When I first start Android Studio opening an existing project, and click "Run", I get the error message "Error running app, No target device found".
I have my Samsung plugged in and ADB debugging enabled. It correctly shows up with the "adb devices" command and ADB shell works fine. I tried "adb start-server" with no joy. Strangely, If I start 'Debug app' first and then 'Run' it works fine, but I don't understand why this annoying step is necessary. Other Stack Overflow answers said to do "Edit Configurations" but that doesn't show the options suggested. I'm running AS V3.01. Any clue?
I found my problem. Under Run->EditConfigurations->DeploymentTargetOptions, I selected USB Device (my phone is a USB device, right?). But noooo, when I select Open Select Deployment Target Dialog, everything is peachy. Also, checking Use same device for future launches bypasses the dialog entirely and all is good.