by using the code:

DisplayMetrics dm = getResources().getDisplayMetrics();
int screenWidth = dm.widthPixels;
int screenHeight = dm.heightPixels;

Log.e(TAG, "W = " + dm.widthPixels + ", H = " + dm.heightPixels);

get the width and height of the screen. On the phone I tested, screenWidth = 1440 , screenHeight = 2400 :

View layout_width layout_height match_parent:

onDraw View width height:

:

I would like to ask you why and how to solve this inconsistency problem?