试图了解ScrollView内LinearLayout中的边距 [英] Trying to understand margins in LinearLayout inside a ScrollView

问题描述

我需要在SrollView内有一个LinearLayout，并且LinearLayout必须与ScrollView之间有一个边距.首先，我想解决该问题的唯一方法是在另一个LinearLayout内放置一个LinearLayout，并在最后一个布局上设置边距.如果将它们设置在外部LinearLayout.

I need to have a LinearLayout inside a SrollView and that LinearLayout must have a margin from the ScrollView. At first, the only way I could think of to solve that issue was having a LinearLayout inside another LinearLayout with the margins set on the this last layout. They wouldn't work if they were set in the outer LinearLayout.

示例:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:fillViewport="true"
    android:background="@color/layout_color_green">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:background="@color/layout_color_yellow">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_margin="10dp"
            android:orientation="vertical"
            android:background="@color/layout_color_blue">
        </LinearLayout>
    </LinearLayout>
</ScrollView>

我的问题是:我为什么需要这样做?

如果我只有一个LinearLayout，就没有边距...

If I had only one LinearLayout there would be no margins...

示例:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:fillViewport="true"
    android:background="@color/layout_color_green">
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="10dp"
        android:orientation="vertical"
        android:background="@color/layout_color_blue">
    </LinearLayout>
</ScrollView>

然后，在寻找类似问题时，我发现了一些布局，这些布局使我有了在ScrollView中使用填充而不是在LinearLayout中使用空白的想法.这也解决了我的问题，并且我不需要在另一个内部插入LinearLayout.这是一个更优雅的解决方案.

Then, searching for some similar issue, I found a few layouts which gave me the idea of using padding in the ScrollView instead of margin in the LinearLayout. This also solves my problem and I don't need a LinearLayout inside another one. It's a more elegant solution.

仍然，我想了解为什么ScrollView内的LinearLayout内的简单边距不起作用.因为如果不在ScrollView内，它也可以正常工作.

Still, I would like to understand why the simple margin inside the LinearLayout doesn't work when inside a ScrollView. Because it does work fine if it's not inside a ScrollView.

有人知道为什么吗?

推荐答案

我稍微深入了一下源代码:

I digged a little bit into the source code:

ScrollView扩展FrameLayout.这本身就存在一些边距问题，并且ScrollView甚至没有尝试解决该问题.测量时，边距基本上被忽略.

ScrollView extends FrameLayout. This one has some margin issues itself and ScrollView is not even trying to solve that. The margins are basically ignored while measuaring.

但是最后没关系，因为您应该能够在ScrollView本身上定义填充(这是肯定的，没有尝试过).单子视图应该不需要保证金.

But in the end it doesn't matter since you should be able to define a padding on the ScrollView itself (it's an affirmation, didn't try that). There should be no need for margin for a single child view.

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