我在Android studio中生成签名的Apk文件时遇到问题。我在下面收到一条消息：
Error:Error converting bytecode to dex:
Cause: java.lang.RuntimeException: Exception parsing classes
Error:1 error; aborting
:app:transformClassesWithDexForRelease FAILED
Error:Execution failed for task ':app:transformClassesWithDexForRelease'.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.7.0_67\bin\java.exe'' finished with non-zero exit value 1
我在build gradle中使用proguard：
classpath 'com.android.tools.build:gradle:2.1.0'
我正在搜索许多现有的答案，但它没有奏效。 我引用this topic，但我找不到这样的东西。
尝试使用gradlew assembleRelease时，我会找到以下消息：
Cause: java.lang.RuntimeException: Exception parsing classes
UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.RuntimeException: Exception parsing classes
at com.android.dx.command.dexer.Main.processClass(Main.java:761)
at com.android.dx.command.dexer.Main.processFileBytes(Main.java:727)
at com.android.dx.command.dexer.Main.access$1200(Main.java:87)
at com.android.dx.command.dexer.Main$FileBytesConsumer.processFileBytes(Main.java:1655)
at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:284)
at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:166)
at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144)
at com.android.dx.command.dexer.Main.processOne(Main.java:681)
at com.android.dx.command.dexer.Main.processAllFiles(Main.java:578)
at com.android.dx.command.dexer.Main.runMonoDex(Main.java:315)
at com.android.dx.command.dexer.Main.run(Main.java:286)
at com.android.builder.internal.compiler.DexWrapper.run(DexWrapper.java:52)
at com.android.builder.core.AndroidBuilder$2.call(AndroidBuilder.java:1511)
at com.android.builder.core.AndroidBuilder$2.call(AndroidBuilder.java:1507)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.android.dx.cf.iface.ParseException: name already added: string{"a"}
at com.android.dx.cf.direct.AttributeListParser.parse(AttributeListParser.java:156)
at com.android.dx.cf.direct.AttributeListParser.parseIfNecessary(AttributeListParser.java:115)
at com.android.dx.cf.direct.AttributeListParser.getEndOffset(AttributeListParser.java:96)
at com.android.dx.cf.direct.MemberListParser.parse(MemberListParser.java:213)
at com.android.dx.cf.direct.MemberListParser.parseIfNecessary(MemberListParser.java:108)
at com.android.dx.cf.direct.FieldListParser.getList(FieldListParser.java:54)
at com.android.dx.cf.direct.DirectClassFile.parse0(DirectClassFile.java:536)
at com.android.dx.cf.direct.DirectClassFile.parse(DirectClassFile.java:406)
at com.android.dx.cf.direct.DirectClassFile.parseToInterfacesIfNecessary(DirectClassFile.java:388)
at com.android.dx.cf.direct.DirectClassFile.getMagic(DirectClassFile.java:251)
at com.android.dx.command.dexer.Main.parseClass(Main.java:773)
at com.android.dx.command.dexer.Main.access$1600(Main.java:87)
at com.android.dx.command.dexer.Main$ClassParserTask.call(Main.java:1694)
at com.android.dx.command.dexer.Main.processClass(Main.java:758)
... 17 more
Caused by: java.lang.IllegalArgumentException: name already added: string{"a"}
at com.android.dx.rop.annotation.Annotation.add(Annotation.java:208)
at com.android.dx.cf.direct.AnnotationParser.parseAnnotation(AnnotationParser.java:264)
at com.android.dx.cf.direct.AnnotationParser.parseAnnotations(AnnotationParser.java:223)
at com.android.dx.cf.direct.AnnotationParser.parseAnnotationAttribute(AnnotationParser.java:152)
at com.android.dx.cf.direct.StdAttributeFactory.runtimeVisibleAnnotations(StdAttributeFactory.java:632)
at com.android.dx.cf.direct.AnnotationParser.parseAnnotations(AnnotationPa
at com.android.dx.cf.direct.AnnotationParser.parseAnnotationAttribute(Anno
at com.android.dx.cf.direct.StdAttributeFactory.runtimeVisibleAnnotations(
at com.android.dx.cf.direct.StdAttributeFactory.parse0(StdAttributeFactory
at com.android.dx.cf.direct.AttributeFactory.parse(AttributeFactory.java:9
at com.android.dx.cf.direct.AttributeListParser.parse(AttributeListParser.
... 30 more
1 error; aborting
:app:transformClassesWithDexForRelease FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:transformClassesWithDexForRelease'.
> com.android.build.api.transform.TransformException: com.android.ide.common.proce
s.ProcessException: Return code 1 for dex process
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug op
BUILD FAILED
我尝试创建新项目并复制所有gradle，proguard-pro并且构建正常。 我不知道为什么？ 请问其他可能的解决方案是什么？