增加bindWithPayloads

app/build.gradle

@@ -21,9 +21,12 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'androidx.appcompat:appcompat:1.1.0'
-    implementation 'androidx.recyclerview:recyclerview:1.1.0'
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'androidx.recyclerview:recyclerview:1.2.1'
     implementation project(":easy-adapter")
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation 'com.blankj:utilcodex:1.31.0'
+        implementation 'com.google.code.gson:gson:2.8.6'
+    implementation 'com.github.bumptech.glide:glide:4.12.0'
 }
 

app/src/main/AndroidManifest.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.lxj.easyadapter.sample">
-
+    <uses-permission android:name="android.permission.INTERNET"/>
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"

app/src/main/java/com/lxj/easyadapter/sample/MainActivity.kt

@@ -4,38 +4,94 @@ import android.graphics.Color
 import android.os.Bundle
 import android.view.View
 import android.view.ViewGroup
+import android.widget.ImageView
 import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.DiffUtil
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
+import com.blankj.utilcode.util.CloneUtils
+import com.blankj.utilcode.util.GsonUtils
+import com.bumptech.glide.Glide
+import com.bumptech.glide.load.engine.DiskCacheStrategy
+import com.bumptech.glide.load.resource.drawable.DrawableTransitionOptions
+import com.bumptech.glide.request.RequestOptions
+import com.google.gson.GsonBuilder
+import com.google.gson.reflect.TypeToken
 import com.lxj.easyadapter.*
 
 import kotlinx.android.synthetic.main.activity_main.*
+import java.lang.reflect.Type
 import java.util.*
 import java.util.concurrent.CopyOnWriteArrayList
+import com.bumptech.glide.request.transition.DrawableCrossFadeFactory
+
+
+
 
 class MainActivity : AppCompatActivity() {
 
     internal var userList: MutableList<User> = ArrayList()
     private var adapter: EasyAdapter<User>? = null
     private var multiItemTypeAdapter: MultiItemTypeAdapter<User>? = null
-
+    val url = "https://img1.baidu.com/it/u=1925715390,133119052&fm=253&fmt=auto&app=138&f=JPEG?w=400&h=400"
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        userList.add(User(name = "盛大"))
+        userList.add(User(name = "都是"))
+        userList.add(User(name = "CEAD"))
+        userList.add(User(name = "大图"))
+        add.setOnClickListener {
+            val old = deepCopy()
+            val range = (0 until userList.size)
+            userList.add(if(range.isEmpty()) 0 else range.random(), User(id = UUID.randomUUID().toString(), name = "随机添加 - ${(0..1000).random()}" ))
+            DiffUtil.calculateDiff(UserDiffCallback(old, userList)).dispatchUpdatesTo(recyclerView.adapter!!)
+        }
+        del.setOnClickListener {
+            if(userList.isNullOrEmpty()) return@setOnClickListener
+            val range = (0 until userList.size)
+            val old = deepCopy()
+            userList.removeAt(range.random())
+            DiffUtil.calculateDiff(UserDiffCallback(old, userList)).dispatchUpdatesTo(recyclerView.adapter!!)
+        }
+        update.setOnClickListener {
+            if(userList.isNullOrEmpty()) return@setOnClickListener
+            val index = (0 until userList.size).random()
+            val old = deepCopy()
+            userList[index].name += " - 随机更新"
+            DiffUtil.calculateDiff(UserDiffCallback(old, userList)).dispatchUpdatesTo(recyclerView.adapter!!)
+        }
+        replace.setOnClickListener {
+            if(userList.isNullOrEmpty()) return@setOnClickListener
+            val index = (0 until userList.size).random()
+            val old = deepCopy()
+            userList[index] = User(name = "我是随机替换的")
+            DiffUtil.calculateDiff(UserDiffCallback(old, userList)).dispatchUpdatesTo(recyclerView.adapter!!)
+        }
+        move.setOnClickListener {
+            if(userList.isNullOrEmpty()) return@setOnClickListener
+            val old = deepCopy()
+            userList.reverse()
+            DiffUtil.calculateDiff(UserDiffCallback(old, userList)).dispatchUpdatesTo(recyclerView.adapter!!)
+        }
         recyclerView.layoutManager = LinearLayoutManager(this)
-        recyclerView.itemAnimator = null
 
         //prepare data
-        for (i in 0..6) {
-            userList.add(User("本杰明 - $i", i * 2, i))
-        }
+//        for (i in 0..6) {
+//            userList.add(User("本杰明 - $i", i * 2, i))
+//        }
 
