how to get total screen size on an android device programmatically

Question

if i use the code shown here to get the total screen size it is always short on height to the total screen size as shown in the documented specs for the device. for example

Answer 1

int screenSize = getResources().getConfiguration().screenLayout &
    Configuration.SCREENLAYOUT_SIZE_MASK;

switch(screenSize) {
case Configuration.SCREENLAYOUT_SIZE_LARGE:
    Toast.makeText(this, "Large screen",Toast.LENGTH_LONG).show();
    break;
case Configuration.SCREENLAYOUT_SIZE_NORMAL:
    Toast.makeText(this, "Normal screen",Toast.LENGTH_LONG).show();
    break;
case Configuration.SCREENLAYOUT_SIZE_SMALL:
    Toast.makeText(this, "Small screen",Toast.LENGTH_LONG).show();
    break;
default:
    Toast.makeText(this, "Screen size is neither large, normal or small" ,  Toast.LENGTH_LONG).show();
}