text stringlengths 1 474 |
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<topic_end> |
<topic_start> |
Performance |
Platform views in Flutter come with performance trade-offs.For example, in a typical Flutter app, the Flutter UI is |
composed on a dedicated raster thread. |
This allows Flutter apps to be fast, |
as the main platform thread is rarely blocked.When a platform view is rendered with hybrid composition, |
the Flutter UI is composed from the platform thread. |
The platform thread competes with other tasks |
like handling OS or plugin messages.When an iOS PlatformView is on screen, the screen refresh rate is |
capped at 80fps to avoid rendering janks.For complex cases, there are some techniques that can be used |
to mitigate performance issues.For example, you could use a placeholder texture while an |
animation is happening in Dart. |
In other words, if an animation is slow while a platform view is rendered, |
then consider taking a screenshot of the native view and rendering it as a texture.<topic_end> |
<topic_start> |
Composition limitations |
There are some limitations when composing iOS Platform Views. |
<topic_end> |
<topic_start>iOS debugging |
Due to security around |
local network permissions in iOS 14 or later, |
you must accept a permission dialog box to enable |
Flutter debugging functionalities such as hot-reload |
and DevTools.This affects debug and profile builds only and won’t |
appear in release builds. You can also allow this |
permission by enabling |
Settings > Privacy > Local Network > Your App. |
<topic_end> |
<topic_start>Restore state on iOS |
When a user runs a mobile app and then selects another |
app to run, the first app is moved to the background, |
or backgrounded. The operating system (both iOS and Android) |
often kill the backgrounded app to release memory or |
improve performance for the app running in the foreground.You can use the RestorationManager (and related) |
classes to handle state restoration. |
An iOS app requires a bit of extra setup in Xcode, |
but the restoration classes otherwise work the same on |
both iOS and Android.For more information, check out State restoration on Android |
and the VeggieSeasons code sample. |
<topic_end> |
<topic_start>Linux |
<topic_end> |
<topic_start> |
Topics |
<topic_end> |
<topic_start>Add Linux devtools for Flutter |
To choose the guide to add Linux devtools to your Flutter configuration, |
click the Getting Started path you followed. |
<topic_end> |
<topic_start>Building Linux apps with Flutter |
This page discusses considerations unique to building |
Linux apps with Flutter, including shell integration |
and preparation of apps for distribution.<topic_end> |
<topic_start> |
Integrating with Linux |
The Linux programming interface, |
comprising library functions and system calls, |
is designed around the C language and ABI. |
Fortunately, Dart provides dart:ffi, |
which is designed to enable Dart programs |
to efficiently call into C libraries. |
FFI provides Flutter apps with the ability to |
allocate native memory with malloc or calloc, |
support for pointers, structs and callbacks, |
and ABI types like long and size_t.For more information about calling C libraries |
from Flutter, see C interop using dart:ffi.Many apps will benefit from using a package that |
wraps the underlying library |
calls in a more convenient, idiomatic Dart API. |
Canonical has built a series of packages |
with a focus on enabling Dart and Flutter on Linux, |
including support for desktop notifications, |
dbus, network management, and Bluetooth.More generally, many other packages support Linux, |
including common packages such as url_launcher, |
shared_preferences, file_selector, and |
path_provider.<topic_end> |
<topic_start> |
Preparing Linux apps for distribution |
The executable binary can be found in your project under |
build/linux/<build mode>/bundle/. Alongside your |
executable binary in the bundle directory there are |
two directories:In addition to these files, your application also |
relies on various operating system libraries that |
it’s been compiled against. |
You can see the full list by running ldd |
against your application. For example, |
assuming you have a Flutter desktop application |
called linux_desktop_test, you could inspect |
the system libraries it depends upon as follows:To wrap up this application for distribution |
you need to include everything in the bundle directory, |
and make sure the Linux system you are installing |
it on has all of the system libraries required. |
This could be as simple as:For information on publishing a Linux application |
to the Snap Store, see |
Build and release a Linux application to the Snap Store. |
<topic_end> |
<topic_start>macOS |
<topic_end> |
<topic_start> |
Topics |
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