HorizontalScrollView Not Scrolling Completely to the Right

Question

My Current Implementation

I have a HorizontalScrollView which I create in XML that houses a few LinearLayout children. I have added this code below.

There are two LinearLayout containers with the id's group_one and group_two and these are populated programmatically at run time.

I also fix the width of the HorizontalScrollView at run time depending on the amount of View objects I will be inserting.

This solution works great for when the children fit in the HorizontalScrollView without the need to scroll.

The Issue

As soon as I need to scroll (there are more children than can be displayed within the fixed width HorizontalScrollView) then the scrollbar will not go all the way to the right, even though I can see that the child layout is of the correct width, and I can see the scrollbar just will not go any further.

My Question

Why would there be a limit on the scrollbar moving any further right?

My Code

HorizontalScrollView XML

<!-- THIS IS WHERE THE PLUGIN BUTTONS ARE HOUSED -->
    <HorizontalScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="horizontal"
        android:id="@+id/map_plugin_scroll_view"
        android:background="@color/map_plugin_background">

    <!-- Enclosing box to layout the two groups.-->
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_margin="8dp"
        android:id="@+id/group_container">

        <!-- These layouts contain the map plugins. -->
        <LinearLayout
            android:id="@+id/group_one"
            android:orientation="horizontal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="4dp"/>

        <LinearLayout
            android:id="@+id/group_two"
            android:orientation="horizontal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="4dp"/>

    </LinearLayout>

</HorizontalScrollView>

What Is Happening

This is an image of the correct scroll to the left. The edge of the scroll view starts on the right of the red bar. Notice the distance between the two.

This is an image of the incorrect scroll right. Compare the distances between the edges of the scroll view and where the scroll bar is stopping.

This is how I want it to look when I scroll at either end.

Answer 1

I have been playing with this for a while now and finally found the solution.

I was trying to add the left and right margins to the LinearLayout with the ID group_container. However for some reason the HorizontalScrollView was not respecting this and this is why I was seeing this issue.

Instead I added the left and right margins to the group_one and group_two LinearLayouts. Now the HorizontalScrollView respected these and it functions as I expected. Here is my modified code.

<HorizontalScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:scrollbars="horizontal"
        android:id="@+id/map_plugin_scroll_view"
        android:background="@color/map_plugin_background">

        <!-- Enclosing box to layout the two groups.-->
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_marginTop="8dp"
            android:layout_marginBottom="8dp"
            android:id="@+id/group_container">

            <!-- These layouts contain the map plugins. -->
            <LinearLayout
                android:id="@+id/group_one"
                android:orientation="horizontal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginBottom="4dp"
                android:layout_marginLeft="8dp"
                android:layout_marginRight="8dp"/>

            <LinearLayout
                android:id="@+id/group_two"
                android:orientation="horizontal"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="4dp"
                android:layout_marginLeft="8dp"
                android:layout_marginRight="8dp"/>

        </LinearLayout>

    </HorizontalScrollView>