错误 react-native-video：未定义不是对象（评估“RCTVideoInstance.Constants”）答案

【问题标题】：Error react-native-video : undefined is not an object (evaluating 'RCTVideoInstance.Constants')错误 react-native-video：未定义不是对象（评估“RCTVideoInstance.Constants”）
【发布时间】：2020-05-05 13:06:43
【问题描述】：

我想在我的应用中使用 react-native-video。但是，我所做的不起作用：

我使用expo init Project1创建了一个新项目
然后我安装了 react-native-video ：npm install --save react-native-video
我当时用这个：react-native link react-native-video

我目前只有 App.js ：

import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import Video from 'react-native-video';

export default function App() {
  return (
    <View style={styles.container}>
      <Video source={{uri: './small.mp4'}}   // Can be a URL or a local file.
       ref={(ref) => {
         this.player = ref
       }}                                      // Store reference
       o.nBuffer={this.onBuffer}                // Callback when remote video is buffering
       onError={this.videoError}               // Callback when video cannot be loaded
       style={styles.backgroundVideo} />

    </View>
  );
}

最后我用npm start

我有这个错误信息：

undefined is not an object (evaluating 'RCTVideoInstance.Constants')

Stack trace:
  node_modules/react-native-video/Video.js:265:11 in render
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:13042:21 in finishClassComponent
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:12970:4 in updateClassComponent
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:307:15 in invokeGuardedCallbackImpl
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:531:36 in invokeGuardedCallback
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:20488:8 in beginWork$$1
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:19370:24 in performUnitOfWork
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:19347:39 in workLoopSync
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:18997:22 in renderRoot
  [native code]:null in renderRoot
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:18709:28 in runRootCallback
  [native code]:null in runRootCallback
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:5642:32 in runWithPriority$argument_1
  node_modules/scheduler/cjs/scheduler.development.js:643:23 in unstable_runWithPriority
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:5638:22 in flushSyncCallbackQueueImpl
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:5627:28 in flushSyncCallbackQueue
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:18556:30 in scheduleUpdateOnFiber
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:21822:15 in scheduleRootUpdate
  node_modules/react-native/Libraries/Renderer/implementations/ReactNativeRenderer-dev.js:23042:20 in ReactNativeRenderer.render
  node_modules/react-native/Libraries/ReactNative/renderApplication.js:52:52 in renderApplication
  node_modules/react-native/Libraries/ReactNative/AppRegistry.js:116:10 in runnables.appKey.run
  node_modules/react-native/Libraries/ReactNative/AppRegistry.js:197:26 in runApplication
  node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:436:47 in __callFunction
  node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:111:26 in __guard$argument_0
  node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:384:10 in __guard
  node_modules/react-native/Libraries/BatchedBridge/MessageQueue.js:110:17 in __guard$argument_0
  [native code]:null in callFunctionReturnFlushedQueue
  ...

我按照 react-native-video 的说明进行操作：https://www.npmjs.com/package/react-native-video

非常感谢...

【问题讨论】：

标签： react-native react-native-video

【解决方案1】：

如果您想使用“react-native-video”，您必须从 expo 中退出您的应用并使用裸工作流。

顺便说一句，您可以使用 Expo Video 代替 react-native-video ：https://docs.expo.io/versions/latest/sdk/video/

【讨论】：