Ionic 3项目crosswalk报错：Could not resolve org.xwalk:xwalk_core_library:23 .

启动Ionic 3项目：

ionic cordova run android --prod

报错信息：

> Could not resolve all dependencies for configuration ':_armv7DebugApkCopy'.
> Could not resolve org.xwalk:xwalk_core_library:23+.
Required by:
project :
> Could not resolve org.xwalk:xwalk_core_library:23+.
> Failed to list versions for org.xwalk:xwalk_core_library.
> Unable to load Maven meta-data from https://download.01.org/crosswalk/releases/crosswalk/android/maven2/org /xwalk/xwalk_core_library/maven-metadata.xml.
> Could not GET 'https://download.01.org/crosswalk/releases/crosswalk/android/maven2/org/xwalk/xwalk\_core\_ library/maven-metadata.xml'. Received status code 503 from server: Service Unavailable

* Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Error: cmd: Command failed with exit code 1 Error output: FAILURE: Build failed with an exception.

解决方法：

这可能是01.org服务器的问题，可以让Gradle使用Crosswalk本地的副本。

获取Crosswalk版本的两种方法：

1. 在platforms/android/build/intermediates/exploded-aar/org.xwalk‌​/xwalk_core_library/‌​目录下可以找到类似23.53.589.4的版本号
2. 在 Google cache选对应的版本号

修改gradle

打开项目下的platforms\android\cordova-plugin-crosswalk-webview\*-xwalk.gradle，其中*为项目名，把

dependencies {
    compile xwalkSpec
}

修改为指定Crosswalk的版本号

dependencies {
    compile 'org.xwalk:xwalk_core_library:23.53.589.4'
}