Android中协调滚动布局的实现代码

目录

• 使用 AppbarLayout 和 MotionLayout 实现常用的布局效果
• 一、AppbarLayout + ViewPager
• 二、AppbarLayout + RecyclerView
• 三、MotionLayout
• 总结

使用 AppbarLayout 和 MotionLayout 实现常用的布局效果

前文我们讲了协调滚动的一些定义方式，我们在开发中常用的几种效果都可用 AppbarLayout 或 MotionLayout 来实现。

这里先上效果图

可能大家都比较会AppbarLayout这种实现方式，这里就直接上代码和效果图了。

一、AppbarLayout + ViewPager

核心代码都在 CoordinatorLayout 闭包中

        <androidx.coordinatorlayout.widget.CoordinatorLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">
                <com.google.android.material.appbar.AppBarLayout
                    android:id="@+id/app_bar_layout"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/white"
                    android:orientation="vertical"
                    app:elevation="0dp">
                    <!--   顶部的图片    -->
                    <androidx.constraintlayout.widget.ConstraintLayout
                        android:id="@+id/cl_img_box"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        app:layout_scrollFlags="scroll|snap">
                        <ImageView
                            android:id="@+id/image_view_photo_cover"
                            android:layout_width="0dp"
                            android:layout_height="0dp"
                            android:contentDescription="@string/part_time_jobs"
                            android:scaleType="centerCrop"
                            app:layout_constraintDimensionRatio="W,94:129"
                            app:layout_constraintLeft_toLeftOf="parent"
                            app:layout_constraintRight_toRightOf="parent"
                            app:layout_constraintTop_toTopOf="parent" />
                        <ProgressBar
                            android:id="@+id/progress_bar_job_detail"
                            android:layout_width="25dp"
                            android:layout_height="25dp"
                            android:layout_gravity="center"
                            android:indeterminate="true"
                            android:indeterminateTint="@color/colorAccent"
                            android:indeterminateTintMode="src_atop"
                            app:layout_constraintBottom_toBottomOf="parent"
                            app:layout_constraintLeft_toLeftOf="parent"
                            app:layout_constraintRight_toRightOf="parent"
                            app:layout_constraintTop_toTopOf="parent" />
                        <com.youth.banner.Banner
                            android:id="@+id/banner_employer_imgs"
                            android:layout_width="match_parent"
                            android:layout_height="0dp"
                            android:background="@drawable/iv_promotion_merchant_detail_placehold_bg"
                            app:banner_auto_loop="false"
                            app:banner_indicator_height="@dimen/d_5dp"
                            app:banner_indicator_marginBottom="@dimen/d_15dp"
                            app:banner_indicator_normal_color="#66ffffff"
                            app:banner_indicator_normal_width="@dimen/d_4dp"
                            app:banner_indicator_selected_color="#ffffff"
                            app:banner_indicator_selected_width="@dimen/d_6dp"
                            app:banner_indicator_space="@dimen/d_4dp"
                            app:banner_infinite_loop="true"
                            app:layout_constraintDimensionRatio="W,94:129"
                            app:layout_constraintLeft_toLeftOf="parent"
                            app:layout_constraintRight_toRightOf="parent"
                            app:layout_constraintTop_toTopOf="parent" />
                        <LinearLayout
                            android:id="@+id/ll_gallery_box"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginRight="@dimen/d_15dp"
                            android:layout_marginBottom="@dimen/d_10dp"
                            android:background="@drawable/shape_job_detail_gallery_box"
                            android:gravity="center"
                            android:orientation="horizontal"
                            app:layout_constraintBottom_toBottomOf="parent"
                            app:layout_constraintRight_toRightOf="parent">
                            <TextView
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:drawableLeft="@drawable/job_detail_gallery_icon"
                                android:drawablePadding="@dimen/d_7dp"
                                android:paddingLeft="@dimen/d_10dp"
                                android:paddingTop="@dimen/d_6dp"
                                android:paddingRight="@dimen/d_10dp"
                                android:paddingBottom="@dimen/d_6dp"
                                android:text="@string/gallery"
                                android:textColor="@color/white"
                                android:textSize="@dimen/d_14sp" />
                        </LinearLayout>
                    </androidx.constraintlayout.widget.ConstraintLayout>
                    <!--   Tab布局         -->
                    <FrameLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">
                        <com.google.android.material.tabs.TabLayout
                            android:id="@+id/tabLayout"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:background="@color/white"
                            app:tabIndicator="@drawable/shape_blue_bottom_line_3conner"
                            app:tabIndicatorColor="@color/app_blue"
                            app:tabIndicatorFullWidth="false"
                            app:tabIndicatorHeight="@dimen/d_2dp"
                            app:tabMode="scrollable"
                            app:tabRippleColor="@color/transparent"
                            app:tabSelectedTextColor="@color/app_blue"
                            app:tabTextColor="@color/black" />
                        <ImageView
                            android:id="@+id/iv_tab_right"
                            android:layout_width="wrap_content"
                            android:layout_height="match_parent"
                            android:layout_gravity="right"
                            android:src="@drawable/job_detail_tab_right_arrow" />
                    </FrameLayout>
                    <View
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/d_6dp"
                        android:background="@color/page_background" />
                </com.google.android.material.appbar.AppBarLayout>
                <androidx.viewpager.widget.ViewPager
                    android:id="@+id/view_pager"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    app:layout_behavior="@string/appbar_scrolling_view_behavior" />
            </androidx.coordinatorlayout.widget.CoordinatorLayout>

