Trusty doesn't support android?

.travis.yml

@@ -1,6 +1,5 @@
 language: android
 sudo: required
-dist: trusty
 jdk: oraclejdk8
 env:
   matrix:
@@ -17,14 +16,6 @@ android:
   licenses:
     - 'android-sdk-license-.+'
 
-before_cache:
-  - rm -f $HOME/.gradle/caches/modules-2/modules-2.lock
-
-cache:
-  directories:
-    - $HOME/.gradle/caches/
-    - $HOME/.gradle/wrapper/
-
 before_install:
   - echo no | android create avd --force -n test -t $ANDROID_TARGET --abi $ANDROID_ABI
   - emulator -avd test -no-skin -no-audio -no-window &