Android Studio 报错:unspecified on project app resolves to an APK archive which is not supported解决方案

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现有module A 和module B两个工程,现在把A作为主工程,把B作为library给A来使用。编译之后会报错:

Error:Dependency MaterialDesignTest:mine:unspecified on project app resolves to an APK archive which is not supported as a compilation dependency.

出现该问题的原因如下:

在B工程的build.gradle中出现了语句:

apply plugin: 'com.android.application'
此时,编译器会把module B编译成apk。解决方案是把application换成library,如下:

apply plugin: 'com.android.library'
搞定!

如果module B是在android studio中新建项目,则还需要将defaultConfig下的

applicationId "com.example.mine"
语句删掉。至于原因,因为之前需要把module B编译成application,就需要制定applicationgID。现如今,我们的是把module B作为library来使用,自然不需要画蛇添足的给它制定applicationgID。否则会报如下错误:

Error: Library projects cannot set applicationId. applicationId is set to "XXXXXXXXX" in default config




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