Android Weekly Issue #395

Android Biometrics UX Guide – User Messaging

There are currently only 3 types of Biometrics as of API 29 (Android 10).

// Get Package Manager
val packageManager : PackageManager = context.packageManager

Fingerprint (Added in API 23)

val hasFingerprint = packageManager.hasFeature(PackageManager.FEATURE_FINGERPRINT)

Face (Added in API 29)

val hasFace = packageManager.hasFeature(PackageManager.FEATURE_FACE)

Iris (Added in API 29)

val hasIris = packageManager.hasFeature(PackageManager.FEATURE_IRIS)

Android Unidirectional Data Flow and Local Unit Testing

好长的一篇文章 -> 所以我没有仔细看.

讲了很多单向数据流的架构, 以及测试相关.

看了一个dagger的视频, 2019 dev summit的.
推荐了官方文档, 还有一个codelab project.

后面另一个人上场之后开始讲dagger+kotlin.
以及dagger之后的计划.

Kotlinx Json vs Gson

一个kotlin官方出的json解析库:
https://github.com/Kotlin/kotlinx.serialization

跨平台
支持: SON, CBOR, and Protobuf.
可以结合Retrofit用.

Dagger in a multi-module project without dagger.android

多模块下的dagger.

Implementing your first Android lint rule

自己实现Android Lint rule.

打印log不用Log

Build complex screens faster on Android with Epoxy

使用这个库: https://github.com/airbnb/epoxy

库:
时间线view
https://github.com/vipulasri/Timeline-View

Android Weekly Issue #396

Several Free & Easy Ways to Promote Your App

Post Your App to ProductHunt
Answer Questions on Quora
Get Your App Listed in Roundup Lists
Write Guides & Tutorials
Optimize Your Keywords
Get Influencers to Use Your App
Talk to Journalists
Get Active in Forums, Subreddits, and FB Groups
Create a Referral Program
Get Your App Featured by Apple & Google
Make it Easy to Share Content from Your App
Submit Your App for an Award
Speak at Events Related to Your App

Kotlin Inject

https://github.com/chRyNaN/inject

这个库的目的就是把Java注解包装了一下好用Dagger?

针对的平台: Kotlin multi-platform.

How to resize Icons & Images easily in Android Studio | John Codeos

工具: Android Drawable Importer

Prepopulate Room with data

Let's Review: Pokedex

宠物小精灵app: https://github.com/mrcsxsiq/Kotlin-Pokedex

Android Weekly Issue #397

Screenshot Testing our Design System on Android

UI: 统一组件, 测试.

Any, Unit, Nothing and all their friends

Any -> 编译后变成Object
Unit -> Java中方法返回的void, 实际上Unit的实现是一个单例, Any的一个子类.
Nothing -> 一个只有私有构造的类型, 没有实例. 用于表示不可能存在的值. 只抛出异常的方法, 不可能有返回值, 就返回Nothing. Nothing是所有类型的子类型.

Store grand re-opening: loading Android data with coroutines

又是讲这个库的: https://github.com/dropbox/store

Kotlin Multiplatform — MVVM & Clean Architecture

有一个不错的架构图.

Code & Libraries

https://github.com/scana/ok-gradle
这个插件还挺方便的, Android Studio中添加依赖.

Android Weekly Issue #398

Bringing an old Android library back to life with Kotlin

把一个老的Java库转换为Kotlin库.
转换后的库: https://github.com/chRyNaN/chords

Butterfly Effects

作者回顾这些年他的进步.

有一个给自定义View用注解加属性的开源库还不错.
https://github.com/ZacSweers/Barber

这个画图工具也挺好的: https://excalidraw.com/

作者说他的三个开源项目后来带来了很多机会, 包括演讲, 博客, 更多的开源项目等.

O(1) Android build time at Tiki

多模块来加快build速度.

Documenting your XML attributes for a Custom View

原来给自定义属性加上注释, 就会出现在ide解释里面.

What’s In Your Toolbox?