很平常的效果了，也是用的比较多的效果，定义起来非常简单，在AppbarLayout下面包裹2个View，图片View跟随滚动，而TabBarLayout则吸顶。

效果如下：

二、AppbarLayout + RecyclerView

和上面一样的效果，这里我们可以指定下拉的时候把隐藏的布局显示出来，设置一个核心属性

app:layout_scrollFlags="scroll|snap|enterAlways

定义的布局如下：

        <androidx.coordinatorlayout.widget.CoordinatorLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <!--    顶部的筛选     -->
            <com.google.android.material.appbar.AppBarLayout
                android:id="@+id/app_bar_layout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/white">
                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:background="@color/white"
                    android:orientation="vertical"
                    app:layout_scrollFlags="scroll|snap|enterAlways">
                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginLeft="@dimen/d_12dp"
                        android:layout_marginTop="@dimen/d_12dp"
                        android:layout_marginRight="@dimen/d_12dp"
                        android:gravity="center_vertical"
                        android:orientation="horizontal">
                        <TextView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:text="兼职推荐"
                            android:textColor="@color/black_33"
                            android:textSize="@{viewModel.mSortTypeLD == 1?@dimen/d_17sp:@dimen/d_15sp}"
                            binding:clicks="@{click.switchReCommend}"
                            binding:typefaceMediumOrBold="@{viewModel.mSortTypeLD == 1}"
                            tools:textSize="@dimen/d_17sp" />
                        <TextView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginLeft="@dimen/d_15dp"
                            android:text="最新"
                            android:textColor="@color/black_33"
                            android:textSize="@{viewModel.mSortTypeLD == 2?@dimen/d_17sp:@dimen/d_15sp}"
                            binding:clicks="@{click.switchlatested}"
                            binding:typefaceMediumOrBold="@{viewModel.mSortTypeLD == 2}" />
                        <TextView
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_marginLeft="@dimen/d_15dp"
                            android:text="附近"
                            android:textColor="@color/black_33"
                            android:textSize="@{viewModel.mSortTypeLD == 3?@dimen/d_17sp:@dimen/d_15sp}"
                            binding:clicks="@{click.switchNearby}"
                            binding:typefaceMediumOrBold="@{viewModel.mSortTypeLD == 3}" />
                    </LinearLayout>
                    <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="@dimen/d_8dp"
                        android:orientation="horizontal"
                        android:paddingLeft="@dimen/d_15dp"
                        android:paddingRight="@dimen/d_15dp">
                        <TextView
                            android:layout_width="0dp"
                            android:layout_height="@dimen/d_27dp"
                            android:layout_weight="1"
                            android:background="@{viewModel.MPopupPositionTypeLD==1?@drawable/shape_blue_round2_border:@drawable/shape_white_gray_round2}"
                            android:drawableRight="@{viewModel.MPopupPositionTypeLD==1?@drawable/ic_drop_up_blue:@drawable/ic_drop_down_gray}"
                            android:gravity="center"
                            android:paddingLeft="@dimen/d_8dp"
                            android:paddingRight="@dimen/d_8dp"
                            android:text="全武汉"
                            android:textColor="@{viewModel.MPopupPositionTypeLD==1?@color/app_blue:@color/gray_66}"
                            android:textSize="@dimen/d_12sp"
                            binding:clicks="@{click.searchByLocationPopup}"
                            tools:drawableRight="@drawable/ic_drop_down_gray" />
                        <TextView
                            android:layout_width="0dp"
                            android:layout_height="@dimen/d_27dp"
                            android:layout_marginLeft="@dimen/d_5dp"
                            android:layout_weight="1"
                            android:background="@{viewModel.MPopupPositionTypeLD==2?@drawable/shape_blue_round2_border:@drawable/shape_white_gray_round2}"
