Are android phones safe?

When it come to the privacy of a person, it must not be compromised.But android phones have had this loophole since many days.The place you travel is also being tracked.
In the TEDx talk,Bram Bonné mentioned explained on how continuously android phone on the wifi networks that are saved in your device.For example,if you connect to a free wifi network(hotspot)-like the Mcdonalds,a spoof network will be created and once this is done,the networks that your phone has been saved or previously connected will be visible to them.
Here is a video of Bonné addressing at the TEDx.