Adb install failed

Question

I\'am developing an android app. before this morning everythings ok when i click \'run\' in Android Studio, the IDE will compile my codes and install apk to my devices automatic

Answer 1

Looks like you are trying to install a debug app with adb. Debug APK file is signed with debug Keystore and wont be installed with adb. You need to sign your app. go to link below, generate a Keystore and build your APK file with that Keystore file. guide to sign your app

Don't lose your Keystore file and passwords and try to protect it because you will need it later for updates.