Am not able to install the APK in my mobile generated by gradle. it's working fine on an emulator but when I try to install on my mobile its starts installing and in the middle, it gives the error APK not installed. Am running android 10. Paths from where I picked the debug APKs are as follow.
<project>/build/app/outputs/apk/debug/app-debug.apk
<project>/build/app/outputs/apk/debug/app.apk
<project>/build/app/outputs/flutter-apk/app-debug.apk
It seems your apk does not have certificate yet. you cant install it just like that. you can either certify it build release android app
or set your phone to install app form unknown source. in app settings or security settings
If you're trying to manually install the app-debug.apk, you should rather consider generating app-release.apk but if you can't debug the app, then you might considering opening up your developer options.