Spotify Android Software Engineer interview questions

A recruiter reached me through Linked In, for an opportunity in Stockholm. I set a calendar appointment and also sent a private message to ask more details about the proccess. Never got a response.Nevetheless, the date of the appointment reached ( Google Meet Room) and I enter the specified room with the correct code and the recruiter never let me join our meeting . I tried another three times. Waited half an hour and then I closed the application. The calendar was no longer availble ,so I wasn't able to rescedule the appointment from the attached link. Don't know what happened , but i would be nice if I had a heads up . If she couldn't make it, she should have reached me to find a solution . I got a day off from my work for nothing.

Step 1 : Non technical discussion with HR (Video) - 30min approx Step 2 : Interview with Android engineers (Video) - 90 min Interview with Android engineers ( Android + Computer science question + live coding ) #Android questions : 1) what is activity 2) what is fragment 3) what is content providder 4) what is service 5) what is boundservice & startedservice 6) what is intentservice 7) what is lint 8) what are ways to pass data from activity yo activity without using intent 9) what is broadcastreceiver #Computer Science questions 1) what is time complexity? 2) what is the timecomplexity of a sorted array 3) what is the difference between arraylist ani linkedlist 4) how do you keep your code clean 5) What is polymorphism