More than one file was found with OS independent path

在运行app时，android studio报如下错误

Error:Execution failed for task ':app:transformResourcesWithMergeJavaResForDebug'.
> More than one file was found with OS independent path 'META-INF/rxjava.properties'

解决方法：在对应的module下，找到defaultConfig项，添加如下配置可解决：

    defaultConfig {
        ...

        packagingOptions {
            exclude 'META-INF/rxjava.properties'
        }
        
        ...
    }