当触摸区域包含 RecyclerView 时，Android MotionLayout OnSwipe 不起作用

Question

我正在尝试实现这个播放器动画

我还希望能够在折叠和展开时同时滑动歌曲。所以想法是使用 MotionLayout与 RecyclerView , 并且还有 RecyclerView 的每一项成为 MotionLayout .这样我可以在 RecyclerView 上应用展开动画并对它的 child 应用过渡。
如附加视频中所示，过渡本身可以正常工作。但是要在 RecyclerView 上工作本身没有。
仅当触摸从 RecyclerView 外部开始时才会检测到拖动。如视频中突出显示的触摸所示，触摸从 RecyclerView 下方开始.
如果触摸开始于 RecyclerView ，歌曲的滚动消耗事件。甚至禁用附带的 LinearLayoutManager 中的滚动不起作用。我也尝试过覆盖 onTouch对于RecyclerView总是返回 false并且不消耗任何触摸事件(理论上)，但这也不起作用。
该项目可以在这里找到 https://github.com/vlatkozelka/PlayerAnimation2
它并不意味着是一个生产就绪的应用程序，只是一个测试游乐场。
这是相关代码
布局 :

<?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="@color/colorPrimary"
    app:layoutDescription="@xml/player_scene"
    tools:context=".MainActivity"
    android:id="@+id/layout_main"
    >

    <FrameLayout
        android:id="@+id/layout_player"
        android:layout_width="match_parent"
        android:layout_height="@dimen/mini_player_height"
        android:elevation="2dp"
        app:layout_constraintBottom_toTopOf="@id/layout_navigation"
        app:layout_constraintStart_toStartOf="parent"
        android:background="@color/dark_grey"
        android:focusable="true"
        android:clickable="true"
        >

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/recycler_songs"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:focusable="false"
            android:clickable="false"
            />
    </FrameLayout>


    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/layout_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/dark_grey"
        android:padding="5dp"
        android:weightSum="3"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent">

        <ImageView
            android:id="@+id/iv_home"
            android:layout_width="0dp"
            android:layout_height="34dp"
            android:layout_weight="1"
            android:tint="#fff"
            app:layout_constraintEnd_toStartOf="@id/iv_search"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            app:srcCompat="@drawable/ic_home_24px" />

        <ImageView
            android:id="@+id/iv_search"
            android:layout_width="0dp"
            android:layout_height="34dp"
            android:layout_weight="1"
            android:tint="#fff"
            app:layout_constraintEnd_toStartOf="@id/iv_library"
            app:layout_constraintStart_toEndOf="@id/iv_home"
            app:layout_constraintTop_toTopOf="parent"
            app:srcCompat="@drawable/ic_search_24px" />

        <ImageView
            android:id="@+id/iv_library"
            android:layout_width="0dp"
            android:layout_height="34dp"
            android:layout_weight="1"
            android:tint="#fff"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@id/iv_search"
            app:layout_constraintTop_toTopOf="parent"
            app:srcCompat="@drawable/ic_library_music_24px" />


    </androidx.constraintlayout.widget.ConstraintLayout>



</androidx.constraintlayout.motion.widget.MotionLayout>

动态场景 :

<?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">

    <Transition
        android:id="@+id/dragUp"
        app:constraintSetEnd="@id/expanded"
        app:constraintSetStart="@id/collapsed">

        <OnSwipe
            app:dragDirection="dragUp"
            app:touchRegionId="@id/layout_player" />

        <OnClick
            app:clickAction="transitionToEnd"
            app:targetId="@id/layout_player" />

    </Transition>

    <Transition
        android:id="@+id/dragDown"
        app:constraintSetEnd="@id/collapsed"
        app:constraintSetStart="@id/expanded">


        <OnSwipe
            app:dragDirection="dragDown"
            app:touchRegionId="@id/layout_player" />

        <OnClick
            app:clickAction="transitionToEnd"
            app:targetId="@id/layout_player" />

    </Transition>

    <ConstraintSet android:id="@+id/collapsed">


        <Constraint
            android:id="@+id/layout_navigation"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/dark_grey"
            android:orientation="horizontal"
            android:padding="5dp"
            android:weightSum="3"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent" />

        <Constraint
            android:id="@+id/layout_player"
            android:layout_width="match_parent"
            android:layout_height="@dimen/mini_player_height"
            android:elevation="2dp"
            app:layout_constraintBottom_toTopOf="@id/layout_navigation"
            app:layout_constraintStart_toStartOf="parent" />

    </ConstraintSet>

    <ConstraintSet android:id="@+id/expanded">


        <Constraint
            android:id="@+id/layout_navigation"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:background="@color/dark_grey"
            android:orientation="horizontal"
            android:padding="5dp"
            android:weightSum="3"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="parent" />

        <Constraint
            android:id="@+id/layout_player"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:elevation="2dp"
            app:layout_constraintBottom_toTopOf="@id/layout_navigation"
            app:layout_constraintStart_toStartOf="parent" />


