。打开您的android / build.gradle并检查此处是否存在该依赖项，并将其更新为版本27.1.1。

如果您没有直接在应用程序中找到依赖项，则它可能来自另一个过时的依赖项或Flutter插件。还要在pubspec.yaml上验证所有插件依赖项的更新。

实施Firebase（Flutter）通知时，出现错误

1 个答案: