按照官网的教程：https://flutterchina.club/setup-macos/
一步步来，到flutter doctor报错，根据错误提示修改错误。
我的错误记录
用Android studio新建flutter项目报如下错误
error installing flutter null returned 1
Android studio在创建flutter项目选择SDK path时，提示的错误。
其中SDK path就是从官网下载的SDK，flutter文件夹地址。当flutter doctor命令没有验证通过时，选择SDK path会报这个错误。需要执行flutter doctor查看的报错
✗ libimobiledevice and ideviceinstaller are not installed. To install with
Brew, run:
brew update
brew install --HEAD usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
brew install ideviceinstaller
依次执行上述提示的brew命令（上面的命令有问题），再次flutter doctor
当mac插上手机设备报如下错误：
Unhandled exception:
Exception: idevice_id returned an error:
#0 IMobileDevice.getInfoForDevice (package:flutter_tools/src/ios/mac.dart:122:9)
<asynchronous suspension>
#1 IOSDevice.getAttachedDevices (package:flutter_tools/src/ios/devices.dart:152:53)
<asynchronous suspension>
#2 IOSDevices.pollingGetDevices (package:flutter_tools/src/ios/devices.dart:112:57)
#3 PollingDeviceDiscovery.devices (package:flutter_tools/src/device.dart:163:52)
<asynchronous suspension>
#4 DeviceManager.getAllConnectedDevices (package:flutter_tools/src/device.dart:91:46)
<asynchronous suspension>
#5 DeviceValidator.validate (package:flutter_tools/src/doctor.dart:677:54)
<asynchronous suspension>
#6 Doctor.startValidatorTasks (package:flutter_tools/src/doctor.dart:107:52)
#7 Doctor.diagnose (package:flutter_tools/src/doctor.dart:174:41)
#8 _AsyncAwaitCompleter.start (dart:async/runtime/libasync_patch.dart:49:6)
#9 Doctor.diagnose (package:flutter_tools/src/doctor.dart:164:24)
#10 DoctorCommand.runCommand (package:flutter_tools/src/commands/doctor.dart:29:39)
#11 _AsyncAwaitCompleter.start (dart:async/runtime/libasync_patch.dart:49:6)
#12 DoctorCommand.runCommand (package:flutter_tools/src/commands/doctor.dart:28:42)
#13 FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:383:18)
#14 _asyncThenWrapperHelper.<anonymous closure> (dart:async/runtime/libasync_patch.dart:77:64)
#15 _rootRunUnary (dart:async/zone.dart:1132:38)
#16 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#17 _FutureListener.handleValue (dart:async/future_impl.dart:129:18)
#18 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:642:45)
#19 Future._propagateToListeners (dart:async/future_impl.dart:671:32)
#20 Future._complete (dart:async/future_impl.dart:476:7)
#21 _SyncCompleter.complete (dart:async/future_impl.dart:51:12)
#22 _AsyncAwaitCompleter.complete.<anonymous closure> (dart:async/runtime/libasync_patch.dart:33:20)
#23 _rootRun (dart:async/zone.dart:1124:13)
#24 _CustomZone.run (dart:async/zone.dart:1021:19)
#25 _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:947:23)
#26 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#27 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#28 _runPendingImmediateCallback (dart:isolate/runtime/libisolate_patch.dart:115:13)
#29 _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:172:5)
其实是上面的brew命令有问题，解决办法：
brew update
brew uninstall --ignore-dependencies libimobiledevice
brew uninstall --ignore-dependencies usbmuxd
brew install --HEAD usbmuxd
brew unlink usbmuxd
brew link usbmuxd
brew install --HEAD libimobiledevice
再次flutter doctor
这次只有一个错误
[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
✗ Android license status unknown
执行下面命令，来接受安卓许可证协议
flutter doctor --android-licenses
报错
A newer version of the Android SDK is required. To update, run:
/Users/duan/Library/Android/sdk/tools/bin/sdkmanager --update
解决方法是使用SDKMANAGER_OPTS环境变量
export SDKMANAGER_OPTS="--add-modules java.se.ee"
之后再执行
flutter doctor --android-licenses
依次y回车，来接收许可证
再次flutter doctor，结果：
[✓] Flutter (Channel stable, v1.2.1, on Mac OS X 10.14.2 18C54, locale zh-Hans-CN)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] iOS toolchain - develop for iOS devices (Xcode 10.1)
[✓] Android Studio (version 3.3)
[✓] VS Code (version 1.31.1)
[✓] Connected device (2 available)
• No issues found!
成功~
最后记录下运行后的错误处理：
ERROR: Could not connect to lockdownd, error code -17
这是设备和计算机没有建立信任关系，手机和电脑互相信任就可以了
