activity kotlin RecyclerView 左滑显示删除按钮 删除item 完整的全部代码实现

以下是一个基本的实现：

1. 创建一个 RecyclerView。

2. 创建一个 Adapter，将数据和 ViewHolder 绑定在一起。

3. 在 ViewHolder 类中添加一个 SwipeLayout，它将包含一个删除按钮和内容视图。

4. 在 Adapter 中实现 ItemTouchHelper.Callback 接口，以便可以监听 RecyclerView 上的滑动事件。

5. 在 onSwiped 方法中，删除被滑动的项目。

以下是完整的代码实现：

1. 创建 RecyclerView：

<androidx.recyclerview.widget.RecyclerView
    android:id="@+id/recycler_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

2. 创建 Adapter：

class MyAdapter(private val items: List<String>) : RecyclerView.Adapter<MyAdapter.ViewHolder>() {

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

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.bind(items[position])
    }

    override fun getItemCount() = items.size

    inner class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        private val swipeLayout: SwipeLayout = itemView.findViewById(R.id.swipe_layout)
        private val textView: TextView = itemView.findViewById(R.id.text_view)
        private val deleteButton: Button = itemView.findViewById(R.id.delete_button)

        fun bind(item: String) {
            textView.text = item

            deleteButton.setOnClickListener {
                items.toMutableList().removeAt(adapterPosition)
                notifyItemRemoved(adapterPosition)
            }

            swipeLayout.addSwipeListener(object : SimpleSwipeListener() {
                override fun onOpen(layout: SwipeLayout) {
                    super.onOpen(layout)
                    closeAllItems()
                    swipeLayout.open(true)
                }
            })
        }

        private fun closeAllItems() {
            for (i in 0 until itemCount) {
                (recyclerView.findViewHolderForAdapterPosition(i) as? ViewHolder)?.swipeLayout?.close(true)
            }
        }
    }
}

3. 创建 item_layout.xml 文件：

<?xml version="1.0" encoding="utf-8"?>
<com.daimajia.swipe.SwipeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:swipe="http://schemas.android.com/apk/res-auto"
    android:id="@+id/swipe_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    swipe:sensitivity="0.2"
    swipe:show_mode="pull_out"
    swipe:leftEdgeSwipeOffset="0dp"
    swipe:rightEdgeSwipeOffset="0dp"
    swipe:leftSwipeEnabled="false"
    swipe:rightSwipeEnabled="true">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/white"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:padding="16dp">

        <TextView
            android:id="@+id/text_view"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:textSize="18sp" />

        <Button
            android:id="@+id/delete_button"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:background="@color/red"
            android:text="@string/delete"
            android:textColor="@color/white" />
    </LinearLayout>
</com.daimajia.swipe.SwipeLayout>

4. 实现 ItemTouchHelper.Callback 接口：

class SwipeToDeleteCallback(private val adapter: MyAdapter) : ItemTouchHelper.Callback() {

    override fun getMovementFlags(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder): Int {
        return makeMovementFlags(0, ItemTouchHelper.LEFT or ItemTouchHelper.RIGHT)
    }

    override fun onMove(recyclerView: RecyclerView, viewHolder: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean {
        return false
    }

    override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
        adapter.items.toMutableList().removeAt(viewHolder.adapterPosition)
        adapter.notifyItemRemoved(viewHolder.adapterPosition)
    }

    override fun isLongPressDragEnabled() = false

    override fun isItemViewSwipeEnabled() = true
}

5. 在 Activity 或 Fragment 中实现：

class MainActivity : AppCompatActivity() {

    private lateinit var recyclerView: RecyclerView
    private lateinit var adapter: MyAdapter

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

        recyclerView = findViewById(R.id.recycler_view)
        adapter = MyAdapter(listOf("Item 1", "Item 2", "Item 3"))
        recyclerView.adapter = adapter

        val itemTouchHelper = ItemTouchHelper(SwipeToDeleteCallback(adapter))
        itemTouchHelper.attachToRecyclerView(recyclerView)
    }
}