                            android:drawableRight="@{viewModel.MPopupPositionTypeLD==2?@drawable/ic_drop_up_blue:@drawable/ic_drop_down_gray}"
                            android:gravity="center"
                            android:paddingLeft="@dimen/d_8dp"
                            android:paddingRight="@dimen/d_8dp"
                            android:text="职位类型"
                            android:textColor="@{viewModel.MPopupPositionTypeLD==2?@color/app_blue:@color/gray_66}"
                            android:textSize="@dimen/d_12sp"
                            binding:clicks="@{click.searchByPositionPopup}"
                            tools:drawableRight="@drawable/ic_drop_down_gray" />
                        <TextView
                            android:layout_width="0dp"
                            android:layout_height="@dimen/d_27dp"
                            android:layout_marginLeft="@dimen/d_5dp"
                            android:layout_weight="1"
                            android:background="@{viewModel.MPopupPositionTypeLD==3?@drawable/shape_blue_round2_border:@drawable/shape_white_gray_round2}"
                            android:drawableRight="@{viewModel.MPopupPositionTypeLD==3?@drawable/ic_drop_up_blue:@drawable/ic_drop_down_gray}"
                            android:gravity="center"
                            android:paddingLeft="@dimen/d_8dp"
                            android:paddingRight="@dimen/d_8dp"
                            android:text="日期"
                            android:textColor="@{viewModel.MPopupPositionTypeLD==3?@color/app_blue:@color/gray_66}"
                            android:textSize="@dimen/d_12sp"
                            binding:clicks="@{click.searchByDatePopup}"
                            tools:drawableRight="@drawable/ic_drop_down_gray" />
                        <TextView
                            android:layout_width="0dp"
                            android:layout_height="@dimen/d_27dp"
                            android:layout_marginLeft="@dimen/d_5dp"
                            android:layout_weight="1"
                            android:background="@{viewModel.MPopupPositionTypeLD==4?@drawable/shape_blue_round2_border:@drawable/shape_white_gray_round2}"
                            android:drawableRight="@{viewModel.MPopupPositionTypeLD==4?@drawable/ic_drop_up_blue:@drawable/ic_drop_down_gray}"
                            android:gravity="center"
                            android:paddingLeft="@dimen/d_8dp"
                            android:paddingRight="@dimen/d_8dp"
                            android:text="筛选"
                            android:textColor="@{viewModel.MPopupPositionTypeLD==4?@color/app_blue:@color/gray_66}"
                            android:textSize="@dimen/d_12sp"
                            binding:clicks="@{click.searchByFilterPopup}"
                            tools:drawableRight="@drawable/ic_drop_down_gray" />
                    </LinearLayout>
                    <View
                        android:id="@+id/view_popup_divider"
                        android:layout_width="match_parent"
                        android:layout_height="@dimen/d_1dp"
                        android:layout_marginTop="@dimen/d_10dp"
                        android:background="@color/main_divider" />
                </LinearLayout>
            </com.google.android.material.appbar.AppBarLayout>
            <!--   刷新+列表   -->
            <com.scwang.smart.refresh.layout.SmartRefreshLayout
                android:id="@+id/refresh_layout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:focusable="true"
                android:focusableInTouchMode="true"
                app:layout_behavior="@string/appbar_scrolling_view_behavior"
                app:srlEnablePreviewInEditMode="true"
                app:srlPrimaryColor="@color/white"
                tools:visibility="gone">
                <com.scwang.smart.refresh.header.ClassicsHeader
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content" />
                <androidx.recyclerview.widget.RecyclerView
                    android:id="@+id/recycler_view"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:overScrollMode="never"
                    android:scrollbars="vertical">
                </androidx.recyclerview.widget.RecyclerView>
            </com.scwang.smart.refresh.layout.SmartRefreshLayout>
        </androidx.coordinatorlayout.widget.CoordinatorLayout>

