Cleanup CI configurations

* 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

.travis.yml

@@ -2,28 +2,32 @@ language: android
 sudo: false
 jdk:
     - oraclejdk8
-env:
-    global:
-      - ANDROID_TOOLS=${ANDROID_HOME}/tools
-before_install:
-    - nvm install 6
-    # ensure at least gradle 3.3 is in place.
-    - wget http://services.gradle.org/distributions/gradle-3.3-bin.zip
-    - unzip gradle-3.3-bin.zip
-    - export GRADLE_HOME=$PWD/gradle-3.3
-    - export PATH=${GRADLE_HOME}/bin:${ANDROID_HOME}:${ANDROID_HOME}/emulator:${ANDROID_TOOLS}:${ANDROID_TOOLS}/bin:${ANDROID_HOME}/platform-tools:$PATH
-    - node --version
-    - gradle --version
-    - echo y | android --silent update sdk --no-ui --all --filter platform-tools,tools,build-tools-26.0.2,android-26,android-25,extra-google-m2repository,extra-android-m2repository
-    - yes | sdkmanager --update
+
 android:
     components:
-      - tools
+        - build-tools-26.0.2
+env:
+    global:
+        # Keep gradle from crapping all over the log
+        - TERM=dumb
+
 install:
+    # Install a sdkmanager version that supports the --licenses switch and
+    # accept any Android SDK licenses. The output redirection prevents us from
+    # hitting the travis log size limit of 4MB which would fail the build.
+    - yes | sdkmanager tools > /dev/null
+    - yes | sdkmanager --licenses > /dev/null
+
+    - nvm install 6
     - npm install
     - npm install -g codecov
+
 script:
+    - gradle --version
+    - node --version
+    - npm --version
     - npm test
     - npm run cover
+
 after_script:
     - codecov

appveyor.yml

@@ -1,40 +1,36 @@
-image:
-  - Previous Visual Studio 2015
-
 environment:
-  ANDROID_HOME: "C:\\android"
-  # If the gradle daemon is used, the build hangs after generating the wrapper
-  GRADLE_OPTS: -Dorg.gradle.daemon=false
-  matrix:
-  - nodejs_version: "4"
-  - nodejs_version: "6"
-  - nodejs_version: "8"
-
-init:
-  - mkdir "%ANDROID_HOME%
-  - cd "%ANDROID_HOME%"
-  - appveyor DownloadFile "https://dl.google.com/android/repository/tools_r25.2.3-windows.zip"
-  - 7z x "tools_r25.2.3-windows.zip" > nul
-  - cd "C:\projects\cordova-android"
+    ANDROID_HOME: "C:\\android"
+
+    # If the gradle daemon is used, the build hangs after generating the wrapper
+    GRADLE_OPTS: -Dorg.gradle.daemon=false
+
+    # URL for SDK Tools, Revision 26.1.1 (September 2017)
+    SDK_TOOLS_URL: https://dl.google.com/android/repository/sdk-tools-windows-3859397.zip
+
+    matrix:
+        - nodejs_version: 4
+        - nodejs_version: 6
+        - nodejs_version: 8
 
 install:
-  - choco install gradle -version 3.4.1
-  - gradle -version
-  - echo y | "%ANDROID_HOME%\tools\android.bat" --silent update sdk --no-ui --all --filter platform-tools,tools,build-tools-26.0.2,android-26,android-25,extra-google-m2repository,extra-android-m2repository
-  # on windows we need to accept sublicenses for the new tooling, wee. 30 is an arbitrary number,
-  # but should be the maximum number of licenses we explicitly need to type "Y ENTER" for.
-  # also, the sdkmanager in all its glory leaks a bit of output to stderr, and powershell
-  # and appveyor interpret that as errors, and blows up. so, when piping in our "Y ENTER"
-  # responses, we invoke cmd so we can redirect stderr to stdout, and tell it to --update itself.
-  - ps: for($i=0;$i -lt 30;$i++) { $response += "y`n"}; $response | cmd /c 'C:\android\tools\bin\sdkmanager.bat 2>&1' --update
-  - ps: Install-Product node $env:nodejs_version
-  - npm install
-  # below is a workaround on using gradle installed via choco on appveyor
-  - set path=C:\ProgramData\chocolatey\lib\gradle\tools\gradle-3.4.1\bin;%path%
+    # Install Android SDK Tools
+    - mkdir "%ANDROID_HOME%"
+    - appveyor DownloadFile "%SDK_TOOLS_URL%" -FileName "%TMP%/sdk-tools.zip"
+    - 7z x "%TMP%/sdk-tools.zip" -o"%ANDROID_HOME%" > nul
+    - set PATH=%PATH%;"%ANDROID_HOME%\tools\bin"
+
+    - yes 2> nul | sdkmanager --licenses > nul
+    - sdkmanager "build-tools;26.0.2"
+
+    - choco install gradle --version 3.4.1
+
+    - ps: Install-Product node $env:nodejs_version
+    - npm install
 
 build: off
 
 test_script:
-  - node --version
-  - npm --version
-  - npm test
+    - gradle --version
+    - node --version
+    - npm --version
+    - npm test