基于kotlin的，DataBinding+Recycleview,并实现item的子控件的点击事件小技巧

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