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android.graphics.Typeface.create() isn't thread safe.

I suppose the relevant question is, *should* it be thread safe. I don't know. That said, I suspect many people think that it IS thread safe, e.g. this stackoverflow question suggests that using Bitmap/etc. from a non-UI thread should be fine, within the context of a question that mentions Typeface.create():

http://stackoverflow.com/questions/8288155/android-offscreen-drawing-from-non-ui-thread

The problem is that Typeface.create() isn't thread safe. At all.

For example, Typeface.java contains no `synchronized` code:

https://android.googlesource.com/platform/frameworks/base/+/master/graphics/java/android/graphics/Typeface.java

Furthermore, Typeface.create() calls sTypefaceCache.put() on line 160, which raises the question: is sTypefaceCache.put() thread safe?

sTypefaceCache is a LongSparseArray<E>, and LongSparseArray<E> isn't thread safe either:

https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/util/LongSparseArray.java

Again, no `synchronized` in sight, and put() contains no other form of locking either.

If Typeface.create() is called concurrently from multiple threads, all bets at sane behavior are off.

At minimum, could this at least be *documented*?

Even better, could Typeface.create() and company be made properly thread safe?