Android 获取手机屏幕大小两种方法
第一种：

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

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