The slide used in Shibuya.apk#31

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!