在Android中实现多选项视图的动画效果

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猴君
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在 Android 中,要实现多选项视图的动画效果,可以使用 RecyclerViewItemAnimator

  1. 首先,在项目的 build.gradle 文件中添加 RecyclerView 依赖:
dependencies {     implementation 'com.android.support:recyclerview-v7:28.0.0' } 
  1. 在布局文件中添加 RecyclerView:
    android:id="@+id/recycler_view"     android:layout_width="match_parent"     android:layout_height="wrap_content"/> 
  1. 创建一个表示选项的数据类:
data class Option(val text: String, var isSelected: Boolean) 
  1. 创建一个用于显示选项的 RecyclerView 适配器:
class OptionsAdapter(private val options: List<Option>) : RecyclerView.Adapter<OptionsAdapter.ViewHolder>() {      class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {         val textView: TextView = itemView.findViewById(R.id.option_text)     }      override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {         val view = LayoutInflater.from(parent.context).inflate(R.layout.option_item, parent, false)         return ViewHolder(view)     }      override fun onBindViewHolder(holder: ViewHolder, position: Int) {         val option = options[position]         holder.textView.text = option.text         holder.textView.setOnClickListener {             option.isSelected = !option.isSelected             notifyItemChanged(position)         }     }      override fun getItemCount(): Int = options.size } 
  1. 在 Activity 或 Fragment 中设置 RecyclerView 和适配器:
val recyclerView: RecyclerView = findViewById(R.id.recycler_view) recyclerView.layoutManager = LinearLayoutManager(this) recyclerView.adapter = OptionsAdapter(listOf(     Option("Option 1", false),     Option("Option 2", false),     Option("Option 3", false) )) 
  1. 创建一个自定义 ItemAnimator 类以实现动画效果:
class CustomItemAnimator : DefaultItemAnimator() {      override fun animateChange(         oldHolder: RecyclerView.ViewHolder,         newHolder: RecyclerView.ViewHolder,         fromX: Int,         fromY: Int,         toX: Int,         toY: Int     ): Boolean {         if (oldHolder == newHolder) {             val view = oldHolder.itemView             val animator = ValueAnimator.ofFloat(0f, 1f).apply {                 addUpdateListener { animation ->                     val value = animation.animatedValue as Float                     view.scaleX = 1 - value * 0.1f                     view.scaleY = 1 - value * 0.1f                     if (value >= 0.5f) {                         view.alpha = (1 - value) * 2                     }                 }                 duration = changeDuration                 interpolator = interpolator             }             animator.start()             return true         }         return super.animateChange(oldHolder, newHolder, fromX, fromY, toX, toY)     } } 
  1. 将自定义 ItemAnimator 应用到 RecyclerView:
recyclerView.itemAnimator = CustomItemAnimator() 

现在,当您点击选项时,它们将以动画形式更改其大小和透明度。您可以根据需要调整动画参数。

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