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解决

低版本的android导入高版本的工程
7.2修改适配android 4.2.1

1、setting.gradle

保留rootProject.name = ""和include ‘:app’，其余注释

//pluginManagement {
//    repositories {
//        gradlePluginPortal()
//        google()
//        mavenCentral()
//    }
//}
//dependencyResolutionManagement {
//    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
//    repositories {
//        google()
//        mavenCentral()
//    }
//}
rootProject.name = "Setting"
include ':app'

2、build.gradle

注释掉原先的plugins{}
添加
buildscript {}
allprojects {}
task clean(type: Delete) {
delete rootProject.buildDir
}

 Top-level build file where you can add configuration options common to all sub-projects/modules.
//plugins {
//    id 'com.android.application' version '7.3.1' apply false
//    id 'com.android.library' version '7.3.1' apply false
//}
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        google()
        mavenCentral()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.2.1"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        mavenCentral()
        jcenter() // Warning: this repository is going to shut down soon
    }
}

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