mac 跑 Android studio 3.0+

报错：java.lang.RuntimeException: Unexpected exception in dex writer thread

Error:Error converting bytecode to dex:
Cause: java.lang.RuntimeException: Unexpected exception in dex writer thread
Error:Execution failed for task ':app:transformClassesWithDexForLoopFormalRelease'.
> com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: Error while executing java process with main class com.android.dx.command.Main with arguments {--dex --num-threads=4 --multi-dex --main-dex-list /Users/leon/work_space/project_android/project_official/LoopOverseaAndriod/app/build/intermediates/multi-dex/loopFormal/release/maindexlist.txt --output /Users/leon/work_space/project_android/project_official/LoopOverseaAndriod/app/build/intermediates/transforms/dex/loopFormal/release/0 --min-sdk-version 15 /Users/leon/work_space/project_android/project_official/LoopOverseaAndriod/app/build/intermediates/transforms/proguard/loopFormal/release/0.jar}

解决方法

在工程根目录下新建一个 gradle.properties 文件。与settings.gradle 同一个层级。
内容：

org.gradle.jvmargs=-Xmx4096m -XX\:MaxPermSize\=4096m -XX\:+HeapDumpOnOutOfMemoryError -Dfile.encoding\=UTF-8
org.gradle.daemon=true
org.gradle.configureondemand=true
org.gradle.parallel=true

android.useDeprecatedNdk=true