findViewById复用

EspoirX · Jun 16, 2021 · 9e28eb4 · 9e28eb4
1 parent 705f764
commit 9e28eb4
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Showing 6 changed files with 68 additions and 45 deletions.
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
diff --git a/.idea/misc.xml b/.idea/misc.xml
diff --git a/library/src/main/java/com/lzx/library/EfficientAdapter.kt b/library/src/main/java/com/lzx/library/EfficientAdapter.kt
@@ -2,9 +2,10 @@ package com.lzx.library
 
 import android.support.v4.util.SparseArrayCompat
 import android.support.v7.widget.RecyclerView
+import android.view.LayoutInflater
 import android.view.ViewGroup
 
-open class EfficientAdapter<T> : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
+open class EfficientAdapter<T> : RecyclerView.Adapter<BaseViewHolder>() {
 
     companion object {
         private const val FALLBACK_DELEGATE_VIEW_TYPE = Int.MAX_VALUE - 1
@@ -13,25 +14,26 @@ open class EfficientAdapter<T> : RecyclerView.Adapter<RecyclerView.ViewHolder>()
     var items: MutableList<T>? = mutableListOf()
     private val typeHolders: SparseArrayCompat<ViewHolderCreator<T>> = SparseArrayCompat()
 
-    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseViewHolder {
         val holder = getHolderForViewType(viewType)
-                ?: throw NullPointerException("No Holder added for ViewType $viewType")
-        return BaseViewHolder(parent, holder.getResourceId())
+            ?: throw NullPointerException("No Holder added for ViewType $viewType")
+        val view = LayoutInflater.from(parent.context).inflate(holder.getResourceId(), parent, false)
+        return BaseViewHolder(view)
     }
 
     override fun getItemCount(): Int = items?.size ?: 0
 
-    override fun onBindViewHolder(viewHolder: RecyclerView.ViewHolder, position: Int) {
+    override fun onBindViewHolder(viewHolder: BaseViewHolder, position: Int) {
         onBindViewHolder(viewHolder, position, mutableListOf())
     }
 
     override fun onBindViewHolder(
-            viewHolder: RecyclerView.ViewHolder, position: Int, payloads: MutableList<Any>
+        viewHolder: BaseViewHolder, position: Int, payloads: MutableList<Any>
     ) {
         val holder = getHolderForViewType(viewHolder.itemViewType)
-                ?: throw NullPointerException(
-                        "No Holder added for ViewType " + viewHolder.itemViewType)
-        holder.registerItemView(viewHolder.itemView)
+            ?: throw NullPointerException(
+                "No Holder added for ViewType " + viewHolder.itemViewType)
+        holder.registerViewHolder(viewHolder)
         holder.onBindViewHolder(items?.get(position), items, position, holder)
     }
 
@@ -49,7 +51,7 @@ open class EfficientAdapter<T> : RecyclerView.Adapter<RecyclerView.ViewHolder>()
 
         //找不到匹配的 viewType
         throw NullPointerException(
-                "No holder added that matches at position=$position in data source")
+            "No holder added that matches at position=$position in data source")
     }
 
