我发现weigan的答案最好的一个在这一页，这里是如何在Xamarin使用它。Android:

public int GetScreenWidth()
{
    return Resources.System.DisplayMetrics.WidthPixels;
}

public int GetScreenHeight()
{
    return Resources.System.DisplayMetrics.HeightPixels;
}

似乎所有这些答案都不适合我的Galaxy M51和Android 11。在做了一些研究之后，我发现了这个代码:

WindowMetrics windowmetrics = MainActivity.getWindowManager().getCurrentWindowMetrics();
Rect rect = windowmetrics.getBounds();
int width = rect.right;
int height =rect.bottom;

显示我的真实设备分辨率为1080x2400，其余只返回810x1800。

DisplayMetrics dimension = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dimension);
        int width = dimension.widthPixels;
        int height = dimension.heightPixels;

屏幕分辨率是屏幕中像素的总和。下面的程序将提取设备的屏幕分辨率。它将打印屏幕的宽度和高度。这些值以像素为单位。

public static Point getScreenResolution(Context context) {
// get window managers
WindowManager manager =  (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
Point point = new Point();
display.getSize(point);

 // get width and height
 int width = point.x;
 int height = point.y;

 return point;

}

对于kotlin用户

fun Activity.displayMetrics(): DisplayMetrics {
   val displayMetrics = DisplayMetrics()
   windowManager.defaultDisplay.getMetrics(displayMetrics)
   return displayMetrics
}

在Activity中，你可以使用它

     resources.displayMetrics.let { displayMetrics ->
        val height = displayMetrics.heightPixels
        val width = displayMetrics.widthPixels
    }

或者碎片化

    activity?.displayMetrics()?.run {
        val height = heightPixels
        val width = widthPixels
    }

有一个非常简单的答案，没有通过上下文

public static int getScreenWidth() {
    return Resources.getSystem().getDisplayMetrics().widthPixels;
}

public static int getScreenHeight() {
    return Resources.getSystem().getDisplayMetrics().heightPixels;
}

注:如果你想要高度包括导航条，使用下面的方法

WindowManager windowManager =
        (WindowManager) BaseApplication.getApplication().getSystemService(Context.WINDOW_SERVICE);
    final Display display = windowManager.getDefaultDisplay();
    Point outPoint = new Point();
    if (Build.VERSION.SDK_INT >= 19) {
        // include navigation bar
        display.getRealSize(outPoint);
    } else {
        // exclude navigation bar
        display.getSize(outPoint);
    }
    if (outPoint.y > outPoint.x) {
        mRealSizeHeight = outPoint.y;
        mRealSizeWidth = outPoint.x;
    } else {
        mRealSizeHeight = outPoint.x;
        mRealSizeWidth = outPoint.y;
    }