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- Add android.allow_multiple_resumed_activities meta-data to enable multi-resume on Android 9 (API 28) and Android 10, preventing frame drops and rendering suspension when interacting with another app in split-screen or floating multi-window mode. - Implement onMultiWindowModeChanged to trigger dynamic resolution re-scheduling when entering/exiting multi-window mode. - Avoid force-hiding status and navigation bars while in multi-window mode to preserve split-screen boundaries and car system dock controls. - Add supportsPictureInPicture and ensure resizeableActivity is declared consistently across activities.
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Summary
Support Android Multi-Resume and adaptive multi-window mode to prevent frame drops, rendering pauses, and layout clipping when running CarPlay side-by-side in split screen or floating windows.
Motivation & Problem
In split-screen mode on Android 9 (API 28) and Android 10, when the user touches another application (e.g. car launcher or navigation map), Android transitions
CarPlayHostActivityinto thePAUSEDstate. On many car head units (Qualcomm, MTK, Rockchip BSPs), paused activities suffer compositor frame throttling, Surface buffer starvation, and rendering freezes.Forcibly hiding status and navigation bars inside split screen can corrupt window decorations and cut off the vehicle's system bar / dock controls.
Entering/exiting split screen changes dimensions without activity recreation, requiring stream rescheduling.
Key Changes
<meta-data android:name="android.allow_multiple_resumed_activities" android:value="true" />under<application>inAndroidManifest.xmlto keep both windows in theRESUMEDstate on Android 9/10.applyFullscreenMode(), avoid force-hiding system bars whenisInMultiWindowModeis true.onMultiWindowModeChangedinCarPlayHostActivityto re-apply bars and postscheduleDisplaySize()onvideoView.android:supportsPictureInPicture="true"andandroid:resizeableActivity="true".