Androidが携帯電話の画面サイズを取得する2つの方法

1つ目:

public  point getdisplaymetrics() {        displaymetrics dm = new  displaymetrics();        dm = getapplicationcontext().getresources().getdisplaymetrics();        int  screenwidth = dm.widthpixels;        int  screenheight = dm.heightpixels;        return   new  point(screenwidth ,screenheight );    }

2つ目:

public  point getdisplayscreen() {        windowmanager windowmanager = getwindowmanager();       display display = windowmanager.getdefaultdisplay();       screenwidth  = display.getwidth();       screenheight = display.getheight();       return   new  point(screenwidth ,screenheight );    }