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
12 files changed
tree: 643ab599b95ee28c93f92c0ef6c7ae936e56a15e
  1. .idea/
  2. annotations/
  3. api/
  4. buildSrc/
  5. compat/
  6. core-ui/
  7. core-utils/
  8. customtabs/
  9. design/
  10. development/
  11. dynamic-animation/
  12. emoji/
  13. exifinterface/
  14. fragment/
  15. frameworks/
  16. gradle/
  17. graphics/
  18. media-compat/
  19. percent/
  20. recommendation/
  21. samples/
  22. scripts/
  23. testutils/
  24. transition/
  25. tv-provider/
  26. v13/
  27. v14/
  28. v17/
  29. v4/
  30. v7/
  31. wear/
  32. .gitignore
  33. Android.mk
  34. build.gradle
  35. CleanSpec.mk
  36. droiddoc.mk
  37. gradle.properties
  38. gradlew
  39. pathmap.mk
  40. PREUPLOAD.cfg
  41. README.md
  42. settings.gradle
README.md

AOSP Support Library Contribution Guide

Accepted Types of Contributions

  • Bug fixes (needs a corresponding bug report in b.android.com)
  • Each bug fix is expected to come with tests
  • Fixing spelling errors
  • Updating documentation
  • Adding new tests to the area that is not currently covered by tests

We are not currently accepting new modules, features, or behavior changes.

Checking Out the Code

NOTE: You will need to use Linux or Mac OS. Building under Windows is not currently supported.

Follow the “Downloading the Source” guide to install and set up repo tool, but instead of running the listed repo commands to initialize the repository, run the folowing:

repo init -u https://android.googlesource.com/platform/manifest -b ub-supportlib-master

Now your repository is set to pull only what you need for building and running support library. Download the code (and grab a coffee while we pull down 7GB):

repo sync -j8 -c

You will use this command to sync your checkout in the future - it’s similar to git fetch

Using Android Studio

Open path/to/checkout/frameworks/support/ in Android Studio. Now you're ready edit, run, and test!

If you get “Unregistered VCS root detected” click “Add root” to enable git integration for Android Studio.

If you see any warnings (red underlines) run Build > Clean Project.

Optional - Full Build

You can do most of your work from Android Studio, however you can also build the full support library from command line:

cd path/to/checkout/frameworks/support/
./gradlew createArchive

Running Tests

Single Test Class or Method

  1. Open the desired test file in Android Studio.
  2. Right-click on a test class or @Test method name and select Run FooBarTest

Full Test Package

  1. In the project side panel open the desired module.
  2. Find the directory with the tests
  3. Right-click on the directory and select Run android.support.foobar

Running Sample Apps

Support library has a set of Android applications that exercise support library code. These applications can be useful when you want to debug a real running application, or reproduce a problem interactively, before writing test code.

These applications are named support-*-demos (e.g. support-4v-demos or support-leanback-demos. You can run them by clicking Run > Run ... and choosing the desired application.

Making a change

cd path/to/checkout/frameworks/support/
repo start my_branch_name .
(make needed modifications)
git commit -a
repo upload --current-branch .

If you see the following prompt, choose always:

Run hook scripts from https://android.googlesource.com/platform/manifest (yes/always/NO)?

Getting reviewed

  • After you run repo upload, open r.android.com
  • Sign in into your account (or create one if you do not have one yet)
  • Add an appropriate reviewer (use git log to find who did most modifications on the file you are fixing)