当我想从这里实现 YouTube 之类的动作示例时，我遇到了一些错误。这是我的 XML 代码。
活动主.xml：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/layout_drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPrimary"
android:fitsSystemWindows="true"
android:layoutDirection="rtl"
tools:context=".presentation.activities.MainActivity">
<android.support.constraint.motion.MotionLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".presentation.activities.MainActivity">
<android.support.constraint.ConstraintLayout
android:id="@+id/top_image_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="?android:attr/windowBackground"
app:layout_constrainedWidth="true"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" >
<com.dastangram.app.presentation.components.Toolbar
android:id="@+id/toolbar"
app:layout_constraintTop_toTopOf="parent"
android:layout_width="match_parent"
android:layout_height="?actionBarSize" />
<FrameLayout
android:id="@+id/place_holder"
app:layout_constraintTop_toBottomOf="@id/toolbar"
app:layout_constraintBottom_toTopOf="@id/media_holder"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<FrameLayout
android:id="@+id/media_holder"
android:layout_width="match_parent"
android:layout_height="80dp"
app:layout_constraintBottom_toTopOf="@id/bottom_navigation"
android:background="@drawable/rect_radius_lower"
android:visibility="visible" />
<android.support.design.widget.BottomNavigationView
android:layout_gravity="bottom"
android:theme="@style/BottomNavigation"
android:id="@+id/bottom_navigation"
android:background="@color/colorPrimary"
app:itemIconTint="@drawable/bottom_nav_colors"
app:itemTextColor="@drawable/bottom_nav_colors"
app:menu="@menu/mnu_bottom_navigation"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</android.support.constraint.ConstraintLayout>
</android.support.constraint.motion.MotionLayout>
<android.support.design.widget.NavigationView
android:id="@+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="@color/colorPrimary"
android:fitsSystemWindows="true"
app:headerLayout="@layout/drawer_layout">
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
片段主：
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
android:background="@color/colorPrimary"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:background="@color/colorPrimary"
android:layoutDirection="rtl"
android:descendantFocusability="beforeDescendants"
android:focusableInTouchMode="true"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_margin="25dp"
android:padding="7dp"
android:imeOptions="flagNoExtractUi"
android:paddingStart="15dp"
android:textColor="@color/color_text_color"
android:background="@drawable/rect_radius"
android:textColorHint="@color/color_text_color"
android:hint="@string/str_search"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<ImageView
android:layout_gravity="end"
android:layout_marginTop="33dp"
android:layout_marginEnd="33dp"
android:tint="@color/color_text_color"
android:src="@drawable/ic_search"
android:layout_width="24dp"
android:layout_height="24dp"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/recycler_main"
android:layout_marginTop="100dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/color_text_color"/>
</FrameLayout>
</android.support.v4.widget.NestedScrollView>
片段媒体播放器.xml：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.motion.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:id="@+id/motionLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#444"
app:layoutDescription="@xml/scene_24"
tools:ignore="contentDescription">
<android.support.constraint.ConstraintLayout
android:id="@+id/constrains_media"
android:layoutDirection="ltr"
android:background="@color/colorPrimary"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/img_media_cover"
android:src="@drawable/ic_close_black"
android:layout_gravity="center_horizontal"
android:layout_width="200dp"
android:layout_height="200dp"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginStart="8dp"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginEnd="8dp"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.14999998"/>
<ImageView
android:src="@drawable/ic_fast_forward"
