Ekhlass/Flutter_Documentation · Datasets at Hugging Face

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as the compiler can no longer assume that the call is always static.<topic_end>
<topic_start>
Resources
For more performance info, check out the following resources:
<topic_end>
<topic_start>Measuring your app's size
Many developers are concerned with the size of their compiled app.
As the APK, app bundle, or IPA version of a Flutter app is
self-contained and holds all the code and assets needed to run the app,
its size can be a concern. The larger an app,
the more space it requires on a device,
the longer it takes to download,
and it might break the limit of useful
features like Android instant apps.<topic_end>
<topic_start>
Debug builds are not representative
By default, launching your app with flutter run,
or by clicking the Play button in your IDE
(as used in Test drive and
Write your first Flutter app),
generates a debug build of the Flutter app.
The app size of a debug build is large due to
the debugging overhead that allows for hot reload
and source-level debugging. As such, it is not representative of a production
app end users download.<topic_end>
<topic_start>
Checking the total size
A default release build, such as one created by flutter build apk or
flutter build ios, is built to conveniently assemble your upload package
to the Play Store and App Store. As such, they’re also not representative of
your end-users’ download size. The stores generally reprocess and split
your upload package to target the specific downloader and the downloader’s
hardware, such as filtering for assets targeting the phone’s DPI, filtering
native libraries targeting the phone’s CPU architecture.<topic_end>
<topic_start>
Estimating total size
To get the closest approximate size on each platform, use the following
instructions.<topic_end>
<topic_start>Android
Follow the Google Play Console’s instructions for checking app download and
install sizes.Produce an upload package for your application:Log into your Google Play Console. Upload your application binary by drag
dropping the .aab file.View the application’s download and install size in the Android vitals ->
App size tab.The download size is calculated based on an XXXHDPI (~640dpi) device on an
arm64-v8a architecture. Your end users’ download sizes might vary depending on
their hardware.The top tab has a toggle for download size and install size. The page also
contains optimization tips further below.<topic_end>
<topic_start>iOS
Create an Xcode App Size Report.First, by configuring the app version and build as described in the
iOS create build archive instructions.Then:Sign and export the IPA. The exported directory contains
App Thinning Size Report.txt with details about your projected
application size on different devices and versions of iOS.The App Size Report for the default demo app in Flutter 1.17 shows:In this example, the app has an approximate
download size of 5.4 MB and an approximate
installation size of 13.7 MB on an iPhone12,1 (Model ID / Hardware
number for iPhone 11)
and iPhone11,8 (iPhone XR) running iOS 13.0.To measure an iOS app exactly,
you have to upload a release IPA to Apple’s
App Store Connect (instructions)
and obtain the size report from there.
IPAs are commonly larger than APKs as explained
in How big is the Flutter engine?, a
section in the Flutter FAQ.<topic_end>
<topic_start>
Breaking down the size
Starting in Flutter version 1.22 and DevTools version 0.9.1,
a size analysis tool is included to help developers understand the breakdown
of the release build of their application.warning Warning
As stated in the checking total size section
above, an upload package is not representative of your end users’ download
size. Be aware that redundant native library architectures and asset densities
seen in the breakdown tool can be filtered by the Play Store and App Store.The size analysis tool is invoked by passing the --analyze-size flag when
building:This build is different from a standard release build in two ways.In addition to analyzing a single build, two builds can also be diffed by
loading two -code-size-analysis_.json files into DevTools. See
DevTools documentation for details.Through the summary, you can get a quick idea of the size usage per category
(such as asset, native code, Flutter libraries, etc). The compiled Dart
native library is further broken down by package for quick analysis.warning Warning
This tool on iOS creates a .app rather than an IPA. Use this tool to
evaluate the relative size of the .app’s content. To get
a closer estimate of the download size, reference the
Estimating total size section above.<topic_end>
<topic_start>
Deeper analysis in DevTools
The -code-size-analysis_.json file produced above can be further
analyzed in deeper detail in DevTools where a tree or a treemap view can
break down the contents of the application into the individual file level and
up to function level for the Dart AOT artifact.This can be done by flutter pub global run devtools, selecting
Open app size tool and uploading the JSON file.For further information on using the DevTools app size tool, see
DevTools documentation.<topic_end>
<topic_start>
Reducing app size
When building a release version of your app,
consider using the --split-debug-info tag.
This tag can dramatically reduce code size.
For an example of using this tag, see
Obfuscating Dart code.Some other things you can do to make your app smaller are:
<topic_end>
<topic_start>Deferred components
<topic_end>
<topic_start>
Introduction
Flutter has the capability to build apps that can

as the compiler can no longer assume that the call is always static.<topic_end>

<topic_start>

Resources

For more performance info, check out the following resources:

<topic_end>

<topic_start>Measuring your app's size

Many developers are concerned with the size of their compiled app.

