程序类型在编译期间已经存在

Question

我在构建期间遇到了一些奇怪的情况。这是消息：

Program type already present: org.simpleframework.xml.Attribute

dependencies {
    implementation 'com.android.support:multidex:1.0.1'
    implementation 'com.android.support:appcompat-v7:25.4.0'
    implementation 'com.google.android.gms:play-services:11.8.0'
    implementation 'com.google.gms:google-services:3.3.1'
    implementation 'com.facebook.fresco:fresco:0.6.0'

    implementation files('libs/activation.jar')
    implementation files('libs/additionnal.jar')
    implementation files('libs/mail.jar')

    implementation project(':CouponingModule')
    implementation 'com.google.firebase:firebase-messaging:11.8.0'
    // https://mvnrepository.com/artifact/org.simpleframework/simple-xml
    implementation('org.simpleframework:simple-xml:2.7.1') {
        exclude group: 'stax', module: 'stax-api'
        exclude group: 'xpp3', module: 'xpp3'
    }
}

Answer 1

原因是有些库有类似的依赖关系，所以编译器无法选择合适的。

Answer 2

这可能是因为您正在使用以下内容：

 implementation 'com.google.gms:google-services:3.3.1'

这不是依赖项而是插件。它应该放在你的根目录/项目 build.gradle。像这样：

buildscript {
    repositories {
        jcenter()
        google()
    }
    dependencies {

        classpath 'com.android.tools.build:gradle:3.1.2'
        classpath 'com.google.gms:google-services:3.3.1'

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

程序类型在编译期间已经存在

Program type already present during compile

android

gradle

android-studio-3.0