com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex

报错如下：

Error:Execution failed for task ':app:transformDexArchiveWithExternalLibsDexMergerForDebug'.> java.lang.RuntimeException: com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex

项目中出现的原因

同一个依赖项目，多次compile，导致merge dex 失败

具体是这样

compile('com.github.afollestad.material-dialogs:core:0.8.5.2@aar') {
transitive = true
}

然后又依赖同一项目的top version导致

compile 'com.afollestad.material-dialogs:core:0.9.5.0'

要其一即可

还有top version 使用了高compileSDK

要在project的build.gradle加入最新的sdk高版本脚本，强制所有module一律使用高版本

configurations.all {
resolutionStrategy.eachDependency { DependencyResolveDetails details ->
def requested = details.requested
if (requested.group == 'com.android.support') {
if (!requested.name.startsWith("multidex")) {
details.useVersion '27.0.0'
}
}
}
}