* Revert "Revert "Add android license verification to doctor and some refactoring" (#14727)"
This reverts commit d26029475222e8b1c7d8b80072c6b6261e2c3551.
* Add tests, fix sdkManagerEnv and use it consistently, and rearrange Status object model
* AnsiSpinner needs to leave the cursor where it found it.
* fix tests
* Const constructor warning only shows up on windows...?
* Avoid crash if we can't find the home directory
* Make pathVarSeparator return a string in the mock
* Implement review comments
* Fix out-of-order problem on stop
Old Android Stuio versions pior to 2.2.0 didn't come with Java bundled. Make sure flutter doesn't crash when we try to determine the Java version of those old Android Studio installations.
It's not just $HOME/.AndroidStudio2.2, it might also be
.AndroidStudioPreview2.3, or .AndroidStudioFooBar1.7, or whatever.
Made the Version parser less throw-happy, and relaxed the directory name
checks to allow for the above.
Fixes#8353.
* Fix bug parsing Gradle version.
Version from pub_semver requires versions of the format X.Y.Z. Gradle
doesn't follow semantic versioning, though, so version parsing would
fail on versions like '3.2'. Fixed by writing a custom Version class.
Also removed a check for apksigner when building Gradle-based projects.
Fixes#8298
* Teach flutter tools to find gradle
Flutter tools will now use Gradle from Android Studio, which is now found automatically.
flutter doctor will verify that Android Studio has been installed, and that the included Gradle is at least version 2.14.1.
It is still possible to manually configure the path to Android Studio (flutter config --android-studio-dir=XXX) or Gradle (flutter config --gradle-dir=XXX), but this should only be necessary if they're installed somewhere non-standard.
Only tested on Linux and macOS for now.
Fixes#8131