实现了双屏摄像头显示，添加了部分代码

app/src/main/java/com/sw/dualscreen/adapter/BaseViewHolder.kt

@@ -1,9 +0,0 @@
-package com.sw.dualscreen.adapter
-
-import androidx.recyclerview.widget.RecyclerView
-import androidx.viewbinding.ViewBinding
-
-abstract class BaseViewHolder<B : ViewBinding, T>(val binding: B) :
-    RecyclerView.ViewHolder(binding.root) {
-    abstract fun bind(item: T)
-}

app/src/main/java/com/sw/dualscreen/adapter/GenericItemAdapter.kt

@@ -0,0 +1,38 @@
+package com.sw.dualscreen.adapter
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import androidx.viewbinding.ViewBinding
+
+/**
+ * 通用子项适配器（支持ViewBinding）
+ */
+class GenericItemAdapter<T, VB : ViewBinding>(
+    private var items: List<T>,
+    private val bindingInflater: (LayoutInflater, ViewGroup, Boolean) -> VB,
+    private val bindCallback: VB.(item: T, position: Int) -> Unit,
+) : RecyclerView.Adapter<GenericItemAdapter<T, VB>.ViewHolder>() {
+
+    inner class ViewHolder(private val binding: VB) : RecyclerView.ViewHolder(binding.root) {
+        fun bind(item: T, position: Int) {
+            binding.bindCallback(item, position)
+        }
+    }
+
+    fun updateData(newItem: List<T>) {
+        this.items = newItem
+        notifyDataSetChanged()
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
+        val binding = bindingInflater(LayoutInflater.from(parent.context), parent, false)
+        return ViewHolder(binding)
+    }
+
+    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
+        holder.bind(items[position], position)
+    }
+
+    override fun getItemCount(): Int = items.size
+}

app/src/main/java/com/sw/dualscreen/adapter/GridRecyclerAdapter.kt

@@ -1,31 +0,0 @@
-package com.sw.dualscreen.adapter
-
-import android.view.LayoutInflater
-import android.view.ViewGroup
-import androidx.recyclerview.widget.RecyclerView
-import androidx.viewbinding.ViewBinding
-
-class GridRecyclerAdapter<T, B : ViewBinding>(
-    private val itemList: List<T>,
-    private val bindingInflater: (LayoutInflater, ViewGroup, Boolean) -> B,
-    private val bindHolder: (B, T) -> Unit,
-    private val onItemClick: ((T) -> Unit)? = null
-) : RecyclerView.Adapter<BaseViewHolder<B, T>>() {
-
-    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseViewHolder<B, T> {
-        val inflater = LayoutInflater.from(parent.context)
-        val binding = bindingInflater(inflater, parent, false)
-        return object : BaseViewHolder<B, T>(binding) {
-            override fun bind(item: T) = bindHolder(binding, item)
-        }
-    }
-
-    override fun onBindViewHolder(holder: BaseViewHolder<B, T>, position: Int) {
-        holder.bind(itemList[position])
-        holder.itemView.setOnClickListener {
-            onItemClick?.invoke(itemList[position])
-        }
-    }
-
-    override fun getItemCount(): Int = itemList.size
-}

app/src/main/java/com/sw/dualscreen/adapter/GridSpacingItemDecoration.kt

@@ -1,16 +1,17 @@
 package com.sw.dualscreen.adapter
 
+import android.content.Context
 import android.graphics.Rect
 import android.view.View
 import androidx.recyclerview.widget.RecyclerView
 
 /**
- * item间距
+ * 为RecyclerView添加间距的ItemDecoration
  */
 class GridSpacingItemDecoration(
-    private val spanCount: Int,
-    private val spacing: Int,
-    private val includeEdge: Boolean
+    private val spanCount: Int,         // 列数
+    private val spacing: Int,           // 间距(dp)
+    private val includeEdge: Boolean    // 是否包含边缘
 ) : RecyclerView.ItemDecoration() {
 
     override fun getItemOffsets(
@@ -19,18 +20,35 @@ class GridSpacingItemDecoration(
         parent: RecyclerView,
         state: RecyclerView.State
     ) {
-        val position = parent.getChildAdapterPosition(view)
-        val column = position % spanCount
+        val position = parent.getChildAdapterPosition(view) // item position
+        val column = position % spanCount // item column
 
         if (includeEdge) {
+            // 左右间距计算
             outRect.left = spacing - column * spacing / spanCount
             outRect.right = (column + 1) * spacing / spanCount
-            if (position < spanCount) outRect.top = spacing
-            outRect.bottom = spacing
+
+            // 第一行添加顶部间距
+            if (position < spanCount) {
+                outRect.top = spacing
+            }
+            outRect.bottom = spacing // 每行底部都添加间距
         } else {
+            // 左右间距计算(不包含边缘)
             outRect.left = column * spacing / spanCount
             outRect.right = spacing - (column + 1) * spacing / spanCount
-            if (position >= spanCount) outRect.top = spacing
+
+            // 不是第一行时添加顶部间距
+            if (position >= spanCount) {
+                outRect.top = spacing
+            }
         }
     }
+}
+
+/**
+ * 将dp值转换为px
+ */
+fun Context.dpToPx(dp: Int): Int {
+    return (dp * resources.displayMetrics.density).toInt()
 }