Best practice to pass Context to non-activity classes?

You can do that using ContextWrapper, as described here.

For example:

public class MyContextWrapper extends ContextWrapper {

    public MyContextWrapper(Context base) {
      super(base);
   }

    public void makeMyAppAwesome(){
        makeBaconAndEggsWithMeltedCheese(this);
    }
}

And call the non activity class like this from an Activity

new MyContextWrapper(this);