Android Incallui [work] -

| Component | Function | | :--- | :--- | | | System service managing all calls (including VoIP like WhatsApp). | | InCallService API | A binder interface allowing any dialer app to draw the call screen. | | InCallUI (AOSP) | The default Google implementation. | | Carrier/OEM Overlays | Samsung’s One UI, Xiaomi’s MIUI, or Google Pixel’s skin on top. |

It appears every time you make or receive a call. It displays the contact name, the duration, the mute button, and the dreaded red "end" icon. But behind those familiar touch targets lies one of the most complex, security-sensitive, and historically problematic modules in the Android Open Source Project (AOSP): . android incallui

Next time you mute a conference line or switch to speakerphone, remember: you are interacting with one of Android’s oldest, most patched, and most resilient system UIs. Have you encountered a bizarre InCallUI bug? Share your story in the comments. | Component | Function | | :--- |

Here is a deep dive into the architecture, evolution, and hidden intelligence of the Android call screen. In technical terms, InCallUI is a system application ( com.android.dialer.incallui ) responsible for the in-call screen. It is not the dialer. While the Dialer app handles number input and search, the InCallUI takes over the moment the telephony stack answers a ringing event. | | Carrier/OEM Overlays | Samsung’s One UI,