android studio 打包错误:Error:Execution failed for task ':app:transformDexWithDexForRelease'

报错信息如下:

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

> com.android.build.api.transform.TransformException:

com.android.ide.common.process.ProcessException:

java.util.concurrent.ExecutionException:

com.android.dex.DexException:

Multiple dex files define Landroid/support/annotation/AnimRes;

解决方法:

找到本项目下的build.gradle,不是最下面的那个build.gradle,不要找错了

找到defaultConfig ,增加 multiDexEnabled true即可.