约束布局不匹配滚动视图高度

Question

我在约束布局中添加了一个图片和一个标题布局，这些内容不应该滚动，同时还有一个包含其他视图的约束布局的滚动视图。当我尝试调整滚动视图内部的约束布局大小时，宽度会相应地改变，但高度没有改变。我希望约束布局的高度与其滚动视图的高度匹配，因为我打算添加更多的文本框和按钮用于注册表单。目前两个框被挤压，并且约束布局的高度没有增加。

<?xml version="1.0" encoding="utf-8"?>
    <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"
    android:background="@color/MistyRose"
    android:orientation="vertical"
    android:paddingLeft="16dp"
    android:paddingTop="16dp"
    android:paddingRight="16dp"
    android:paddingBottom="16dp">

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="203dp"
        android:layout_height="95dp"

        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:src="@drawable/logo"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.497"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="70dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:text="Register"
        android:textColor="@color/Black"
        android:textSize="40dp"
        android:textStyle="italic"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/imageView2"
        app:layout_constraintVertical_bias="0.016" />

    <ScrollView
        android:id="@+id/scrollView2"
        android:layout_width="400dp"
        android:layout_height="250dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="32dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.6"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textView"
        app:layout_constraintVertical_bias="0.0">

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

            <EditText
                android:layout_width="350dp"
                android:layout_height="46dp"
                android:layout_marginStart="8dp"
                android:layout_marginEnd="8dp"
                android:background="@drawable/edittext"
                android:hint="Name"
                android:inputType="text"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.0"
                app:layout_constraintStart_toStartOf="parent"
                tools:layout_editor_absoluteY="12dp" />

    <EditText
                android:layout_width="350dp"
                android:layout_height="46dp" 
                android:layout_marginStart="16dp"
                android:layout_marginTop="16dp"
                android:background="@drawable/edittext"
                android:hint="Email"
                android:inputType="textEmailAddress"
                />


        </androidx.constraintlayout.widget.ConstraintLayout>

    </ScrollView>

    </androidx.constraintlayout.widget.ConstraintLayout>

- Thomas A Mathew

Answer 1

您应该为滚动视图容器中的视图添加一些约束，并使用 android:fillViewport="true" 属性使滚动视图拉伸其内容以填充视口。

代码如下：

<?xml version="1.0" encoding="utf-8"?>
<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"
        android:background="@color/MistyRose"
        android:orientation="vertical"
        android:paddingLeft="16dp"
        android:paddingTop="16dp"
        android:paddingRight="16dp"
        android:paddingBottom="16dp">

    <ImageView
            android:id="@+id/imageView2"
            android:layout_width="203dp"
            android:layout_height="95dp"

            android:layout_marginStart="8dp"
            android:layout_marginTop="32dp"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="8dp"
            android:src="@drawable/logo"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.497"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintVertical_bias="0.0" />

    <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="70dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="32dp"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="8dp"
            android:text="Register"
            android:textColor="@color/Black"
            android:textSize="40dp"
            android:textStyle="italic"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/imageView2"
            app:layout_constraintVertical_bias="0.016" />

    <ScrollView
            android:id="@+id/scrollView2"
            android:layout_width="400dp"
            android:layout_height="250dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="32dp"
            android:layout_marginEnd="8dp"
            android:layout_marginBottom="8dp"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintHorizontal_bias="0.6"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/textView"
            app:layout_constraintVertical_bias="0.0" android:fillViewport="true">

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

            <EditText
                    android:layout_width="350dp"
                    android:layout_height="46dp"
                    android:layout_marginStart="8dp"
                    android:background="@drawable/edittext"
                    android:hint="Name"
                    android:inputType="text"
                    app:layout_constraintStart_toStartOf="parent"
                    android:layout_marginTop="8dp" app:layout_constraintTop_toTopOf="parent"
                    android:id="@+id/editText" android:layout_marginEnd="8dp"
                    app:layout_constraintEnd_toEndOf="parent"/>

            <EditText
                    android:layout_width="350dp"
                    android:layout_height="46dp"
                    android:background="@drawable/edittext"
                    android:hint="Email"
                    android:inputType="textEmailAddress"
                    android:layout_marginTop="8dp"
                    app:layout_constraintTop_toBottomOf="@+id/editText" android:layout_marginStart="8dp"
                    app:layout_constraintStart_toStartOf="parent" android:layout_marginEnd="8dp"
                    app:layout_constraintEnd_toEndOf="parent"/>


        </androidx.constraintlayout.widget.ConstraintLayout>

    </ScrollView>

</androidx.constraintlayout.widget.ConstraintLayout>

- Nicola Gallazzi