android - Android 上究竟何时加载 "preloaded fonts"？

Question

当我使用 Downloadable Fonts Android 上的功能，我可以通过将此代码添加到 AndroidManifest.xml 来添加预加载策略:

<meta-data android:name="preloaded_fonts" 
           android:resource="@array/preloaded_fonts" />

这究竟是什么时候加载的？在应用程序启动时？安装时？如果它在应用程序启动时，并且我使用 上的字体第一个屏幕 ，有任何性能差异吗？

Answer 1

https://developer.android.com/guide/topics/ui/look-and-feel/downloadable-fonts#predeclaring-fonts

Layout inflation and resource retrieval are synchronous tasks. Bydefault, the first attempt to retrieve fonts triggers a request to thefont provider, and therefore increases the first layout time. To avoidthe delay, you can pre-declare fonts that need retrieving in yourmanifest. After the system retrieves the font from the provider, it isavailable immediately. If the font retrieval takes longer thanexpected, the system aborts the fetching process and uses the defaultfont.