Notes - Android Jetpack: what’s new in Android Support Library (Google I/O 2018)

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本記事は、Android Jetpack: what’s new in Android Support Library (Google I/O 2018)の記事です。

Packaging
#

Current Package Name
#

com.android.support
- support-v4
- support-v13
- appcompat-v7
- cardview-v7
- gridlayout-v7
- mediarouter-v7
- palette-v7
- preference-v7
- preference-v14
- recyclerview-v7

Packaging Versioning Releasing
#

Form of foundation to jetpack: Android Extension Libraries = AndroidX

Jetpack
#

Guidance
Recommended libraries and tools
Has a cute logo

AndroidX
#

Libraries itself
Technical guarantees
Does not have a cute logo

Finer-grained artifacts
#

Feature-based Maven groupId and artifactId
Scoped to individual widgets, use cases
Compatible with old artifacts
Binary compatible

Refined versioning
#

Reset from 28.0.0 to 1.0.0
Strict semantic versioning
- Major - binary compatibility
- Minor - feature release
- Bug fix
Per-artifact versioning & release
Dependencies defined in POM

Updated packaging
#

Refactored to androidx java packages
- 1androidx..ClassName`
Consistent Maven naming schemes
- androidx.<feature>:<feature>-<sub-feature>
Removed -v7, -v4, etc. naming

Examples
#

Support Library 28.0.0-alpha1 => AndroidX 1.0.0-alpha1
#

com.android.support:multidex
=> androidx.multidex:multidex

com.android.databinding:adapters
=> androidx.databinding:databinding-adapters

android.arch.persistence.room:common
=> androidx.room:room-common

com.android.support:support-compat
=> androidx.core:core

com.android.support:cardview-v7
=> androidx.cardview:cardview```

### Migrating to AndroidX

- Tooling for automatic source migration

  - Available in Android Studio 3.2 Canary 14+

  - *Wait until Canary 15 to start using this*

- Jetifier tool for prebuilt JAR, AAR transformation

  - Available as standalone JAR or Gradle plugin

- 

Use Automated refactoring(As of 05/12/18: Available now in Android Studio 3.2 Canary 14)

  - "Refactor to AndroidX…"

- 

Support Library 28.0.x

  - Parity with AndroidX 1.0.x libraries

  - Same old `android.support` java package

  - Same old `com.android.support` Maven groupId

- No feature releases after 28.0.0

## What's New Features

### RecyclerView Selection

- Touch and mouse-driven

- Preserves state between Activity lifecycle events

- Finger-grained control

dependencies { implementation “androidx.recyclerview:recyclerview-selection:1.0.0-alpha1” }```

Band selection
Item selection area
Item rejection
State management
Much more

RecyclerView ListAdapter
#

Operates on immutable lists
Simplified way to use DiffUtil
Provides animated updates
Concurrency support
Efficiently animates changes
See also AsyncListDiffer

androidx.webkit
#

Provides access to latest WebView platform APIs(android.webkit.*)
Relies on updatable WebView APK
- API 21+ devices only

dependencies {
  implementation "androidx.webkit:webkit:1.0.0-alpha1"
}```

### Browser library

- android.support.customtabs -> `androidx.browser`

- Custom tabs supported by major browsers

  - Chrome

  - Firefox

  - Samsung Internet

- Browser actions

  - Allows apps to hook into browser context-click menu

  - Requires browser support: Chrome v66+

### HeifWriter

- Writing to HEIF files from:

  - YUV byte buffers

  - android.view.Surface

  - android.graphics.Btmap

- API 28+ (backport coming)

### Slices

Android's new approach for remote content

- Templated

- Interactive

- Updatable

Backwards-compatible through API 19+(95% of devices)

#### Goal

- One reusable API for presenting remote app content in Android

- Templated and Interactive

#### Launching in Search

Enhance Suggestions with rich, live app content

- App names

- General terms

Reach hundreds of millions of users with Slices backwards-compatibility

dependencies { implementation “androidx:slice-builders:1.0.0-alpha1” implementation “androidx:slice-view:1.0.0-alpha1” implementation “androidx:slice-core:1.0.0-alpha1” }```

Slice Types
#

Shortcut slice
Small slice
Large slice

Material Components
#

Adding more customization for color, type, and shape
New components
Animations
Express your brand

dependencies {
  implementation "com.google.android.material:material:1.0.0-alpha1"
}```

## 所感・まとめ・個人的に印象に残ったことなど

- Automatic Source MigrationはCanary 15から

- Jetifier名前良い..どういう仕組みとか知るためには[紹介されていた動画](https://www.youtube.com/watch?v=N5xONyp69eU)を見る

- What's new in Android Support Libraryが来年からWhat's new in AndroidXになる！

- Androidアプリ開発を始めてから今まで、Androidのサポートライブラリ系のパッケージング周りよくわからなかったので、今回androidxに統一されて分かりやすくなるの最高そう！

以上です！

Packaging#

Current Package Name#

Packaging Versioning Releasing#

Jetpack#

AndroidX#

Finer-grained artifacts#

Refined versioning#

Updated packaging#

Examples#

Support Library 28.0.0-alpha1 => AndroidX 1.0.0-alpha1#

RecyclerView ListAdapter#

androidx.webkit#

Slice Types#

Material Components#