android - 约束 View 内的 ListView 被剪切并且不滚动

Question

我的 ConstraintLayout 中有一个 ListView ，我读到它应该自动可滚动，但列表只是在底部被截断，还有更多项目要显示并且不可滚动，我不知道我是否设置了一些属性错误或者我是否必须添加一些内容让 ListView 滚动？

这是我的代码

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <TextView
        android:id="@+id/special_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@android:color/white"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="Today is:"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        android:visibility="gone"
        app:layout_constraintTop_toTopOf="parent"/>

    <TextView
        android:id="@+id/date_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@android:color/white"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="The date is:"
        android:textSize="24sp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/special_text_view"/>



     <TextView
            android:id="@+id/oc_text_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="@android:color/white"
            android:layout_marginLeft="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginTop="8dp"
            android:text="The day of the omer is:"
            android:visibility="gone"
            android:textSize="24sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/date_text_view"/>

    <ListView
            android:id="@+id/list_view"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_marginTop="24dp"
            android:layout_marginBottom="24dp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@id/oc_text_view"
            app:layout_constraintBottom_toBottomOf="parent">
    </ListView>

    </android.support.constraint.ConstraintLayout>

谢谢

Answer 1

您需要关闭链条，如下所示:

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


    <TextView
        android:id="@+id/special_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="Today is:"
        android:textColor="@android:color/white"
        android:textSize="24sp"
        android:visibility="gone"
        app:layout_constraintBottom_toTopOf="@id/date_text_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/date_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="The date is:"
        android:textColor="@android:color/white"
        android:textSize="24sp"
        app:layout_constraintBottom_toTopOf="@id/oc_text_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/special_text_view" />


    <TextView
        android:id="@+id/oc_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:text="The day of the omer is:"
        android:textColor="@android:color/white"
        android:textSize="24sp"
        android:visibility="gone"
        app:layout_constraintBottom_toTopOf="@id/list_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/date_text_view" />

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginBottom="24dp"
        android:layout_marginTop="24dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/oc_text_view">
    </ListView>
</android.support.constraint.ConstraintLayout>