Question

我的ConstraintLayout里面有一个listview，我读它应该是自动滚动的，但是列表只是在底部截止，剩下更多的项目显示它不可滚动，我不知道我是否设置了一些属性错误或者我必须为listview添加一些东西来滚动？

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>

由于

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>

Answer 2

使用ConstraintLayout时，您必须为constraintTop，constraintRight，constraintBottom，constraintLeft或constraintStart和constraintEnd添加约束。请约束constrant布局的所有四边（或使用Constraint Start或End）。然后只有它按预期工作

use below code in list view:
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"

供参考： https://developer.android.com/training/constraint-layout/index.html enter link description here

Answer 3

试试这个...

这里我在ListView中填充了10个项目。见附件。

@api.onchange('end_date')
def onchange_end_date(self):
    if (self.start_date and self.end_date) and (self.start_date < self.end_date):
        raise exceptions.except_orm(_('Warning!'),_('The start date must be less than to the end date.'))

结果：

Answer 4

使用androidx.constraintlayout.widget.ConstraintLayout，您可以尝试以下操作：

<?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"
    >

<TextView
    android:id="@+id/special_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="Today is:"
    android:textColor="@android:color/black"
    android:textSize="24sp"
    android:visibility="visible"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintLeft_toLeftOf="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_marginBottom="8dp"
    android:layout_marginLeft="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="8dp"
    android:text="The date is:"
    android:textColor="@android:color/black"
    android:textSize="24sp"
    app:layout_constraintBottom_toTopOf="@+id/oc_text_view"
    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:layout_marginLeft="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="16dp"
    android:text="The day of the omer is:"
    android:textColor="@android:color/black"
    android:textSize="24sp"
    android:visibility="visible"
    app:layout_constraintBottom_toTopOf="@+id/guideline1"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.47"
    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="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="@+id/guideline1"
    app:layout_constraintVertical_bias="1.0"
    >
</ListView>

<androidx.constraintlayout.widget.Guideline
    android:id="@+id/guideline1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    app:layout_constraintGuide_percent="0.3"
    />

</androidx.constraintlayout.widget.ConstraintLayout>

约束视图中的ListView被剪切而不是滚动

4 个答案: