Self-manage Andorid SDK on Travis

.travis.yml

@@ -48,20 +48,6 @@ matrix:
     - os: linux
       env:
         - SHARD=Build-example-APKs
-      language: android
-      licenses:
-        - 'android-sdk-preview-license-.+'
-        - 'android-sdk-license-.+'
-        - 'google-gdk-license-.+'
-      android:
-        components:
-          - tools
-          - platform-tools
-          - build-tools-25.0.3
-          - android-25
-          - extra-android-m2repository
-          - extra-google-m2repository
-          - extra-google-android-support
       jdk: oraclejdk8
       sudo: false
       addons:
@@ -70,15 +56,30 @@ matrix:
           sources:
             - ubuntu-toolchain-r-test # if we don't specify this, the libstdc++6 we get is the wrong version
           packages:
+            - lib32stdc++6 # https://github.com/flutter/flutter/issues/6207
             - libstdc++6
             - fonts-droid
       before_script:
+        - wget https://dl.google.com/android/repository/sdk-tools-linux-3859397.zip
+        - mkdir android-sdk
+        - unzip -qq sdk-tools-linux-3859397.zip -d android-sdk
+        - export ANDROID_HOME=`pwd`/android-sdk
+        - export PATH=`pwd`/android-sdk/tools/bin:$PATH
+        - mkdir -p /home/travis/.android # silence sdkmanager warning
+        - echo 'count=0' > /home/travis/.android/repositories.cfg # silence sdkmanager warning
+        - echo y | sdkmanager "tools"
+        - echo y | sdkmanager "platform-tools"
+        - echo y | sdkmanager "build-tools;25.0.3"
+        - echo y | sdkmanager "platforms;android-25"
+        - echo y | sdkmanager "extras;android;m2repository"
+        - echo y | sdkmanager "extras;google;m2repository"
+        - echo y | sdkmanager "patcher;v4"
+        - sdkmanager --list
         - wget http://services.gradle.org/distributions/gradle-3.5-bin.zip
         - unzip -qq gradle-3.5-bin.zip
         - export GRADLE_HOME=$PWD/gradle-3.5
         - export PATH=$GRADLE_HOME/bin:$PATH
         - gradle -v
-        - android list targets
         - git clone https://github.com/flutter/flutter.git --depth 1
         - export PATH=`pwd`/flutter/bin:`pwd`/flutter/bin/cache/dart-sdk/bin:$PATH
         - flutter doctor