Incallui - [top]

Now, your Android tablet can show an InCallUI for a call active on your phone. This is implemented via a new InCallService extension that proxies touch events (mute, speaker) back to the phone over Bluetooth LE.

The InCallUI activity requires an absurdly fast start-up time. Telecom starts a "warm-up" process pre-emptively. If your InCallActivity takes longer than ~200ms to inflate its layout or bind to InCallService , the system times out. The call connects, but the UI never appears. incallui

Use adb shell dumpsys telecom and look for InCallController . If you see mIsBound = false while a call is active, your UI has crashed silently. Customizing InCallUI (The Right Way) Let’s say you're building a VoIP app (like WhatsApp or Signal). You don't want to replace the system dialer. You want your own call screen inside your app. Now, your Android tablet can show an InCallUI