![PrecomputedText
● Used for background text layout
● Easy integration with RecyclerView
recyclerView.adapter =
object: RecyclerView.Adapter<Holder>() {
override fun onBindViewHolder(holder: Holder,
position: Int) {
Holder.view.apply {
setTextFuture(
PrecomputedTextCompat.getTextFuture(
sampleText[position],
textMetricsParamsCompat,
null)
)
}
}
}](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Android: Recent Text Features
- 1. Recent Text Features Old and New features Seigo Nonaka Android Text @ Google @ttuusskk
- 2. PrecomputedText ● Used for background text layout ● Easy integration with RecyclerView recyclerView.adapter = object: RecyclerView.Adapter<Holder>() { override fun onBindViewHolder(holder: Holder, position: Int) { Holder.view.apply { setTextFuture( PrecomputedTextCompat.getTextFuture( sampleText[position], textMetricsParamsCompat, null) ) } } }
- 3. Performance Improvement ● Removed global mutex lock during doing text layout. 0 25 50 75 100 milliseconds 125 150 175 API27 API27 API27 API28 1 thread 2 threads 4 thread 8 threads 34.9 49.0 82.1 318.7 22.1 22.5 26.5 82.6
- 4. Typeface.Builder ● Replacement for createFromAsset, createFromFile. ● Variable Font Support (later) ● Font Collection Support textView1.typeface = Typeface.Builder(assets, "NotoSansCJK-Regular.ttc") .setTtcIndex(0).build() textView2.typeface = Typeface.Builder(assets, "NotoSansCJK-Regular.ttc") .setTtcIndex(1).build() textView3.typeface = Typeface.Builder(assets, "NotoSansCJK-Regular.ttc") .setTtcIndex(2).build() textView4.typeface = Typeface.Builder(assets, "NotoSansCJK-Regular.ttc") .setTtcIndex(3).build()
- 5. Variable Font ● OpenType Variable Font ● Either string representation or FontVariationAxis class can be used. textView1.typeface = Typeface.Builder(assets, "AdobeVFPrototype.ttf") .setFontVariationSettings("'wght' 200").build() textView2.typeface = Typeface.Builder(assets, "AdobeVFPrototype.ttf") .setFontVariationSettings("'wght' 400").build() textView3.typeface = Typeface.Builder(assets, "AdobeVFPrototype.ttf") .setFontVariationSettings("'wght' 700").build() textView4.typeface = Typeface.Builder(assets, "AdobeVFPrototype.ttf") .setFontVariationSettings("'wght' 900").build()
- 6. Locale List Fallback ● Font selector is now aware of locale list ● By default, system locale settings is used. textView1.textLocales = LocaleList.forLanguageTags("en-US,ja-JP") textView2.textLocales = LocaleList.forLanguageTags("en-US,zh-CN") textView3.textLocales = LocaleList.forLanguageTags("en-US,zh-TW") textView4.textLocales = LocaleList.forLanguageTags("ja-JP,zh-TW")
- 7. Serif Fallback ● System font is now aware of serif font. ● Use serif font if fonFamily=”serif” is specified.
- 8. Justification ● Justification by whitespaces ● API is available since API 26, but due to bug, please use it API 28+
- 9. Line Spacing Improvement ● Avoid glyph overlap for the taller glyph languages. ● Enabled by default API 28+ ● You can move back to old impl by specifying fallbackLineSpacing=”false”
- 10. Thank you for your attention!