 //        testHeader()
         testMultiItem()
     }
 
+    fun deepCopy(): List<User>{
+        val json = GsonBuilder().create().toJson(userList)
+        return GsonBuilder().create().fromJson<List<User>>(json, object : TypeToken<List<User>>() {}.type)
+    }
+
     private fun testHeader() {
         adapter = object : EasyAdapter<User>(userList, R.layout.item) {
             override fun bind(holder: ViewHolder, user: User, position: Int) {
@@ -88,10 +144,10 @@ class MainActivity : AppCompatActivity() {
         multiItemTypeAdapter = MultiItemTypeAdapter<User>(userList)
                 .apply {
                     addItemDelegate(OneDelegate())
-                    addItemDelegate(TwoDelegate())
-                    addHeaderView(createView("Multi Header view1111"))
-                    addHeaderView(createView("Multi Header view22222"))
-                    addFootView(createView("Multi Footer view"))
+//                    addItemDelegate(TwoDelegate())
+//                    addHeaderView(createView("Multi Header view1111"))
+//                    addHeaderView(createView("Multi Header view22222"))
+//                    addFootView(createView("Multi Footer view"))
                     setOnItemClickListener(object : MultiItemTypeAdapter.OnItemClickListener {
                         override fun onItemClick(view: View, holder: RecyclerView.ViewHolder, position: Int) {
                             Toast.makeText(this@MainActivity, "position: $position", Toast.LENGTH_SHORT).show()
@@ -108,13 +164,35 @@ class MainActivity : AppCompatActivity() {
     internal inner class OneDelegate : ItemDelegate<User> {
 
         override fun isThisType(item: User, position: Int): Boolean {
-            return position % 2 != 0
+            return true
+//            return position % 2 != 0
         }
         override fun bind(holder: ViewHolder, user: User, position: Int) {
-            holder.setText(android.R.id.text1, "name: " + user.name + " - " + position)
+            holder.setText(R.id.name, user.name)
+            Glide.with(this@MainActivity)
+                .load(url).transition(DrawableTransitionOptions.withCrossFade(1000))
+                .diskCacheStrategy(DiskCacheStrategy.NONE)
+                .skipMemoryCache(true)
+                .placeholder(R.mipmap.ic_launcher_round)
+                .into(holder.getView<ImageView>(R.id.avatar))
+        }
+
+        //布局更新
+        override fun bindWithPayloads(
+            holder: ViewHolder,
+            t: User,
+            position: Int,
+            payloads: List<Any>
+        ) {
+            if(payloads.isNullOrEmpty()) return
+            val bundle = payloads[0] as Bundle
+            val name = bundle.getString("name") ?: ""
+            if(!name.isNullOrEmpty()){
+                holder.setText(R.id.name, name)
+            }
         }
 
-        override fun getLayoutId(): Int = android.R.layout.simple_list_item_1
+        override fun getLayoutId(): Int = R.layout.adapter_one
     }
 
     internal inner class TwoDelegate : ItemDelegate<User> {

app/src/main/java/com/lxj/easyadapter/sample/User.kt

@@ -1,4 +1,6 @@
 package com.lxj.easyadapter.sample
 
+import java.util.*
 
-data class User(var name: String = "", var age: Int = 0, var id: Int = 0)
+
+data class User(var name: String = "", var age: Int = 0, var id: String = UUID.randomUUID().toString())

app/src/main/java/com/lxj/easyadapter/sample/UserDiffCallback.kt

@@ -0,0 +1,29 @@
+package com.lxj.easyadapter.sample
+
+import android.os.Bundle
+import androidx.recyclerview.widget.DiffUtil
+
+class UserDiffCallback(var oldData: List<User>?, var newData: List<User>?) : DiffUtil.Callback() {
+    override fun getOldListSize() = oldData?.size ?: 0
+    override fun getNewListSize() = newData?.size ?: 0
+
+    override fun areItemsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+        if(oldData.isNullOrEmpty() || newData.isNullOrEmpty()) return false
+        return oldData!![oldItemPosition].id == newData!![newItemPosition].id
+    }
+
+    override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int): Boolean {
+       return oldData!![oldItemPosition].name == newData!![newItemPosition].name
+    }
+
+    //局部更新 areItemsTheSame为true && areContentsTheSame==false 调用
+    override fun getChangePayload(oldItemPosition: Int, newItemPosition: Int): Any? {
+        val oldItem = oldData!![oldItemPosition]
+        val newItem = newData!![newItemPosition]
+        val bundle = Bundle()
+        if(oldItem.name != newItem.name){
+            bundle.putString("name", newItem.name)
+        }
+        return bundle
+    }
+}

