在天朝使用jcenter、mavenCentral及google三个远程仓库，Gradle Sync会很慢，google仓库甚至需要科学上网才能访问。为了加快Gradle Sync速度，一招教你优先用 阿里云仓库服务 的仓库作为下载源。

一劳永逸之道
将本项目的gradle/init.d/init.gradle复制到USER_HOME/.gradle/下即可。
USER_HOME在Windows上大约为C:/Users/liyujiang/.gradle/，在Linux上大约为/home/liyujiang/.gradle/。
init.d/init.gradle内容为：

/*** The software is licensed under the Mulan PSL v2.* You can use this software according to the terms and conditions of the Mulan PSL v2.* You may obtain a copy of Mulan PSL v2 at:*     http://license.coscl.org.cn/MulanPSL2* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR* IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR* PURPOSE.* See the Mulan PSL v2 for more details.*/buildscript {repositories {maven { url 'https://maven.aliyun.com/repositories/jcenter' }maven { url 'https://maven.aliyun.com/repositories/google' }maven { url 'https://maven.aliyun.com/repository/gradle-plugin' }}
}allprojects {repositories {maven { url 'https://repo.eclipse.org/content/repositories/paho-releases/' }maven { url 'http://maven.aliyun.com/nexus/content/groups/public/' }maven { url 'https://maven.aliyun.com/repositories/jcenter' }maven { url 'https://maven.aliyun.com/repositories/google' }maven { url 'https://maven.aliyun.com/repository/central' }maven { url "https://www.jitpack.io" }}
}

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