运行 flutter doctor
Flutter 提供了一个 flutter doctor 命令协助我们安装 Flutter 的依赖。它会检查本地是否有 iOS 和 Android 的开发环境。如果检测到依赖缺失，它还会给出对应依赖的安装方法
运行以下命令查看是否需要安装其它依赖项来完成安装：
flutter doctor --verbose简写
flutter doctor --v该命令检查您的环境并在终端窗口中显示报告
$ flutter doctor -v
[✓] Flutter (Channel master, v0.5.7-pre.55, on Mac OS X 10.13.4 17E199, locale zh-Hans-CN)
• Flutter version 0.5.7-pre.55 at /Users/iOSCMB/code/flutterSDK/flutter
• Framework revision 06f63aaa5a (9 hours ago), 2018-07-04 16:55:22 -0700
• Engine revision 21c7d6a5da
• Dart version 2.0.0-dev.63.0.flutter-4c9689c1d2
[!] Android toolchain - develop for Android devices (Android SDK 28.0.1)
• Android SDK at /Users/iOSCMB/AndroidStudio/SDK
• Android NDK at /Users/iOSCMB/AndroidStudio/SDK/ndk-bundle
• Platform android-28, build-tools 28.0.1
• ANDROID_HOME = /Users/iOSCMB/AndroidStudio/SDK
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
✗ Android license status unknown.
[!] iOS toolchain - develop for iOS devices (Xcode 9.3)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 9.3, Build version 9E145
✗ libimobiledevice and ideviceinstaller are not installed. To install, run:
brew install --HEAD libimobiledevice
brew install ideviceinstaller
✗ ios-deploy not installed. To install:
brew install ios-deploy
• CocoaPods version 1.5.3
[✓] Android Studio (version 3.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 26.0.1
• Dart plugin version 173.4700
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
[!] Connected devices
! No devices available
上面有三个地方打叉 一个感叹号,iOS 那部分按照提示做就ok,最下面感叹号电脑连接上 android 手机就好 ,下面记录一下 android 那部分
✗ Android license status unknown.
下面就是记录解决问题所执行的命令
$ flutter doctor --android-licenses
A newer version of the Android SDK is required. To update, run:
/Users/iOSCMB/AndroidStudio/SDK/tools/bin/sdkmanager --update$ /Users/iOSCMB/AndroidStudio/SDK/tools/bin/sdkmanager --update
Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema
at com.android.repository.api.SchemaModule$SchemaModuleVersion.<init>(SchemaModule.java:156)
at com.android.repository.api.SchemaModule.<init>(SchemaModule.java:75)
at com.android.sdklib.repository.AndroidSdkHandler.<clinit>(AndroidSdkHandler.java:81)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:73)
at com.android.sdklib.tool.sdkmanager.SdkManagerCli.main(SdkManagerCli.java:48)
Caused by: java.lang.ClassNotFoundException: javax.xml.bind.annotation.XmlSchema
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:185)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:496)
... 5 more$ export SDKMANAGER_OPTS="--add-modules java.se.ee"
$ /Users/iOSCMB/AndroidStudio/SDK/tools/bin/sdkmanager --update
...
Accept? (y/N): y再次检查一下 会出现下面的错误
$ flutter doctor -v
! Some Android licenses not accepted. To resolve this, run: flutter doctor --android-licenses然后
$ flutter doctor --android-licenses
Accept? (y/N): y 多输几次 y, 最后就是
$ flutter doctor --verbose
[✓] Flutter (Channel master, v0.5.7-pre.55, on Mac OS X 10.13.4 17E199, locale zh-Hans-CN)
• Flutter version 0.5.7-pre.55 at /Users/iOSCMB/code/flutterSDK/flutter
• Framework revision 06f63aaa5a (14 hours ago), 2018-07-04 16:55:22 -0700
• Engine revision 21c7d6a5da
• Dart version 2.0.0-dev.63.0.flutter-4c9689c1d2
[✓] Android toolchain - develop for Android devices (Android SDK 28.0.1)
• Android SDK at /Users/iOSCMB/AndroidStudio/SDK
• Android NDK at /Users/iOSCMB/AndroidStudio/SDK/ndk-bundle
• Platform android-28, build-tools 28.0.1
• ANDROID_HOME = /Users/iOSCMB/AndroidStudio/SDK
• Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
• All Android licenses accepted.
[✓] iOS toolchain - develop for iOS devices (Xcode 9.3)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Xcode 9.3, Build version 9E145
• ios-deploy 1.9.2
• CocoaPods version 1.5.3
[✓] Android Studio (version 3.1)
• Android Studio at /Applications/Android Studio.app/Contents
• Flutter plugin version 26.0.1
• Dart plugin version 173.4700
• Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1024-b01)
[✓] Connected devices (1 available)
• MI 3 • 016b56a0 • android-arm • Android 4.4.4 (API 19)