删除你手机上的App !我尝试了几个步骤，但最终还是成功了。

If you tried to run your app before but failed, delete it from your android device. Run $ react-native run-android Open the React Rage Shake Menu from within your app on your android device, go to Dev Settings and then to Debug server host & port for device. There enter your server IP (IP of your computer) and host 8081, e.g. 192.168.50.35:8081. On a mac you can find the IP of your computer at System Preferences -> Network -> Advanced... -> TCP/IP -> IPv4 Address. Open the Rage Shake Menu again and click Reload JS.

删除你手机上的App !我尝试了几个步骤，但最终还是成功了。

If you tried to run your app before but failed, delete it from your android device. Run $ react-native run-android Open the React Rage Shake Menu from within your app on your android device, go to Dev Settings and then to Debug server host & port for device. There enter your server IP (IP of your computer) and host 8081, e.g. 192.168.50.35:8081. On a mac you can find the IP of your computer at System Preferences -> Network -> Advanced... -> TCP/IP -> IPv4 Address. Open the Rage Shake Menu again and click Reload JS.

从项目目录中运行

react-native start

输出如下:

$ react-native start
 ┌────────────────────────────────────────────────────────────────────────────┐ 
 │  Running packager on port 8081.                                            │ 
 │                                                                            │ 
 │  Keep this packager running while developing on any JS projects. Feel      │ 
 │  free to close this tab and run your own packager instance if you          │ 
 │  prefer.                                                                   │ 
 │                                                                            │ 
 │  https://github.com/facebook/react-native                                  │ 
 │                                                                            │ 
 └────────────────────────────────────────────────────────────────────────────┘ 
Looking for JS files in
   /home/user/AwesomeProject 


React packager ready.

[11:30:10 PM] <START> Building Dependency Graph
[11:30:10 PM] <START> Crawling File System
[11:30:16 PM] <END>   Crawling File System (5869ms)
[11:30:16 PM] <START> Building in-memory fs for JavaScript
[11:30:17 PM] <END>   Building in-memory fs for JavaScript (852ms)
[11:30:17 PM] <START> Building in-memory fs for Assets
[11:30:17 PM] <END>   Building in-memory fs for Assets (838ms)
[11:30:17 PM] <START> Building Haste Map
[11:30:18 PM] <START> Building (deprecated) Asset Map
[11:30:18 PM] <END>   Building (deprecated) Asset Map (220ms)
[11:30:18 PM] <END>   Building Haste Map (759ms)
[11:30:18 PM] <END>   Building Dependency Graph (8319ms)

此错误可以通过以下步骤轻松解决:

    //run the command at /android sdk / platforms-tool folder
        adb reverse tcp:8081 tcp:8081

    //now come to root folder of your app
    1. npm start
    2. create 'assets' folder inside rootApp/android/app/src/main/
    3. curl "http://localhost:8081/index.android.bundle?platform=android" -o "android/app/src/main/assets/index.android.bundle"
    4. make sure anyone physical or virtual device attached is running.
    5. react-native run-android

一个更新

现在在windows上不需要运行react-native start。打包程序将自动运行。

以下是我在Ubuntu 14.04上使用它的方法:

cd (App Dir)
react-native start > /dev/null 2>&1 &
adb reverse tcp:8081 tcp:8081

更新:看

在设备上运行(Android) 设备警告被抑制?

更新2:@scgough我们得到这个错误，因为React Native (RN)无法从运行在我们工作站上的开发服务器获取JavaScript。你可以看到为什么会这样:

https://github.com/facebook/react-native/blob/42eb5464fd8a65ed84b799de5d4dc225349449be/ReactAndroid/src/main/java/com/facebook/react/devsupport/DevServerHelper.java#L116-L137

如果您的RN应用程序检测到您正在使用Genymotion或模拟器，它会尝试从GENYMOTION_LOCALHOST(10.0.3.2)或EMULATOR_LOCALHOST(10.0.2.2)中获取JavaScript。 否则，它假定您正在使用一个设备，并尝试从DEVICE_LOCALHOST (localhost)获取JavaScript。 问题是开发服务器运行在你的工作站的本地主机上，而不是设备的，所以为了让它工作，你需要:

从(设备的localhost):8081/tcp到(工作站的localhost):8081/tcp的转发流量。这就是adb命令的作用。 告诉您的RN应用程序在哪里可以找到您的开发服务器。