use working Android system image

@@ -11,6 +11,20 @@ matrix:
       dist: trusty
       language: android
 
+      android:
+        components:
+          - tools
+          - platform-tools
+
+          - build-tools-26.0.2
+          - android-26
+
+          - extra-google-google_play_services
+          - extra-google-m2repository
+          - extra-android-m2repository
+
+          - sys-img-x86-android-26
+
       install:
         - git clone -b master https://github.com/flutter/flutter.git
         - ./flutter/bin/flutter --version
@@ -18,7 +32,7 @@ matrix:
         - export PATH="$PATH":"$HOME/.pub-cache/bin"
         - export PATH=$PWD/flutter/bin:$PWD/flutter/bin/cache/dart-sdk/bin:$PATH
 
-        - echo no | android create avd --force -n test -t android-22 --abi armeabi-v7a -c 100M
+        - echo no | android create avd --force -n test -t android-26 --abi armeabi-v7a -c 100M
         - emulator -avd test -no-audio -no-window &
         - android-wait-for-emulator
         - adb shell input keyevent 82 &