@ dimen/activity_vertical_margin有什么作用?

问题描述

在以下代码中:

<LinearLayout
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.example.android.ashokaquiz.MainActivity">

@dimen/activity_vertical_margin的作用是什么?我找不到任何文档.我知道什么是填充.我只想知道@dimen/activity_vertical_margin位.

What does @dimen/activity_vertical_margin do? I cannot find any documentation for it. I know what padding is. I just want to know about the @dimen/activity_vertical_margin bit.

谢谢.

推荐答案

@dimen是指尺寸，它是一个文件，您可以在其中定义尺寸，以便以后在任何布局文件中使用它们.

@dimen refers to dimension and it's a file where you define dimensions to use them later from in any layout file.

它位于res/values/dimens中.这是该文件的示例:

It's located in res/values/dimens. Here's what a sample of the file look like:

 <resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
 </resources>

这里activity_veritcal_margin = 16 dp.

Here activity_veritcal_margin = 16 dp.

并像这样使用它:

<LinearLayout
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin">

在这里，我们将此线性布局的底部填充设为16dp.

Here we give this linear layout a bottom padding with 16dp.

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