app/src/main/res/layout/activity_main.xml

@@ -5,11 +5,46 @@
     android:orientation="vertical">
 
 
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content">
+
+        <Button
+            android:id="@+id/add"
+            android:text="添加"
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"/>
+        <Button
+            android:id="@+id/del"
+            android:text="删除"
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"/>
+        <Button
+            android:id="@+id/update"
+            android:text="更新"
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"/>
+        <Button
+            android:id="@+id/replace"
+            android:text="替换"
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"/>
+        <Button
+            android:id="@+id/move"
+            android:text="移动"
+            android:layout_width="0dp"
+            android:layout_weight="1"
+            android:layout_height="wrap_content"/>
 
+    </LinearLayout>
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/recyclerView"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content"
+        android:layout_height="match_parent"
         android:splitMotionEvents="false" />
 </LinearLayout>
 

app/src/main/res/layout/adapter_one.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:orientation="horizontal"
+    android:padding="12dp"
+    android:gravity="center_vertical"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <ImageView
+        android:id="@+id/avatar"
+        android:layout_width="40dp"
+        android:layout_height="40dp"/>
+    <TextView
+        android:id="@+id/name"
+        android:layout_marginLeft="10dp"
+        android:textColor="#222222"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"/>
+</LinearLayout>

easy-adapter/src/main/java/com/lxj/easyadapter/ItemDelegate.kt

@@ -11,4 +11,9 @@ interface ItemDelegate<T> {
 
     fun bind(holder: ViewHolder, t: T, position: Int)
 
+    fun bindWithPayloads(holder: ViewHolder, t: T, position: Int, payloads: List<Any>) {
+        bind(holder, t, position)
+    }
+
+
 }

easy-adapter/src/main/java/com/lxj/easyadapter/ItemDelegateManager.kt

@@ -61,18 +61,22 @@ class ItemDelegateManager<T> {
                 "No ItemDelegate added that matches position=$position in data source")
     }
 
-    fun convert(holder: ViewHolder, item: T, position: Int) {
+    fun convert(holder: ViewHolder, item: T, position: Int, payloads: List<Any>? = null) {
         val delegatesCount = delegates.size()
         for (i in 0 until delegatesCount) {
             val delegate = delegates.valueAt(i)
 
             if (delegate.isThisType(item, position)) {
-                delegate.bind(holder, item, position)
+                if (payloads.isNullOrEmpty()){
+                    delegate.bind(holder, item, position)
+                }else{
+                    delegate.bindWithPayloads(holder, item, position, payloads)
+                }
                 return
             }
         }
-        throw IllegalArgumentException(
-                "No ItemDelegateManager added that matches position=$position in data source")
+//        throw IllegalArgumentException(
+//                "No ItemDelegateManager added that matches position=$position in data source")
     }
 
 

easy-adapter/src/main/java/com/lxj/easyadapter/MultiItemTypeAdapter.kt

@@ -53,8 +53,8 @@ open class MultiItemTypeAdapter<T>(var data: List<T>) : RecyclerView.Adapter<Vie
 
     fun onViewHolderCreated(holder: ViewHolder, itemView: View) { }
 
-    fun convert(holder: ViewHolder, t: T) {
-        mItemDelegateManager.convert(holder, t, holder.adapterPosition - headersCount)
+    fun convert(holder: ViewHolder, t: T, payloads: List<Any>? = null) {
+        mItemDelegateManager.convert(holder, t, holder.adapterPosition - headersCount, payloads)
     }
 
     protected fun isEnabled(viewType: Int): Boolean {
@@ -90,6 +90,16 @@ open class MultiItemTypeAdapter<T>(var data: List<T>) : RecyclerView.Adapter<Vie
         convert(holder, data[position - headersCount])
     }
 
+    override fun onBindViewHolder(holder: ViewHolder, position: Int, payloads: List<Any>) {
+        if (isHeaderViewPos(position)) {
+            return
+        }
+        if (isFooterViewPos(position)) {
+            return
+        }
+        convert(holder, data[position - headersCount], payloads)
+    }
+
     override fun onAttachedToRecyclerView(recyclerView: RecyclerView) {
         super.onAttachedToRecyclerView(recyclerView)
         WrapperUtils.onAttachedToRecyclerView(