Reported: with Android Auto connected, the car screen sometimes came up
completely BLACK, and opening the app on the phone then showed a
completely WHITE screen until the app was force-killed and reopened.
Never without Android Auto.
The user guessed portrait-only plus a landscape phone made the app "go a
bit crazy". Right file and right trigger, different mechanism -- a broken
layout renders overflow stripes or a red error box, never white. White
means nothing was ever built, so runApp had not run.
Verified in the plugin source: AudioServiceActivity.provideFlutterEngine
returns AudioServicePlugin.getFlutterEngine(context), which CREATES the
engine and executes the Dart entrypoint the first time it is asked. When
the car binds the MediaBrowserService before the app is opened, that
first ask is the service -- so main() runs HEADLESS, with no Activity.
SystemChrome.setPreferredOrientations travels the flutter/platform
channel, whose handler (PlatformPlugin) is installed by the Activity.
Headless there is nobody to answer it, so the call throws
MissingPluginException or never settles. It was the FIRST await in
main(), which made it fatal twice over: registrarFuenteNavegacion sits
below it and never ran, leaving getChildren with no source (black car
screen), and runApp was never reached. Opening the app then reused that
same cached, already-dead engine -- white screen. Only a force-kill,
which disposes the cached engine, recovered it. That is exactly the
workaround that was reported, and it is what makes the diagnosis fit
every detail rather than most of them.
Three changes, smallest first:
- The Android Auto browse registration moves above every await. It
depends on nothing, and anything before it is a place to get stuck.
- The orientation call is no longer awaited. It is a display preference,
never a prerequisite for runApp, and _OrientacionResponsiveApp already
re-applies it in didChangeDependencies -- the only moment it can take
effect anyway.
- aplicarPoliticaOrientacion swallows everything and logs, so the
headless failure can never propagate again.
The policy itself is unchanged and now pure and tested
(orientacionesPara): phones portrait, >=600dp everything.
Tests: 1141 -> 1146.
FreeTLab
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