    </ConstraintSet>

</MotionScene>

主要 Activity :

package com.example.playeranimation2

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.ImageView
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.constraintlayout.motion.widget.MotionLayout
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.PagerSnapHelper
import androidx.recyclerview.widget.RecyclerView
import androidx.viewpager2.widget.ViewPager2
import io.reactivex.subjects.PublishSubject
import org.notests.sharedsequence.Driver


data class AppState(
    val songs: List<Song> = Song.getRandomSongs(),
    val currentSong: Int = 0,
    val expandedPercent: Float = 0f
)

class MainActivity : AppCompatActivity() {

  companion object {
    var appState = AppState()
    val appStateObservable = PublishSubject.create<AppState>()
    val appStateDriver = Driver(appStateObservable.startWith(appState))
  }

  lateinit var mainLayout: MotionLayout
  lateinit var songsRecycler: RecyclerView
  lateinit var playerLayout : ViewGroup
  lateinit var adapter: SongsAdapter
  lateinit var snapHelper: PagerSnapHelper

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    mainLayout = findViewById(R.id.layout_main)
    songsRecycler = findViewById(R.id.recycler_songs)
    playerLayout = findViewById(R.id.layout_player)

    songsRecycler.layoutManager = LinearLayoutManager(this).apply { orientation = LinearLayoutManager.HORIZONTAL }

    adapter = SongsAdapter()

    songsRecycler.adapter = adapter

    adapter.refreshData(appState.songs)

    snapHelper = PagerSnapHelper()
    snapHelper.attachToRecyclerView(songsRecycler)




    mainLayout.setTransitionListener(object : MotionLayout.TransitionListener {
      override fun onTransitionTrigger(p0: MotionLayout?, p1: Int, p2: Boolean, p3: Float) {

      }

      override fun onTransitionStarted(p0: MotionLayout?, p1: Int, p2: Int) {

      }

      override fun onTransitionChange(p0: MotionLayout?, p1: Int, p2: Int, p3: Float) {
        if (p1 == R.id.expanded) {
          appState = appState.copy(expandedPercent = 1f - p3)
        } else {
          appState = appState.copy(expandedPercent = p3)
        }

        emitNewAppState()
        adapter.expandedPercent = appState.expandedPercent

        updateAllRecyclerChildren()
      }

      override fun onTransitionCompleted(p0: MotionLayout?, p1: Int) {

      }

    })

    songsRecycler.addOnScrollListener(object:  RecyclerView.OnScrollListener(){
      override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
        super.onScrolled(recyclerView, dx, dy)
        updateAllRecyclerChildren()
      }
    })
  }

  fun updateAllRecyclerChildren(){
    for (i in appState.songs.indices) {
      val childView = songsRecycler.getChildAt(i)
      if(childView != null){
        val songViewHolder = songsRecycler.getChildViewHolder(childView) as? SongsAdapter.SongViewHolder
        songViewHolder?.setExpandPercent(appState.expandedPercent)
      }
    }
  }

  fun emitNewAppState() {
    appStateObservable.onNext(appState)
  }

  class SongsAdapter : RecyclerView.Adapter<SongsAdapter.SongViewHolder>() {

    val data = arrayListOf<Song>()
    var expandedPercent : Float = 0f

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SongViewHolder {
      val view = LayoutInflater.from(parent.context).inflate(R.layout.item_song, parent, false)
      return SongViewHolder(view)
    }

    override fun getItemCount(): Int {
      return data.size
    }

    override fun onBindViewHolder(holder: SongViewHolder, position: Int) {
      holder.bind(data[position], expandedPercent)
    }

    fun refreshData(data: List<Song>) {
      this.data.clear()
      this.data.addAll(data)
    }


    class SongViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
      var songImageView: ImageView? = itemView.findViewById(R.id.iv_cover_art)
      var songTitleView: TextView? = itemView.findViewById(R.id.tv_song_title)
      var rootView: MotionLayout? = itemView.findViewById(R.id.root_view)

      fun bind(song: Song, expandedPercent: Float) {
        songImageView?.setImageResource(song.imageRes)
        songTitleView?.text = song.title
        setExpandPercent(expandedPercent)
      }

      fun setExpandPercent(percent: Float) {
        rootView?.setInterpolatedProgress(percent)
      }

    }


  }

}

知道如何获得 RecyclerView和 MotionLayout 一起玩拖动手势？

Answer 1

我遇到了同样的问题，我被困了超过 5 天，最后，我找到了一个可能适合你的简单解决方案。
问题是当用户触摸屏幕并且没有将其转发到运动布局以应用滑动动画时，回收器 View 获得焦点。
所以，我只是在回收器 View 上添加了一个触摸监听器，并将其转发给运动布局类的 on touch 方法。检查代码

recyclerView.setOnTouchListener { _, event ->
            binding.motionLayout.onTouchEvent(event)
            return@setOnTouchListener false
        }

只需从 onTouchListener 中获取运动事件并将其转发给运动布局中的 onTouchEvent 方法
希望对你有所帮助；)