效果如下：

三、MotionLayout

MotionLayout的定义主要看xml中控件的start end 的位置与状态。

页面xml：

  <androidx.constraintlayout.motion.widget.MotionLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            app:layoutDescription="@xml/scene_part_job_detail">
            <!--   顶部的图片    -->
            <androidx.constraintlayout.widget.ConstraintLayout
                android:id="@+id/cl_top_img_box"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <ImageView
                    android:id="@+id/iv_job_image"
                    android:layout_width="0dp"
                    android:layout_height="0dp"
                    android:background="@color/gray"
                    android:scaleType="centerCrop"
                    app:layout_constraintDimensionRatio="W,219:375"
                    app:layout_constraintLeft_toLeftOf="parent"
                    app:layout_constraintRight_toRightOf="parent"
                    app:layout_constraintTop_toTopOf="parent" />
            </androidx.constraintlayout.widget.ConstraintLayout>
            <!-- 相册布局 -->
            <LinearLayout
                android:id="@+id/ll_gallery_box"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginRight="@dimen/d_15dp"
                android:layout_marginBottom="@dimen/d_10dp"
                android:background="@drawable/shape_job_detail_gallery_box"
                android:gravity="center"
                android:orientation="horizontal"
                app:layout_constraintBottom_toBottomOf="@id/cl_top_img_box"
                app:layout_constraintRight_toRightOf="@id/cl_top_img_box"
                binding:clicks="@{click.gotoGalleryPage}">
                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:drawableLeft="@drawable/job_detail_gallery_icon"
                    android:drawablePadding="@dimen/d_7dp"
                    android:paddingLeft="@dimen/d_10dp"
                    android:paddingTop="@dimen/d_6dp"
                    android:paddingRight="@dimen/d_10dp"
                    android:paddingBottom="@dimen/d_6dp"
                    android:text="相册"
                    android:textColor="@color/white"
                    android:textSize="@dimen/d_14sp" />
            </LinearLayout>
            <!--   固定的状态栏 用于定位     -->
            <com.guadou.lib_baselib.view.titlebar.StatusbarGrayView
                android:id="@+id/status_view"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" />
            <!--   返回栏    -->
            <FrameLayout
                android:id="@+id/back_layout"
                android:layout_width="match_parent"
                android:layout_height="@dimen/d_40dp"
                android:background="@color/transparent"
                tools:layout_editor_absoluteY="24dp">
                <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical"
                    android:layout_marginLeft="@dimen/d_14dp"
                    android:layout_marginTop="@dimen/d_2dp"
                    android:src="@mipmap/back_white_icon" />
                <ImageView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical|right"
                    android:layout_marginRight="@dimen/d_15dp"
                    android:src="@drawable/part_detail_job_collect_icon" />
            </FrameLayout>
            <!--  工作信息等TextView    -->
            <TextView
                android:id="@+id/tv_job_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="@dimen/d_15dp"
                android:layout_marginTop="@dimen/d_5dp"
                android:ellipsize="end"
                android:gravity="center"
                android:lines="1"
                android:singleLine="true"
                android:text="斗鱼主播招聘"
                android:textColor="@color/white"
                android:textSize="@dimen/d_20sp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@id/back_layout" />
            <TextView
                android:id="@+id/tv_job_employer"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="@dimen/d_15dp"
                android:layout_marginTop="@dimen/d_10dp"
                android:text="武汉斗鱼网络科技有限公司"
                android:textColor="@color/white"
                android:textSize="@dimen/d_14sp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tv_job_title" />
            <TextView
                android:id="@+id/tv_job_hour"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="@dimen/d_15dp"
                android:layout_marginTop="@dimen/d_10dp"
                android:text="100元/小时"
                android:textColor="@color/text_orange"
                android:textSize="@dimen/d_16sp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tv_job_employer" />
            <TextView
                android:id="@+id/tv_job_industry"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="@dimen/d_15dp"
                android:layout_marginTop="@dimen/d_8dp"
                android:text="江岸 | 主播"
                android:textColor="@color/white"
                android:textSize="@dimen/d_14sp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@id/tv_job_hour" />
            <!--   Tab布局     -->
            <FrameLayout
                android:id="@+id/tab_layout_box"
                android:layout_width="match_parent"
                android:layout_height="@dimen/d_40dp">
                <com.google.android.material.tabs.TabLayout
                    android:id="@+id/tabLayout"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/d_40dp"
                    android:background="@color/white"
                    app:tabIndicator="@drawable/shape_blue_bottom_line_3conner"
                    app:tabIndicatorColor="@color/app_blue"
                    app:tabIndicatorFullWidth="false"
                    app:tabIndicatorHeight="@dimen/d_2dp"
                    app:tabMode="scrollable"
                    app:tabRippleColor="@color/transparent"
                    app:tabSelectedTextColor="@color/app_blue"
                    app:tabTextColor="@color/black" />
                <ImageView
                    android:id="@+id/iv_tab_right"
                    android:layout_width="wrap_content"
                    android:layout_height="match_parent"
                    android:layout_gravity="right"
                    android:src="@drawable/job_detail_tab_right_arrow"
                    binding:clicks="@{click.tabNext}" />
            </FrameLayout>
            <!--   Fragment容器     -->
            <androidx.viewpager.widget.ViewPager
                android:id="@+id/view_pager"
                android:layout_width="match_parent"
                android:layout_height="0dp" />
        </androidx.constraintlayout.motion.widget.MotionLayout>

