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28-Apr-2017 |
Seigo Nonaka <nona@google.com> |
Make Font Resources XML working on Android N or before device.
This addresses several issues:
- API 16 to API 25
There are two main issues.
-- AssetManager failed to open file by path name.
Fixed by using Resources.openRawResource instead of
AssetManager.openNonAssetFd.
-- TextView's style is ignored.
Before API 26, there is no way to create Typeface from multiple font
files. If Typeface is created from multiple font files, TextView will
select correct font based on style information of them.
However, this is impossible on API 25 or before. So select best match
font from given list and create Typeface with it.
At the same time, there is a concept "fakeBold" and "fakeItalic" on
Android. If even the best matched Typeface is not usable for requested
style, TextView makes bold/italic glyph with transforming available
glyph. Since we does font selection by ourselves, needs to set fake
bold/italic by manual too.
- API 16 - API 19
Styled typeface can be created from another Typeface like as follows.
Typeface boldTypeface = Typeface.create(baseTypeface, Typeface.BOLD);
The passed style information can be retrieved by Typeface.getStyle()
but this doesn't return real value on API 19 or before. Thus, introduce
TypefaceHolder to hold actually using weight/italic information.
Known Issues:
- API 15 or before
Still not working even after this patch. TypedArray returns false for
hasValue with R.styleable.TextAppearance_android_fontFamily.
- API 21 - API 25
The skew angle is sharper.
Bug: 37754362
Test: ./gradlew support-compat:connectedDebugAndroidTest passes on
API 15,16,17,18,19,21,23,25,26
Test: Test App attached issue 37754362 show the same result on
API 16,17,18,19,21,23,25
except for fake italic angle.
Screenshots is available on issue tracker.
Change-Id: I6bd615774be55981289f5f3b88f3d71fa1b39014
/frameworks/support/compat/tests/res/font/samplexmlfont.xml
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