基于kotlin的,DataBinding+Recycleview,并实现item的子控件的点击事件
核心代码如下:Activity
class MainActivity : AppCompatActivity() {
val studentInfo: Student? = null
lateinit var binding: ActivityMainBinding
lateinit var recyclerView: RecyclerView
var users: MutableList = mutableListOf()
lateinit var user: User
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
//binding.user = User("Test","User")
//val binding: ActivityMainBinding = ActivityMainBinding.inflate(getLayoutInflater())
val studentInfo = Student()
studentInfo.name.set("我叫朝阳杨大爷")
studentInfo.age.set(20)
binding.studentInfo = studentInfo
binding.eventListener = EventListener()
recyclerView = binding.rvContent
recyclerView.layoutManager = LinearLayoutManager(this)for (i in 0 until 30) {
user = User(null,null)
user.firstName = "我是$i"
user.lastName = "他是$i"
users.add(user)
//User("我是$i", "他是$i")
}
val adapter = users?.let { FruitAdapter(it, BR.user) }
recyclerView.adapter = adapter
//binding.setClick { toast("点击了我") }
//binding.tvStudenname.setOnClickListener { studentInfo.name.set("我还是叫叫朝阳杨大爷") }
//binding.tvAge.setOnClickListener {studentInfo.age.set(18)}
//val map = ObservableArrayMap()
//map["name"]= "我叫杨大爷"
//map["age"] = 20
//binding.studentInfo = map}inner class EventListener {fun onClick(view: View) {
binding.studentInfo!!.name.set("我叫不是你大爷")
binding.studentInfo!!.age.set(200)
//studentInfo.age.set(200)
Toast.makeText(this@MainActivity, "点击了并刷新worker对象的值", Toast.LENGTH_LONG).show()
}fun btnClick(view: View) {
view.id
Toast.makeText(this@MainActivity, "监听器方式", Toast.LENGTH_LONG).show()
}
//fun onTextChanged(charSequence :CharSequence ,i:Int, i1:Int , i2:Int ){
//binding.studentInfo!!.age.set(300)
//
//}fun onLongClick(view: View): Boolean {
Toast.makeText(this@MainActivity, "长按了", Toast.LENGTH_LONG).show()
return false
}
}}
Adapter:
class FruitAdapter (itemList: List, brId: Int) : BaseAdapter(itemList, brId) {
var onItemClickListener: AdapterView.OnItemClickListener? = nulloverride fun getLayoutId(): Int {
return R.layout.fruit_item //item对应的layoutId
}override fun onBindViewHolder(holder: ViewHolder, position: Int) {
super.onBindViewHolder(holder, position)
holder.binding.tvAges.setOnClickListener { mContext!!.toast("我被点了,我是第${position}个") }}override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return super.onCreateViewHolder(parent, viewType)}}BaseAdapter://两个泛型,T代表item的model类型即itemList的bean类型,TBinding代表itemLayout对应生成的XXXBinding类,比如itemLayout是fruit_item.xml,对应的就是FruitItemBinding
//两个参数itemList对应具体要显示的arrayList,brId则对应itemLayout里相应variable的变量名,比如variable的name是fruit,brId就是BR.fruit
abstract class BaseAdapter(private val itemList: List,
private val brId: Int) : RecyclerView.Adapter.ViewHolder>() {protected var mContext: Context? = nullinner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {//相当于itemView
lateinit var binding: TBinding
}override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
if (mContext == null) {
mContext = parent.context
}
//因为TBinding的具体类型不确定,这里只能用DataBindingUtil.inflate(),而不能用XXXBinding.inflate()
val binding: TBinding = DataBindingUtil.inflate(LayoutInflater.from(mContext), getLayoutId(), parent, false)
val holder = ViewHolder(binding.root)
holder.binding = binding
return holder
}override fun onBindViewHolder(holder: ViewHolder, position: Int) {
holder.binding.setVariable(brId, itemList[position])
//立即执行绑定,在对view变化时效敏感的地方常用,不加这句有可能出现itemView更新滞后、闪烁等问题
holder.binding.executePendingBindings()
}override fun getItemCount(): Int {
return itemList.size
}
//获取具体子adapter对应的itemLayoutId
abstract fun getLayoutId(): Int}
【基于kotlin的,DataBinding+Recycleview,并实现item的子控件的点击事件】Activity对象的Xml:
Adapter对应的xml:
源码如下:
https://download.csdn.net/download/u013075460/12484252
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