定义场景xml : 控件多的话，定义的东西也会比较多

<?xml version="1.0" encoding="utf-8"?>
<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="350">
        <OnClick
            motion:clickAction="toggle"
            motion:targetId="@id/cl_top_img_box" />
        <OnSwipe
            motion:dragDirection="dragUp"
            motion:touchAnchorId="@id/view_pager" />
    </Transition>
    <ConstraintSet android:id="@+id/start">
        <Constraint
            android:id="@id/cl_top_img_box"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/ll_gallery_box"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="@dimen/d_15dp"
            android:layout_marginBottom="@dimen/d_10dp"
            android:alpha="1"
            motion:layout_constraintBottom_toBottomOf="@id/cl_top_img_box"
            motion:layout_constraintRight_toRightOf="@id/cl_top_img_box" />
        <Constraint
            android:id="@id/status_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:alpha="0"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/back_layout"
            android:layout_width="match_parent"
            android:layout_height="@dimen/d_40dp"
            motion:layout_constraintTop_toBottomOf="@id/status_view" />
        <Constraint
            android:id="@id/tv_job_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/d_15dp"
            android:layout_marginTop="@dimen/d_5dp"
            android:layout_marginRight="@dimen/d_15dp"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/back_layout">
            <CustomAttribute
                motion:attributeName="textSize"
                motion:customFloatValue="20" />
        </Constraint>
        <Constraint
            android:id="@id/tv_job_employer"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/d_15dp"
            android:layout_marginTop="@dimen/d_10dp"
            android:alpha="1"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/tv_job_title" />
        <Constraint
            android:id="@id/tv_job_hour"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/d_15dp"
            android:layout_marginTop="@dimen/d_10dp"
            android:alpha="1"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/tv_job_employer" />
        <Constraint
            android:id="@id/tv_job_industry"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/d_15dp"
            android:layout_marginTop="@dimen/d_8dp"
            android:alpha="1"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/tv_job_hour" />
        <Constraint
            android:id="@id/tab_layout_box"
            android:layout_width="match_parent"
            android:layout_height="@dimen/d_40dp"
            motion:layout_constraintTop_toBottomOf="@id/cl_top_img_box" />
        <Constraint
            android:id="@id/view_pager"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            motion:layout_constraintBottom_toBottomOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/tab_layout_box" />
    </ConstraintSet>
    <ConstraintSet android:id="@+id/end">
        <Constraint
            android:id="@id/cl_top_img_box"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            motion:layout_constraintBottom_toBottomOf="@id/back_layout"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/ll_gallery_box"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="@dimen/d_15dp"
            android:layout_marginBottom="@dimen/d_10dp"
            android:alpha="0"
            motion:layout_constraintBottom_toBottomOf="@id/cl_top_img_box"
            motion:layout_constraintRight_toRightOf="@id/cl_top_img_box" />
        <Constraint
            android:id="@id/status_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:alpha="0"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/back_layout"
            android:layout_width="match_parent"
            android:layout_height="@dimen/d_40dp"
            motion:layout_constraintTop_toBottomOf="@id/status_view" />
        <Constraint
            android:id="@id/tv_job_title"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/d_50dp"
            android:layout_marginTop="0dp"
            android:layout_marginRight="@dimen/d_50dp"
            motion:layout_constraintBottom_toBottomOf="@id/back_layout"
            motion:layout_constraintLeft_toLeftOf="@id/back_layout"
            motion:layout_constraintRight_toRightOf="@id/back_layout"
            motion:layout_constraintTop_toTopOf="@id/back_layout">
            <CustomAttribute
                motion:attributeName="textSize"
                motion:customFloatValue="20" />
        </Constraint>
        <Constraint
            android:id="@id/tv_job_employer"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/d_15dp"
            android:layout_marginTop="@dimen/d_11dp"
            android:alpha="0"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/back_layout" />
        <Constraint
            android:id="@id/tv_job_hour"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/d_15dp"
            android:layout_marginTop="@dimen/d_11dp"
            android:alpha="0"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/tv_job_employer" />
        <Constraint
            android:id="@id/tv_job_industry"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/d_15dp"
            android:layout_marginTop="@dimen/d_8dp"
            android:alpha="0"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/tv_job_hour" />
        <Constraint
            android:id="@id/tab_layout_box"
            android:layout_width="match_parent"
            android:layout_height="@dimen/d_40dp"
            motion:layout_constraintTop_toBottomOf="@id/back_layout" />
        <Constraint
            android:id="@id/view_pager"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            motion:layout_constraintBottom_toBottomOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/tab_layout_box" />
    </ConstraintSet>
</MotionScene>

