在Kotlin的Recycleview

问题描述 投票:0回答:2

我有一个问题:

RecyclerView:没有连接适配器;跳过布局

我无法在OnCreate中定义适配器,因为列表尚未就绪。

我如何在OnCreate中定义适配器?或者什么是解决我的问题的可能解决方案?

android kotlin android-recyclerview
2个回答
0
投票

在onCreate我做了:

  adapter = MyAdapter(this@MyActivity)
  adapter.data = ArrayList()

然后我才设置adapter.date = xxx

在我的适配器中我有:

class MyAdapter(val activity: MyActivity) :
        RecyclerView.Adapter<MyAdapter.BodyViewHolder>() {

    var data: MutableList<MyModel>? = null
        set(value) {
            field = value
            notifyDataSetChanged()
        }

    override fun getItemCount() = data?.size ?: 0

    fun ViewGroup.inflate(@LayoutRes layoutRes: Int, attachToRoot: Boolean = false): View {
        return LayoutInflater.from(context).inflate(layoutRes, this, attachToRoot)
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BodyViewHolder {
        val view = LayoutInflater.from(parent.context)
                .inflate(R.layout.my_layout, parent, false)
        return BodyViewHolder(view)
    }

    override fun onBindViewHolder(holder: BodyViewHolder, position: Int) {
        holder.bindValue(data?.get(position), activity)
    }

    class BodyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        fun bindValue(record: MyModel?, activity: MyActivity) {
            record?.let {
                itemView.mTextView.text = ....
            }
        }
    } 
}

值得一提的是,我的回收站视图的高度是wrap_content

 <android.support.v7.widget.RecyclerView
            android:id="@+id/mRecyclerView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

0
投票

如果你没有onCreate的数据,那就完全没问题了。您需要做的是定义适配器并将其与RecyclerView绑定。准备好数据后,将数据添加到adapter中的列表并通知它。示例如下

class MyAdapter: RecyclerView.Adapter<MyViewHolder>() {
    private val data = mutableListOf<MyModel>()

    override fun getItemCount() = data.count()

    fun addData(data : MyModel) {
        // add single data the list or call addAll() to add a group of data. 
        // just remember not to replace the variable
    }

    fun clearData() {

    }

    fun deleteData(id: Int) {

    }
}
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