在我的项目中使用jar时出错 [英] Error when using a jar in my project

问题描述

我使用Java 1.8来创建我的jar。

I use Java 1.8 to create my jar.

我可以在Java项目中使用它，但在Android项目中，我有以下错误：

I can use it in a Java project, but in an Android project, I have the following error:

Error: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.
Error:1 error; aborting
Error:Execution failed for task ':app:transformClassesWithDexForDebug'.
> com.android.build.api.transform.TransformException: java.lang.RuntimeException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'E:\Android-tool\JAVA\jdk1.8.0_77\bin\java.exe'' finished with non-zero exit value 1
Information:BUILD FAILED
Information:Total time: 6.468 secs
Information:3 errors
Information:0 warnings
Information:See complete output in console

推荐答案

如果是多应用程序项目中的Java库，请使用下面提到的代码在库的build.gardle文件中。

In case of a Java library in a multi-app project, use code mentioned bellow in the library's build.gardle file.

apply plugin: 'java'
sourceCompatibility = JavaVersion.VERSION_1_7
targetCompatibility = JavaVersion.VERSION_1_7
compileJava.options.bootClasspath = "D:/android/sdk/platforms/android-23/android.jar"
...
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
...
}

您需要使用本地路径更改 compileJava.options.bootClasspath 到android.jar文件。这适用于Win10中的AS 2.2。
以获取更多参考资料，请访问 here

You will need to change compileJava.options.bootClasspath with your local path to android.jar file. This works for me in AS 2.2 on Win10. for more references please visit here

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