Ekhlass/Flutter_Documentation · Datasets at Hugging Face

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given to people who are more verbose (more willing to chat or write) or those
who are closer to the development team, who have a larger bandwidth and lower
cost for chatting or face-to-face meetings.By having the same metrics to detect problems no matter how far away or how
silent the users are, we can treat all issues fairly. That, in turn,
allows us to focus on the right issues that have greater impact.<topic_end>
<topic_start>
How to make performance useful
The following summarizes the 4 points discussed here, from a slightly different
perspective:Make performance metrics easy to consume. Do not overwhelm the readers with a
lot of numbers (or words). If there are many numbers, then try to summarize
them into a smaller set of numbers (for example, summarize many numbers into
a single average number). Only notify readers when the numbers change
significantly (for example, automatic alerts on spikes or regressions).Make performance metrics as unambiguous as possible. Define the unit that the
number is using. Precisely describe how the number is measured. Make the
number easily reproducible. When there’s a lot of noise, try to show the full
distribution, or eliminate the noise as much as possible by aggregating many
noisy measurements.Make it easy to compare performance. For example, provide a timeline to
compare the current version with the old version. Provide ways and tools to
convert one metric to another. For example, if we can convert both memory
increase and fps drops into the number of users dropped or revenue lost in
dollars, then we can compare them and make an informed trade-off.Make performance metrics monitor a population that is as wide as possible,
so no one is left behind.
<topic_end>
<topic_start>Obfuscate Dart code
<topic_end>
<topic_start>
What is code obfuscation?
Code obfuscation is the process of modifying an
app’s binary to make it harder for humans to understand.
Obfuscation hides function and class names in your
compiled Dart code, replacing each symbol with
another symbol, making it difficult for an attacker
to reverse engineer your proprietary app.Flutter’s code obfuscation works
only on a release build.<topic_end>
<topic_start>
Limitations
Note that obfuscating your code does not
encrypt resources nor does it protect against
reverse engineering.
It only renames symbols with more obscure names.info
It is a poor security practice to
store secrets in an app.<topic_end>
<topic_start>
Supported targets
The following build targets
support the obfuscation process
described on this page:info
Web apps don’t support obfuscation.
A web app can be minified, which provides a similar result.
When you build a release version of a Flutter web app,
the web compiler minifies the app. To learn more,
see Build and release a web app.<topic_end>
<topic_start>
Obfuscate your app
To obfuscate your app, use the flutter build command
in release mode
with the --obfuscate and --split-debug-info options.
The --split-debug-info option specifies the directory
where Flutter outputs debug files.
In the case of obfuscation, it outputs a symbol map.
For example:Once you’ve obfuscated your binary, save
the symbols file. You need this if you later
want to de-obfuscate a stack trace.lightbulb Tip
The --split-debug-info option can also be used without --obfuscate
to extract Dart program symbols, reducing code size.
To learn more about app size, see Measuring your app’s size.For detailed information on these flags, run
the help command for your specific target, for example:If these flags are not listed in the output,
run flutter --version to check your version of Flutter.<topic_end>
<topic_start>
Read an obfuscated stack trace
To debug a stack trace created by an obfuscated app,
use the following steps to make it human readable:Find the matching symbols file.
For example, a crash from an Android arm64
device would need app.android-arm64.symbols.Provide both the stack trace (stored in a file)
and the symbols file to the flutter symbolize command.
For example:For more information on the symbolize command,
run flutter symbolize -h.<topic_end>
<topic_start>
Read an obfuscated name
To make the name that an app obfuscated human readable,
use the following steps:To save the name obfuscation map at app build time,
use --extra-gen-snapshot-options=--save-obfuscation-map=/<your-path>.
For example:To recover the name, use the generated obfuscation map.
The obfuscation map is a flat JSON array with pairs of
original names and obfuscated names. For example,
["MaterialApp", "ex", "Scaffold", "ey"], where ex
is the obfuscated name of MaterialApp.<topic_end>
<topic_start>
Caveat
Be aware of the following when coding an app that will
eventually be an obfuscated binary.
<code_start>expect(foo.runtimeType.toString(), equals('Foo'));<code_end>
<topic_end>
<topic_start>Create flavors of a Flutter app
<topic_end>
<topic_start>
What are flavors
Have you ever wondered how to set up different environments in your Flutter app?
Flavors (known as build configurations in iOS and macOS), allow you (the developer) to
create separate environments for your app using the same code base.

