Duplicate files copied in APK META-INF/license.txt

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今天在尝试使用AndroidAnnotations框架的REST API时，在导入Spring for android包后仅编译的话不会报错，但是当运行时无法编译通过，并报一下错误：

<span style="font-size:18px;">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.txtFile1: C:\Users\sea\.gradle\caches\modules-2\files-2.1\org.springframework.android            \spring-android-rest-template\1.0.1.RELEASE\e132d929bd181941f79b0d63edafb8a86ae6fd33            \spring-android-rest-template-1.0.1.RELEASE.jarFile2: C:\Users\sea\.gradle\caches\modules-2\files-2.1\org.springframework.android            \spring-android-core\1.0.1.RELEASE\e68f0e8e4b636ee30c4de58953be38d9b72a5e3b            \spring-android-core-1.0.1.RELEASE.jar</span>

解决办法是在Model的build.gradle中添加一下内容：

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

与之类似的，可以把完整的加进去

android {        packagingOptions {        exclude 'META-INF/DEPENDENCIES.txt'        exclude 'META-INF/LICENSE.txt'        exclude 'META-INF/NOTICE.txt'        exclude 'META-INF/NOTICE'        exclude 'META-INF/LICENSE'        exclude 'META-INF/DEPENDENCIES'        exclude 'META-INF/notice.txt'        exclude 'META-INF/license.txt'        exclude 'META-INF/dependencies.txt'        exclude 'META-INF/LGPL2.1'    }}

按照stackoverflow上回答的问题原因是：

Almost all OS licence include the obligation to "include a copy of the licence" into your project. So this means, that you have to include a copy of all OS licences you use into you projects. By "excluding" them in gradle, you violate the licences.

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