When you want to work on android development server on your physical devices then first you have to create a rn app
npx create-react-native-app appname //or react-native init appname
After this you can see the android folder
Run the development server
npx react-native start
Now open this android folder into your android studio
Now just run the app on android device
Problem
You can have a Ip issue when you start running this on your physical device .Then you have to run the following command
adb devices // gives the active devices that are ddebugging mode // run this to reverse the port on your android device adb reverse tcp:8081 tcp:8081
If adb is not recognize by your computer then you have to add the location of adb in env of your system
C:\Users\harsh\AppData\Local\Android\Sdk\platform-tools
Disconnected while developing
When your android studio is running and your phone disconnected then just you have to check the react-native server ⇒ then run the adb command⇒then check android Studion and run the app