WindowManager & DisplayMatrix

// get window managerWindowManager windowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);// get display matrix of windowdm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);// 还可以用以下方法获得displaymetrixcontext.getResources().getDisplayMetrix()// DisplayMetrix 有下列property：public float density;public int densityDpi;public int heightPixels;public float scaledDensity; // 用来做sp与px的转化public int widthPixels;public float xdpi;public float ydpi;