Try out android-sdk-installer

.gitlab-ci.yml

-#Derived from https://about.gitlab.com/2016/11/30/setting-up-gitlab-ci-for-android-projects/
-image: openjdk:8-jdk
-
-variables:
-  ANDROID_COMPILE_SDK: "25"
-  ANDROID_BUILD_TOOLS: "25.0.3"
-  ANDROID_SDK_TOOLS: "25.2.3"
+image: commit451/android-sdk:latest
 before_script:
-  - wget --quiet --output-document=android-sdk.zip https://dl.google.com/android/repository/tools_r${ANDROID_SDK_TOOLS}-linux.zip
-  - unzip -q android-sdk.zip -d android-sdk
-  - export ANDROID_HOME=$PWD/android-sdk
-  - echo y | $ANDROID_HOME/tools/bin/sdkmanager "platforms;android-$ANDROID_COMPILE_SDK"
-  - echo y | $ANDROID_HOME/tools/bin/sdkmanager "build-tools;$ANDROID_BUILD_TOOLS"
+  - android-sdk-installer
 stages:
   - build
@@ -25,4 +15,4 @@ build:
 test:
   stage: test
   script:
-    - ./gradlew testFdroidDebug
\ No newline at end of file
+    - ./gradlew testFdroidDebug

.travis.yml

-language: android
+language: java
+
+env:
+  - ANDROID_HOME=$PWD/android-sdk
 jdk:
   - oraclejdk8
-android:
-  components:
-    - platform-tools
-    - tools
-    - build-tools-25.0.3
-    - android-25
-    - extra-android-m2repository
-    - extra-google-m2repository
+before_install:
+  - rvm install 2.3.4
+  - gem install android-sdk-installer
+  - android-sdk-installer -i
 script: "./gradlew testFdroidDebug"

android-sdk-installer.yml

+debug: true
+components:
+  - build-tools;25.0.3
+  - platforms;android-25
+  - extras;google;m2repository