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to the mobile platform using a BasicMessageChannel.
learn more about accessing platform and third-party services
in flutter with platform channels.
here is an example project that shows how to use a
platform channel to access battery state information on
iOS and android.
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does flutter come with a reflection / mirrors system?
no. dart includes dart:mirrors,
which provides type reflection. but since
flutter apps are pre-compiled for production,
and binary size is always a concern with mobile apps,
this library is unavailable for flutter apps.
using static analysis we can strip out anything that isn’t
used (“tree shaking”). if you import a huge dart library
but only use a self-contained two-line method,
then you only pay the cost of the two-line method,
even if that dart library itself imports dozens and
dozens of other libraries. this guarantee is only secure
if dart can identify the code path at compile time.
to date, we’ve found other approaches for specific needs
that offer a better trade-off, such as code generation.
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how do i do international­ization (i18n), localization (l10n), and accessibility (a11y) in flutter?
learn more about i18n and l10n in the
internationalization tutorial.
learn more about a11y in the
accessibility documentation.
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how do i write parallel and/or concurrent apps for flutter?
flutter supports isolates. isolates are separate heaps in
flutter’s VM, and they are able to run in parallel
(usually implemented as separate threads). isolates
communicate by sending and receiving asynchronous messages.
check out an example of using isolates with flutter.
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can i run dart code in the background of a flutter app?
yes, you can run dart code in a background process on both
iOS and android. for more information, see the free medium article
executing dart in the background with flutter plugins and geofencing.
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can i use JSON/XML/protobuffers (and so on) with flutter?
absolutely. there are libraries on
pub.dev for JSON, XML, protobufs,
and many other utilities and formats.
for a detailed writeup on using JSON with flutter,
check out the JSON tutorial.
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can i build 3d (opengl) apps with flutter?
today we don’t support 3d using OpenGL ES or similar.
we have long-term plans to expose an optimized 3d API,
but right now we’re focused on 2d.
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<topic_start>
why is my APK or IPA so big?
usually, assets including images, sound files, fonts, and so on,
are the bulk of an APK or IPA. various tools in the
android and iOS ecosystems can help you understand
what’s inside of your APK or IPA.
also, be sure to create a release build
of your APK or IPA with the flutter tools.
a release build is usually much smaller
than a debug build.
learn more about creating a
release build of your android app,
and creating a release build of your iOS app.
also, check out measuring your app’s size.
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<topic_start>
do flutter apps run on chromebooks?
we have seen flutter apps run on some chromebooks.
we are tracking issues related to running flutter on
chromebooks.
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<topic_start>
is flutter ABI compatible?
flutter and dart don’t offer application binary interface (abi)
compatibility. offering ABI compatibility is not a current
goal for flutter or dart.
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framework
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<topic_start>
why is the build() method on state, rather than StatefulWidget?
putting a widget build(BuildContext context) method on state
rather putting a widget build(BuildContext context, state state)
method on StatefulWidget gives developers more flexibility when
subclassing StatefulWidget. you can read a more
detailed discussion on the API docs for state.build.
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<topic_start>
where is flutter’s markup language? why doesn’t flutter have a markup syntax?
flutter UIs are built with an imperative, object-oriented