I am new to React-Native and android app development as a whole. While i try to run remote debugger in Android Emulator (Pixel 2 phone), I get the following error in the emulator: 
Then after, even if I stop remote debugging, the application won't run on the emulator (i.e. nothing is rendered into the emulator screen). I need to run the project again.
Following is the auto-generated debugger URL: http://10.0.2.2:8081/debugger-ui
How can I Fix this problem?
http://10.0.2.2:8081/debugger-ui This is internal IP the Android VM, with your browser use localhost:8081/debugger-ui reference https://github.com/facebook/react-native/issues/16674#issuecomment-376774645
uninstall your application, then run => react-native run-android in terminal then click debugging end in chrome replace http://localhost:8081/debugger-ui/, end run react-native run-android. if you still haven't succeeded try again
来源：https://stackoverflow.com/questions/49234795/react-native-timeout-when-connecting-to-remote-debugger-in-windows