Added sample InfoWindowConcurrentActivity

[zugaldia]

To illustrate the behavior of multiple InfoWindows visible at a time (#3115).

[incanus]

This as well as the Info Window tracking to pans & zooms is 👌 💯

[zugaldia]

@incanus right. both features ended up being implemented at pretty much the same time.

[incanus]

Looking good!

One weird manifestation of this odd UI pattern is the final frame here:

Layering was done by which was above the other pre-rotation, but later rotations can throw this off.

[zugaldia]

cc: @tobrun

[tobrun]

@zugaldia
Not really sure what best UX would be in this case.. hence this is an odd ui pattern.

In general:
The parent layout is a FrameLayout so it will stack up its children in the way they were added to the ViewGroup. We could play around with this by using addView with an index or replace FrameLayout with a Relative so we can use bringToFront.

[zugaldia]

I have added the layering issue @incanus has found to the original ticket (#3115 (comment)) but this doesn't affect this PR, as it's just the test app and the basic functionality is there.

Also, the CI fail above is unrelated to Android, so if it all looks good otherwise, we're ready to merge the branch.

/cc: @bleege

[incanus]

hence this is an odd ui pattern

[bleege]

@zugaldia Let's change the id to something like @+id/infoWindowConcurrentMapView. While there shouldn't be any runtime issues due to namespacing, I unfortunately got us into the habit of using @+id/mapView in all the TestApp examples which makes immediate sight recognition more difficult than it should be.

[zugaldia]

@bleege sounds good, I'll include that before merging.