gradle异常总结

修改java jdk 版本为1.8后报如下异常：

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.

解决办法：

在对应module的gradle文件中加上

android {

    defaultConfig {
        ...

        jackOptions {
            enabled true
        }
    }
}

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}