Add setTextAsync method to TextView

This CL adds a setTextAsync method to the TextView class. This method allows the text to be maniputed on a background thread and set the result on main thread with Runnable.

Bug: 289250881
Test: Manual by checking Notification and Widget Texts.
Change-Id: I3d74f2de2503318441c868bb931a2bc447c03517
1 file changed