添加Firebase依赖项后Gradle同步失败：在打包APK期间重复文件

Question

添加Firebase依赖项似乎打破了默认Android Studio项目的Gradle构建。这是我做的：

1. 我在Android Studio中创建了一个新的默认Android应用。它开箱即用。

2. 我将Firebase Gradle依赖项添加到app/build.gradle文件中：

   ...
   dependencies {
       compile fileTree(dir: 'libs', include: ['*.jar'])
       compile 'com.firebase:firebase-client:1.0.16+'
   }
   

3. Gradle同步已突破此错误：

   Error:duplicate files during packaging of APK /Users/mimming/code/firebase-rawr/app/build/outputs/apk/app-debug-unaligned.apk
       Path in archive: META-INF/LICENSE
       Origin 1: /Users/me/.gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-annotations/2.2.2/stuff/jackson-annotations-2.2.2.jar
       Origin 2: /Users/me/.gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-databind/2.2.2/stuff/jackson-databind-2.2.2.jar
   

Answer 1

这是由Gradle处理依赖项的错误引起的。它在Android OSP bug tracker中被跟踪。

您可以通过在app/build.gradle文件中添加几个排除项来解决Firebase的此错误：

android {
    packagingOptions {
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/NOTICE'
    }
...
}