ConstraintLayout外部的位置视图 [英] Position view outside of ConstraintLayout

问题描述

我想将视图放置在 ConstraintLayout 之外，以使用滑动动画对其进行动画处理.我试过设置诸如 constraintBottom_toTopOf ="parent" 之类的约束，但是 View 保留在容器内.

I want to position views outside of a ConstraintLayout to animate them with a sliding animation. I've tried setting contraints like constraintBottom_toTopOf="parent" but the View stays inside the container.

请注意，我想通过使用内置动画而不是代码内动画的约束来实现这一目标.

Note that I want to achieve this with constraints to use built-in animations, not with in-code animations.

知道我该怎么做吗?

我正在使用 compile'c​​om.android.support.constraint:constraint-layout:1.1.0-beta1'与Android Studio 3.0 Beta 7

I'm using compile 'com.android.support.constraint:constraint-layout:1.1.0-beta1' with Android Studio 3.0 Beta 7

这是一个简单的xml文件，应将视图放置在容器之外:

This is a simple xml file that should place the view outside of the container :

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="@color/colorAccent">

    <View
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:background="@color/colorPrimary"
        app:layout_constraintBottom_toTopOf="parent"/>


</android.support.constraint.ConstraintLayout>

但这是结果

推荐答案

这似乎是 ConstraintLayout 1.1.0-beta1的问题；它可以在 ConstraintLayout 1.1.0-beta3中正常工作.

This appears to be an issue with ConstraintLayout 1.1.0-beta1; It works as expected in ConstraintLayout 1.1.0-beta3.

更新为 ConstraintLayout 1.1.0-beta3.我还将注意到，您需要通过执行以下操作来水平限制视图.

Update to ConstraintLayout 1.1.0-beta3. I will also note that you need to constrain your view horizontally by doing something like the following.

<View
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:background="@color/colorPrimary"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintBottom_toTopOf="parent" />

在旁注中， ConstraintLayout 中不接受负边距.请参阅此有关负边距和 ConstraintLayout .

On a side note, negative margins are not accepted in ConstraintLayout. See this Stack Overflow question regarding negative margins and ConstraintLayout.

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