TransitionManager和ConstraintLayout，准则不起作用

Question

我正在尝试使用TransitionManager ConstraintLayout和Guideline从全屏显示到半屏显示>

这应该很简单。从约束到下层父级，再到50％准则。查看结果视频。它将高度降低到1dp。

我的第一个布局：

<?xml version="1.0" encoding="utf-8"?><!--
  ~ (c) Facebook, Inc. and its affiliates. Confidential and proprietary.
  -->

<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:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:ignore="BadClassUsageInResource-FrameLayout">

    <!-- foreground image -->
    <ImageView
        android:id="@+id/foreground_image"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:background="#ff0000"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>
我的第二个布局：

<?xml version="1.0" encoding="utf-8"?><!--
  ~ (c) Facebook, Inc. and its affiliates. Confidential and proprietary.
  -->

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <!-- foreground image -->
    <ImageView
        android:id="@+id/foreground_image"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_margin="50dp"
        android:background="#ff0000"
        app:layout_constraintBottom_toTopOf="@+id/middle_guideline"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/text"
        android:layout_width="200dp"
        android:layout_height="200dp"
        android:background="#9944FF"
        android:text="skdfjhskdjfhksjd"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/middle_guideline" />

    <android.support.constraint.Guideline
        android:id="@+id/middle_guideline"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.5" />

</android.support.constraint.ConstraintLayout>
单击时的过渡：

ConstraintSet constraintSet = new ConstraintSet();
constraintSet.clone(this, R.layout.second);
TransitionManager.beginDelayedTransition(mroot);
constraintSet.applyTo((ConstraintLayout) mroot);

我正在尝试使用TransitionManager ConstraintLayout和Guideline将全屏视图变成半屏视图，这应该很简单。从约束移到下层父级，再到50％...

Answer 1

请确保准则在两个布局文件中都具有相同的ID。准则应该是水平的，而不是垂直的。