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Exit code 1 from: /home/travis/build/flutter/flutter sdk/examples/flutter_gallery/android/gradlew app:properties:
Starting a Gradle Daemon (subsequent builds will be faster)
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Download https://jcenter.bintray.com/org/glassfish/jaxb/jaxb-core/2.2.11/jaxb-core-2.2.11.jar
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Download https://jcenter.bintray.com/javax/xml/bind/jaxb-api/2.2.12-b140109.1041/jaxb-api-2.2.12-b140109.1041.jar
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Download https://dl.google.com/dl/android/maven2/com/android/tools/build/bundletool/0.1.0-alpha01/bundletool-0.1.0-alpha01.jar
Picked up _JAVA_OPTIONS: -Xmx2048m -Xms512m
Project evaluation failed including an error in afterEvaluate {}. Run with --stacktrace for details of the afterEvaluate {} error.
FAILURE: Build failed with an exception.
* Where:
Build file '/home/travis/build/flutter/flutter sdk/examples/flutter_gallery/android/app/build.gradle' line: 25
* What went wrong:
A problem occurred evaluating project ':app'.
> Could not resolve all files for configuration 'classpath'.
   > Could not resolve com.android.tools.build:gradle:3.1.2.
     Required by:
         unspecified:unspecified:unspecified
      > Could not resolve com.android.tools.build:gradle:3.1.2.
         > Could not get resource 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom'.
            > Could not HEAD 'https://jcenter.bintray.com/com/android/tools/build/gradle/3.1.2/gradle-3.1.2.pom'.
               > Read timed out
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
* Get more help at https://help.gradle.org
BUILD FAILED in 1m 3s
Please review your Gradle project setup in the android/ folder.