官方API：

A structure describing general information about a display, such as its size, density, and font scaling.

To access the DisplayMetrics members, initialize an object like this:

?DisplayMetrics metrics = new DisplayMetrics();
?getWindowManager().getDefaultDisplay().getMetrics(metrics);

應用實例：

WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics displayMetrics = new DisplayMetrics();
windowManager.getDefaultDisplay().getMetrics(displayMetrics);
int width = displayMetrics.widthPixels;
int height = displayMetrics.heightPixels;

轉載于:https://www.cnblogs.com/diyishijian/p/4634949.html

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