android - How to get screen display metrics in application class

Question

If I put this in some activity class it works perfectly but, when I put it in my App class the method getWindowManager() can not be found. Is there some way to get the WindowManager in app class?

My app class is defined like this:

public class myApp extends Application {

and in on create method I have this:

DisplayMetrics dm = new DisplayMetrics(); 
getWindowManager().getDefaultDisplay().getMetrics(dm); 
int width = dm.widthPixels;

Answer 1

Here, Context.getResource()

DisplayMetrics dm = getResources().getDisplayMetrics(); 
int densityDpi = dm.densityDpi;