given to people who are more verbose (more willing to chat or write) or those

who are closer to the development team, who have a larger bandwidth and lower

cost for chatting or face-to-face meetings.By having the same metrics to detect problems no matter how far away or how

silent the users are, we can treat all issues fairly. That, in turn,

allows us to focus on the right issues that have greater impact.<topic_end>

<topic_start>

How to make performance useful

The following summarizes the 4 points discussed here, from a slightly different

perspective:Make performance metrics easy to consume. Do not overwhelm the readers with a

lot of numbers (or words). If there are many numbers, then try to summarize

them into a smaller set of numbers (for example, summarize many numbers into

a single average number). Only notify readers when the numbers change

significantly (for example, automatic alerts on spikes or regressions).Make performance metrics as unambiguous as possible. Define the unit that the

number is using. Precisely describe how the number is measured. Make the

number easily reproducible. When there’s a lot of noise, try to show the full

distribution, or eliminate the noise as much as possible by aggregating many

noisy measurements.Make it easy to compare performance. For example, provide a timeline to

compare the current version with the old version. Provide ways and tools to

convert one metric to another. For example, if we can convert both memory

increase and fps drops into the number of users dropped or revenue lost in

dollars, then we can compare them and make an informed trade-off.Make performance metrics monitor a population that is as wide as possible,

so no one is left behind.

<topic_end>

<topic_start>Obfuscate Dart code

<topic_end>

<topic_start>

What is code obfuscation?

Code obfuscation is the process of modifying an

app’s binary to make it harder for humans to understand.

Obfuscation hides function and class names in your

compiled Dart code, replacing each symbol with

another symbol, making it difficult for an attacker

to reverse engineer your proprietary app.Flutter’s code obfuscation works

only on a release build.<topic_end>

<topic_start>

Limitations

Note that obfuscating your code does not

encrypt resources nor does it protect against

reverse engineering.

It only renames symbols with more obscure names.info

It is a poor security practice to

store secrets in an app.<topic_end>

<topic_start>

Supported targets

The following build targets

support the obfuscation process

described on this page:info

Web apps don’t support obfuscation.

A web app can be minified, which provides a similar result.

When you build a release version of a Flutter web app,

the web compiler minifies the app. To learn more,

see Build and release a web app.<topic_end>

<topic_start>

Obfuscate your app

To obfuscate your app, use the flutter build command

in release mode

with the --obfuscate and --split-debug-info options.

The --split-debug-info option specifies the directory

where Flutter outputs debug files.

In the case of obfuscation, it outputs a symbol map.

For example:Once you’ve obfuscated your binary, save

the symbols file. You need this if you later

want to de-obfuscate a stack trace.lightbulb Tip

The --split-debug-info option can also be used without --obfuscate

to extract Dart program symbols, reducing code size.

To learn more about app size, see Measuring your app’s size.For detailed information on these flags, run

the help command for your specific target, for example:If these flags are not listed in the output,

run flutter --version to check your version of Flutter.<topic_end>

<topic_start>

Read an obfuscated stack trace

To debug a stack trace created by an obfuscated app,

use the following steps to make it human readable:Find the matching symbols file.

For example, a crash from an Android arm64

device would need app.android-arm64.symbols.Provide both the stack trace (stored in a file)

and the symbols file to the flutter symbolize command.

For example:For more information on the symbolize command,

run flutter symbolize -h.<topic_end>

<topic_start>

Read an obfuscated name

To make the name that an app obfuscated human readable,

use the following steps:To save the name obfuscation map at app build time,

use --extra-gen-snapshot-options=--save-obfuscation-map=/<your-path>.

For example:To recover the name, use the generated obfuscation map.

The obfuscation map is a flat JSON array with pairs of

original names and obfuscated names. For example,

["MaterialApp", "ex", "Scaffold", "ey"], where ex

is the obfuscated name of MaterialApp.<topic_end>

<topic_start>

Caveat

Be aware of the following when coding an app that will

eventually be an obfuscated binary.

<code_start>expect(foo.runtimeType.toString(), equals('Foo'));<code_end>

<topic_end>

<topic_start>Create flavors of a Flutter app

<topic_end>

<topic_start>

What are flavors

Have you ever wondered how to set up different environments in your Flutter app?

Flavors (known as build configurations in iOS and macOS), allow you (the developer) to

create separate environments for your app using the same code base.