Monitor Currently Running Application

Question

I am encountering a problem that i can\'t not solve for the moment.
The purpose of the code is to monitor which applications are running at current moment.
I used the fo

Answer 1

replace the "Activity" in getSystemService's parameters with "Context":

ActivityManager  manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

I tested it and works fine for me!