I have android instructor , and he gave several lectures in universities. We will charge $1500 for, four day online course , If you accept the bid , i can fix your meeting over skype with the teacher for answer and questions and other related queries . Payment must be on freelancer and kindly verify yourself before start of the project . If you are serious about the teaching project kindly contact us . We are not US or canadian citizens but we can provide online teaching easily on your required timings .