ScrollView adds large space at the bottom

Question

My main Activity has a number of buttons, that fit below each other on a large Tablet screen, but not on a smaller Phone screen. I added a ScrollView, so that the user can scroll down to the other buttons if the screen size requires it:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          android:orientation="vertical"
          android:background="@drawable/bg"
          android:gravity="center_horizontal">

    <TextView
        android:id="@+id/trackSelectorText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"/>

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"                
            android:gravity="center_horizontal">

        <Button                    
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="foo" />
        <!-- More buttons -->
        </LinearLayout>
    </ScrollView>
</LinearLayout>

This kinda works, however I have a large blank space below the last button (i.e. the ScrollView can scroll down too far). Both on an actual Tablet and on the emulator with a Phone configuration. If I center the inner LinearLayout (instead of center_horizontal), the space is evenly spread between the top and the bottom, which I don't want neither. How do I fix this layout?

I hope this image makes it more clear, imagine that the ScrollView has been completely scrolled down and showing the last buttons. The blank space I mean is the one below Button 6 on the right image:

Answer 1

实际上,它与布局没有关系(除非我遗漏了什么).我试着评论背景归属,它突然起作用了.背景imaged(@drawable/bg)太大了,导致滚动.我将背景转换为9个补丁图像,因此它可以自动缩放,而且,额外的空间消失了.尽管如此,如果没有9补丁可以实现这一点,我仍然有兴趣听听是否可以在XML文件中完成.

Answer 2

尝试将此属性添加到ScrollView元素.机器人:fillViewport = "真"

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_weight="1"
    android:fillViewport="true" > ... </ScrollVIew>

参考:ScrollView参考