我遇到了安装问题。当我运行 flutter doctor 时，我得到以下信息
[?] Flutter (Channel beta, v0.4.4, on Mac OS X 10.11.6 15G19009, locale en)
• Flutter version 0.4.4 at /Users/divyakrishnan/Development/flutter
• Framework revision f9bb4289e9 (11 days ago), 2018-05-11 21:44:54 -0700
• Engine revision 06afdfe54e
• Dart version 2.0.0-dev.54.0.flutter-46ab040e58
[?] Android toolchain - develop for Android devices (Android SDK 27.0.3)
• Android SDK at /Users/divyakrishnan/Library/Android/sdk
• Android NDK location not configured (optional; useful for native profiling support)
• Platform android-27, build-tools 27.0.3
• Java binary at: /Applications/Android Studio …