效果：

同样的效果我们可以用 MotionLayout 实现一些 Behavior 的效果：

   <androidx.constraintlayout.motion.widget.MotionLayout
        android:id="@+id/motion_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/page_bg"
        app:layoutDescription="@xml/scene_profile_page">
        <!--   状态栏   -->
        <com.guadou.lib_baselib.view.titlebar.StatusbarGrayView
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <!--  Profile顶部    -->
        <ImageView
            android:id="@+id/iv_top_bg"
            android:layout_width="0dp"
            android:layout_height="245dp"
            android:scaleType="fitXY"
            android:src="@drawable/profile_top_img_bg"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />
        <!--    内部的头像+姓名等信息    -->
        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/cl_name_info"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="30dp"
            android:layout_marginTop="50dp"
            android:layout_marginRight="15dp"
            android:orientation="horizontal"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent">
            <com.guadou.lib_baselib.view.CircleImageView
                android:id="@+id/iv_user_avatar"
                android:layout_width="74dp"
                android:layout_height="74dp"
                android:src="@color/gray"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toTopOf="parent" />
            <TextView
                android:id="@+id/iv_user_name"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginLeft="@dimen/d_10dp"
                android:text="邓悠然"
                android:textColor="@color/black_33"
                android:textSize="@dimen/d_20sp"
                app:layout_constraintBottom_toTopOf="@id/tv_user_mobile"
                app:layout_constraintLeft_toRightOf="@id/iv_user_avatar"
                app:layout_constraintRight_toLeftOf="@id/tv_user_resume"
                app:layout_constraintTop_toTopOf="@id/iv_user_avatar" />
            <TextView
                android:id="@+id/tv_user_mobile"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/shape_profile_mobile_bg"
                android:drawableLeft="@drawable/profile_mobile_icon"
                android:drawablePadding="4.5dp"
                android:paddingLeft="@dimen/d_10dp"
                android:paddingTop="@dimen/d_5dp"
                android:paddingRight="@dimen/d_10dp"
                android:paddingBottom="@dimen/d_5dp"
                android:text="18961023119"
                android:textColor="@color/black_33"
                android:textSize="@dimen/d_14sp"
                app:layout_constraintBottom_toBottomOf="@id/iv_user_avatar"
                app:layout_constraintLeft_toLeftOf="@id/iv_user_name"
                app:layout_constraintTop_toBottomOf="@id/iv_user_name" />
            <TextView
                android:id="@+id/tv_user_resume"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/shape_profile_resume_bg"
                android:drawableLeft="@drawable/profile_resume_icon"
                android:drawablePadding="@dimen/d_7dp"
                android:paddingLeft="@dimen/d_15dp"
                android:paddingTop="@dimen/d_8dp"
                android:paddingRight="@dimen/d_13dp"
                android:paddingBottom="@dimen/d_8dp"
                android:text="我的简历"
                android:textColor="@color/black_33"
