flutter note

最新推荐文章于 2022-09-21 14:54:41 发布

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flutter note

project types

application

a whole new application

plugin

exposing an android or ios api for developers

package

creating a pure dart component, like a new widget

module

creating a flutter component to add to an android app

commonly used commands

Upgrade
$ flutter upgrade
switch channel (stable recommended)
$ fultter channel beta/dev/master/stable
check environment
$ flutter doctor

flutter for web (in progress)

for details, check article Hummingbird: Building Flutter for the Web

flutter for desktop

Desktop Embedding for Flutter

by google

Feather Apps

by a 3rd party company, commercial license, check article 使用 Flutter 开发 macOS App

problem notes

debug app with blank screen

One possible reason is your environment variable http_proxy/https_proxy has block the communication between flutter compiler and flutter vm on the remote device. If this is the case, we just set an environment variable no_proxy with 127.0.0.1 included to solve this problem.

Memo

Releationships between Widget, Element and RenderObject

[todo] - refer to Flutter, what are Widgets, RenderObjects and Elements?

Cocoapods

You can install Cocoapods via two ways: homebrew and rubygems

by homebrew

$ brew install cocoapods

for details, refer to Homebrew Formulae

by rubygems

$ sudo gem install cocoapods

for details, refer to Getting Started

rubygems

replace source with chinese mirror

$ gem sources --add https://gems.ruby-china.com/ --remove https://rubygems.org/
$ gem sources -l

Json and Serialization

For small project - decode manually
- or, you can use the following online tool to help you generate the serialization logic
  - https://javiercbk.github.io/json_to_dart/
  - https://quicktype.io/
For medium to large projects - code generation
- json_serializable
  - add a dev dependency - build_runner: ^1.0.0
  - one-time code generation - $ flutter pub run build_runner build
  - generating code continuously - $ flutter pub run build_runner watch
  - this lib will generate a new file named xxx.g.dart with all generated utility functions, however, you’ll need to write the below boilerplate functions
    - factory XXX.fromJson(Map<String, dynamic> json) => _$XXXFromJson(json);
    - Map<String, dynamic> toJson() => _$XXXToJson(this);
- built_value
Flutter does not support runtime reflection, that is why you cannot find a GSON/Jackson/Moshi equivalent in flutter.
- Runtime reflection interferes with tree shaking. With tree shaking, you can “shake off” unused code from your release builds. This optimizes the app’s size significantly.

For details, refer to JSON and serialization

Hot restart/reload and debugging dart code for flutter module

Execute the following command under flutter module root directory,

$ flutter attach

Then, launch your application in debug mode from Android Studio or Xcode.

~~it seems there’s a problem in attaching a ios emulator, refer to flutter attach - Oops; flutter has exited unexpectedly.~~
resolved in new version (1.7.8+hotfix.3)