标签: constraintset

我正在为我的回收站视图项目使用约束布局。为了动画（展开/折叠）它们，我使用约束集动画。开场动画在所有项目上运行良好。关闭动画也运行良好，但是当关闭动画在不是最后一个的项目上开始时，所有项目在动画开始时都会跳起来，而不是在动画结束时。

动画在项目点击时执行：

itemView.setOnClickListener {
                val smallItemConstraint = ConstraintSet()
                smallItemConstraint.clone(itemView.context, R.layout.day_of_week_small)
                val largeItemConstraint = ConstraintSet()
                largeItemConstraint.clone(itemView.context, R.layout.day_of_week)

                val constraintToApply = if (isViewExpanded) smallItemConstraint else
                    largeItemConstraint

                animateItemView(constraintToApply, itemView.dayOfWeekConstraintLayout)

                if (!isViewExpanded) {
                    itemView.dayOfWeekWeatherIcon.visibility = View.VISIBLE
                } else {
                    itemView.dayOfWeekWeatherIcon.visibility = View.GONE
                }

                isViewExpanded = !isViewExpanded
            }

animateItemView 在哪里：

private fun animateItemView(constraintToApply: ConstraintSet,
                                constraintLayout: ConstraintLayout) {
        TransitionManager.beginDelayedTransition(constraintLayout)
        constraintToApply.applyTo(constraintLayout)
    }

day_of_week.xml（扩展）布局：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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/dayOfWeekConstraintLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/dayOfWeekWeatherIcon"
        android:layout_width="90dp"
        android:layout_height="90dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="8dp"
        android:contentDescription="@string/weather_image"
        app:layout_constraintBottom_toBottomOf="@+id/dayOfWeekHumidityLabel"
        app:layout_constraintEnd_toStartOf="@+id/dayOfWeekItemVerticalGuideline"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:srcCompat="@tools:sample/avatars" …

我有以下活动和布局：

import android.os.Bundle
import android.view.Gravity
import android.view.View
import androidx.appcompat.app.AppCompatActivity
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.constraintlayout.widget.ConstraintSet
import androidx.transition.Slide
import androidx.transition.TransitionManager
import com.tests.playground.R


class ConstraintLayoutTransitionActivity : AppCompatActivity() {

    private val rootView: ConstraintLayout by lazy { findViewById(R.id.root) }
    private val bottomBlueView: View by lazy { findViewById(R.id.bottomBlue) }
    private val switchButton: View by lazy { findViewById(R.id.switchButton) }
    private var isBottomBlueViewShowing = true

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_constraint_layout_transition)

        switchButton.setOnClickListener(::onSwitchButtonClicked)
    }

    @Synchronized
    private fun onSwitchButtonClicked(view: View) {
        isBottomBlueViewShowing = !isBottomBlueViewShowing

        val constraintSet = ConstraintSet()
        constraintSet.clone(rootView)

        val …