But what exactly is this "extended key"? It is not a single button or a standalone command. It is a conceptual framework of advanced flags, intent filters, and permission modifiers that extend ADB’s native app control package manager (PM) functions.
These control the audio stream regardless of the foreground app, though the specific stream (Media, Ringtone, Call) depends on the context. adb app control extended key
Click the button, paste your key into the box, and click OK . But what exactly is this "extended key"