react-native本地服务器未连接的问题

最近在折腾react-native，首先当然是安装环境，在输入run-native run-android命令后出现大量错误，最后听取季哥的建议，通过利用AndroidStudio的方式来运行，在导入后运行，一开始是出现白色界面，什么都不显示。

后来经过对SDK版本的修改，相关gradle版本的更新，出现如图，显示本地服务器没有连接，打开

打开localhost:8081，，果然本地服务器没有连接，如果连接了（会显示一大段js代码）

然后通过

npm start 打开本地服务器

然后通过Ctrl+ M，Reload，就可以看到运行的结果了（另外要注意index.android.js文件中的类名，文件名要一致，之前就因为这个没注意，运行错误）

最终运行成功，如图：

PS C:\Users\wong\MyProject> react-native run-android

JS server already running.

Running C:\Users\wong\AppData\Local\Android\sdk;/platform-tools/adb -s emul

ator-5554 reverse tcp:8081 tcp:8081

Could not run adb reverse: spawnSync C:\Users\wong\AppData\Local\Android\sd

k;/platform-tools/adb ENOENT

Building and installing the app on the device (cd android && gradlew.bat install

Debug)...

FAILURE: Build failed with an exception.

* What went wrong:

A problem occurred configuring project ':app'.

> The SDK directory 'C:\Users\wong\AppData\Local\Android\sdk;' does not exi

st.

* Try:

Run with --stacktrace option to get the stack trace. Run with --info or --debug

option to get more log output.

BUILD FAILED

Total time: 4.875 secs，

Could not install the app on the device, read the error above for details.

Make sure you have an Android emulator running or a device connected and have

set up your Android development environment:

https://facebook.github.io/react-native/docs/android-setup.html

，