see 10/28 log

Author: Blankj

.travis.yml

@@ -5,22 +5,25 @@ sudo: false
 env:
   global:
     - COMPILE_SDK_VERSION = 26
+    - BUILD_TOOLS_VERSION = 26.0.2
 
 android:
   components:
+    - tools
     - platform-tools
     - tools
+    - build-tools-$BUILD_TOOLS_VERSION
     - android-$COMPILE_SDK_VERSION
 
   licenses:
-    - android-sdk-license-.+
+    - 'android-sdk-preview-license-52d11cd2'
+    - 'android-sdk-license-.+'
     - '.+'
 
   notifications:
     email: false
 
 before_install:
-  - chmod +x gradlew
   - mkdir "$ANDROID_HOME/licenses" || true
   - echo -e "\n8933bad161af4178b1185d1a37fbf41ea5269c55" > "$ANDROID_HOME/licenses/android-sdk-license"
   - echo -e "\n84831b9409646a918e30573bab4c9c91346d8abd" > "$ANDROID_HOME/licenses/android-sdk-preview-license"