i working on a flutter app. and when it run it goes well. on the mobile phone and the emulater.here is the screenshot,

CodePudding user response：

This might be an issue of build-mode, release/debug. if the apk was built in release mode and there's an issue let's say Null check error A grey screen will be used to hide it i.e. in release mode. This wouldn't be the case for debug mode.

So I suggest you check the logs for any error, exceptions or error you may have ignored in logs.