AndroidX.ConstraintLayout:ConstraintLayout:2.1.0中的ImageView布局错误

Question

我使用Android Studio2020.3.1补丁3和ConstraintLayout来显示两行UI。

以下是预期的UI Latyout：

-------------------------------------------------------------------------
first_row_text_view  |   first_row_edit_text   |   first_row_image_view
-------------------------------------------------------------------------
second_row_text_view |   second_row_image_view |   second_row_switch
-------------------------------------------------------------------------

dependencies {
...
implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
...
}

<?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/first_row_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <EditText
        android:id="@+id/first_row_edit_text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintBaseline_toBaselineOf="@id/first_row_text_view"
        app:layout_constraintEnd_toStartOf="@id/first_row_image_view"
        app:layout_constraintStart_toEndOf="@id/barrier_left_right"
        app:layout_constraintTop_toTopOf="parent" />

    <ImageView
        android:id="@+id/first_row_image_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginHorizontal="16dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/first_row_edit_text"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/second_row_text_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/barrier_first_row" />

    <ImageView
        android:id="@+id/second_row_image_view"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintBaseline_toBaselineOf="@id/second_row_text_view"
        app:layout_constraintEnd_toStartOf="@id/second_row_switch"
        app:layout_constraintStart_toEndOf="@id/barrier_left_right"
        app:layout_constraintTop_toBottomOf="@id/barrier_first_row"/>

    <Switch
        android:id="@+id/second_row_switch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBaseline_toBaselineOf="@id/second_row_text_view"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toEndOf="@id/second_row_image_view"
        app:layout_constraintTop_toBottomOf="@id/barrier_first_row" />

    <androidx.constraintlayout.widget.Barrier
        android:id="@+id/barrier_left_right"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:barrierDirection="end"
        app:constraint_referenced_ids="first_row_text_view,second_row_text_view"
        tools:layout_editor_absoluteX="410dp"
        tools:layout_editor_absoluteY="1dp" />

    <androidx.constraintlayout.widget.Barrier
        android:id="@+id/barrier_first_row"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:barrierDirection="bottom"
        app:constraint_referenced_ids="first_row_text_view,first_row_edit_text,first_row_image_view" />

</androidx.constraintlayout.widget.ConstraintLayout>

<EditText
    android:id="@+id/second_row_image_view"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    app:layout_constraintBaseline_toBaselineOf="@id/second_row_text_view"
    app:layout_constraintEnd_toStartOf="@id/second_row_switch"
    app:layout_constraintStart_toEndOf="@id/barrier_left_right"
    app:layout_constraintTop_toBottomOf="@id/barrier_first_row"/>

您可以将test.xml复制到res/layout，在“code”视图中打开test.xml，然后单击“second_row_image_view”，最后切换到“design”视图，您还可以发现second_row_image_view浮动在first_row_edit_text的顶部。

Answer 1

这是因为app:layout_constraintbaseline_tobaselineof。基线是基于文本的视图的属性。ImageViews没有基线，而EditTexts有