[Flutter] Fix install error "cmdline-tools component is missing" and "Android license status"

Command line tools are very useful during android app development with Flutter. In some cases you may have difficulty installing it due to version incompatibility or conflicts with other software. After installing cmdline-tools you can continue to confirm the Android license.

Sample Flutter doctor analytic info:

C:\Users>flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 3.0.5, on Microsoft Windows [Version 10.0.19043.1826], locale en-US)
[!] Android toolchain - develop for Android devices (Android SDK version 33.0.0)
    X cmdline-tools component is missing
      Run `path/to/sdkmanager --install "cmdline-tools;latest"`
      See https://developer.android.com/studio/command-line for more details.
    X Android license status unknown.
      Run `flutter doctor --android-licenses` to accept the SDK licenses.
      See https://flutter.dev/docs/get-started/install/windows#android-setup for more details.
[√] Chrome - develop for the web
[X] Visual Studio - develop for Windows
    X Visual Studio not installed; this is necessary for Windows development.
      Download at https://visualstudio.microsoft.com/downloads/.
      Please install the "Desktop development with C++" workload, including all of its default components
[√] Android Studio (version 2021.2)
[√] VS Code (version 1.69.2)
[√] Connected device (3 available)
[√] HTTP Host Availability
! Doctor found issues in 2 categories.

As suggested, you just need to run the command: Run `path/to/sdkmanager --install "cmdline-tools;latest"`. But there might be an error: Exception in thread "main" java.lang.NoClassDefFoundError: javax/xml/bind/annotation/XmlSchema. In this case we can fix it by installing cmdline-tools through Android Studio. This method is always applicable and very easy to do.

Step 1: In the Android Studio software, you click on the menu Tools >> SDK Manager

Step 2: In the SDK Manager setting screen, select the "SDK Tools" tab. Then tick "Android SDK Command-line Tools (lastest)". Finally click "Apply" to start the installation.

Step 3: After installing "Command-line Tools" you can open a command line window to continue to confirm "Android licenses"

flutter doctor --android-licenses

Done ! Check Flutter doctor to make sure everything is fully installed. Good luck.