早上好，我尝试制作一个带有android和ios通知的简易天气应用程序，为此，我们使用基础flutter应用程序和库flutter_local_notifications: ^0.5.1+2和location: ^2.0.0，但同时使用它们会出现错误：
Launching lib\main.dart on SM A520F in debug mode...
Initializing gradle...
Resolving dependencies...
Gradle task 'assembleDebug'...
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:preDebugBuild'.
> Android dependency 'androidx.core:core' has different version for the compile (1.0.0-rc01) and runtime (1.0.1) 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 2s
Finished with error: Gradle task assembleDebug failed with exit code 1
Flutter Doctor输出：
C:\src\flutter\bin\flutter.bat doctor --verbose
[√] Flutter (Channel stable, v1.0.0, on Microsoft Windows [Version 10.0.17134.590], locale ru-RU)
• Flutter version 1.0.0 at C:\src\flutter
• Framework revision 5391447fae (3 months ago), 2018-11-29 19:41:26 -0800
• Engine revision 7375a0f414
• Dart version 2.1.0 (build 2.1.0-dev.9.4 f9ebf21297)
[√] Android toolchain - develop for Android devices (Android SDK 28.0.3)
• Android SDK at C:\Users\zande\AppData\Local\Android\sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-28, build-tools 28.0.3
• Java binary at: C:\Program Files\Android\Android Studio\jre\bin\java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)
• All Android licenses accepted.
[√] Android Studio (version 3.3)
• Android Studio at C:\Program Files\Android\Android Studio
• Flutter plugin version 32.0.1
• Dart plugin version 182.5124
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)
[!] VS Code (version 1.31.0)
• VS Code at C:\Users\zande\AppData\Local\Programs\Microsoft VS Code
• Flutter extension not installed; install from
https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter
[√] Connected device (1 available)
• SM A520F • 5200291746c1b485 • android-arm64 • Android 8.0.0 (API 26) (emulator)
! Doctor found issues in 1 category.
Process finished with exit code 0
我的pubspec.yaml：
name: flutter_app
description: A new Flutter application.
# 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.
# Read more about versioning at semver.org.
version: 1.0.0+1
environment:
sdk: ">=2.0.0-dev.68.0 <3.0.0"
dependencies:
flutter:
sdk: flutter
# The following adds the Cupertino Icons font to your application.
# Use with the CupertinoIcons class for iOS style icons.
cupertino_icons: ^0.1.2
flutter_local_notifications: ^0.5.1+2
location: ^2.0.0
dev_dependencies:
flutter_test:
sdk: flutter
# For information on the generic Dart part of this file, see the
# following page: https://www.dartlang.org/tools/pub/pubspec
# The following section is specific to Flutter.
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.io/assets-and-images/#resolution-aware.
# For details regarding adding assets from package dependencies, see
# https://flutter.io/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.io/custom-fonts/#from-packages
我的main.dart：
import 'dart:async';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:location/location.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
// This is the theme of your application.
//
// Try running your application with "flutter run". You'll see the
// application has a blue toolbar. Then, without quitting the app, try
// changing the primarySwatch below to Colors.green and then invoke
// "hot reload" (press "r" in the console where you ran "flutter run",
// or simply save your changes to "hot reload" in a Flutter IDE).
// Notice that the counter didn't reset back to zero; the application
// is not restarted.
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
// This widget is the home page of your application. It is stateful, meaning
// that it has a State object (defined below) that contains fields that affect
// how it looks.
// This class is the configuration for the state. It holds the values (in this
// case the title) provided by the parent (in this case the App widget) and
// used by the build method of the State. Fields in a Widget subclass are
// always marked "final".
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
// This call to setState tells the Flutter framework that something has
// changed in this State, which causes it to rerun the build method below
// so that the display can reflect the updated values. If we changed
// _counter without calling setState(), then the build method would not be
// called again, and so nothing would appear to happen.
