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我有一个具有以下层次结构的布局

列表.xml

<android.support.constraint.ConstraintLayout
    android:id="@+id/layout_content"
    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.support.v4.widget.SwipeRefreshLayout
        android:id="@+id/refresh"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="@+id/layout_content"
        app:layout_constraintStart_toStartOf="@+id/layout_content"
        app:layout_constraintTop_toTopOf="@+id/layout_content"
        tools:layout_constraintEnd_creator="0"
        tools:layout_constraintStart_creator="0"
        tools:layout_editor_absoluteX="0dp">

        <com.fastaccess.cheaphlight.ui.widgets.recyclerview.DynamicRecyclerView
            android:id="@+id/recycler"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:padding="@dimen/spacing_large"
            app:layoutManager="@string/staggered_layout_manager"
            app:layout_constraintLeft_toLeftOf="@+id/refresh"
            app:spanCount="2"
            tools:listitem="@layout/county_row_item"/>

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

    <include
        layout="@layout/empty_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_constraintEnd_toEndOf="@+id/layout_content"
        app:layout_constraintStart_toStartOf="@+id/layout_content"
        app:layout_constraintTop_toTopOf="@+id/layout_content"
        tools:layout_constraintBottom_creator="0"
        tools:layout_constraintEnd_creator="0"
        tools:layout_constraintStart_creator="0"
        tools:layout_constraintTop_creator="0"/>

    <include
        layout="@layout/progress_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:paddingBottom="?attr/actionBarSize"
        app:layout_constraintBottom_toBottomOf="@+id/layout_content"
        app:layout_constraintEnd_toEndOf="@+id/layout_content"
        app:layout_constraintStart_toStartOf="@+id/layout_content"
        app:layout_constraintTop_toTopOf="@+id/layout_content"
        tools:layout_constraintBottom_creator="0"
        tools:layout_constraintEnd_creator="0"
        tools:layout_constraintStart_creator="0"
        tools:layout_constraintTop_creator="0"
        tools:layout_editor_absoluteX="205dp"
        tools:layout_editor_absoluteY="382dp"/>
</android.support.constraint.ConstraintLayout>

empty_layout.xml

    <android.support.constraint.ConstraintLayout
    android:id="@+id/empty_layout"
    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="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:visibility="gone"
    tools:visibility="visible">

    <ImageView
        android:id="@+id/image_message"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/ic_sad_face"
        app:layout_constraintBottom_toBottomOf="@+id/empty_layout"
        app:layout_constraintEnd_toEndOf="@+id/empty_layout"
        app:layout_constraintStart_toStartOf="@+id/empty_layout"
        app:layout_constraintTop_toTopOf="@+id/empty_layout"
        app:layout_constraintVertical_bias="0.19"
        tools:ignore="ContentDescription"
        tools:layout_constraintBottom_creator="0"
        tools:layout_constraintEnd_creator="0"
        tools:layout_constraintStart_creator="0"
        tools:layout_constraintTop_creator="0"
        tools:layout_editor_absoluteX="145dp"
        tools:layout_editor_absoluteY="321dp"/>

    <com.fastaccess.cheaphlight.ui.widgets.FontTextView
        android:id="@+id/text_message"
        style="@style/TextAppearance.AppCompat.Medium"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/image_message"
        android:layout_centerHorizontal="true"
        android:layout_margin="@dimen/spacing_normal"
        android:gravity="center_horizontal"
        android:padding="@dimen/spacing_s_large"
        android:textColor="@color/divider"
        app:layout_constraintEnd_toEndOf="@+id/empty_layout"
        app:layout_constraintStart_toStartOf="@+id/empty_layout"
        app:layout_constraintTop_toBottomOf="@+id/image_message"
        tools:layout_constraintEnd_creator="0"
        tools:layout_constraintStart_creator="0"
        tools:layout_constraintTop_creator="0"
        tools:layout_editor_absoluteX="205dp"
        tools:layout_editor_absoluteY="441dp"
        tools:text="Error Message"/>

