I have installed the latest Android Thing (v1.0.8) on my Raspberry Pi 3 and it is installed correctly but I cannot connect to B4A. Here is a screenshot of the adb command like explained in the tutorial.
But when I try to connect to the device with B4A Bridge using the IP of my Pi it don't connect.
No I did not had this problem, but note that you really need the original Raspberry Pi 3 Model B. It doesn't work on the newer Model B+ and A+ (metallic chipset). See the difference here: https://www.raspberrypi.org/products/#buy-now-modal