Android 状态栏要求图标尺寸为 25x25dp，而指南建议尺寸为 32x32dp。谁错了？
根据android图标设计指南（此处，参见表#1），开发者需要提供状态下一尺寸的栏图标：
Status Bar 24 x 24 px (LDPI) 32 x 32 px (MDPI) 48 x 48 px (HDPI)
虽然我的测量显示状态栏始终具有 25 dp 的高度，并且期望图标为 25x25dp。这转化为这些尺寸：
Status Bar 19 x 19 px (LDPI) 25 x 25 px (MDPI) 38 x 38 px (HDPI)
以下是我获取这些尺寸的方法：
25dp * 0.75 = 18.75 => 19px (LDPI)
25dp * 1 = 25 => 25px (MDPI)
25dp * 1.5 = 37.5 => 38px (HDPI)
我已经在几款 Android 手机和模拟器上确认了计算的尺寸。
问题基本上是：为什么指南使用的尺寸与状态栏实际使用的尺寸不同？
PS 由于精确的像素控制要求，我实际上需要打破准则。我只是对这种状况感到困惑。所以解释为什么会这样对我很有帮助。
According to android icon design guidelines (here, see table #1), developer needs to provide status bar icons of next sizes:
Status Bar 24 x 24 px (LDPI) 32 x 32 px (MDPI) 48 x 48 px (HDPI)
While my measurements show that status bar always has 25 dp in height and expects icons of 25x25dp. This translates to these sizes:
Status Bar 19 x 19 px (LDPI) 25 x 25 px (MDPI) 38 x 38 px (HDPI)
Here is how I get those size:
25dp * 0.75 = 18.75 => 19px (LDPI)
25dp * 1 = 25 => 25px (MDPI)
25dp * 1.5 = 37.5 => 38px (HDPI)
I have confirmed calculated sizes on several Android phones and on emulators.
The question basically is: why guidelines use sizes different from what is really used by status bar?
P.S. I actually need to break guidelines due to precise pixel control requirements. And I just was confused by this state of affairs. So explanation of why this the way it is would really help me.
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实际上它是
它是 24dp 大小，2dp 填充，意味着 20dp 内容
px = dp * (dpi/160)
Actually it's
it's 24dp size with a 2dp padding , means 20dp content
px = dp * (dpi/160)
警告：无论答案在书写时是否正确，现在看起来都不正确。请参阅 https://www.google.com/design/spec/style/icons。 html 获取当前指南。
这似乎是一个错误。 （请注意，截至 2010 年 12 月 4 日，他们还交叉引用了该页面上的图 4 和图 5。）
正如 Lex 指出的，他们在 “状态栏图标”部分。
他们还规定在 25x25 的所有边上都有一个 2 像素的“安全框”，图标的形状必须适合其中，尽管看起来可以将一些与锯齿相关的内容突出显示，但仅在边上，对于这种类型的图标。 （这意味着您确实希望以 21x21 的尺寸为目标。）
Warning: regardless of whether or not the answer was correct when written, it appears not to be correct now. See https://www.google.com/design/spec/style/icons.html for the current guidelines.
It just seems to be an error. (Note that as of 2010-12-04, they've also crossed their references to figures 4 and 5 on that page.)
As Lex points out, they have the correct number further down, in the "Status bar icon" section.
They also dictate a 2-pixel "safeframe" on all sides at 25x25 which the shape of your icon must fit within, though it seems that it is okay to have some aliasing-related stuff stick out, but only on the sides, for this type of icon. (Meaning that you really want to aim for 21x21 at that size.)