当我使用implementation 'com.google.firebase:firebase-inappmessaging-display:17.2.0' in my app/build.gradle，我收到此错误：
Duplicate class com.google.common.util.concurrent.ListenableFuture found in modules guava-20.0.jar (com.google.guava:guava:20.0) and listenablefuture-1.0.jar (com.google.guava:listenablefuture:1.0)
Go to the documentation to learn how to Fix dependency resolution errors.
我的身上也有什么app/build.gradle这是：
implementation 'com.google.android.gms:play-services-base:16.1.0'
implementation 'com.google.android.gms:play-services-analytics:16.0.8'
implementation 'com.google.android.gms:play-services-awareness:16.0.0'
implementation 'com.google.android.gms:play-services-cast:16.2.0'
implementation 'com.google.android.gms:play-services-gcm:16.1.0'
implementation 'com.google.android.gms:play-services-location:16.0.0'
implementation 'com.google.android.gms:play-services-maps:16.1.0'
implementation 'com.google.firebase:firebase-core:16.0.8'
implementation 'com.google.firebase:firebase-iid:17.1.2'
implementation 'com.google.firebase:firebase-messaging:17.6.0'
implementation 'android.arch.work:work-runtime:1.0.1'
implementation 'com.android.support:multidex:1.0.3'
apply plugin: 'com.google.gms.google-services'
也许我正在使用的库之一已经包含对应用程序内消息依赖项的支持，然后它就变得多余了？谢谢。
2020年解决方案
谷歌知道这个错误，所以他们制作了一个特殊的包来解决冲突。
将其添加到您的build.gradle
implementation 'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava'
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