Rotating with native video on shows the previous frame flashing in what become
the letterbox bars. It reads as a TextureView artefact — the view retains its
last frame, so between the rotation and fitSurfaceToScreen() landing that frame
sits at the old size — and two fixes were built on that reading:
1. reveal after two postOnAnimation hops. An animation frame is not a video
frame; at 24fps the next decoded frame can be several vsyncs away.
2. reveal on onSurfaceTextureUpdated, i.e. when a real frame lands. This meant
owning the SurfaceTextureListener and handing ExoPlayer the Surface directly
instead of via setVideoTextureView, which installs its own and leaves us
blind to frame arrival.
Neither stopped the flash. The mechanism is the WINDOW's rotation animation:
Android cross-fades a screenshot of the old orientation, that screenshot holds
the old video frame at the old size, and nothing at the TextureView level can
reach it. The app cannot pre-empt the screenshot either — onConfigurationChanged
fires after it is taken.
So the animation itself has to go: ROTATION_ANIMATION_JUMPCUT. That was accepted
and silently ignored, and the platform said why out loud —
"VRI[MainActivity]: setLayoutParams: not fullscreen" — because the attribute is
honoured only for a fullscreen window. FLAG_FULLSCREEN is therefore set with it,
scoped to while native compositing is active so the rest of the app keeps its
normal animation. After the change that complaint is gone from logcat.
The frame-arrival reveal is kept: it replaces a fixed-timeout guess with a real
signal, and its timeout is required rather than defensive — a resize while paused
means no new frame is ever coming, and revealing a stale frame beats a
permanently black player.
NOT CONFIRMED FIXED on device. The forced-rotation harness
(settings put system user_rotation) proved unreliable here, and screenrecord
fixes its canvas at start, so a rotation inside a recording never changes frame
dimensions — which defeated two separate attempts to measure this. DR-194 is
recorded as "Needs device verification" rather than Done.
dtourolle
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