Android studio 3.4 does not launch app on run

Question

I installed Android Studio 3.4 on a new laptop (Macbook), and running the app configuration now only installs the APK, but does not run the specified Activity.

• The Activity is marked as android.intent.action.MAIN and android.intent.category.LAUNCHER
• The Run configuration is set up to launch the Default activity. Also tried specifying the exact Activity to run, no use.
• As per some other S/O threads, tried disabling Instant run, that did not help.
• Launching the Activity through adb works - am start -n cz.melkamar.pkg/cz.melkamar.pkg.MainActivity
• Tried downgrading to AS 3.3.2, still nothing.
• Created a fresh project, running that still did not launch the default Activity

I'm at a loss, any idea which settings/configs I should look at?

Answer 1

As Emmanuel suggested in a comment, the reason was that the Videostream app was clashing with the same port. Uninstalling it solved my issue.

Source link: Cannot launch the app - "Emulator-5556 [DISCONNECTED]" keeps appearing and disappearing