android studio can't debug via usb

Question

i try to debug my android app via usb,

and first time i run it works perfectly,

but i close android studio and restart again,it reports

(i checked usb debug option is open)

12/12 23:48:42: Launching 'app' on HUAWEI VTR-AL00.
$ adb shell am start -n "com.example.onhw/com.example.onhw.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Error while executing: am start -n "com.example.onhw/com.example.onhw.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.onhw/.MainActivity }
Error type 3
Error: Activity class {com.example.onhw/com.example.onhw.MainActivity} does not exist.

Error while Launching activity

but it still works on virtual device

can anyone give some advices?

my phone is HUAWEI P10

yes,and it works on first install,but when i restart android studio,it suddenly failed — ratsafalig, Dec 12 '19 at 16:01
I think HUAWEI P10 has some issues if you google like https://forum.xda-developers.com/p10-lite/help/usb-debugging-problem-t3704435.. did you tried to run on other devices ? — Wini, Dec 12 '19 at 16:02
sry,my mistake........,i found it works on other phone and dont work on P10,mybe it is something woring with P10 system — ratsafalig, Dec 12 '19 at 16:39

score 0 · Answer 1 · answered Dec 12 '19 at 17:24

finally i found it was huawei's system causing the problem

because in debug mode,even i uninstall the application,it still remain the debug-signature of the application,but android use signature to tell if a app has been installed

so when i try to debug this app again,the debug-signature is still in the system so it can't be install

sovling way:

is to use adb.exe which in Sdk/platform-tools/adb.exe and executeadb uninstall com.example.application to totally remove the debug-signature

android studio can't debug via usb

1 Answers1