In React native 'adb' is not recognized as an internal and external command

问题

I tried to set the path in environmental variables but it doesn't work.

Error like as below: 'adb' is not recognized as an internal or external command, operable program or batch file.Starting the app (C:\Users\Administrator\AppData\Local\Android\Sdk/platform-tool s/adb shell am start -n com.demo/com.demo.MainActivity... Starting: Intent { cmp=com.demo/.MainActivity }

回答1:

First of all you have to set environment variable of your android sdk's platform-tool

Start > Control Panel > System > Advanced System Settings > Environment Variables...

In this Environment Variables window, in the User variables section for (your-username) highlight Path and click Edit...

add this path: C:\Users\your-username\AppData\Local\Android\sdk\platform-tools;

its a default sdk path in windows OS. if you have different location than add your sdk path, than click OK until environment variable popup close.

If you already have a Command Prompt window open, close it then re-open and the adb devices command should then work.

Step 2 :

if its still not work than add local.properties file to your project

1. Go to your React native Project -> Android
2. Create a file local.properties
3. Open the file

4. paste your Android SDK path like below

   in Windows sdk.dir = C:/Users/USERNAME/AppData/Local/Android/sdk

   in macOS sdk.dir = /Users/USERNAME/Library/Android/sdk

   in linux sdk.dir = /home/USERNAME/Android/Sdk

   Replace USERNAME with your user name

Now, Run react-native run-android in your terminal

来源：https://stackoverflow.com/questions/48898079/in-react-native-adb-is-not-recognized-as-an-internal-and-external-command