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;

Answer 2

You can also try this:

WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
final DisplayMetrics displayMetrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(displayMetrics);
int height = displayMetrics.heightPixels;
int width = displayMetrics.widthPixels;

Answer 3

hope this will work for you

DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
int pxWidth = displayMetrics.widthPixels;
int pxHeight = displayMetrics.heightPixels;

Answer 4

With Context -

context.resources.displayMetrics.widthPixels

Without Context use -

Resources.getSystem().displayMetrics.widthPixels // but this doesn't work well on foldables

Note : getWindowManager().getDefaultDisplay().getMetrics(dm); returns void in the new API.

Answer 5

Try this:

Display display = getWindowManager().getDefaultDisplay();
Log.e("", "" + display.getHeight() + " " + display.getWidth());

Answer 6

final DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);

int width = dm.widthPixels;
int height = dm.heightPixels;

getWindow().setLayout((int) (width * .8), (int) (height * .5));