As the APK, app bundle, or IPA version of a Flutter app is

self-contained and holds all the code and assets needed to run the app,

its size can be a concern. The larger an app,

the more space it requires on a device,

the longer it takes to download,

and it might break the limit of useful

features like Android instant apps.<topic_end>

<topic_start>

Debug builds are not representative

By default, launching your app with flutter run,

or by clicking the Play button in your IDE

(as used in Test drive and

Write your first Flutter app),

generates a debug build of the Flutter app.

The app size of a debug build is large due to

the debugging overhead that allows for hot reload

and source-level debugging. As such, it is not representative of a production

app end users download.<topic_end>

<topic_start>

Checking the total size

A default release build, such as one created by flutter build apk or

flutter build ios, is built to conveniently assemble your upload package

to the Play Store and App Store. As such, they’re also not representative of

your end-users’ download size. The stores generally reprocess and split

your upload package to target the specific downloader and the downloader’s

hardware, such as filtering for assets targeting the phone’s DPI, filtering

native libraries targeting the phone’s CPU architecture.<topic_end>

<topic_start>

Estimating total size

To get the closest approximate size on each platform, use the following

instructions.<topic_end>

<topic_start>Android

Follow the Google Play Console’s instructions for checking app download and

install sizes.Produce an upload package for your application:Log into your Google Play Console. Upload your application binary by drag

dropping the .aab file.View the application’s download and install size in the Android vitals ->

App size tab.The download size is calculated based on an XXXHDPI (~640dpi) device on an

arm64-v8a architecture. Your end users’ download sizes might vary depending on

their hardware.The top tab has a toggle for download size and install size. The page also

contains optimization tips further below.<topic_end>

<topic_start>iOS

Create an Xcode App Size Report.First, by configuring the app version and build as described in the

iOS create build archive instructions.Then:Sign and export the IPA. The exported directory contains

App Thinning Size Report.txt with details about your projected

application size on different devices and versions of iOS.The App Size Report for the default demo app in Flutter 1.17 shows:In this example, the app has an approximate

download size of 5.4 MB and an approximate

installation size of 13.7 MB on an iPhone12,1 (Model ID / Hardware

number for iPhone 11)

and iPhone11,8 (iPhone XR) running iOS 13.0.To measure an iOS app exactly,

you have to upload a release IPA to Apple’s

App Store Connect (instructions)

and obtain the size report from there.

IPAs are commonly larger than APKs as explained

in How big is the Flutter engine?, a

section in the Flutter FAQ.<topic_end>

<topic_start>

Breaking down the size

Starting in Flutter version 1.22 and DevTools version 0.9.1,

a size analysis tool is included to help developers understand the breakdown

of the release build of their application.warning Warning

As stated in the checking total size section

above, an upload package is not representative of your end users’ download

size. Be aware that redundant native library architectures and asset densities

seen in the breakdown tool can be filtered by the Play Store and App Store.The size analysis tool is invoked by passing the --analyze-size flag when

building:This build is different from a standard release build in two ways.In addition to analyzing a single build, two builds can also be diffed by

loading two *-code-size-analysis_*.json files into DevTools. See

DevTools documentation for details.Through the summary, you can get a quick idea of the size usage per category

(such as asset, native code, Flutter libraries, etc). The compiled Dart

native library is further broken down by package for quick analysis.warning Warning

This tool on iOS creates a .app rather than an IPA. Use this tool to

evaluate the relative size of the .app’s content. To get

a closer estimate of the download size, reference the

Estimating total size section above.<topic_end>

<topic_start>

Deeper analysis in DevTools

The *-code-size-analysis_*.json file produced above can be further

analyzed in deeper detail in DevTools where a tree or a treemap view can

break down the contents of the application into the individual file level and

up to function level for the Dart AOT artifact.This can be done by flutter pub global run devtools, selecting

Open app size tool and uploading the JSON file.For further information on using the DevTools app size tool, see

DevTools documentation.<topic_end>

<topic_start>

Reducing app size

When building a release version of your app,

consider using the --split-debug-info tag.

This tag can dramatically reduce code size.

For an example of using this tag, see

Obfuscating Dart code.Some other things you can do to make your app smaller are:

<topic_end>

<topic_start>Deferred components

<topic_end>

<topic_start>

Introduction

Flutter has the capability to build apps that can