RecyclerView局部刷新 RecyclerView使用payload实现局部刷新
独沽一味的猪 人气:0想了解RecyclerView使用payload实现局部刷新的相关内容吗，独沽一味的猪在本文为您仔细讲解RecyclerView局部刷新的相关知识和一些Code实例，欢迎阅读和指正，我们先划重点：RecyclerView,payload局部刷新,RecyclerView局部刷新,RecyclerView刷新，下面大家一起来学习吧。
列表局部刷新：
01.notifyDataSetChanged() 刷新全部可见的item
02.notifyItemChanged(int position) 更新列表position位置上的数据可以调用
03.notifyItemInserted(int position) 列表position位置添加一条数据时可以调用，伴有动画效果
04.notifyItemRemoved(int position) 列表position位置移除一条数据时调用，伴有动画效果
05.notifyItemMoved(int fromPosition, int toPosition) 列表fromPosition位置的数据移到toPosition位置时调用，伴有动画效果
06.notifyItemRangeChanged(int positionStart, int itemCount) 列表从positionStart位置到itemCount数量的列表项进行数据刷新
07.notifyItemRangeInserted(int positionStart, int itemCount) 列表从positionStart位置到itemCount数量的列表项批量添加数据时调用，伴有动画效果
08.notifyItemRangeRemoved(int positionStart, int itemCount) 列表从positionStart位置到itemCount数量的列表项批量删除数据时调用，伴有动画效果
一、payload、notifyItemChanged()实现局部刷新：
1.在适配器中定义onBindViewHolder(holder: ViewHolder, position: Int, payloads: MutableList)方法：
class NewsAdapter : ListAdapter<Data, NewsAdapter.ViewHolder>(Diff()) {
//构建ListView的数据比较结果
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()进行局部刷新：
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)
//点击局部刷新
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>
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