     private fun getHolderForViewType(viewType: Int): ViewHolderCreator<T>? {
@@ -65,8 +67,8 @@ open class EfficientAdapter<T> : RecyclerView.Adapter<RecyclerView.ViewHolder>()
             viewType++
             require(viewType != FALLBACK_DELEGATE_VIEW_TYPE) {
                 "Oops, we are very close to Integer.MAX_VALUE. " +
-                        "It seems that there are no more free and " +
-                        "unused view type integers left to add another holder."
+                    "It seems that there are no more free and " +
+                    "unused view type integers left to add another holder."
             }
         }
         return addTypeHolder(viewType, holder)
@@ -81,11 +83,11 @@ open class EfficientAdapter<T> : RecyclerView.Adapter<RecyclerView.ViewHolder>()
         }
         require(viewType != FALLBACK_DELEGATE_VIEW_TYPE) {
             "The view type = " + FALLBACK_DELEGATE_VIEW_TYPE +
-                    " is reserved for fallback adapter holder Please use another view type."
+                " is reserved for fallback adapter holder Please use another view type."
         }
         require(typeHolders.get(viewType) == null) {
             "An holder is already registered for the viewType = $viewType. Already registered holder is " +
-                    typeHolders.get(viewType)
+                typeHolders.get(viewType)
         }
         typeHolders.put(viewType, holder)
     }
@@ -132,8 +134,8 @@ open class EfficientAdapter<T> : RecyclerView.Adapter<RecyclerView.ViewHolder>()
             viewType++
             require(viewType != FALLBACK_DELEGATE_VIEW_TYPE) {
                 "Oops, we are very close to Integer.MAX_VALUE. " +
-                        "It seems that there are no more free" +
-                        "and unused view type integers left to add another holder."
+                    "It seems that there are no more free" +
+                    "and unused view type integers left to add another holder."
             }
         }
         return register(viewType, holder)
@@ -145,7 +147,7 @@ open class EfficientAdapter<T> : RecyclerView.Adapter<RecyclerView.ViewHolder>()
     fun register(viewType: Int, holder: ViewHolderCreator<T>) = apply {
         require(viewType != FALLBACK_DELEGATE_VIEW_TYPE) {
             "The view type = $FALLBACK_DELEGATE_VIEW_TYPE is reserved " +
-                    "for fallback adapter holder). Please use another view type."
+                "for fallback adapter holder). Please use another view type."
         }
         typeHolders.put(viewType, holder)
     }

diff --git a/library/src/main/java/com/lzx/library/EfficientAdapterExt.kt b/library/src/main/java/com/lzx/library/EfficientAdapterExt.kt
@@ -24,15 +24,15 @@ fun <T : Any> EfficientAdapter<T>.addItem(resourceId: Int, init: ViewHolderDsl<T
 class ViewHolderDsl<T>(private val resourceId: Int) : ViewHolderCreator<T>() {
 
     private var viewType: ((data: T?, position: Int) -> Boolean)? = null
-    private var viewHolder: ((data: T?, position: Int, holder: ViewHolderCreator<T>) -> Unit)? =
+    private var holderCreator: ((data: T?, position: Int, holder: ViewHolderCreator<T>) -> Unit)? =
             null
 
     fun isForViewType(viewType: (data: T?, position: Int) -> Boolean) {
         this.viewType = viewType
     }
 
     fun bindViewHolder(holder: (data: T?, position: Int, holder: ViewHolderCreator<T>) -> Unit) {
-        viewHolder = holder
+        holderCreator = holder
     }
 
     override fun isForViewType(data: T?, position: Int): Boolean {
@@ -42,7 +42,7 @@ class ViewHolderDsl<T>(private val resourceId: Int) : ViewHolderCreator<T>() {
     override fun getResourceId() = resourceId
 
     override fun onBindViewHolder(data: T?, items: MutableList<T>?, position: Int, holder: ViewHolderCreator<T>) {
-        viewHolder?.invoke(data, position, holder)
+        holderCreator?.invoke(data, position, holder)
     }
 }
 

diff --git a/library/src/main/java/com/lzx/library/ViewHolderCreator.kt b/library/src/main/java/com/lzx/library/ViewHolderCreator.kt
@@ -3,42 +3,52 @@ package com.lzx.library
 import android.graphics.Bitmap
 import android.graphics.drawable.Drawable
 import android.os.Build
+import android.support.annotation.IdRes
 import android.support.v7.widget.RecyclerView
+import android.util.SparseArray
 import android.util.TypedValue
-import android.view.LayoutInflater
 import android.view.View
 import android.view.View.OnLongClickListener
 import android.view.ViewGroup
 import android.widget.ImageView
 import android.widget.TextView
 
-class BaseViewHolder(parent: ViewGroup, resource: Int) : RecyclerView.ViewHolder(
-        LayoutInflater.from(parent.context).inflate(resource, parent, false)
-)
+class BaseViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+    val views = SparseArray<View>()
+
+    fun <T : View> findViewById(@IdRes viewId: Int): T {
+        var view = views[viewId]
+        if (view == null) {
+            view = itemView.findViewById(viewId)
+            views.put(viewId, view)
+        }
+        return view as T
+    }
+}
 
 abstract class ViewHolderCreator<T> {
     abstract fun isForViewType(data: T?, position: Int): Boolean
     abstract fun getResourceId(): Int
     abstract fun onBindViewHolder(
-            data: T?,
-            items: MutableList<T>?,
-            position: Int,
-            holder: ViewHolderCreator<T>
+        data: T?,
+        items: MutableList<T>?,
+        position: Int,
+        holder: ViewHolderCreator<T>
     )
 
