获取屏幕宽高

WindowManager wm = getWindowManager();
 Point point = new Point();
 wm.getDefaultDisplay().getSize(point);
 int width = point.x;
 int height = point.y;

在sdk版本13以前可使用：

WindowManager wm = getWindowManager();
 int width = wm.getDefaultDisplay().getWidth();
 int height = wm.getDefaultDisplay().getHeight();