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RecyclerView使用payload實(shí)現(xiàn)局部刷新

更新時(shí)間：2021年10月03日 16:28:19 作者：獨(dú)沽一味的豬

這篇文章主要為大家詳細(xì)介紹了RecyclerView使用payload實(shí)現(xiàn)局部刷新，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

本文實(shí)例為大家分享了RecyclerView使用payload實(shí)現(xiàn)局部刷新的具體代碼，供大家參考，具體內(nèi)容如下

列表局部刷新：

01.notifyDataSetChanged() 刷新全部可見(jiàn)的item
02.notifyItemChanged(int position) 更新列表position位置上的數(shù)據(jù)可以調(diào)用
03.notifyItemInserted(int position) 列表position位置添加一條數(shù)據(jù)時(shí)可以調(diào)用，伴有動(dòng)畫(huà)效果
04.notifyItemRemoved(int position) 列表position位置移除一條數(shù)據(jù)時(shí)調(diào)用，伴有動(dòng)畫(huà)效果
05.notifyItemMoved(int fromPosition, int toPosition) 列表fromPosition位置的數(shù)據(jù)移到toPosition位置時(shí)調(diào)用，伴有動(dòng)畫(huà)效果
06.notifyItemRangeChanged(int positionStart, int itemCount) 列表從positionStart位置到itemCount數(shù)量的列表項(xiàng)進(jìn)行數(shù)據(jù)刷新
07.notifyItemRangeInserted(int positionStart, int itemCount) 列表從positionStart位置到itemCount數(shù)量的列表項(xiàng)批量添加數(shù)據(jù)時(shí)調(diào)用，伴有動(dòng)畫(huà)效果
08.notifyItemRangeRemoved(int positionStart, int itemCount) 列表從positionStart位置到itemCount數(shù)量的列表項(xiàng)批量刪除數(shù)據(jù)時(shí)調(diào)用，伴有動(dòng)畫(huà)效果

一、payload、notifyItemChanged()實(shí)現(xiàn)局部刷新：

1.在適配器中定義onBindViewHolder(holder: ViewHolder, position: Int, payloads: MutableList)方法：

class NewsAdapter : ListAdapter<Data, NewsAdapter.ViewHolder>(Diff()) {

    //構(gòu)建ListView的數(shù)據(jù)比較結(jié)果
    class Diff : DiffUtil.ItemCallback<Data>() {
        override fun areItemsTheSame(oldItem: Data, newItem: Data): Boolean {
            return oldItem.hashId == newItem.hashId
        }

        override fun areContentsTheSame(oldItem: Data, newItem: Data): Boolean {
            return oldItem.content == newItem.content
        }
    }

    inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        val tvContent: TextView = view.findViewById(R.id.tvContent)
        var tvPlay: TextView = view.findViewById(R.id.tvPlay)
        var tvPlay1: TextView = view.findViewById(R.id.tvPlay1)
        var tvPlay2: TextView = view.findViewById(R.id.tvPlay2)
    }

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

    override fun onBindViewHolder(holder: ViewHolder, position: Int) {
        holder.tvContent.text = getItem(position).content
        holder.tvPlay.text = "播放"
        holder.tvPlay1.text = "播放"
        holder.tvPlay2.text = "播放"
    }

    //局部刷新Item
    override fun onBindViewHolder(holder: ViewHolder, position: Int, payloads: MutableList<Any>) {
        if(payloads.isEmpty()) {
            onBindViewHolder(holder, position)
        } else {
            for (i in 0 until payloads.size) {
                when(payloads[i].toString()) {
                    "aaa" -> {
                        holder.tvContent.text = "000"
                    }
                    "bbb" -> {
                        holder.tvPlay.text = "222"
                    }
                }
            }
        }
    }
}

2.使用notifyItemChanged()進(jìn)行局部刷新：

class MainActivity : AppCompatActivity() {

    private lateinit var recycler: RecyclerView
    private lateinit var mAdapter: NewsAdapter

    val data = listOf(
        Data("123", "123", 1, "123"),
        Data("456", "456", 1, "456"),
        Data("789", "789", 1, "789")
    )

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        recycler = findViewById(R.id.recycler)
        mAdapter = NewsAdapter()
        val layoutManager = LinearLayoutManager(this)
        recycler.layoutManager = layoutManager
        recycler.adapter = mAdapter
        mAdapter.submitList(data)
        //點(diǎn)擊局部刷新
        findViewById<Button>(R.id.btn).setOnClickListener {
            mAdapter.notifyItemChanged(2, "aaa")
            mAdapter.notifyItemChanged(0, "aaa")
            mAdapter.notifyItemChanged(1, "aaa")
            mAdapter.notifyItemChanged(2, "bbb")
            mAdapter.notifyItemChanged(0, "bbb")
            mAdapter.notifyItemChanged(1, "bbb")
        }

    }
}

3.MainActivity布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/btn"
        android:text="局部刷新"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>

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

</LinearLayout>

4.列表Item布局文件：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:background="@android:color/white">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:padding="8dp">

            <TextView
                android:id="@+id/tvContent"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:textColor="@android:color/black"
                android:textStyle="bold" />

            <TextView
                android:id="@+id/tvPlay"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="end"
                android:text="哈哈" />

            <TextView
                android:id="@+id/tvPlay1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="end"
                android:text="哈哈" />

            <TextView
                android:id="@+id/tvPlay2"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="end"
                android:text="哈哈" />

        </LinearLayout>

    </androidx.cardview.widget.CardView>

</RelativeLayout>

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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