flutter doctor -v
[√] Flutter (Channel master, v1.10.2-pre.36, on Microsoft Windows [Version 6.1.7601], locale ru-RU)
• Flutter version 1.10.2-pre.36 at C:\flutter
• Framework revision 32c946f31b (6 hours ago), 2019-09-10 20:49:27 -0700
• Engine revision 7ea9884ab0
• Dart version 2.5.0 (build 2.5.0-dev.4.0 be66176534)

[X] Android toolchain - develop for Android devices
X Unable to locate Android SDK.
Install Android Studio from: https://developer.android.com/studio/index.html
On first launch it will assist you in installing the Android SDK components.
(or visit https://flutter.dev/setup/#android-setup for detailed instructions).
If the Android SDK has been installed to a custom location, set ANDROID_HOME to that location.
You may also want to add it to your PATH environment variable.


[☠] Visual Studio - develop for Windows (the doctor check crashed)
X Due to an error, the doctor check did not complete. If the error message below is not helpful, please let us know
about this issue at https://github.com/flutter/flutter/issues.
X type 'String' is not a subtype of type 'bool'
• #0 VisualStudio.isPrerelease (package:flutter_tools/src/windows/visual_studio.dart:40:7)
#1 VisualStudioValidator.validate (package:flutter_tools/src/windows/visual_studio_validator.dart:33:24)
<asynchronous suspension>
#2 asyncGuard.<anonymous closure> (package:flutter_tools/src/base/async_guard.dart:111:32)
<asynchronous suspension>
#3 _rootRun (dart:async/zone.dart:1124:13)
#4 _CustomZone.run (dart:async/zone.dart:1021:19)
#5 _runZoned (dart:async/zone.dart:1516:10)
#6 runZoned (dart:async/zone.dart:1500:12)
#7 asyncGuard (package:flutter_tools/src/base/async_guard.dart:109:3)
#8 Doctor.startValidatorTasks (package:flutter_tools/src/doctor.dart:151:11)
#9 Doctor.diagnose (package:flutter_tools/src/doctor.dart:244:41)
#10 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:43:6)
#11 Doctor.diagnose (package:flutter_tools/src/doctor.dart:234:24)
#12 DoctorCommand.runCommand (package:flutter_tools/src/commands/doctor.dart:59:39)
#13 _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:43:6)
#14 DoctorCommand.runCommand (package:flutter_tools/src/commands/doctor.dart:45:42)
#15 FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:490:18)
#16 _asyncThenWrapperHelper.<anonymous closure> (dart:async-patch/async_patch.dart:71:64)
#17 _rootRunUnary (dart:async/zone.dart:1132:38)
#18 _CustomZone.runUnary (dart:async/zone.dart:1029:19)
#19 _FutureListener.handleValue (dart:async/future_impl.dart:137:18)
#20 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:678:45)
#21 Future._propagateToListeners (dart:async/future_impl.dart:707:32)
#22 Future._completeWithValue (dart:async/future_impl.dart:522:5)
#23 Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:552:7)
#24 _rootRun (dart:async/zone.dart:1124:13)
#25 _CustomZone.run (dart:async/zone.dart:1021:19)
#26 _CustomZone.runGuarded (dart:async/zone.dart:923:7)
#27 _CustomZone.bindCallbackGuarded.<anonymous closure> (dart:async/zone.dart:963:23)
#28 _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#29 _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#30 _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:116:13)
#31 _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:173:5)


[!] Android Studio (not installed)
• Android Studio not found; download from https://developer.android.com/studio/index.html
(or visit https://flutter.dev/setup/#android-setup for detailed instructions).

[√] Connected device (1 available)
• Windows • Windows • windows-x64 • Microsoft Windows [Version 6.1.7601]

! Doctor found issues in 3 categories.