How do I add a ScrollView to a constraint layout?

Question

I'm very new at coding, I'm in Android Basics at Udacity. I have a constraint layout with various TextViews and ImageViews and need to add a scroll bar for an assignment. I tried adding the scrollview outside of the layout, that made the app crash, then in the layout with the other views as children of the scrollview within the constraint layout, but an error came up stating that there can be only one child for the scroll view. Why is that? How do I add a scrollview?

`<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:orientation="vertical" >
    <ScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:fillViewport="true">


    <TextView
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:text="Hello World"
        android:textSize="25sp"
        android:textColor="#990099" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:text="Words"
        android:textSize="25sp"
        android:textColor="#990099"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:text="Words"
        android:textSize="25sp"
        android:textColor="#990099"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:text="Words"
        android:textSize="25sp"
        android:textColor="#990099"/>
    </ScrollView>
</LinearLayout>
`

UPDATE I tried this, but the app crashes.

advice · Accepted Answer · 2018-07-26 01:55:46Z

3

When using a ScrollView, it can only have one child. You'll usually want to use a LinearLayout, and that is where you'll put your actual content.

<ScrollView>
    <LinearLayout>
         <!-- Your Content --> 
    </LinearLayout>
</ScrollView>

This will give the ScrollView the knowledge it needs to scroll. Just make sure to set the orientation of your LinearLayout, such as vertical.

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:fillViewport="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingLeft="16dp"
        android:paddingRight="16dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="100dp"
            android:text="Hello World"
            android:textColor="#990099"
            android:textSize="25sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="100dp"
            android:text="Words"
            android:textColor="#990099"
            android:textSize="25sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="100dp"
            android:text="Words"
            android:textColor="#990099"
            android:textSize="25sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="100dp"
            android:text="Words"
            android:textColor="#990099"
            android:textSize="25sp" />

    </LinearLayout>
</ScrollView>

edited Jul 26, 2018 at 1:55

answered Jul 24, 2018 at 22:19

advice

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4 Comments

Brianna Childers Over a year ago

I always get an error when I add the scroll view outside the linear layout

Brianna Childers Over a year ago

Namespace Android is not found

advice Over a year ago

I updated my answer, using your layout. This works fine for me.

advice Over a year ago

No problems. Have fun!

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