Android Weekly Issue #408

App Standby Buckets In Android

Android Pie (Version 9 API level 28)推出的新的电量管理: App Standby Buckets.

根据用户使用习惯, priority buckets.

可以调用这个方法: getAppStandbyBucket查看app目前是哪个standby bucket.

Orientation, Spanning and Insets

微软的Surface Duo.

Jetpack ViewModel initialization

ViewModel的目的: to survive destruction and recreation of those system view classes (e.g. on device rotation).

用代理属性:

val model by viewModels<MyScreenViewModel>()

有参数的时候需要一个factory:

private val model by viewModels<MyScreenViewModel> {
    MyScreenViewModelFactory("Hello world")
}

Android Multi-Module & Dagger: a real use case

多个module的dagger依赖注入.

Surviving Configuration Change with ViewModel

ViewModel一些基本的东西.

Layout Inspector

Android Studio 4.0.

Layout Inspector可以像Chrome dev tools一样debug布局.

有3D模式可以分层查看.

Dagger code generation cheat sheets

Dagger的cheatsheet.

Merge adapters sequentially with MergeAdapter

RecyclerView的MergeAdapter: https://developer.android.com/reference/androidx/recyclerview/widget/MergeAdapter

可以把多个Adapter接在一起, 放在一个RecyclerView中使用:

val firstAdapter: FirstAdapter = …
val secondAdapter: SecondAdapter = …
val thirdAdapter: ThirdAdapter = …
val mergeAdapter = MergeAdapter(firstAdapter, secondAdapter, 
     thirdAdapter)
recyclerView.adapter = mergeAdapter

Code

FloorPlan

把Room的schemas转换成DBML: https://www.dbml.org/home/#intro

chip-navigation-bar

一个bottom navigation bar.

PowerPermission

一个动态请求的封装库.
有各种支持的实现: Rx, 协程, LiveData.

News

Meet the finalists of the Google Play Indie Games Festival

独立游戏.