简单, 快捷, 好用的 RecyclerView 适配器.
功能
- 无需继承 Adapter, 无需通过 position 判断 item 类型.
- 支持页头和页脚.
- 支持自动展示空数据界面.
- 通过 Kotlin 的 lambda 大量缩减代码.
添加依赖
[
implementation "com.dengzii.adapter:$latestVersion"
通过 lambda 快速使用
adapter.setEnableEmptyView(true, SuperAdapter.Empty())
adapter.addViewHolderForType<SuperAdapter.Empty>(R.layout.item_empty){
onBindData { _, _ ->
findView<View>(R.id.bt_refresh).setOnClickListener {
// refresh your data
}
}
}
adapter.setHeader("This is header", R.layout.item_header) {
onBindData { data, _ ->
findView<TextView>(R.id.tv_title).text = data
}
}
adapter.setFooter(listOf("This", "is", "footer"), R.layout.item_section) {
onBindData { data, _ ->
findView<TextView>(R.id.tv_title).text = data.joinToString(" ")
}
}
adapter.addViewHolderForType<Header>(R.layout.item_header) {
val title = findView<TextView>(R.id.tv_title)
val content by lazyFindView<TextView>(R.id.tv_content)
onBindData { data, _ ->
title.text = data.title
content.text = data.content
}
}或者不使用 lambda
val adapter = SuperAdapter(listOf("Item 1", "Item 2", "Item 3"))
adapter.addViewHolderForType(String::class.java, ItemViewHolder::class.java)
recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.adapter = adapter
class ItemViewHolder(parent: ViewGroup) : AbsViewHolder<String>(parent) {
private lateinit var mTextView:TextView
override fun onCreate(parent: ViewGroup) {
mTextView = TextView(context)
mTextView.layoutParams = getLayoutParam(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT
)
setContentView(mTextView)
}
override fun onBindData(data: String, position: Int) {
mTextView.text = data
}
}无需继承 SuperAdapter, 但需要为每种 Item 实现并继承继承抽象类 AbsViewHolder, 并在改类中设置布局和绑定 View, 数据.
AbsViewHolder 代表一种 Item 类型, 其中泛型 T 为该 Item 对应的实体类
Adapter 构造器
public SuperAdapter(List<Object> data)
绑定 ViewHolder 到实体类型
public void addViewHolderForType(Class<?> type, Class<? extends AbsViewHolder> holder)
设置 Item 点击事件
public void setOnItemClickListener(OnItemClickListener listener)
public interface OnItemClickListener{
void onItemClick(View v, Object itemData, int position);
}
构造器, 必须重写带参数构造器, 否则无法使用, parent 与 Adapter#onCreateViewHolder 中 parent 一致
public AbsViewHolder(@NonNull ViewGroup parent)
创建 Item 时调用 onCreate 方法, 其中 parent 是该 item 的容器布局
public abstract void onCreate(@NonNull ViewGroup parent);
绑定数据
public abstract void onBindData(@NonNull T data, int position);
设置 Adapter
var data:List<Any>
...
val adapter = SuperAdapter(data)
// 绑定数据类到 ViewHolder
adapter.addViewHolderForType(Item::class.java, ItemViewHolder::class.java)
adapter.addViewHolderForType(Header::class.java, HeaderViewHolder::class.java)
adapter.addViewHolderForType(Section::class.java, SectionViewHolder::class.java)
adapter.setOnItemClickListener(object : SuperAdapter.OnItemClickListener {
override fun onItemClick(v: View?, itemData: Any?, position: Int) {
}
})
recyclerView.layoutManager = LinearLayoutManager(this)
recyclerView.adapter = adapter
继承 AbsViewHolder
class ItemViewHolder(parent: ViewGroup) : AbsViewHolder<Item>(parent) {
private lateinit var mTvTitle: TextView
private lateinit var mTvContent: TextView
private lateinit var mIvImage:ImageView
override fun onCreate(parent: ViewGroup) {
setContentView(R.layout.item_item)
mTvTitle = findViewById(R.id.tv_title)
mTvContent = findViewById(R.id.tv_content)
mIvImage = findViewById(R.id.iv_img)
}
override fun onBindData(data: Item, position: Int) {
mTvTitle.text = data.title
mTvContent.text = data.content
mIvImage.setImageResource(data.img)
}
}
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