Update android SDK and build tools

.travis.yml

@@ -5,8 +5,8 @@ os: osx
 osx_image: xcode9.3
 
 env:
-  - TARGET_PLATFORM=android
   - TARGET_PLATFORM=ios
+  - TARGET_PLATFORM=android ANDROID_API_LEVEL=27 ANDROID_BUILD_TOOLS_VERSION=28.0.3
 
 cache:
   directories:
@@ -23,9 +23,9 @@ install:
 - if [ $TARGET_PLATFORM = "android" ]; then
     brew update &&
     brew install gradle &&
-    scripts/setup-android-sdk.sh &&
+    scripts/setup-android-sdk.sh -a $ANDROID_API_LEVEL -b $ANDROID_BUILD_TOOLS_VERSION &&
     export ANDROID_HOME=$(pwd)/android-sdk-macosx &&
-    export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools:$ANDROID_HOME/build-tools/23.0.2;
+    export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools:$ANDROID_HOME/build-tools/$ANDROID_BUILD_TOOLS_VERSION;
   fi
 
 script:

scripts/setup-android-sdk.sh

@@ -1,12 +1,19 @@
 #!/usr/bin/env bash
 set -e
 
+while getopts a:b: option; do
+  case "${option}" in
+    a) API_LEVEL=${OPTARG};;
+    b) BUILD_TOOLS_VERSION=${OPTARG};;
+  esac
+done
+
 curl http://dl.google.com/android/android-sdk_r24.4-macosx.zip -o android-sdk-macosx.zip
 tar -xvf android-sdk-macosx.zip
 
 echo y | ./android-sdk-macosx/tools/android update sdk --no-ui --all --filter platform-tools
-echo y | ./android-sdk-macosx/tools/android update sdk --no-ui --all --filter build-tools-25.0.0
-echo y | ./android-sdk-macosx/tools/android update sdk --no-ui --all --filter android-25
+echo y | ./android-sdk-macosx/tools/android update sdk --no-ui --all --filter build-tools-${BUILD_TOOLS_VERSION}
+echo y | ./android-sdk-macosx/tools/android update sdk --no-ui --all --filter android-${API_LEVEL}
 echo y | ./android-sdk-macosx/tools/android update sdk --no-ui --all --filter extra-android-support
 echo y | ./android-sdk-macosx/tools/android update sdk --no-ui --all --filter extra-android-m2repository
 echo y | ./android-sdk-macosx/tools/android update sdk --no-ui --all --filter extra-google-m2repository