ScrollView 内的视图不会全部发生 [英] View inside ScrollView doesn't take all place

问题描述

我在 ScrollView 中有一个 RelativeLayout.我的 RelativeLayout 有 android:layout_height="match_parent" 但视图没有采用整个尺寸，它就像一个 wrap_content.

I have a RelativeLayout inside a ScrollView. My RelativeLayout has android:layout_height="match_parent" but the view doesn't take the entire size, it's like a wrap_content.

有没有办法实现真正​​的 fill_parent/match_parent 行为?

Is there a way to have the real fill_parent/match_parent behavior ?

我的布局:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

    <ImageView
    android:id="@+id/top"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:scaleType="fitXY"
    android:src="@drawable/top" />

    <ImageView
    android:id="@+id/header"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/top"
    android:scaleType="fitXY"
    android:src="@drawable/headerbig" />

    <ImageView
    android:id="@+id/logo"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/header"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="3dp"
    android:src="@drawable/logo" />

    <ScrollView
    android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/bottom"
    android:layout_below="@+id/logo"
    android:background="@drawable/background" >

        <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">

             <ImageView
            android:id="@+id/dashboard01"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_above="@+id/dashboard02"
            android:layout_centerHorizontal="true"
            android:layout_marginBottom="30dp"
            android:src="@drawable/dashboard01"
            android:visibility="visible" />

            <ImageView
            android:id="@+id/dashboard02"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:layout_alignParentRight="true"
            android:layout_marginRight="10dp"
            android:src="@drawable/dashboard02" />

             <ImageView
            android:id="@+id/dashboard03"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/dashboard02"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="40dp"
            android:src="@drawable/dashboard03"
            android:visibility="visible" />
         </RelativeLayout>
    </ScrollView>

    <ImageView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_below="@+id/logo"
    android:layout_centerHorizontal="true"
    android:scaleType="fitXY"
    android:src="@drawable/bar" />

    <ImageView
    android:id="@+id/bottom"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:scaleType="fitXY"
    android:src="@drawable/bottom" />

</RelativeLayout>

推荐答案

尝试将 android:fillViewport="true" 添加到您的 ScrollView

Try adding android:fillViewport="true"to your ScrollView

请记住，android:layout_height="fill_parent" 的意思是将高度设置为父级的高度".在使用 ScrollView 时，这显然不是您想要的.毕竟，如果 ScrollView 的内容总是和它本身一样高，它就会变得毫无用处.要解决此问题，您需要使用名为 android:fillViewport 的 ScrollView 属性.当设置为 true 时，如果需要，此属性会导致滚动视图的子级扩展到 ScrollView 的高度.当孩子比ScrollView高时，该属性无效.

remember that android:layout_height="fill_parent" means "set the height to the height of the parent." This is obviously not what you want when using a ScrollView. After all, the ScrollView would become useless if its content was always as tall as itself. To work around this, you need to use the ScrollView attribute called android:fillViewport. When set to true, this attribute causes the scroll view’s child to expand to the height of the ScrollView if needed. When the child is taller than the ScrollView, the attribute has no effect.

http://www.curious-creature.org/2010/08/15/scrollviews-handy-trick/

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