                android:textSize="@dimen/d_14sp"
                app:layout_constraintBottom_toBottomOf="@id/iv_user_avatar"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="@id/iv_user_avatar"
                binding:clicks="@{click.gotoMyResume}" />
        </androidx.constraintlayout.widget.ConstraintLayout>
        <!--    内部的工作申请统计相关     -->
        <LinearLayout
            android:id="@+id/ll_job_info"
            android:layout_width="match_parent"
            android:layout_height="117dp"
            android:layout_marginLeft="@dimen/d_15dp"
            android:layout_marginTop="180dp"
            android:layout_marginRight="@dimen/d_15dp"
            android:background="@drawable/shape_white_round10"
            android:orientation="vertical">
            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="@dimen/d_20dp"
                android:layout_marginTop="14.5dp"
                android:text="我的投递"
                android:textColor="@color/black_33"
                android:textSize="@dimen/d_16sp" />
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal"
                android:paddingLeft="@dimen/d_5dp"
                android:paddingRight="@dimen/d_5dp">
                <androidx.constraintlayout.widget.ConstraintLayout
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:background="@drawable/selector_btn_white_gray_bg"
                    binding:clicks="@{click.gotoJobAll}">
                   ...
                </androidx.constraintlayout.widget.ConstraintLayout>
                <androidx.constraintlayout.widget.ConstraintLayout
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:background="@drawable/selector_btn_white_gray_bg"
                    binding:clicks="@{click.gotoJobPending}">
                   ...
                </androidx.constraintlayout.widget.ConstraintLayout>
                <androidx.constraintlayout.widget.ConstraintLayout
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:background="@drawable/selector_btn_white_gray_bg"
                    binding:clicks="@{click.gotoJobApplied}">
                    ...
                </androidx.constraintlayout.widget.ConstraintLayout>
                <androidx.constraintlayout.widget.ConstraintLayout
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:background="@drawable/selector_btn_white_gray_bg"
                    binding:clicks="@{click.gotoJobArrived}">
                   ...
                </androidx.constraintlayout.widget.ConstraintLayout>
                <androidx.constraintlayout.widget.ConstraintLayout
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:background="@drawable/selector_btn_white_gray_bg"
                    binding:clicks="@{click.gotoJobComplete}">
                    ...
                </androidx.constraintlayout.widget.ConstraintLayout>
            </LinearLayout>
        </LinearLayout>
        <!--    Profile底部列表     -->
        <androidx.core.widget.NestedScrollView
            android:id="@+id/scrollView"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:background="@color/page_bg"
            android:fillViewport="true"
            android:overScrollMode="never"
            android:scrollbars="vertical"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toBottomOf="@id/ll_job_info">
        ...
       </androidx.core.widget.NestedScrollView>
    </androidx.constraintlayout.motion.widget.MotionLayout>

