Displaying minimized call notifications if you are using other apps (like gaming or watching videos) during a conversation. Manufacturer Variations
Here's a basic example of how the In-Call UI feature can be implemented in Android: incallui
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. Displaying minimized call notifications if you are using
If you decompile SamsungInCallUI.apk , you'll find: incallui
While stock Android has its own version, many manufacturers customize the package to fit their design language:
public CallInfoCard(Context context) { super(context); init(context); }