React Native 报错：The module `./index.android` could not be found from

一、问题：

新建一个工程后，在执行react-native start 后访问：http://localhost:8081/index.android.bundle?platform=android

报错：

Error: Unable to resolve module `./index.android` from `D:DevelopToolsReactNativeProjectsFirstProject/.`: The module `./index.android` could not be found from `D:DevelopToolsReactNativeProjectsFirstProject/.`. Indeed, none of these files exist:
  * `D:DevelopToolsReactNativeProjectsFirstProjectindex.android(.native||.android.js|.native.js|.js|.android.json|.native.json|.json|.android.ts|.native.ts|.ts|.android.tsx|.native.tsx|.tsx)`
  * `D:DevelopToolsReactNativeProjectsFirstProjectindex.androidindex(.native||.android.js|.native.js|.js|.android.json|.native.json|.json|.android.ts|.native.ts|.ts|.android.tsx|.native.tsx|.tsx)`
    at ModuleResolver.resolveDependency (D:DevelopToolsReactNativeProjectsFirstProject
ode_modulesmetrosrc
ode-hasteDependencyGraphModuleResolution.js:163:15)
    at ResolutionRequest.resolveDependency (D:DevelopToolsReactNativeProjectsFirstProject
ode_modulesmetrosrc
ode-hasteDependencyGraphResolutionRequest.js:52:18)
    at DependencyGraph.resolveDependency (D:DevelopToolsReactNativeProjectsFirstProject
ode_modulesmetrosrc
ode-hasteDependencyGraph.js:283:16)
    at D:DevelopToolsReactNativeProjectsFirstProject
ode_modulesmetrosrclib	ransformHelpers.js:264:42
    at Server.<anonymous> (D:DevelopToolsReactNativeProjectsFirstProject
ode_modulesmetrosrcServer.js:1049:41)
    at Generator.next (<anonymous>)
    at asyncGeneratorStep (D:DevelopToolsReactNativeProjectsFirstProject
ode_modulesmetrosrcServer.js:99:24)
    at _next (D:DevelopToolsReactNativeProjectsFirstProject
ode_modulesmetrosrcServer.js:119:9)

二、解决：

是react native版本更新的一些变动。原来工程中会创建：index.ios.js 和index.android.js，现在只会创建index.js。一个简单的规避方法，就是copy 一份index.js 文件命名为index.android.js即可。

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