SurfaceControlViewHost Input in Android R
In a previous post,
I reviewed the basics of how you can use
in Android R to have the UI from one app be displayed in another app.
The one part that I was missing was user input, as that did not seem to work, though it was advertised as being supported.
Primarily, that was a matter of setting the
SurfaceView to be on top from a Z axis standpoint.
After that, user input worked just fine, at least for click events —
I have not yet experimented with anything more complex. In particular, it will
be interesting to see if text input works, given the three-way interaction
between the app supplying the UI, the app displaying the
Surface, and the input
Many thanks to the Google engineer who pointed out the problem!