_counter++;
});
}
@override
Widget build(BuildContext context) {
// This method is rerun every time setState is called, for instance as done
// by the _incrementCounter method above.
//
// The Flutter framework has been optimized to make rerunning build methods
// fast, so that you can just rebuild anything that needs updating rather
// than having to individually change instances of widgets.
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text(widget.title),
),
body: Center(
// Center is a layout widget. It takes a single child and positions it
// in the middle of the parent.
child: Column(
// Column is also layout widget. It takes a list of children and
// arranges them vertically. By default, it sizes itself to fit its
// children horizontally, and tries to be as tall as its parent.
//
// Invoke "debug painting" (press "p" in the console, choose the
// "Toggle Debug Paint" action from the Flutter Inspector in Android
// Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
// to see the wireframe for each widget.
//
// Column has various properties to control how it sizes itself and
// how it positions its children. Here we use mainAxisAlignment to
// center the children vertically; the main axis here is the vertical
// axis because Columns are vertical (the cross axis would be
// horizontal).
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.display1,
),
RaisedButton(
onPressed: () {
setState(() {
_counter = 0;
});
},
child: Text('to 0')),
new Padding(
padding: new EdgeInsets.fromLTRB(0.0, 0.0, 0.0, 8.0),
child: new Text(
'Tap on a notification when it appears to trigger navigation'),
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
), // This trailing comma makes auto-formatting nicer for build methods.
);
}
Future onSelectNotification(String payload) async {
showDialog(
context: context,
builder: (_) {
return new AlertDialog(
title: Text("PayLoad"),
content: Text("Payload : $payload"),
);
},
);
}
}
我的build.gradle文件：
def localProperties = new Properties()
def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
localPropertiesFile.withReader('UTF-8') { reader ->
localProperties.load(reader)
}
}
def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}
def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
flutterVersionCode = '1'
}
def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
flutterVersionName = '1.0'
}
apply plugin: 'com.android.application'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"
android {
compileSdkVersion 28
lintOptions {
disable 'InvalidPackage'
}
defaultConfig {
// TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
applicationId "com.example.flutterapp"
minSdkVersion 16
targetSdkVersion 28
versionCode flutterVersionCode.toInteger()
versionName flutterVersionName
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
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'
}
我尝试使用其他地理位置库，但经常出现类似错误
D8: Program type already present: android.support.v4.os.ResultReceiver$MyResultReceiver
或WARNING: This version of device_info will break your Android build if it or its dependencies aren't compatible with AndroidX.
我应该做些什么来制作我的天气应用程序？
答案 0 :(得分：4)
开个玩笑，我最近遇到了同样的问题（并且我对AndroidX的各种依赖项（以-rc01版本结尾）表示了很多抱怨，并且强制解决策略的各种解决方案都无法正常工作。
我通过升级android / build.gradle文件中的gradle依赖关系来解决它：classpath'com.android.tools.build:gradle:3.3.1'（我以前使用的是3.2.1版）
答案 1 :(得分：3)
我遇到了来自androidX兼容性的相同问题。错误消息如下：
android dependency 'androidx.core:core' has different version for the compile (1.0.0) and runtime (1.0.1) classpath
我如下修复（如果相同，则忽略它）：
distributionUrl = https：//services.gradle.org/distributions/gradle-4.10.2-all.zip
依赖项{ classpath'com.android.tools.build:gradle:3.3.0'}
ext.kotlin_version ='1.3.0'
android.enableJetifier = true
android.useAndroidX = true
在android {下，请确保compileSdkVersion和targetSdkVersion至少为28。
...
testInstrumentationRunner“ androidx.test.runner.AndroidJUnitRunner”
在依赖项下{
androidTestImplementation'androidx.test：runner：1.1.1'
androidTestImplementation'androidx.test.espresso：espresso-core：3.1.1'
实现'com.android.support:multidex:1.0.3'
在defaultConfig {
下multiDexEnabled是
希望这会有所帮助！