我用java 7替换java 8 android studio错误？

Question

为什么我用JAVA 7替换JAVA 8，Android studio错误？

> 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:...while parsing android/support/v7/recyclerview/R$attr.class
Error:Error converting bytecode to dex:
Cause: Dex cannot parse version 52 byte code.
This is caused by library dependencies that have been compiled using Java 8 or above.
If you are using the 'java' gradle plugin in a library submodule add 
targetCompatibility = '1.7'
sourceCompatibility = '1.7'
to that submodule's build.gradle file.
Error:...while parsing android/support/v7/recyclerview/R$dimen.class
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:...while parsing android/support/v7/recyclerview/R$id.class
Error:Error converting bytecode to dex:
Cause: Dex cannot parse version 52 byte code.
This is caused by library dependencies that have been compiled using Java 8 or above.  
 If you are using the 'java' gradle plugin in a library submodule add 
targetCompatibility = '1.7'
sourceCompatibility = '1.7'
to that submodule's build.gradle file.
Error:...while parsing android/support/v7/recyclerview/R$styleable.class 
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:...while parsing android/support/v7/recyclerview/R.class
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:...while parsing com/example/administrator/comjarlib/R$anim.class
Error:Error converting bytecode to dex:
............

我想在Android Studio中使用retroLambda。

任何面临类似问题/已解决问题的人都可以给出一些解决问题的建议。

我在2.10年级使用Android Studio 2.1 Preview 3

Answer 1

如果我没有弄错的话，gradle android插件扩展了“java”插件，所以您可以在构建的“android”块中添加这两行。格拉德尔：

apply plugin: 'com.android.application'

android {

    targetCompatibility = '1.7'
    sourceCompatibility = '1.7'

    ...
}

对我来说很好。

Answer 2

这个帮助了我。在项目的主生成中。gradle文件将这些代码行添加到所有项目部分（如果没有，则添加此部分）。

allprojects {

    tasks.withType(JavaCompile) {
        sourceCompatibility = 1.7
        targetCompatibility = 1.7
    }

}