Android Weekly Notes #434 #435

2020-10-18 本文已影响0人圣骑士wind

Android Weekly Issue #434

Busting Android performance myths

几个关于Android性能的谜题.

Myth 1: Kotlin apps are bigger and slower than Java apps -> 不是.
Myth 2: Getters and setters are expensive -> 不是.
Myth 3: Lambdas are slower than inner classes -> 没有.
Myth 4: Allocating objects is expensive, I should use pools -> 这个问题有点复杂, 取决于实际应用场景和实现.
Myth 5: Profiling my debuggable app is fine -> debuggable的app没有经过优化, 你可能会把时间浪费在不需要优化的点上.

还有一些奇怪的事情:

Strangeness 1: Multidex: Does it affect my app performance?
Strangeness 2: Dead code

使用了这个工具:
https://developer.android.com/studio/profile/benchmark

Android Emulator in a CI environment

Android官方博客: https://android-developers.googleblog.com/2019/10/continuous-testing-with-new-android.html

开源了android emulator container:
https://github.com/google/android-emulator-container-scripts

除了部署还可以debug.

Android Weekly Issue #435

Android Sharesheet: Old Dog, New Tricks

分享弹框.

val share = Intent.createChooser(Intent().apply {
  action = Intent.ACTION_SEND
  putExtra(Intent.EXTRA_TEXT, "https://developer.android.com/training/sharing/")

  // (Optional) Here we're setting the title of the content
  putExtra(Intent.EXTRA_TITLE, "Introducing content previews")

  // (Optional) Here we're passing a content URI to an image to be displayed
  data = contentUri
  flags = Intent.FLAG_GRANT_READ_URI_PERMISSION
}, null)

startActivity(share)