Android Studio编译Flutter项目选择iOS模拟器运行ok，选择安卓模拟器编译运行的时比如这里我选择Huawei P30 Pro可能会出现一些问题。
问题1：
编译的时候可能会一直显示
Launching lib/main.dart on Huawei P30 Pro in debug mode...
Running Gradle task 'assembleDebug'...
或者
FAILURE: Build failed with an exception.
* What went wrong:
A problem occurred configuring root project 'android'.
> Could not resolve all artifacts for configuration ':classpath'.
> Could not resolve com.android.tools.build:gradle:3.5.0.
Required by:
project :
> Could not resolve com.android.tools.build:gradle:3.5.0.
> Could not get resource 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.5.0/gradle-3.5.0.pom'.
> Could not HEAD 'https://dl.google.com/dl/android/maven2/com/android/tools/build/gradle/3.5.0/gradle-3.5.0.pom'.
> Connection reset
* 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 10s
Exception: Gradle task assembleDebug failed with exit code 1
解决：
需有效网络访问到Google服务器，如果不能满足就需要修改镜像为国内的，具体修改为两处:
1.修改Flutter SDK 目录下的Flutter 打包配置文件flutter.gradle
因我下载Flutter SDK是放在文稿目录下，所以flutter.gradle路径为
/Users/cosmo/Documents/flutter/packages/flutter_tools/gradle/flutter.gradle
图1-flutter.gradle 路径.png
找到Flutter SDK 的Flutter 打包配置文件flutter.gradle ，可用Sublime Text打开编辑
修改1：
buildscript {
repositories {
//注销默认地址
// google()
// jcenter()
// 换用阿里镜像
maven { url 'https://maven.aliyun.com/repository/google' }
maven { url 'https://maven.aliyun.com/repository/jcenter' }
maven { url 'http://maven.aliyun.com/nexus/content/groups/public' }
}
dependencies {
classpath 'com.android.tools.build:gradle:3.5.0'
}
}
修改2：
class FlutterPlugin implements Plugin<Project> {
// 注释
// private static final String DEFAULT_MAVEN_HOST = "https://storage.googleapis.com";
//换用此行
private static final String DEFAULT_MAVEN_HOST = "https://storage.flutter-io.cn";
// The platforms that can be passed to the `--Ptarget-platform` flag.
private static final String PLATFORM_ARM32 = "android-arm";
private static final String PLATFORM_ARM64 = "android-arm64";
private static final String PLATFORM_X86 = "android-x86";
private static final String PLATFORM_X86_64 = "android-x64";
修改3：
void addFlutterDependencies(buildType) {
String flutterBuildMode = buildModeFor(buildType)
if (!supportsBuildMode(flutterBuildMode)) {
return
}
String hostedRepository = System.env.FLUTTER_STORAGE_BASE_URL ?: DEFAULT_MAVEN_HOST
String repository = useLocalEngine()
? project.property('local-engine-repo')
: "$hostedRepository/download.flutter.io"
project.rootProject.allprojects {
repositories {
maven {
url repository
}
// 添加阿里镜像
maven { url 'https://maven.aliyun.com/repository/google' }
maven { url 'https://maven.aliyun.com/repository/jcenter' }
maven { url 'http://maven.aliyun.com/nexus/content/groups/public' }
}
}
2.修改Flutter项目下的android工程目录下的build.gradle文件
Android Studio打开你的Flutter项目工程，修改android目录下的build.gradle文件
图2-Flutter示例her_app项目中build.gradle文件.png
buildscript {
ext.kotlin_version = '1.3.50'
repositories {
//注销默认
// google()
// jcenter()
//阿里镜像
maven { url 'https://maven.aliyun.com/repository/google'}
maven { url 'https://maven.aliyun.com/repository/jcenter'}
maven { url 'http://maven.aliyun.com/nexus/content/groups/public'}
}
dependencies {
classpath 'com.android.tools.build:gradle:3.5.0'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
}
}
allprojects {
repositories {
//注销默认
// google()
// jcenter()
//阿里镜像
maven { url 'https://maven.aliyun.com/repository/google'}
maven { url 'https://maven.aliyun.com/repository/jcenter'}
maven { url 'http://maven.aliyun.com/nexus/content/groups/public'}
}
}
rootProject.buildDir = '../build'
subprojects {
project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
project.evaluationDependsOn(':app')
}
task clean(type: Delete) {
delete rootProject.buildDir
}
编译运行
Launching lib/main.dart on Huawei P30 Pro in debug mode...
Running Gradle task 'assembleDebug'...
✓ Built build/app/outputs/flutter-apk/app-debug.apk.
Installing build/app/outputs/flutter-apk/app.apk...
Waiting for Huawei P30 Pro to report its views...
...
略之
...
io.flutter.embedding.android.FlutterActivity.onCreate(android.os.Bundle)
I/OpenGLRenderer( 1977): Davey! duration=3542ms; Flags=1, IntendedVsync=446156254524, Vsync=449522921056, OldestInputEvent=9223372036854775807, NewestInputEvent=0, HandleInputStart=449523468479, AnimationStart=449523495773, PerformTraversalsStart=449523499548, DrawStart=449538335629, SyncQueued=449538955851, SyncStart=449575150045, IssueDrawCommandsStart=449575376245, SwapBuffers=449624850682, FrameCompleted=449735079179, DequeueBufferDuration=48265000, QueueBufferDuration=535000,
即ok
问题2：
Launching lib/main.dart on Huawei P30 Pro in debug mode...
Running Gradle task 'assembleDebug'...
FAILURE: Build failed with an exception.
* What went wrong:
Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
> Failed to find Build Tools revision 28.0.3
* 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 1s
Exception: Gradle task assembleDebug failed with exit code 1
解决：
因安装Android SDK时会自动帮我们安装一些必须的构建工具。根据报错信息
Failed to find Build Tools revision 28.0.3
在Appearance & Behavior ->System Settings ->Anroid SDK -> SDK Tools 勾选下载Android SDK 对应需要的构建工具installed即可：
图3-构建工具下载.png
问题3：
Launching lib/main.dart on Huawei P30 Pro in debug mode...
Running Gradle task 'assembleDebug'...
FAILURE: Build failed with an exception.
* What went wrong:
Could not determine the dependencies of task ':app:compileDebugJavaWithJavac'.
> Failed to find Platform SDK with path: platforms;android-29
* 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 10s
Exception: Gradle task assembleDebug failed with exit code 1
解决：
根据报错信息
Failed to find Platform SDK with path: platforms;android-29
在Appearance & Behavior ->System Settings -> Anroid SDK -> SDK Platforms 勾选下载Android SDK 对应缺失版本installed即可：
图4-Android SDK 版本.png
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