Android: ImageView scale to screen width within a ScrollView

问题

I'm quite new to android programming and I stumbled upon a problem with my layout.

At first, I had a Linearlayout with a textview, 2 buttons and a imageview scaled to fit the screen.

Now I wanted to put this under a scrollview, so the imageview could be scaled larger (to the width of the screen).

Without the scrollview everything just went fine, but with the scrollview, my imageview is not scaled anymore.

What am I doing wrong? I tried numerous solutions on StackOverflow but I can't get it to work with a ScrollView. Thanks in advance!

<?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="wrap_content">
<LinearLayout
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="@string/pageno" />

    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="@string/texta" />

    <Button
        android:id="@+id/button2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="@string/textb" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:adjustViewBounds="true"
        android:scaleType="fitCenter"
        android:src="@drawable/page1" />

</LinearLayout>
</ScrollView>

回答1:

Make LinearLayout/RelativeLayout as parent view. In that make a scroll view and set alignparentTop=true. This scrollView will contain a single layout in which all other views will be placed.

来源：https://stackoverflow.com/questions/15616605/android-imageview-scale-to-screen-width-within-a-scrollview