问题描述
我正在将当前的约束布局转换为动画的MotionLayout。我所做的非常简单,当用户滚动第二个回收站视图时,第一个回收站视图应处于隐藏状态。一旦我从API获得数据,标头就应该可见。所以我的布局是这样的:
<?xml version="1.0" encoding="utf-8"?>
<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"
android:background="@drawable/background_gradient"
app:layoutDescription="@xml/fragment_scene">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rvList"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingBottom="@dimen/spacing_24dp"
android:scrollbars="none"
app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/toolbar"
tools:itemCount="3"
tools:listitem="@layout/view_items" />
<com.google.android.material.tabs.TabLayout
android:id="@+id/tlContainer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/rvList"
app:tabGravity="fill"
app:tabIndicatorColor="@color/colorPrimaryBlue"
app:tabIndicatorFullWidth="false"
app:tabInlineLabel="false"
app:tabMode="auto"
app:tabPaddingEnd="@dimen/spacing_8dp"
app:tabPaddingStart="@dimen/spacing_8dp"
app:tabSelectedTextColor="@color/colorAccent"
app:tabTextAppearance="@style/TextAppearance.Roboto.Bold"
app:tabTextColor="@color/white50">
<com.google.android.material.tabs.TabItem
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Favorites" />
</com.google.android.material.tabs.TabLayout>
<include
android:id="@+id/containerHeader"
layout="@layout/view_header"
android:layout_width="0dp"
android:layout_height="45dp"
android:visibility="gone"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/tlContainer"
tools:visibility="visible" />
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/rvList2"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/containerHeader"
tools:listitem="@layout/view_list_item" />
<androidx.appcompat.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:gravity="center"
android:minHeight="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:layout_collapseMode="pin"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:titleTextColor="@color/colorAccent">
<TextView
style="@style/TextAppearance.AppCompat.Widget.ActionBar.Title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="Home"
android:textAppearance="@style/TextAppearance.Roboto.Bold"
android:textColor="@color/colorAccent"
android:textSize="@dimen/font_size_16"
tools:text="Home" />
<ImageView
android:id="@+id/ivSearch"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:paddingRight="@dimen/spacing_8dp"
app:srcCompat="@drawable/ic_search_white_24dp" />
<ImageView
android:id="@+id/ivOpenDetail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:paddingRight="@dimen/spacing_8dp"
app:srcCompat="@drawable/ic_settings_white_24dp" />
</androidx.appcompat.widget.Toolbar>
</androidx.constraintlayout.motion.widget.MotionLayout>
场景xml是
<?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/expand">
<Constraint android:id="@id/containerHeader">
<PropertySet
app:applyMotionScene="false"
app:visibilityMode="ignore" />
</Constraint>
</ConstraintSet>
<ConstraintSet android:id="@+id/collapse">
<Constraint
android:id="@id/rvList"
android:alpha="0"
motion:layout_constraintEnd_toEndOf="parent"
motion:layout_constraintStart_toStartOf="parent" />
<Constraint
android:id="@id/containerHeader">
<PropertySet
app:applyMotionScene="false"
app:visibilityMode="ignore" />
</Constraint>
</ConstraintSet>
<Transition
app:constraintSetEnd="@id/collapse"
app:constraintSetStart="@id/expand">
<OnSwipe
app:dragDirection="dragUp"
app:touchAnchorId="@id/rvList2" />
</Transition>
</MotionScene>
奇怪的是,我第一次将containerHeader
设置为View.Gone
,并且视图可见性应取决于api响应。但是,当我运行应用程序时,在为容器标题设置View.Visbile
之后,containerHeader会占用空间,但是无法显示任何内容。我找不到任何线索。
我在MotionLayout上做错了吗?感谢任何帮助或建议。
解决方法
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