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 density;
    private DisplayMetrics metrics;
    private int widthPixels;
    private float scaleFactor;
    private float widthDp;
metrics = new DisplayMetrics();
                getActivity().getWindowManager().getDefaultDisplay().getMetrics(metrics);

                density= getResources().getDisplayMetrics().densityDpi;

                widthPixels = metrics.widthPixels;

                scaleFactor = metrics.density;

                widthDp = widthPixels / scaleFactor;
System.out.println("widthDp== "+widthDp );
if(density==DisplayMetrics.DENSITY_HIGH)
                        System.out.println("Density is high");

                    if(density==DisplayMetrics.DENSITY_XXHIGH)
                        System.out.println("Density is xxhigh");

                    if(density==DisplayMetrics.DENSITY_XXXHIGH)
                        System.out.println("Density is xxxhigh");

                    if(density==DisplayMetrics.DENSITY_TV)
                        System.out.println("Density is Tv");