如何将我旧的Android应用程序迁移到当前版本？

Question

我已经在Android应用程序上使用Gradle版本5.1.1开发了

现在，我正在尝试将Android应用程序升级到当前版本。

我需要对应用程序进行更改，需要使用最新的Gradle版本进行升级。 如何升级我的Android应用程序。

build.gradle：

buildscript {
    repositories {
        maven {
            url 'https://maven.fabric.io/public'
        }
        jcenter()
        maven {
            url 'https://maven.google.com/'
            name 'Google'
        }
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.4.1'
        classpath "net.saliman:gradle-cobertura-plugin:2.4.0"
        classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
        classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.8.4'
        classpath 'com.novoda:bintray-release:0.9'
        classpath 'nl.javadude.gradle.plugins:license-gradle-plugin:0.11.0'
        classpath 'com.bmuschko:gradle-nexus-plugin:2.3.1'
        classpath 'com.google.gms:google-services:4.2.0'
        classpath 'io.fabric.tools:gradle:1.27.0'

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

allprojects {

    ext {
        libraryVersion = '1.0'
        mavenGroupId = 'com.abcd'
        siteUrl = 'https://github.com/txusballesteros/fit-chart'
        gitUrl = 'https://github.com/txusballesteros/fit-chart.git'

        compileSdkVersion = 28
        buildToolsVersion = "28.0.3"
        minSdkVersion = 21
        targetSdkVersion = 28
        supportLibraryVersion = "28.0.0"
        junitVersion = "4.12"
    }

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

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

subprojects {
    project.configurations.all {
        resolutionStrategy.eachDependency { details ->
            if (details.requested.group == 'com.android.support'
                    && !details.requested.name.contains('multidex') ) {
                details.useVersion "28.0.0"
            }
        }
    }
}

错误图像：

任何对此有所了解的人，请帮助我解决解决方案。