所以我们试图模仿可窥视的行为BottomSheetLayout
(从屏幕底部窥视的底部视图,向上滚动时进入全屏视图,有点像这样:https://www. youtube.com/watch?v=yrZVLL-z6P4 ) 使用MotionLayout
, 版本2.0.0-alpha4
.
问题是可OnSwipe
窥视视图上的过渡不适用于视图本身,它显然适用于下面的整个视图,在这种情况下是 a RecyclerView
. 因此,当我们滚动 时RecyclerView
,过渡正在运行。
root_view.xml
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.constraintlayout.motion.widget.MotionLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layoutDescription="@xml/motion_scene">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="0dp"
android:clipToPadding="false"
android:paddingBottom="@dimen/margin_48"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@+id/btn"
android:layout_width="match_parent"
android:layout_height="@dimen/size_48"
android:elevation="@dimen/elevation_12"
android:gravity="center"
app:layout_constraintBottom_toBottomOf="parent" />
<androidx.appcompat.widget.AppCompatImageView
android:id="@+id/arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:elevation="@dimen/elevation_12"
android:rotation="90"
app:layout_constraintBottom_toBottomOf="@id/btn"
app:layout_constraintEnd_toEndOf="@id/btn"
app:layout_constraintTop_toTopOf="@id/btn" />
<FrameLayout
android:id="@+id/fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="@dimen/elevation_8"
app:layout_constraintTop_toBottomOf="parent" />
</androidx.constraintlayout.motion.widget.MotionLayout>
</FrameLayout>
motion_scene.xml
<Transition
android:id="@+id/swipe"
app:constraintSetEnd="@id/end"
app:constraintSetStart="@id/start"
app:duration="250">
<OnSwipe
app:dragDirection="dragUp"
app:touchAnchorId="@id/btn" />
</Transition>
<ConstraintSet android:id="@+id/start">
<Constraint
android:id="@id/fragment"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintTop_toBottomOf="parent" />
<Constraint
android:id="@id/btn"
android:layout_width="match_parent"
android:layout_height="@dimen/size_48"
app:layout_constraintBottom_toBottomOf="parent" />
</ConstraintSet>
<ConstraintSet android:id="@+id/end">
<Constraint
android:id="@id/fragment"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="@id/btn" />
<Constraint
android:id="@id/btn"
android:layout_width="match_parent"
android:layout_height="@dimen/size_48"
app:layout_constraintTop_toTopOf="parent" />
</ConstraintSet>