android:tint="@color/color_text_color"
android:layout_width="25dp"
android:layout_height="25dp"
android:id="@+id/img_fast_next"
app:layout_constraintStart_toEndOf="@+id/img_sec_forward"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintEnd_toEndOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.6"/>
<ImageView
android:src="@drawable/ic_forward_30_black"
android:tint="@color/color_text_color"
android:layout_width="25dp"
android:layout_height="25dp"
android:id="@+id/img_sec_forward"
app:layout_constraintStart_toEndOf="@+id/play_pause_view"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintEnd_toStartOf="@+id/img_fast_next"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.6"
app:layout_constraintBottom_toBottomOf="parent"/>
<com.ohoussein.playpause.PlayPauseView
android:id="@+id/play_pause_view"
android:clickable="true"
android:foreground="?android:selectableItemBackground"
app:fill_color="#e1e1e1"
app:pause_bg="@color/color_back_box"
app:play_bg="@color/color_text_color"
android:layout_width="40dp"
android:layout_height="40dp"
app:layout_constraintStart_toEndOf="@+id/img_sec_back"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintEnd_toStartOf="@+id/img_sec_forward"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.6"/>
<ImageView
android:src="@drawable/ic_replay_10_black"
android:tint="@color/color_text_color"
android:layout_width="25dp"
android:layout_height="25dp"
android:id="@+id/img_sec_back"
app:layout_constraintStart_toEndOf="@+id/img_fast_prev"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintEnd_toStartOf="@+id/play_pause_view"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintVertical_bias="0.6"/>
<ImageView
android:src="@drawable/ic_fast_rewind"
android:tint="@color/color_text_color"
android:layout_width="25dp"
android:layout_height="25dp"
android:id="@+id/img_fast_prev"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintEnd_toStartOf="@+id/img_sec_back"
android:layout_marginBottom="8dp"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.6"/>
<ImageView
android:layout_gravity="center"
android:tint="@color/color_text_color"
android:src="@drawable/ic_page"
android:layout_width="20dp"
android:layout_height="20dp"
android:id="@+id/img_media_desc"
android:layout_marginBottom="8dp"
app:layout_constraintVertical_bias="0.8"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginStart="8dp"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="parent"/>
<ProgressBar
android:id="@+id/pb_media"
android:layout_width="225dp"
android:layoutDirection="ltr"
android:layout_height="wrap_content"
style="@android:style/Widget.Holo.Light.ProgressBar.Horizontal"
android:layout_gravity="center"
android:progressTint="@color/color_text_color"
android:progressBackgroundTint="#4d34ff"
android:layout_marginStart="8dp"
app:layout_constraintStart_toStartOf="parent"
android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.5"
android:layout_marginBottom="8dp"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.85"/>
</android.support.constraint.ConstraintLayout>
</android.support.constraint.motion.MotionLayout>
场景_24.xml：
<?xml version="1.0" encoding="utf-8"?>
<!--
Copyright (C) 2018 The Android Open Source Project
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by motionlicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<MotionScene xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:motion="http://schemas.android.com/apk/res-auto">
<Transition
motion:constraintSetEnd="@id/end"
motion:constraintSetStart="@id/start"
motion:duration="1000"
motion:interpolator="linear">
<OnSwipe
motion:touchAnchorId="@+id/constrains_media"
motion:touchAnchorSide="bottom"
motion:dragDirection="dragUp" />
<ConstraintSet android:id="@id/start">
<Constraint
android:id="@id/constrains_media"
android:layout_width="0dp"
android:layout_height="320dp"
motion:layout_constraintTop_toTopOf="parent"
motion:layout_constraintStart_toStartOf="parent"
motion:layout_constraintEnd_toEndOf="parent" />
<Constraint
android:id="@id/img_media_cover"
android:layout_width="0dp"
android:layout_height="0dp"