    <com.fastaccess.cheaphlight.ui.widgets.FontButton
        android:id="@+id/reload_button"
        style="@style/Widget.AppCompat.Button.Borderless"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/text_message"
        android:layout_centerHorizontal="true"
        android:layout_margin="@dimen/spacing_normal"
        android:padding="@dimen/spacing_s_large"
        android:text="@string/reload"
        android:textColor="@color/accent"
        app:layout_constraintEnd_toEndOf="@+id/empty_layout"
        app:layout_constraintStart_toStartOf="@+id/empty_layout"
        app:layout_constraintTop_toBottomOf="@+id/text_message"
        tools:layout_constraintEnd_creator="0"
        tools:layout_constraintStart_creator="0"
        tools:layout_constraintTop_creator="0"
        tools:layout_editor_absoluteX="205dp"
        tools:layout_editor_absoluteY="441dp"/>
</android.support.constraint.ConstraintLayout>

progress_layout.xml

<ProgressBar
android:id="@+id/progress_layout"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:paddingBottom="?attr/actionBarSize"
android:visibility="gone"
tools:visibility="visible"/>

在我的 Fragment 类中，我隐藏 SwipeRefreshLayout 及其子 RecyclerView 并显示 empty_layout。这很好用，但是如果我关闭和打开设备屏幕，empty_layout 就会消失。

仅供参考：我已将嵌套 ConstrainLayout 的可见性设置为始终可见，但如果我关闭/打开屏幕，它就会消失。

仅供参考：如果我曾经显示 ProgressView，则 ProgressView 在屏幕上保持可见开/关我假设它是因为 ProgressView 没有包裹在嵌套的 ConstraintLayout 下！？。

关于为什么嵌套的 ConstrainLayout 仅在屏幕开/关时消失，而在我旋转屏幕时它仍然存在的任何想法？

4

1 回答 1

0

嗯，奇怪，我将 empty_layout.xml 包裹在下面FrameLayout，一切正常。Layout变成如下：

<FrameLayout
    android:id="@+id/empty_layout"
    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="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:visibility="gone"
    tools:visibility="visible">

    <android.support.constraint.ConstraintLayout
        android:id="@+id/holder"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center">

        <ImageView
            android:id="@+id/image_message"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_sad_face"
            app:layout_constraintBottom_toBottomOf="@+id/holder"
            app:layout_constraintEnd_toEndOf="@+id/holder"
            app:layout_constraintStart_toStartOf="@+id/holder"
            app:layout_constraintTop_toTopOf="@+id/holder"
            app:layout_constraintVertical_bias="0.19"
            tools:ignore="ContentDescription"
            tools:layout_constraintBottom_creator="0"
            tools:layout_constraintEnd_creator="0"
            tools:layout_constraintStart_creator="0"
            tools:layout_constraintTop_creator="0"
            tools:layout_editor_absoluteX="145dp"
            tools:layout_editor_absoluteY="321dp"/>

        <com.fastaccess.cheaphlight.ui.widgets.FontTextView
            android:id="@+id/text_message"
            style="@style/TextAppearance.AppCompat.Medium"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/image_message"
            android:layout_centerHorizontal="true"
            android:layout_margin="@dimen/spacing_normal"
            android:gravity="center_horizontal"
            android:padding="@dimen/spacing_s_large"
            android:textColor="@color/divider"
            app:layout_constraintEnd_toEndOf="@+id/holder"
            app:layout_constraintStart_toStartOf="@+id/holder"
            app:layout_constraintTop_toBottomOf="@+id/image_message"
            tools:layout_constraintEnd_creator="0"
            tools:layout_constraintStart_creator="0"
            tools:layout_constraintTop_creator="0"
            tools:layout_editor_absoluteX="205dp"
            tools:layout_editor_absoluteY="441dp"
            tools:text="Error Message"/>

        <com.fastaccess.cheaphlight.ui.widgets.FontButton
            android:id="@+id/reload_button"
            style="@style/Widget.AppCompat.Button.Borderless"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/text_message"
            android:layout_centerHorizontal="true"
            android:layout_margin="@dimen/spacing_normal"
            android:padding="@dimen/spacing_s_large"
            android:text="@string/reload"
            android:textColor="@color/accent"
            app:layout_constraintEnd_toEndOf="@+id/holder"
            app:layout_constraintStart_toStartOf="@+id/holder"
            app:layout_constraintTop_toBottomOf="@+id/text_message"
            tools:layout_constraintEnd_creator="0"
            tools:layout_constraintStart_creator="0"
            tools:layout_constraintTop_creator="0"
            tools:layout_editor_absoluteX="205dp"
            tools:layout_editor_absoluteY="441dp"/>
    </android.support.constraint.ConstraintLayout>
</FrameLayout>

但是，这并不能回答我关于为什么Nested ConstraintLayout屏幕转动OFF和ON返回时消失的问题，如果有人能启发我，我将不胜感激。

于 2016-05-29T12:53:54.637 回答