最近在做旧工程的升级，原来的Gradle版本是4.6的，需要升级到7.6，JDK从8升级到17，一路趟了很多坑，逐个记录下吧

1、Maven仓库需要升级到https

你会遇到这个报错

Using insecure protocols with repositories, without explicit opt-in, is unsupported. Switch Maven repository 'maven(http://mapmo.baidu.com/artifactory/libs-release)' to redirect to a secure protocol (like HTTPS) or allow insecure protocols. See https://docs.gradle.org/7.6.1/dsl/org.gradle.api.artifacts.repositories.UrlArtifactRepository.html#org.gradle.api.artifacts.repositories.UrlArtifactRepository:allowInsecureProtocol for more details

如果不能升级到https，也是有办法兼容的，改成下边的方式

maven {
            url "http://xxxxxx.com/artifactory/libs-release"
            allowInsecureProtocol = true
            credentials {
                username ""
                password ""
            }
        }

2、gradle语法上的升级，会遇到如下报错

Could not find method provided() for arguments [com.android.support:appcompat-v7:26.+] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler

Could not find method compile() for arguments [directory 'libs'] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler

改起来也简单

provided--->compileOnly

compile--->implementation

3、找不到proguard

Could not get unknown property 'proguard' for project ':XXXXX' of type org.gradle.api.Project.

这个应该是高版本的gradle默认配置了R8，需要自己引入proguard，GPT也回答的似是而非的，这个问题让我蛋疼了很久才解决，方法如下：

在你工程的build.gradle文件中引入proguard

dependencies {
        classpath 'com.android.tools.build:gradle:7.4.2'
        classpath 'com.guardsquare:proguard-gradle:7.1.0'
    }

4、BuildConfig文件找不到

老版本的gradle文件你在buildTypes里边之配置一个release选项即可，也会生成debug的BuildConfig文件，工程中能引用到。升级了之后如果buildTypes里边没有配置debug的选项，会导致不生成debug的BuildConfig文件，导致工程引用不到报错

修改之前文件

buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        
        frame {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

修改之后

buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        debug {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        frame {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

加个debug就好了

5、BuildConfig文件中有属性找不到

这个也很蛋疼，我的BuildConfig文件中，有一个VERSION_NAME属性死活找不到，生成的BuildConfig文件中没有，我在build.gradle文件中也没有明确找到类似于

buildConfigField "String", "VERSION_NAME", "11.2"

这种的语句，所以非常好奇之前的代码是怎么编译过的

最终发现，老版本的gradle会把defaultConfig中的versionCode和versionName属性自动变成VERSION_CODE和VERSION_NAME属性加在BuildConfig文件中，而新版本的gradle文件不会管这个

 所以自己加一下就好了

defaultConfig {
        minSdkVersion rootProject.ext.minSdkVersion
        targetSdkVersion rootProject.ext.targetSdkVersion
        versionCode 1
        versionName rootProject.ext.MAPCOM_VERSION
        buildConfigField "String", "VERSION_NAME", "\"${rootProject.ext.MAPCOM_VERSION}\""
        buildConfigField "String", "MECP_VERSION", "\"${rootProject.ext.MECP_VERSION}\""
        buildConfigField "String", "MAPCOM_VERSION", "\"${rootProject.ext.MAPCOM_VERSION}\""
        buildConfigField "String", "ENGINE_VERSION", "\"${rootProject.ext.ENGINE_VERSION}\""
        buildConfigField "String", "MANUFACTURER", "\"${rootProject.ext.MANUFACTURER}\""

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }

6、class.jar找不到

我在工程中需要把有些工程编译成jar，自己写了gradle函数实现，遇到这么个报错

Cannot expand ZIP '/home/GitDownload/mappreset/mapcom/android/ComBase/build/intermediates/packaged-classes/release/classes.jar' as it does not exist

原来的代码是这么写的

def zipFile = file('build/intermediates/packaged-classes/release/classes.jar')

还是新版本的gradle生成的class.jar的路径变了，改成下边的即可

def zipFile = file('build/intermediates/aar_main_jar/release/classes.jar')

7、Duplicate Strategy问题

报错如下

Entry assets/CircleDashTexture.png is a duplicate but no duplicate handling strategy has been set. Please refer to https://docs.gradle.org/7.6.1/dsl/org.gradle.api.tasks.Copy.html#org.gradle.api.tasks.Copy:duplicatesStrategy for details.

我是编译jar包的函数里边报错的，修改起来不难，加上第一句的冲突处理策略就行了，如下

task makeJar(type:Jar){
    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
    archiveName = SDK_BASENAME + "_" + SDK_VERSION + '.jar'
    // 复制资源文件
    from fileTree(dir: 'src/main', includes: ['assets/**'])
    ***********
}

以上就是趟坑之旅，希望对大家有帮助！