Could not connect to development server

react-native 项目重启后   突然报错    先是红屏

Could not get BatchedBridge, make sure your bundle is packaged correctly

reload之后    

Could not connect to development server

项目启动之后   react-native start ，输入 r  命令行显示

warn No apps connected. Sending "reload" to all React Native apps failed. Make sure your app is running in the simulator or on a phone connected via USB.
info Reloading app...

 

删依赖，清缓存都试了，不行。后来看到  在输端口号  8081；

adb shell input keyevent 82   然后在设置里 settings 里面 找到 DEbug server host & port for device  ,输入了8081；错误更多了

 

后来发现应该输入  IP加端口号    例如 0.0.0.0:8081    重启项目  不报错了