How to get screen resolution of an android device using LIBGDX?

ok you can get the screen resolution by this

Gdx.graphics.getWidth();

//for screen width

Gdx.graphics.getHeight();

//for screen height

and if you want to make a screen resolution free game you can set the view port like this

float scrw=320;

float scrh=480;

scrw is viewport's width and scrh is viewport's height

and set the camera to

camera = new OrthographicCamera();
camera.setToOrtho(false, scrw, scrh);
camera.update();

Gdx.graphics.getWidth();
Gdx.graphics.getHeight();

Though there are some answers here on my question. This is what exactly worked for me. I had to add 'app' after 'Gdx' for it to work.

Gdx.app.graphics.getWidth(); 
Gdx.app.graphics.getHeight();

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