约束布局中回收视图的行项目折叠而不是采用父级宽度 [英] Row item of recycle view in Constraint layout collapse instead taking parent width

问题描述

最近，我开始使用约束布局，但今天遇到了使用它的奇怪行为.当我将RelativeLayout用作root而不是fragment_holiday.xml中的ConstraintLayout时，输出符合预期，但我想知道ConstraintLayout出了什么问题.我的代码如下，片段，item_row

Recently, I started using Constraint layout but today encountered very strange behaviour using it. When I am using RelativeLayout as root instead of ConstraintLayout in fragment_holiday.xml output is as expected but I want to know what is wrong with ConstraintLayout. My code is as follows for fragment,item_row

然后我得到约束布局为的输出(滚动时，它显示了不同的行为，正如我在共享的屏幕快照中看到的那样)-

And I am getting output with constraint layout as(And on scrolling it is showing different beheviour as you can see in screenshot I am sharing) ---

fragment_holiday.xml

fragment_holiday.xml

    <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"
    tools:context="com.thepsi.psidashboard.Fragments.HolidayFragment">

    <com.thepsi.psidashboard.CustomViews.CustomDatePicker
        android:id="@+id/customDatePicker_holiday"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:dateFormat="MONTH_YEAR"/>

    <android.support.v7.widget.RecyclerView
        android:id="@+id/recycle_view_holiday"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/general_margin_eight_dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/customDatePicker_holiday" />
</android.support.constraint.ConstraintLayout>

item_holiday.xml

item_holiday.xml

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

    <TextView
        android:id="@+id/textView25"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:text="24 - January - 2017"
        android:textColor="@color/colorPrimaryDark"
         />

    <TextView
        android:id="@+id/textView26"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginEnd="8dp"
        android:text="Saturday"
        android:layout_alignParentEnd="true"
        android:textColor="@color/colorPrimaryDark"
        />

    <TextView
        android:id="@+id/textView27"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:text="Mahavir Jayanti"
        android:textAlignment="center"
        android:textColor="@android:color/black"
        android:layout_below="@+id/textView25"
        />
</RelativeLayout>

预期设计-

有人可以告诉我我在这里想念的吗?

Can someone tell me what I am missing here?

推荐答案

尝试一下...

将 recyclerview 的宽度更改为 matchparent

是的！根据文档， ConstraintLayout 中的小工具不支持 matchparent 作为宽度.

Yeah! as per the documentation the widget in ConstraintLayout doesn't support matchparent as width.

我们必须将宽度分配为 0dp ，并使用 constraintStart_toStartOf ="parent" 和 constraintEnd_toEndOf ="parent" 反映您使用过的 matchparent .

We have to assign the width as 0dp and use constraintStart_toStartOf="parent" and constraintEnd_toEndOf="parent" to reflect matchparent like you used.

但是我提供的解决方案将在某些情况下适用于您.

But the solution I gave will work on some cases as you have.

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