Android Weekly Notes #485

Android Weekly Issue #485

Accessibility in Jetpack Compose

Accessibility的codelab.

Benefits of building components instead of screens

Counter, stateful和stateless组件的比较.

组件化的好处.

Explore SplashScreen API, Android 12, Kotlin

Android 12的splash screen:
先设置theme:

<style name="SplashActivity" parent="Theme.AppCompat.NoActionBar">      
<!-- Point 3-->    
<item name="android:windowSplashScreenBackground">#FFFFFF</item>      
<!-- Point 2-->
 <item name="android:windowSplashScreenIconBackgroundColor">
#000000</item>      
<!-- Point 1-->
<item name="android:windowSplashScreenAnimatedIcon">
@drawable/ic_realm_logo_250</item>
<!-- Point 4-->
<item name="android:windowSplashScreenBrandingImage">
@drawable/relam_horizontal</item> </style>

代码里:

private val viewModel: MainViewModel by viewModels()
 override fun onCreate(savedInstanceState: Bundle?) {
     super.onCreate(savedInstanceState)
     addInitialDataListener()
     loadAppView()
 }
 private fun addInitialDataListener() {
     val content: View = findViewById(android.R.id.content)
// This would be called until true is not returned from the condition
     content.viewTreeObserver.addOnPreDrawListener {
         return@addOnPreDrawListener viewModel.isAppReady.value ?:               false
     }
 }
 private fun loadAppView() {
     binding = ActivityMainBinding.inflate(layoutInflater)
     setContentView(binding.root)

有个返回值决定是否跳转.