About React Native unable to link to the simulator

React Native can develop iOS and Android native apps based on the currently popular open source JavaScript library React.js. And React Native is already used in production environments - the Facebook Groups iOS app is developed based on it.

Solution (I):

Go to android/app/build.gradle file and configure it as follows

Using the above method, using r hot update, it shows that the simulator cannot be connected. I guess it's a problem with the Android Studio emulator.
Uninstall Android Studio and delete the entire installation directory and emulator data.
Reinstall Android Studio and create a new emulator.
Re- run the RN project without using the first method for configuration.

I forgot to take a screenshot and will update it next time I encounter this problem.

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