有没有一种方法来确定厘米或英寸的Andr​​oid物理屏幕的高度？ [英] Is there a way to determine android physical screen height in cm or inches?

问题描述

我需要确切地知道有多大的屏幕是设备的长度真正的单位，所以我可以计算出重力加速度在每毫秒像素。

I need to know exactly how big the screen is on the device in real units of length so I can calculate the acceleration due to gravity in pixels per millisecond.

有没有一种方法某处为这个Android的API中？

Is there a method somewhere in the Android API for this?

推荐答案

使用以下内容：

    DisplayMetrics dm = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(dm);
    double x = Math.pow(mWidthPixels/dm.xdpi,2);
    double y = Math.pow(mHeightPixels/dm.ydpi,2);
    double screenInches = Math.sqrt(x+y);
    Log.d("debug","Screen inches : " + screenInches);

在mWidthPixels和mHeightPixels从下方code采取

When mWidthPixels and mHeightPixels are taken from below code

private void setRealDeviceSizeInPixels()
{
    WindowManager windowManager = getWindowManager();
    Display display = windowManager.getDefaultDisplay();
    DisplayMetrics displayMetrics = new DisplayMetrics();
    display.getMetrics(displayMetrics);


    // since SDK_INT = 1;
    mWidthPixels = displayMetrics.widthPixels;
    mHeightPixels = displayMetrics.heightPixels;

    // includes window decorations (statusbar bar/menu bar)
    if (Build.VERSION.SDK_INT >= 14 && Build.VERSION.SDK_INT < 17)
    {
        try
        {
            mWidthPixels = (Integer) Display.class.getMethod("getRawWidth").invoke(display);
            mHeightPixels = (Integer) Display.class.getMethod("getRawHeight").invoke(display);
        }
        catch (Exception ignored)
        {
        }
    }

    // includes window decorations (statusbar bar/menu bar)
    if (Build.VERSION.SDK_INT >= 17)
    {
        try
        {
            Point realSize = new Point();
            Display.class.getMethod("getRealSize", Point.class).invoke(display, realSize);
            mWidthPixels = realSize.x;
            mHeightPixels = realSize.y;
        }
        catch (Exception ignored)
        {
        }
    }

请参阅这篇文章以供参考： 如何获得屏幕尺寸

See this post for reference: How to get screen dimensions

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