Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel unknown, v1.10.2-pre.40, on Microsoft Windows [Version 10.0.17134.1006], locale en-US)

[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    X Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup for detailed instructions.
[√] Chrome - develop for the web
[√] Android Studio (version 3.3)
[√] Android Studio (version 3.5)
[√] VS Code (version 1.38.1)
[√] Connected device (2 available)

! Doctor found issues in 1 category.
PS E:\QUALITY 2\iso_flutter> flutter doctor -v
[√] Flutter (Channel unknown, v1.10.2-pre.40, on Microsoft Windows [Version 10.0.17134.1006], locale en-US)
    • Flutter version 1.10.2-pre.40 at C:\flutter\flutter
    • Framework revision b4ab5cfe79 (8 days ago), 2019-09-16 20:34:25 -0700
    • Engine revision 7ea9884ab0
    • Dart version 2.5.0 (build 2.5.0-dev.4.0 be66176534)

[!] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
    • Android SDK at C:\flutter\sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-28, build-tools 28.0.3
    • ANDROID_HOME = C:\flutter\sdk
    • Java binary at: C:\flutter\android-studio\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b01)
    X Android license status unknown.
      Try re-installing or updating your Android SDK Manager.
      See https://developer.android.com/studio/#downloads or visit https://flutter.dev/setup/#android-setup for detailed instructions.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 3.3)
    • Android Studio at C:\Program Files\Android\Android Studio
    • Flutter plugin version 34.0.1
    • Dart plugin version 182.5215
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1248-b01)

[√] Android Studio (version 3.5)
    • Android Studio at C:\flutter\android-studio
    • Flutter plugin version 34.0.4
    • Dart plugin version 191.6183.88
    • Java version OpenJDK Runtime Environment (build 1.8.0_202-release-1483-b01)

[√] VS Code (version 1.38.1)
    • VS Code at C:\Users\Mahmoud salah eldin\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.4.1

[√] Connected device (2 available)
    • Chrome • chrome • web-javascript • Google Chrome 76.0.3809.132
    • Server • web    • web-javascript • Flutter Tools

! Doctor found issues in 1 category.