targetCompatibility = '1.7' sourceCompatibility = '1.7'

ANDROID STUDIO报错：

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
:app:transformClassesWithDexForDebug FAILED

Error:Execution failed for task ':app:transformClassesWithDexForDebug'.

 

解决：

app的build.gradle文件中：

android节点增加：

compileOptions{
        sourceCompatibility org.gradle.api.JavaVersion.VERSION_1_8
        targetCompatibility org.gradle.api.JavaVersion.VERSION_1_8
    }

在 defaultcoding节点增加：

jackOptions{
            enabled true
        }

 

 

还不行的话：

在工程根目录的build.gradle中：

allprojects节点增加：

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