build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
apply from: "config.gradle"

buildscript {
    repositories {
        jcenter()
        mavenCentral()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.2'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
        /*快速生成渠道包*/
        classpath 'com.leon.channel:plugin:1.1.7'
    }
}

allprojects {
    repositories {
        jcenter()
        mavenCentral()
        google()
        maven { url "https://jitpack.io" }
        maven { url 'https://maven.google.com' }
    }

    tasks.withType(JavaCompile) {
        options.encoding = "UTF-8"
    }
}

subprojects {
    project.configurations.all {
        resolutionStrategy.eachDependency { details ->
            if (details.requested.group == 'com.android.support'
                    && !details.requested.name.contains('multidex')
                    && !details.requested.name.contains('constraint')
            ) {
                details.useVersion '28.0.0'//改这个版本号到你想要的版本
            }
        }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}