-    var itemView: View? = null
+    var viewHolder: BaseViewHolder? = null
 
-    fun registerItemView(itemView: View?) {
-        this.itemView = itemView
+    fun registerViewHolder(viewHolder: BaseViewHolder?) {
+        this.viewHolder = viewHolder
     }
 
     fun <V : View> findViewById(viewId: Int): V {
         checkItemView()
-        return itemView!!.findViewById(viewId)
+        return viewHolder!!.findViewById(viewId)
     }
 
     private fun checkItemView() {
-        if (itemView == null) {
+        if (viewHolder == null) {
             throw NullPointerException("itemView is null")
         }
     }
@@ -79,15 +89,15 @@ fun <T> ViewHolderCreator<T>.setBackgroundResource(viewId: Int, resid: Int) = ap
 }
 
 fun <T> ViewHolderCreator<T>.visible(id: Int) =
-        apply { findViewById<View>(id).visibility = View.VISIBLE }
+    apply { findViewById<View>(id).visibility = View.VISIBLE }
 
 fun <T> ViewHolderCreator<T>.invisible(id: Int) =
-        apply { findViewById<View>(id).visibility = View.INVISIBLE }
+    apply { findViewById<View>(id).visibility = View.INVISIBLE }
 
 fun <T> ViewHolderCreator<T>.gone(id: Int) = apply { findViewById<View>(id).visibility = View.GONE }
 
 fun <T> ViewHolderCreator<T>.visibility(id: Int, visibility: Int) =
-        apply { findViewById<View>(id).visibility = visibility }
+    apply { findViewById<View>(id).visibility = visibility }
 
 fun <T> ViewHolderCreator<T>.setTextColor(id: Int, color: Int) = apply {
     val view: TextView = findViewById(id)
@@ -100,16 +110,16 @@ fun <T> ViewHolderCreator<T>.setTextSize(id: Int, sp: Int) = apply {
 }
 
 fun <T> ViewHolderCreator<T>.clicked(id: Int, listener: View.OnClickListener?) =
-        apply { findViewById<View>(id).setOnClickListener(listener) }
+    apply { findViewById<View>(id).setOnClickListener(listener) }
 
 fun <T> ViewHolderCreator<T>.itemClicked(listener: View.OnClickListener?) =
-        apply { itemView?.setOnClickListener(listener) }
+    apply { viewHolder?.itemView?.setOnClickListener(listener) }
 
 fun <T> ViewHolderCreator<T>.longClicked(id: Int, listener: OnLongClickListener?) =
-        apply { findViewById<View>(id).setOnLongClickListener(listener) }
+    apply { findViewById<View>(id).setOnLongClickListener(listener) }
 
 fun <T> ViewHolderCreator<T>.isEnabled(id: Int, enable: Boolean = true) =
-        apply { findViewById<View>(id).isEnabled = enable }
+    apply { findViewById<View>(id).isEnabled = enable }
 
 fun <T> ViewHolderCreator<T>.addView(id: Int, vararg views: View?) = apply {
     val viewGroup: ViewGroup = findViewById(id)
@@ -119,10 +129,10 @@ fun <T> ViewHolderCreator<T>.addView(id: Int, vararg views: View?) = apply {
 }
 
 fun <T> ViewHolderCreator<T>.addView(id: Int, view: View?, params: ViewGroup.LayoutParams?) =
-        apply {
-            val viewGroup: ViewGroup = findViewById(id)
-            viewGroup.addView(view, params)
-        }
+    apply {
+        val viewGroup: ViewGroup = findViewById(id)
+        viewGroup.addView(view, params)
+    }
 
 fun <T> ViewHolderCreator<T>.removeAllViews(id: Int) = apply {
     val viewGroup: ViewGroup = findViewById(id)