cordova:transformClassesWithDexForReleaseDex:将字节码转换为dex时出错

Question

过去几天我一直在与这个问题作斗争，并尝试了几个建议的修复方法。其中一个，用Jack来说，是有效的，但

1. 使构建所需的时间和内存增加了一倍
2. Jack已被弃用

我还尝试更新CordovaLib/build.gradle中指定的Java版本，但这似乎也不能解决问题。

我运行的是cordova 7.1.0，升级可能不是一个微不足道的选择。和java 1.8.0

观察

以下命令无法生成：

cordova --release build android --device

带有

:transformClassesWithDexForReleaseDex: Error converting bytecode to dex:
Cause: Dex cannot parse version 52 byte code.
This is caused by library dependencies that have been compiled using 
Java 8 or above.
If you are using the 'java' gradle plugin in a library submodule add 
targetCompatibility = '1.7'
sourceCompatibility = '1.7'
to that submodule's build.gradle file.
UNEXPECTED TOP-LEVEL EXCEPTION:
java.lang.RuntimeException: Exception parsing classes
at com.android.dx.command.dexer.Main.processClass(Main.java:775)
at com.android.dx.command.dexer.Main.processFileBytes(Main.java:741)
at com.android.dx.command.dexer.Main.access$1200(Main.java:88)
at com.android.dx.command.dexer.Main$FileBytesConsumer.processFileBytes(Main.java:1683)
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:695)
at com.android.dx.command.dexer.Main.processAllFiles(Main.java:592)
at com.android.dx.command.dexer.Main.runMonoDex(Main.java:321)
at com.android.dx.command.dexer.Main.run(Main.java:292)
at com.android.builder.internal.compiler.DexWrapper.run(DexWrapper.java:54)
at com.android.builder.core.DexByteCodeConverter.lambda$dexInProcess$0(DexByteCodeConverter.java:173)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.android.dx.cf.iface.ParseException: bad class file magic (cafebabe) or version (0034.0000)
at com.android.dx.cf.direct.DirectClassFile.parse0(DirectClassFile.java:476)
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:787)
at com.android.dx.command.dexer.Main.access$1600(Main.java:88)
at com.android.dx.command.dexer.Main$ClassParserTask.call(Main.java:1722)
at com.android.dx.command.dexer.Main.processClass(Main.java:773)
... 16 more

但是，以下内容确实存在：

( cd platforms/android ; ./gradlew cdvBuildRelease -b build.gradle )

在那之后，以下也构建(尽管之前没有(

cordova --release build android --device

最后，如果我清理构建，我会回到它没有构建的状态。

( cd platforms/android ; ./gradlew clean )
cordova --release build android --device

不知道下一步该怎么做才能弄清问题的真相。

Answer 1

你在Gradle构建中尝试过这样更改吗？targetCompatibility="1.7"sourceCompatibility='1.8'

如果你做了一个CLEAN并销毁了所有.class文件，以便它们重新编译为1.7格式，那么你应该很好。

只需确保在如上所示更改Gradle构建中的值后进行清理即可。