Problem: Android project development process, appear as abnormal,
Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
> Failed to create MD5 hash for file……
Reproduce:
Step one, import the relevant jar, tips, and third-party dependent project jar repeat
Error:Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'.
> com.android.build.api.transform.TransformException: com.android.builder.packaging.DuplicateFileException: Duplicate files copied in APK META-INF/LICENSE
File1: D:\Workspaces\……\libs\httpclient-4.3.4.jar
File2: D:\Workspaces\……\libs\httpcore-4.3.2.jar
File3: D:\Workspaces\……\libs\httpmime-4.3.4.jar
Step two, delete the relevant jar directly in the libs in, recompile, the problem described in the error occurs.
Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
> Failed to create MD5 hash for file 'D:\Workspaces\……\libs\httpclient-4.3.4.jar'.
原因：
jar包索引未清理干净，即build.gradle中的包依赖没有删除掉，导致编译器无法查找到删除的文件。
解决办法：
方法一、手动在libs中delete相关jar后，在build.gradle中删除这些文件的依赖说明。
方法二、 File——>Project structure——>module——>app， 选择 “dependencies”。选择你要删除的jar包，按“—”号确认即可。
转载请注明出处：
http://blog.csdn.net/daijin888888/article/details/73849652
