具有约束布局的 NestedScrollView 不滚动

Question

我的 xml 由一个约束布局组成。其中有 2 个按钮和 1 个嵌套滚动视图。里面ScrollView有各种元素，包括回收视图。我希望回收视图不滚动，而只滚动嵌套的滚动视图。我在此模式 ( recyclerView.setNestedScrollingEnabled(false);) 中禁用了回收视图的滚动，但问题是嵌套滚动视图不滚动。你能帮助我吗？我附上下面的代码。

代码以这种模式开始：

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

<android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <TextView
    android:id="@+id/azzera"
    android:layout_width="120dp"
    android:layout_height="40dp"
    android:layout_marginStart="40dp"
    android:layout_marginBottom="28dp"
    android:background="@drawable/rounded_4lati"
    android:backgroundTint="@color/azzurro"
    android:elevation="@dimen/dimen8"
    android:paddingTop="@dimen/dimen8"
    android:text="@string/azzera"
    android:textAlignment="center"
    android:textColor="#FFFFFF"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintStart_toStartOf="parent" />

<TextView
    android:id="@+id/conferma"
    android:layout_width="120dp"
    android:layout_height="40dp"
    android:layout_marginEnd="16dp"
    android:layout_marginBottom="28dp"
    android:background="@drawable/rounded_4lati"
    android:backgroundTint="@color/azzurro"
    android:paddingTop="@dimen/dimen8"
    android:text="@string/conferma"
    android:textAlignment="center"
    android:textColor="#FFFFFF"
    android:elevation="@dimen/dimen8"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent" />

<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    >

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

        <View
            android:id="@+id/view1"
            android:layout_width="0dp"
            android:layout_height="48dp"
            android:background="@color/white"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <View
            android:id="@+id/view2"
            android:layout_width="0dp"
            android:layout_height="48dp"
            android:layout_marginTop="16dp"
            android:background="@color/white"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/view1" />

        <View
            android:id="@+id/view3"
            android:layout_width="0dp"
            android:layout_height="48dp"
            android:layout_marginTop="16dp"
            android:background="@color/white"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/view2" />

        <TextView
            android:id="@+id/mostraPreferiti"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:text="@string/mostraPreferiti"
            android:textColor="@color/black"
            android:textSize="18sp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/view3" />

        <TextView
            android:id="@+id/creditiEcm"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="10dp"
            android:text="@string/creditiECM"
            android:textColor="@color/black"
            android:textSize="18sp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/view1" />

        <EditText
            android:id="@+id/editText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:inputType="number"
            android:hint="@string/zero"
            android:text="@string/editText"
            android:textStyle="bold"
            app:layout_constraintStart_toEndOf="@+id/creditiEcm"
            app:layout_constraintTop_toTopOf="@+id/view1"
            android:autofillHints="" />

        <Button
            android:id="@+id/buttonMeno"
            android:layout_width="36dp"
            android:layout_height="36dp"
            android:layout_marginTop="6dp"
            android:layout_marginEnd="16dp"
            android:background="@drawable/ic_remove_circle_azzurro_24dp"
            android:gravity="center"
            android:textAlignment="gravity"
            android:textColor="@color/azzurro"
            android:textSize="24sp"
            app:layout_constraintEnd_toStartOf="@+id/buttonPiu"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@+id/buttonPiu"
            android:layout_width="36dp"
            android:layout_height="36dp"
            android:layout_marginTop="6dp"
            android:layout_marginEnd="32dp"
            android:background="@drawable/ic_add_circle_azzurro_24dp"
            android:gravity="center"
            android:textAlignment="gravity"
            android:textColor="@color/azzurro"
            android:textSize="24sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/mostraCorsiPassati"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="8dp"
            android:text="@string/mostraCorsiPassati"
            android:textColor="@color/black"
            android:textSize="18sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="@+id/view2"
            app:layout_constraintTop_toTopOf="@+id/view2" />


        <Switch
            android:id="@+id/switch_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="32dp"
            android:theme="@style/SwitchTheme"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="@+id/view2" />

        <Switch
            android:id="@+id/switch_button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="32dp"
            android:theme="@style/SwitchTheme"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="@+id/view3" />

        <android.support.v7.widget.AppCompatTextView
            android:id="@+id/professioni"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="90dp"
            android:layout_marginEnd="8dp"
            android:text="@string/professione2"
            android:textColor="@color/black"
            android:textSize="18sp"
            android:textStyle="bold"
            app:fontFamily="@font/sanfrancisco"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/mostraCorsiPassati" />


        <SearchView
            android:id="@+id/searchBar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="4dp"
            android:background="#fff"
            android:elevation="2dp"
            app:layout_constraintHorizontal_bias="0.557"
            app:layout_constraintLeft_toRightOf="parent"
            app:layout_constraintRight_toLeftOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/professioni"
            app:queryHint="Cerca..">

        </SearchView>

        <android.support.v7.widget.RecyclerView
            android:id="@+id/listProfessioni"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toStartOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/searchBar"
            android:orientation="vertical"
            >


        </android.support.v7.widget.RecyclerView>



        <TextView
            android:id="@+id/professioniNonDisponibili"
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="16dp"
            android:layout_marginEnd="8dp"
            android:text="@string/professioniNonDisponibili"
            android:textAlignment="center"
            android:textColor="@color/gray"
            android:textSize="18sp"
            app:autoSizeMaxTextSize="@dimen/dimen20"
            app:autoSizeMinTextSize="@dimen/dimen12"
            app:autoSizeTextType="uniform"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="1.0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/error" />

        <ImageView
            android:id="@+id/error"
            android:layout_width="@dimen/dimen80"
            android:layout_height="@dimen/dimen80"
            android:layout_marginStart="8dp"
            android:layout_marginTop="32dp"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="8dp"
            android:background="@drawable/ic_error_outline_gray_24dp"
            android:contentDescription="@string/TODO"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/searchBar"
            app:layout_constraintVertical_bias="0.105" />


        <ProgressBar
            android:id="@+id/progress"
            android:layout_width="60dp"
            android:layout_height="60dp"

            android:layout_marginStart="8dp"
            android:layout_marginTop="24dp"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="8dp"
            android:alpha="1"
            android:minWidth="80dp"
            android:minHeight="80dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@+id/searchBar"
            app:layout_constraintVertical_bias="0.168" />

    </android.support.constraint.ConstraintLayout>


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

Answer 1

正如我在评论中回答的那样

对于其他面临同样问题的人。这可能会有所帮助。

由于某些原因ScrollView，ConstraintLayout在里面时不会滚动。

对于解决方法，我们可以在 内部使用LinearLayout 或RelativeLayout代替 ConstraintLayout ScrollView。或者

因为 OP 确实把ConstraintLayout里面的东西放在了里面Linear or Relative Layout。

Answer 2

根据 Ali Ahmed 的回答，ScrollView如果ConstraintLayout里面有 a ，则 a不会滚动。那不是真的。我一直ConstraintLayout在内部使用ScrollView，一切正常。很好用的代码，您发布的问题是，你正在使用0dp作为layout_height您的RecyclerView。0dp是指match_parent。您应该使用wrap_content作为您的layout_height. 以便RecyclerView根据其中的元素扩展其高度。这样做将使您的代码正常工作。