定义的场景xml：

<?xml version="1.0" encoding="utf-8"?>
<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="350">
        <OnSwipe
            motion:dragDirection="dragUp"
            motion:touchAnchorId="@id/scrollView" />
        <KeyFrameSet>
            <KeyPosition
                motion:alpha="0"
                motion:framePosition="25"
                motion:keyPositionType="parentRelative"
                motion:motionTarget="@+id/cl_name_info" />
        </KeyFrameSet>
    </Transition>
    <ConstraintSet android:id="@+id/start">
        <Constraint
            android:id="@id/status_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:alpha="0"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/iv_top_bg"
            android:layout_width="0dp"
            android:layout_height="245dp"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintRight_toRightOf="parent"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/cl_name_info"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="30dp"
            android:layout_marginTop="50dp"
            android:layout_marginRight="15dp"
            android:alpha="1"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintRight_toRightOf="parent"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/ll_job_info"
            android:layout_width="match_parent"
            android:layout_height="117dp"
            android:layout_marginLeft="@dimen/d_15dp"
            android:layout_marginTop="180dp"
            android:layout_marginRight="@dimen/d_15dp"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintRight_toRightOf="parent"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/scrollView"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            motion:layout_constraintBottom_toBottomOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/ll_job_info" />
    </ConstraintSet>
    <ConstraintSet android:id="@+id/end">
        <Constraint
            android:id="@id/status_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:alpha="1"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/iv_top_bg"
            android:layout_width="0dp"
            android:layout_height="0dp"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintRight_toRightOf="parent"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/cl_name_info"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_marginLeft="30dp"
            android:layout_marginTop="50dp"
            android:layout_marginRight="15dp"
            android:alpha="0"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintRight_toRightOf="parent"
            motion:layout_constraintTop_toTopOf="parent" />
        <Constraint
            android:id="@id/ll_job_info"
            android:layout_width="match_parent"
            android:layout_height="117dp"
            android:layout_marginLeft="@dimen/d_15dp"
            android:layout_marginTop="10dp"
            android:layout_marginRight="@dimen/d_15dp"
            motion:layout_constraintLeft_toLeftOf="parent"
            motion:layout_constraintRight_toRightOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/status_view" />
        <Constraint
            android:id="@id/scrollView"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            motion:layout_constraintBottom_toBottomOf="parent"
            motion:layout_constraintTop_toBottomOf="@id/ll_job_info" />
    </ConstraintSet>
</MotionScene>

效果：

总结

类似这样的协调滚动布局，当底部列表滑动的时候，顶部的布局做响应的动作，我们都可以通过 AppBarLayout 和 MotionLayout 来实现。区别只是AppBarLayout实现起来更简单，MotionLayout 的定义可以更细。

需要注意的是 AppBarLayout 定义的方式 可以定义一些相对复杂的页面，如果非常复杂的元素使用 MotionLayout 来作为跟视图，全部的布局一股脑的写在 MotionLayout 中，那么可能导致性能问题的，最直观的感受是启动这个Activity都会很慢。

其实在高刷屏流行的今天，留给我们布局上屏的处理时间越来越少了，如果是特别复杂或是嵌套较深的布局，一定要慎重使用。常见的优化方式是异步加载布局、先展示占位图、优化 MotionLayout 布局，只包裹需要改变的视图。

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