应用错误收集

使用dimensionRatio子视图约束布局“wrap_content”

时间：2017-03-20 15:48:27

标签： android android-constraintlayout

在ConstraintLayout版本中＆lt; beta5，我的布局如下例所示：

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

但是，从beta5开始的版本已删除子视图的MATCH_PARENT约束。

该文档提供了使用app的示例：layout_constraintDimensionRatio：

如果两个尺寸都设置为MATCH_CONSTRAINT，您也可以使用比率（0dp）。在这种情况下，系统设置最大尺寸满足所有约束并保持指定的宽高比。至根据另一方的维度约束一个特定方。您可以预先附加W，“或H，以约束宽度或高度分别。例如，如果一个维度受两个约束您可以指示目标（例如，宽度为0dp并以父项为中心）应该约束哪一边，加上字母W（for 约束宽度）或H（用于约束高度）在前面比率，用逗号分隔：

<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="wrap_content">

    <ImageView
        android:id="@+id/square_image"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintDimensionRatio="H, 1:1"/>

</android.support.constraint.ConstraintLayout>

https://developer.android.com/reference/android/support/constraint/ConstraintLayout.html#DimensionConstraints

此示例在父布局具有固定高度或<Button android:layout_width="0dp" android:layout_height="0dp" app:layout_constraintDimensionRatio="H,16:9" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintTop_toTopOf="parent"/>时有效，但在父布局设置为match_parent时则无效。

使用上面的代码示例，如果我将ImageView宽度设置为0dp，则父视图会折叠，就好像它没有内容一样。

这是一个非常有用的功能，我觉得我只是在这个新版本中遗漏了一些东西。任何帮助表示赞赏。

1 个答案:

答案 0 :(得分：0)

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