屏幕尺寸（高、宽）

public void getMetrics(DisplayMetrics outMetrics) {outMetrics.widthPixels  = getWidth();outMetrics.heightPixels = getHeight();outMetrics.density      = mDensity;outMetrics.densityDpi   = (int)((mDensity*DisplayMetrics.DENSITY_DEFAULT)+.5f);outMetrics.scaledDensity= outMetrics.density;outMetrics.xdpi         = mDpiX;outMetrics.ydpi         = mDpiY;}//仅仅是将Display的内部值赋给了DisplayMetrics的属性值