motion:layout_constraintTop_toTopOf="@id/constrains_media"
motion:layout_constraintBottom_toBottomOf="@id/constrains_media"
motion:layout_constraintStart_toStartOf="@id/constrains_media"
motion:layout_constraintEnd_toEndOf="@id/constrains_media"
/>
<Constraint
android:id="@id/img_media_desc"
android:layout_width="0dp"
android:layout_height="0dp"
motion:layout_constraintTop_toBottomOf="@id/constrains_media"
motion:layout_constraintBottom_toBottomOf="parent"
motion:layout_constraintEnd_toEndOf="parent"
motion:layout_constraintStart_toStartOf="parent" />
<Constraint
android:id="@id/img_fast_next"
android:layout_width="0dp"
android:layout_height="0dp"
motion:layout_constraintTop_toBottomOf="@id/constrains_media"
motion:layout_constraintBottom_toBottomOf="parent"
motion:layout_constraintEnd_toEndOf="parent"
motion:layout_constraintStart_toStartOf="parent"/>
<Constraint android:id="@id/play_pause_view" >
<PropertySet motion:alpha="0" />
</Constraint>
<Constraint android:id="@id/img_fast_prev" >
<PropertySet motion:alpha="0" />
</Constraint>
<!--<Constraint
android:id="@id/bottom_nav"
android:layout_width="0dp"
android:layout_height="wrap_content"
motion:layout_constraintTop_toBottomOf="parent"
motion:layout_constraintLeft_toLeftOf="parent"
motion:layout_constraintRight_toRightOf="parent" />-->
</ConstraintSet>
<ConstraintSet android:id="@id/end">
<Constraint
android:id="@id/constrains_media"
android:layout_width="0dp"
android:layout_height="54dp"
android:layout_marginBottom="8dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
motion:layout_constraintEnd_toEndOf="parent"
motion:layout_constraintStart_toStartOf="parent"/>
<Constraint
android:id="@id/img_media_cover"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="2dp"
android:layout_marginBottom="2dp"
motion:layout_constraintTop_toTopOf="@id/constrains_media"
motion:layout_constraintBottom_toBottomOf="@id/constrains_media"
motion:layout_constraintStart_toStartOf="@id/constrains_media"
motion:layout_constraintDimensionRatio="H,1:2.5"
/>
<Constraint
android:id="@id/img_media_desc"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
motion:layout_constraintTop_toBottomOf="@id/constrains_media"
motion:layout_constraintEnd_toEndOf="parent"
motion:layout_constraintStart_toStartOf="parent" />
<Constraint
android:id="@id/img_fast_next"
android:layout_width="0dp"
android:layout_height="0dp"
android:alpha="0"
motion:layout_constraintTop_toBottomOf="@id/constrains_media"
motion:layout_constraintBottom_toBottomOf="@id/constrains_media"
motion:layout_constraintEnd_toEndOf="@id/constrains_media"
motion:layout_constraintStart_toStartOf="@id/constrains_media"
/>
<Constraint android:id="@id/play_pause_view" >
<PropertySet motion:alpha="1" />
</Constraint>
<Constraint android:id="@id/img_fast_prev" >
<PropertySet motion:alpha="1" />
</Constraint>
<!--<Constraint-->
<!--android:id="@id/bottom_nav"-->
<!--android:layout_width="0dp"-->
<!--android:layout_height="wrap_content"-->
<!--android:background="?android:attr/windowBackground"-->
<!--motion:layout_constraintBottom_toBottomOf="parent"-->
<!--motion:layout_constraintLeft_toLeftOf="parent"-->
<!--motion:layout_constraintRight_toRightOf="parent" />-->
</ConstraintSet>
<KeyFrameSet>
<KeyPosition
motion:target="@id/img_media_cover"
motion:framePosition="90"
motion:percentX="0"
motion:curveFit="linear"
/>
<KeyPosition
motion:target="@id/constrains_media"
motion:framePosition="90"
motion:curveFit="linear"
/>
<KeyPosition
motion:target="@id/img_media_desc"
motion:framePosition="90"
motion:curveFit="linear"
/>
<KeyAttribute
android:alpha="0"
motion:framePosition="75"
motion:target="@id/img_fast_next" />
<KeyAttribute
android:alpha="0.10"
motion:framePosition="90"
motion:target="@id/img_fast_prev" />
<KeyAttribute
android:alpha="0.10"
motion:framePosition="90"
motion:target="@id/play_pause_view" />
</KeyFrameSet>
</Transition>
</MotionScene>
在 activity_main.xml 我使用两个 frameLayout 来显示两个不同的片段。其中一个用于fragment_main.xml，另一个用于fragment_media_holder.xml。我想在向上滑动时喜欢“YouTube like motion Example”，我会看到所有媒体播放器部分，而在滑动底部时只看到 img_cover 和 playPauseView 和 ProgressBar。请帮我在我的代码中找到错误？！谢谢你