Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.

1.Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.

原因解析：

gradle 從 2.14.1 升級至 3.5.1

react-native 混淆壓縮處理失敗

2.解決方案

在 android/app/proguard-rules.pro 中添加 

-ignorewarnings -keep class * { public private *; }