问题
My problem is, that I constantly get the warning W/MotionLayout: WARNING could not find view id -1. Because of this, my MotionLayout is really laggy and nearly jumps from the expanded state to the collapsed state. After waiting a couple of seconds, the animation starts getting better (no jumping / laggs anymore), but the warning remains.
Base XML
<layout 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">
<data>
<variable
name="product"
type="com.example.app.framework.datasource.models.product.Product" />
</data>
<androidx.constraintlayout.motion.widget.MotionLayout
android:id="@+id/shop_motion_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layoutDescription="@xml/shop_item_content_scene"
app:showPaths="true"
tools:context=".framework.ui.view.fragments.shop.ShopItemFragment">
<com.google.android.material.appbar.MaterialToolbar
android:id="@+id/shop_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Light"
app:menu="@menu/shop_item_toolbar"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/product_image"
android:layout_width="0dp"
android:layout_height="142dp"
android:layout_marginStart="72dp"
android:layout_marginTop="@dimen/standard8dpMargin"
android:layout_marginEnd="72dp"
android:adjustViewBounds="true"
android:contentDescription="@null"
android:fitsSystemWindows="true"
app:loadImage="@{product.images[0]}"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/shop_toolbar" />
<com.google.android.material.textview.MaterialTextView
android:id="@+id/product_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/big16dpMargin"
android:layout_marginBottom="12dp"
android:ellipsize="end"
android:fontFamily="sans-serif-medium"
android:maxLines="2"
android:text="@{product.name}"
android:textAlignment="textStart"
android:textColor="@color/color_text_dark"
android:textSize="@dimen/textHeadlineNormal1"
app:layout_constraintBottom_toTopOf="@id/scrollview_shop"
app:layout_constraintEnd_toEndOf="@id/barrier"
app:layout_constraintStart_toStartOf="@id/margin_left"
app:layout_constraintTop_toBottomOf="@+id/product_image"
tools:text="Long text to test some stuff etc. bla bla" />
<com.google.android.material.button.MaterialButton
android:id="@+id/btn_shop"
style="@style/Widget.MaterialComponents.Button.Icon"
android:layout_width="56dp"
android:layout_height="56dp"
android:layout_marginEnd="16dp"
android:backgroundTint="@color/color_btn_blue"
android:insetLeft="0dp"
android:insetTop="0dp"
android:insetRight="0dp"
android:insetBottom="0dp"
android:padding="0dp"
app:icon="@drawable/ic_shopping_cart_filled"
app:iconGravity="textStart"
app:iconPadding="0dp"
app:layout_constraintBottom_toTopOf="@id/scrollview_shop"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="@id/scrollview_shop"
app:shapeAppearanceOverlay="@style/ShapeAppearanceOverlay.Example.Button.Circle" />
<!-- My scrollview -->
<androidx.core.widget.NestedScrollView
android:id="@+id/scrollview_shop"
android:layout_width="0dp"
android:layout_height="0dp"
android:fillViewport="true"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/product_name">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@+id/someID"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.textview.MaterialTextView
android:id="@+id/product_article_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/standard8dpMargin"
android:text="FISCH"
android:textAlignment="textStart"
android:textColor="@color/color_text_gray"
android:textDirection="locale"
android:textSize="@dimen/textDescriptionNormal2"
android:textStyle="normal"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="A 1234567" />
<com.google.android.material.textview.MaterialTextView
android:id="@+id/tv_mwst_disclaimer"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="@dimen/standard8dpMargin"
android:text="SEIFE"
android:textAlignment="textStart"
android:textColor="@color/color_text_mwst"
android:textDirection="locale"
android:textSize="@dimen/textDescriptionNormal4"
android:textStyle="italic"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/product_article_number"
tools:text="PREIS" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.core.widget.NestedScrollView>
<androidx.constraintlayout.widget.Barrier
android:id="@+id/barrier"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:barrierDirection="left"
app:constraint_referenced_ids="btn_shop" />
<androidx.constraintlayout.widget.Guideline
android:id="@+id/margin_left"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
app:layout_constraintGuide_begin="@dimen/big16dpMargin" />
</androidx.constraintlayout.motion.widget.MotionLayout>
</layout>
ContentScene XML
<?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/tools">
<Transition
app:constraintSetEnd="@id/collapsed"
app:constraintSetStart="@id/expanded">
<OnSwipe
motion:dragDirection="dragUp"
app:onTouchUp="stop"
motion:touchAnchorId="@id/scrollview_shop"
motion:touchAnchorSide="top" />
<KeyFrameSet>
<KeyAttribute
app:motionTarget="@id/product_image"
app:framePosition="40"
android:alpha="0.0" />
</KeyFrameSet>
</Transition>
<ConstraintSet android:id="@+id/expanded" />
<ConstraintSet android:id="@+id/collapsed">
<Constraint
android:id="@id/product_image"
android:layout_height="?attr/actionBarSize"
android:layout_marginStart="56dp"
android:layout_marginEnd="56dp"
android:alpha="0.0"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Constraint
android:id="@id/product_name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="56dp"
android:layout_marginEnd="@dimen/standard8dpMargin"
android:scaleX="0.925"
android:scaleY="0.925"
app:layout_constraintBottom_toBottomOf="@id/shop_toolbar"
app:layout_constraintTop_toTopOf="@id/shop_toolbar"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintEnd_toEndOf="@id/barrier" />
<Constraint
android:id="@id/btn_shop"
android:layout_marginEnd="@dimen/big16dpMargin"
android:layout_width="56dp"
android:layout_height="56dp"
app:layout_constraintBottom_toBottomOf="@id/shop_toolbar"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toBottomOf="@+id/product_name" />
</ConstraintSet>
</MotionScene>
Fragment
class ShopItemFragment : Fragment(R.layout.fragment_shop_item) {
private val productArgs by navArgs<ShopItemFragmentArgs>()
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? = FragmentShopItemBinding.inflate(inflater, container, false).apply {
product = productArgs.product
}.root
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
initToolbar()
}
private fun initToolbar() = shop_toolbar.apply {
setupWithNavController(findNavController(), AppBarConfiguration(findNavController().graph))
}
}
Expanded
Collapsed
回答1:
You should have the same <Constraint ../> in both <ConstraintSet ../>
Please try to update you scene and add:
<ConstraintSet android:id="@+id/expanded" >
<Constraint
android:id="@id/product_image"
.... />
<Constraint
android:id="@id/product_name"
.... />
<Constraint
android:id="@id/btn_shop"
.... />
</ConstraintSet>
来源：https://stackoverflow.com/questions/64303458/motionlayout-warning-could-not-find-view-id-1