How insert fixed footer outside scroll view in constrain layout inside scrollview-CodePudding

I want to insert fixed footer bottom of the screen and above should be content in scroll view I used below code but it's throwing exception ScrollView can host only one direct child

<layout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">
    <data>
        <variable
            name="mainActivity"
            type="com.example.footer.MainActivity" />
    </data>

<androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <Button
            android:id="@ id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
    </ScrollView>

    <TextView
        android:id="@ id/footer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/black"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</layout>

CodePudding user response：

Try is, it might be what you're looking for

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

<!--        ScrollView can only contain 1 view inside-->
        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="0dp"
            app:layout_constraintBottom_toTopOf="@ id/footer"
            app:layout_constraintTop_toTopOf="parent">

<!--            Use LinearLayoutCompat or ConstraintLayout or layout any-->
            <androidx.appcompat.widget.LinearLayoutCompat
                android:layout_width="match_parent"
                android:orientation="vertical"
                android:layout_height="match_parent">

                <Button
                    android:id="@ id/button"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    app:layout_constraintBottom_toBottomOf="parent"
                    app:layout_constraintLeft_toLeftOf="parent"
                    app:layout_constraintRight_toRightOf="parent"
                    app:layout_constraintTop_toTopOf="parent" />

            <!-- do some thing -->
            </androidx.appcompat.widget.LinearLayoutCompat>

        </ScrollView>

        <TextView
            android:id="@ id/footer"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/black"
            android:textStyle="bold"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent" />
 </androidx.constraintlayout.widget.ConstraintLayout>

CodePudding user response：

The constraints are not set correctly. You need to add id for the ScrollView and the TextView.
Then set the TextView top constraint to be bottom of ScrollView: layout_constraintTop_toBottomOf="@ id/scrollviewid"
And ScrollView bottom constraint to be top of TextView:
layout_constraintBottom_toTopOf="@ id/textviewid"