如何在带约束的 MotionLayout 中创建幻灯片动画？

Question

运动布局：

<androidx.constraintlayout.motion.widget.MotionLayout 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"
tools:context=".MainActivity"
app:layoutDescription="@xml/activity_main_scene">


<FrameLayout
    android:id="@+id/left_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#0c0"
    >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:text="right text"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="left"
        android:text="left text"
        android:textColor="#33691E" />
</FrameLayout>

<FrameLayout
    android:id="@+id/bar"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:background="#c00"
    tools:ignore="SpeakableTextPresentCheck"
    tools:layout_editor_absoluteX="918dp">

    <View
        android:layout_width="50dp"
        android:layout_height="match_parent"
        android:clickable="false" />
</FrameLayout>

<FrameLayout
    android:id="@+id/right_content"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:background="#00c"
    >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#fff"
        android:layout_gravity="right"
        android:text="right text"
        />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#fff"
        android:layout_gravity="left"
        android:text="left text"
        />
</FrameLayout>

</androidx.constraintlayout.motion.widget.MotionLayout>

场景：

<MotionScene xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:motion="http://schemas.android.com/apk/res-auto"
>

<ConstraintSet android:id="@+id/start">

    <Constraint android:id="@id/left_content"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:visibility="visible"
        android:alpha="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@id/bar"
        />

    <Constraint android:id="@id/bar"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        app:layout_constraintRight_toRightOf="parent"
        />

    <Constraint android:id="@id/right_content"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toRightOf="@id/bar"
        app:layout_constraintRight_toRightOf="parent"/>

</ConstraintSet>

<ConstraintSet android:id="@+id/end">
    <Constraint android:id="@id/left_content"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:alpha="1"
        />

    <Constraint android:id="@id/bar"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toLeftOf="parent"
        />

    <Constraint android:id="@id/right_content"
        android:visibility="visible"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toRightOf="@id/bar"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />
</ConstraintSet>

<Transition
    app:constraintSetStart="@+id/start"
    app:constraintSetEnd="@id/end">
<!-- <OnClick app:targetId="@id/bar" app:clickAction="toggle" />-->
    <OnSwipe app:touchAnchorId="@id/bar" app:dragDirection="dragLeft" />
</Transition>
</MotionScene>

我需要像这样使用旧动画应用翻译动画：

<translate android:fromXDelta="0%"
               android:toXDelta="-100%"
               android:duration="150"
    />

当前的动画是一个dissapearing view的resize但是我需要平移动画，怎么实现？

Answer 1

终于解决了，至少说起来不容易：要在不调整内容大小的情况下实现幻灯片动画，您需要 2 个屏幕外布局，重新创建可想象的地方，可见内容将被推入或拉出。

第一个屏幕外缓冲区（位于可见布局的左侧）将镜像可见布局（不是完整副本，而是顶级容器的蓝图）。

第二个屏幕外缓冲区（位于可见布局的右侧）将是可见布局的副本。

重要提示：必须限制布局的不可见部分，因为它对用户可见，以避免将动画从 0 调整为目标大小

很难描述，但更容易显示结果：

<androidx.constraintlayout.motion.widget.MotionLayout 
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"
tools:context=".MainActivity"
app:layoutDescription="@xml/activity_main_scene">

<View
    android:id="@+id/off_screen_left"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />


<View
    android:id="@+id/off_screen_left_content"
    android:layout_width="0dp"
    android:layout_height="0dp"
    />

<FrameLayout
    android:id="@+id/off_screen_left_bar"
    android:layout_width="wrap_content"
    android:layout_height="match_parent">
    <View
        android:layout_width="50dp"
        android:layout_height="match_parent"
        />
</FrameLayout>

<View
    android:id="@+id/off_screen_right"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    />

<FrameLayout
    android:id="@+id/off_screen_right_bar"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    >
    <View android:layout_width="50dp"
          android:layout_height="match_parent"
        />
</FrameLayout>

<View android:id="@+id/off_screen_right_content"
    android:layout_width="0dp"
    android:layout_height="0dp"
    />

<FrameLayout
    android:id="@+id/left_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#0c0"
    >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right"
        android:text="right text"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="left"
        android:text="left text"
        android:textColor="#33691E" />
</FrameLayout>

<FrameLayout
    android:id="@+id/bar"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:background="#c00"
    tools:ignore="SpeakableTextPresentCheck">
    <View
        android:layout_width="50dp"
        android:layout_height="match_parent"
        />
</FrameLayout>

<FrameLayout
    android:id="@+id/right_content"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:background="#00c"
    >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#fff"
        android:layout_gravity="right"
        android:text="right text"
        />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#fff"
        android:layout_gravity="left"
        android:text="left text"
        />
</FrameLayout>
</androidx.constraintlayout.motion.widget.MotionLayout>

和场景：

<?xml version="1.0" encoding="utf-8"?>
<MotionScene 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:motion="http://schemas.android.com/apk/res-auto"
>

<ConstraintSet android:id="@+id/off_screens">
    <Constraint android:id="@id/off_screen_left"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        app:layout_constraintRight_toLeftOf="parent"
        app:layout_constraintWidth_default="percent"
        app:layout_constraintWidth_percent="1"
        />

    <Constraint android:id="@id/off_screen_left_bar"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toLeftOf="@id/off_screen_left"
        />

    <Constraint android:id="@id/off_screen_left_content"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toRightOf="@id/off_screen_left_bar"
        app:layout_constraintRight_toRightOf="@id/off_screen_left"
        />

    <Constraint android:id="@id/off_screen_right"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toRightOf="parent"
        app:layout_constraintWidth_default="percent"
        app:layout_constraintWidth_percent="1"
        />

    <Constraint android:id="@id/off_screen_right_bar"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        app:layout_constraintRight_toRightOf="@id/off_screen_right"
        />

    <Constraint android:id="@id/off_screen_right_content"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toLeftOf="@id/off_screen_right"
        app:layout_constraintRight_toLeftOf="@id/off_screen_right_bar"
        />
</ConstraintSet>


<ConstraintSet android:id="@+id/start"
    app:deriveConstraintsFrom="@id/off_screens">

    <Constraint android:id="@id/left_content"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@id/bar"
        />

    <Constraint android:id="@id/bar"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        app:layout_constraintRight_toRightOf="parent"
        />

    <Constraint android:id="@id/right_content"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toLeftOf="@id/off_screen_right_content"
        app:layout_constraintRight_toRightOf="@id/off_screen_right_content"/>

</ConstraintSet>

<ConstraintSet android:id="@+id/end" app:deriveConstraintsFrom="@id/off_screens">
    <Constraint android:id="@id/left_content"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toLeftOf="@id/off_screen_left_content"
        app:layout_constraintRight_toRightOf="@id/off_screen_left_content"
        />

    <Constraint android:id="@id/bar"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toLeftOf="parent"
        />

    <Constraint android:id="@id/right_content"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        app:layout_constraintLeft_toRightOf="@id/bar"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        />
</ConstraintSet>

<Transition
    app:constraintSetStart="@+id/start"
    app:constraintSetEnd="@id/end">
    <OnSwipe app:touchAnchorId="@id/bar" 
             app:dragDirection="dragLeft" />
    </Transition>
</MotionScene>

结果动画：

如何在带约束的 MotionLayout 中创建幻灯片动画？

How to create slide animation in MotionLayout with constraints?

android

android-animation

android-motionlayout