作者爱用的一些工具.

github actions原来是个CI啊.
https://github.com/features/actions

设计网站:
material: https://material.io/

facebook的设计网站: https://facebook.design/toolsandresources/

做动画的工具: https://github.com/alexjlockwood/ShapeShifter

Using LiveData & Flow in MVVM — Part I

Enabling dark theme in Android WebViews

Android Weekly Issue #399

Adding some Storage (to) Space

这人用Kotlin multiplatform写了个小程序, 用了Compose和SwiftUI:
https://johnoreilly.dev/posts/minimal-kotlin-platform-compose-swiftui/

本篇文章是写他用SQLDelight加了数据存储的部分.

The Power of Types for Errors

多使用自定义类型, 而不是原生类型, 来写出错误更少, 可读性更强的代码.

Encrypting Shared Preferences with the AndroidX Security Library

数据加密官方framework: https://developer.android.com/topic/security/data.md

可以加密文件和shared preferences.

Android Fragments: FragmentContainerView

Kotlin Code Organization

关于如何组织代码.

Android Weekly Issue #400

Android Styling: Themes vs Styles

style: view属性的集合.

theme: 一组属性声明, 并不特定于View. style, layout可以使用theme中定义的属性.

It's Nothing

Adventures in the Land of EditText

Dynamic screens using server-driven UI in Android

用服务器配置UI显示.

这里面提到几个UI显示的库:

Epoxy from Airbnb
Litho from Facebook
Proteus from Flipkart
Graywater from Tumblr
Groupie

Epoxy and Litho是最被广泛使用的.

Utils class in Kotlin

From RxJava to Kotlin Flow: Backpressure

Become a Master Builder with these Android Dev Tools

开发工具介绍.

Vysor
Chucker
Stetho
LeakCanary
Shape Shifter
Charles Proxy
Accessibility Scanner
Window VQA
Screen Recorder
Dev Tiles

The Surface Duo SDK Preview

微软的一个sdk, 双屏开发.

Android Weekly Issue #401

Tame Your Gradle Dependencies just BECAUSE!

可以给依赖加原因:

implementation("com.blundell:android-blog:1.2.3") {
    because "If we didn't Blundell might cry."
}

Dropping Columns Like It's Hot

要删除数据库中的一列.

SQLite本身是不支持的, 用到的第三方库的实现是拷贝了表, 去掉该列.

在此过程中发生了外键的问题, 通过改变流程来解决.

Android Fragments: FragmentFactory

构造有参数的Fragment -> FragmentFactory.

Use view binding to replace findViewById

// Available in Android Gradle Plugin 3.6.0
android {
    viewBinding {
        enabled = true
    }
}

// Android Studio 4.0
android {
    buildFeatures {
        viewBinding = true
    }
}

优势:

类型安全.
Null Safety.

viewBinding和dataBinding的关系? 区别?

view binding不需要给xml外面包装标签了.
两者可以同时使用, 此时要加layout标签.

Android functional Clean Architecture

Getting Started with Kotlin on iOS, Part 1

Code

https://bubu1.eu/openpush/

https://github.com/ncapdevi/FragNav

Json 2 Kotlin转换插件:
https://plugins.jetbrains.com/plugin/9960-json-to-kotlin-class-jsontokotlinclass-

Android Weekly Issue #402

Kdoc for Android libraries using Dokka

Kotlin的文档生成工具: https://github.com/Kotlin/dokka

本文是使用过程中一些具体问题的解决.

Mastering Android Emulator SIM card

模拟器高端玩家.

Exploring the Android 11 Developer Preview: Permission Changes

11的开发者预览: https://android-developers.googleblog.com/2020/02/Android-11-developer-preview.html

本文是对permission部分的内容.

Is Your Kotlin Code Really Obfuscated?

Kotlin的参数检查会暴露名字.

可以通过更新混淆规则解决.

An efficient way to use Uniflow

Uniflow: https://github.com/uniflow-kt/uniflow-kt

单向数据流, 用了协程.

本文是个小例子.

A Dependency Injection Showdown

4个DI框架的比较:

Koin
Kodein
Dagger
Toothpick

Cheatsheet about Dagger

一些dagger的cheatsheet.

News

https://android-developers.googleblog.com/2020/02/Android-11-developer-preview.html

Android Weekly Notes #395-#402