Android 打包编译报错：Execution failed for task ‘:mobile:transformClassesAndResourcesWithProguardForRelease’.

我在开发过程中从没有报这个错，但是当我要发布应用的时候突然打包失败，日志并没有指出实在什么地方，只是说找不到类，下面是具体的日志：

Execution failed for task ':mobile:transformClassesAndResourcesWithProguardForRelease'.
...
Caused by: java.lang.RuntimeException: Job failed, see logs for detailsat com.android.build.gradle.internal.transforms.ProGuardTransform.transform(ProGuardTransform.java:209)at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:239)at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:235)at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:102)at com.android.build.gradle.internal.pipeline.TransformTask.transform(TransformTask.java:230)...
Caused by: java.io.IOException: Can't write [D:\lijing\sgreen\mobile\build\intermediates\transforms\proguard\release\0.jar](Can't read [D:\lijing\sgreen\mobile\build\intermediates\javac\release\compileReleaseJavaWithJavac\classes(;;;;;;;**.class)](Can't read [com]  (Can't read [xh] (Can't read [sgreen] (Can't read [BuildConfig.class] (Duplicate jar entry [com/xh/sgreen/a.class]))))))at proguard.OutputWriter.writeOutput(OutputWriter.java:202)...
Caused by: java.io.IOException: Duplicate jar entry [com/xh/sgreen/a.class]at proguard.io.ZipOutput.createOutputStream(ZipOutput.java:155)at proguard.io.ZipOutput.createOutputStream(ZipOutput.java:120)at proguard.io.JarWriter.createOutputStream(JarWriter.java:137)...

一点办法都没有，怎么突然就Can’t read呢？仔细阅读log，发现一只可疑单词Duplicate，提示说 Duplicate jar entry [com/xx/xxxx/a.class],意思就是有多个com/xx/xxxx/a.class,于是项目重头到尾检查一下项目，发现我依赖的一个module的包名和项目的包名一致，抱着试一试的想法，把这个module的包名改成别的，咦！解决了，一头雾水，怎么就可以了，我还不知道为啥？
必须要找到原因，不然咋睡也睡不着。

这是在Stack overflow上找的答案，
Ok, I got the solution.

The Why-

I compared the build steps in gradle console at API22(build OK) and API16(build fails). At API22, the console said-

+Instant Run: Proguard is not compatible with instant run. It has been disabled for debug

+Instant Run: Resource shrinker automatically disabled for debug

…and the build was successful. When i disabled InstantRun, it failed on API22 also.

The Reason-

The problem was in proguard configuration. The BuildConfig.class of coolLib.jar was defined to be kept in proguard-project.txt , so it was keeping all the .class files in that package but BuildConfig.class must be modified at build time according to the Main Project.

The Solution-

I removed that -keep statement and it works like a charm.

此处是源地址

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Android release：transformClassesAndResourcesWithProguardForRelease

Android 打包编译报错：Execution failed for task ‘:mobile:transformClassesAndResourcesWithProguardForRelease’.

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