Locate MainActivity Java or Kotlin file in Android Studio.AVD Pixel_2_API_15 is already running.Instant Run requires Tools | Android | Enable ADB integration to be enabled.

You can also try to kill the adb services under Task Manager (Activity Monitor if on Mac OS X) and try. If none of the above works for you!! Then try to reboot your device, or if on emulator, close it and re-launch. Now try to run the Application, it should work without throwing any console errors!.Now look for Text field : ADB connection time out (ms):, change the value from default 5000 to say 15000.Go to Menu : Window (on Windows OS, else Eclipse -> Preferences if on Mac OS X).If the above solution does not work for you then you must try to change the default ADB connection timeout value i.e. Try to run the App, it should get uploaded.If you are getting the above error message in the Android ADT Eclipse console when you are trying to run your Android Project either on the emulator or the device, then its because the apk file is not being got uploaded on the device and a timeout has occurred! This is the most common error encountered while working with ADT Solution :

Adroid emulator mac apk