Scrollview inside constraint layout does not scrol

问题:

I have a form which has around 12/13 fields. I used a Scrollview inside a constraint layout. Below is the hierarchy of the XML layout. The problem is, it doesn't scroll to the bottom instead scrolls only to the first initial 10 views. The last 3 fields gets hidden as the view does not scroll any further.

PARENT LAYOUT

<android.support.constraint.ConstraintLayout 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"
android:id="@+id/activity_register"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:focusableInTouchMode="true"
android:orientation="vertical">

<!-- Textview and a button -->

  <ScrollView
    android:id="@+id/scrollView"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginBottom="10dp"
    android:layout_marginTop="10dp"
    android:orientation="vertical"
    android:overScrollMode="never"
    android:scrollbars="none"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/view"
    tools:layout_constraintBottom_creator="1"
    tools:layout_constraintLeft_creator="1"
    tools:layout_constraintRight_creator="1"
    tools:layout_constraintTop_creator="1"
    tools:layout_editor_absoluteX="0dp"
    tools:layout_editor_absoluteY="0dp">


  <android.support.constraint.ConstraintLayout
        android:id="@+id/constraintLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

                <!-- Child Views (12/13 views of the fields)-->

  </android.support.constraint.ConstraintLayout>

</ScrollView>

</android.support.constraint.ConstraintLayout>

回答1:

This layout works in my app. The trick is to set these two attributes in ScrollView: android:layout_height="0dp" app:layout_constraintBottom_toBottomOf="parent"

The simplified layout from my app:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:theme="@style/ThemeOverlay.AppCompat.Light">

    <RelativeLayout
        android:id="@+id/linear"
        android:layout_width="0dp"
        android:layout_height="56dp"
        android:background="@color/title"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <ScrollView
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/linear">

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/titleView"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:text="@string/title"
                android:textSize="14sp"
                app:layout_constraintBaseline_toBaselineOf="@+id/title"
                app:layout_constraintLeft_toLeftOf="parent" />

            <EditText
                android:id="@+id/title"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginEnd="8dp"
                android:layout_marginRight="8dp"
                android:hint="toilet title"
                android:inputType="text"
                android:textColor="@android:color/holo_red_dark"
                android:textSize="12sp"
                app:layout_constraintLeft_toLeftOf="@+id/open_hour"
                app:layout_constraintLeft_toRightOf="@+id/titleView"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="parent" />
            ...
            Other Views in ScrollView
            ...
        </android.support.constraint.ConstraintLayout>
    </ScrollView>
</android.support.constraint.ConstraintLayout>

回答2:

Two Steps

1. Keep layout height for scroll view zero
   android:layout_height="0dp"

2. Again for scroll view
   android:fillViewport="true"

回答3:

In my case NestedScrollView worked instead of ScrollView. Following is the snippet of my working layout:

<android.support.constraint.ConstraintLayout 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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- Some Views Here -->

    <android.support.v4.widget.NestedScrollView
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:fillViewport="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/view">

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <!-- Some Views That can be Scrolled Here -->

        </android.support.constraint.ConstraintLayout>

    </android.support.v4.widget.NestedScrollView>

</android.support.constraint.ConstraintLayout>

回答4:

Try adding bottom constraint to scrollview (eg: app:layout_constraintBottom_toBottomOf="parent") and change android:layout_height="wrap_content" to android:layout_height="0dp"

回答5:

You have two solutions for this problem (the same solution but in two ways to do it):

1. If you put the Design mode in Android Studio, select your ScrollView and open attributes tab and in the layout_height, select "match_constraint".

2. If you use the Text mode in Android Studio, use this:

   <ScrollView
   android:layout_width="match_parent"
   android:layout_height="0dp"
   app:layout_constraintBottom_toBottomOf="parent"
   app:layout_constraintTop_toBottomOf="@id/tb_details">
   

See that the ScrollView height is set to 0dp. Both of this ways resolve the same problem but these are the different ways to do it.

The ScrollView is not the root view, I have a Constraint layout wrapping the ScrollView as you.

回答6:

In my case NestedScrollView worked instead of ScrollView.

Following is the snippet of my working layout: Please make sure that you haven't make any childview height to match parent(0 dp) inside constrianlayout also for scroll view android:fillViewport="true;

Ask me if any doubt Occur.

<android.support.v4.widget.NestedScrollView
        android:id="@+id/scroll_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="@dimen/_90sdp"
        android:fillViewport="true">

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:id="@+id/cvLayout"
            android:animateLayoutChanges="true">

回答7:

Just Put android:fillViewport="true" in Parent Layout

回答8:

In my case, I had a tall TextView (height set to wrap_content) inside a ScrollView (height set to 0dp and being constraint on the top and bottom). No suggestions worked, but I solved the problem by wrapping the TextView inside a FrameLayout (height set to wrap_content).

回答9:

For me, I needed to add a LinearLayout inside my ScrollView in order to constrain it

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


    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        tools:layout_editor_absoluteX="1dp">

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

            <View....</View>

        </LinearLayout>

    </ScrollView>


</androidx.constraintlayout.widget.ConstraintLayout>