Android studio可以升級到3.1了，預設用的是gradle4.4

修改為

distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-all.zip

buildscript {
    repositories {
        jcenter()
        google()
        maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'}
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.0'
 
classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
// NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
}
}

allprojects {
    repositories {
        jcenter()
        maven{ url 'http://maven.aliyun.com/nexus/content/groups/public/'
 
}
        maven { url "https://jitpack.io" }
        google()
    }
}

再把所有的依賴包改成，implementation.