* Use latest Android SDK tools for easier license handling
* Reduce installed SDK components to minimum (tools & build tools)
* Reduce unnecessary PATH manipulation
* Use preinstalled Gradle on Travis CI
* Improve Gradle output on Travis CI
* Use default image on AppVeyor
* Improve formatting & other minor tweaks
* Print Gradle version used for Java tests during build
* Allow Java tests to be run from any directory
* Simplify Promise wrapping in Java tests runner
* Minor improvements
Before this, Gradle 4.4 was required to build the Gradle wrapper and
thus run the Java tests. This was because of all the stuff that had to
be configured when running the wrapper task using the build.gradle file.
Now we use a config file that only specifies the required Gradle version
and nothing else to run the wrapper task. This allows tests to be run
with Gradle versions beginning with 2.
This fixes the following issues:
* run_java_unit_tests.js always has exit code of 0 thus never failing
the npm tests.
* "Tests completed successfully" is printed after failing to create the
Gradle wrapper and never running the tests.
* Gradle errors are printed twice
The `android-versions@1.3.0` version now has support for Android SDK level
27 thanks to https://github.com/dvoiss/android-versions/commit/230957205eeb26e569096251a32179e88a28acfc.
As the `android-versions` npm is a "bundled dependency" this will only
take effect when a new version of `cordova-android` is published, since
bundled dependencies are packed within the npm at publish time, not
automatically fetched as dependencies at publish time (which would have
normally been covered for new installations of cordova-android@7.0.0
thanks to semver caret notation).
Fixes issue where commands that list images will crash when an image with a version not present in `android-versions` is encountered, as is presently the case with API 27:
```
cordova run android --list
Available android devices:
Available android virtual devices:
LEVEL: null
ERROR: TypeError: Cannot read property 'semver' of null
An unexpected error has occured while running list-emulator-images with code 2: Error: /home/chris/Repositories/acp-guidelines/cordova/platforms/android/cordova/lib/list-emulator-images: Command failed with exit code 2
```
Signed-off-by: Chris Alfano <chris@jarv.us>
Raphael von der Grün