Android 科特林的SectionedRecyclServiceAdapter

任何人都可以将java代码重构为kotlin代码

这是我的密码

FoodListAdapter.kt

class FoodListAdapter: StatelessSection(SectionParameters.builder()
    .itemResourceId(R.layout.content_food_list)
    .headerResourceId(R.layout.header_food_list)
    .build()) {

    val itemList = arrayListOf<Int>(1, 2, 3 ,4)

    override fun getContentItemsTotal(): Int {
        return itemList.size
    }

    override fun onBindItemViewHolder(holder: RecyclerView.ViewHolder?, position: Int) {
        val itemHolder = holder as MyItemViewHolder

        // bind your view here
        itemHolder.tvItem.setText(itemList[position])
    }

    override fun getItemViewHolder(view: View?): RecyclerView.ViewHolder {
        return MyItemViewHolder(view!!)
    }
}

class MyItemViewHolder(itemView: View): RecyclerView.ViewHolder(itemView) {
    lateinit var tvItem: TextView
    init {
        tvItem = itemView.findViewById(R.id.txtItem) as TextView
    }
}

我有个问题是 无法将“RecyclerView.adapter”类型的表达式“adapter”作为函数调用。找不到函数“invoke（）” 回收后查看适配器（节适配器） 有人请指导我修复这个。

---

抱歉，我英语不好

您正在尝试将类属性作为函数访问

在Java中，您可以将适配器设置为：

recyclerView.setAdapter(sectionAdapter)

在科特林，这看起来像：

recyclerView.adapter = sectionAdapter

查看更多信息

class FoodListAdapter(val itemList): StatelessSection(SectionParameters.builder()
    .itemResourceId(R.layout.content_food_list)
    .headerResourceId(R.layout.header_food_list)
    .build()) {

    override fun getContentItemsTotal(): Int {
        return itemList.size
    }

    override fun onBindItemViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        val itemHolder = holder as MyItemViewHolder
        itemHolder.tvItem.setText(itemList[position])
    }

    override fun getItemViewHolder(view: View?): RecyclerView.ViewHolder {
        return MyItemViewHolder(view!!)
    }
}

class MyItemViewHolder(itemView: View): RecyclerView.ViewHolder(itemView) {
    internal val tvItem: TextView =itemView.findViewById(R.id.txtItem)
}

对于您的活动，您不需要上下文变量activity extends context

class FoodActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_food_list)

    val sectionAdapter = SectionedRecyclerViewAdapter()

        val itemList = arrayListOf<Int>(1, 2, 3 ,4)
        sectionAdapter.addSection(FoodListAdapter(itemList))

        val recyclerView:RecyclerView = findViewById(R.id.foodList)
        recyclerView.layoutManager = LinearLayoutManager(context)
        recyclerView.adapter = sectionAdapter
    }
}

class FoodActivity:AppCompatActivity（）{
重写创建时的乐趣（savedInstanceState:Bundle？）{
super.onCreate（savedInstanceState）
setContentView（R.layout.activity\u food\u list）
val sectionAdapter=sectionedRecyclServiceAdapter（）
val itemList=arrayListOf（1,2,3,4）
sectionAdapter.addSection（FoodListAdapter（itemList））
val recyclerView:recyclerView=findviewbyd（R.id.foodList）
recyclerView.layoutManager=LinearLayoutManager（上下文）
recyclerView.adapter=节适配器
}
}

正如@CampbellMG提到的，您需要使用

recyclerView.adapter=sectionAdapter

或

recyclerView.setAdapter（sectionAdapter）

recyclerView.adapter=sectionAdapter

更为惯用

class FoodActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_food_list)

    val sectionAdapter = SectionedRecyclerViewAdapter()

        val itemList = arrayListOf<Int>(1, 2, 3 ,4)
        sectionAdapter.addSection(FoodListAdapter(itemList))

        val recyclerView:RecyclerView = findViewById(R.id.foodList)
        recyclerView.layoutManager = LinearLayoutManager(context)
        recyclerView.adapter = sectionAdapter
    }
}