如何解决如何在Kotlin中实现List <data class>子列表的可拆分的实现?
我想将数据类用于可包裹的其他活动。但是,当我想要使用variabel类型列表时,我就卡住了。我不知道如何实现,因为这是我第一次使用包裹式
这是我的POJO /模型
@Parcelize
data class HistoryTree(
val id: Int,val landOwner: String,val treeNumber: String,val membershipId: String,val speciesId: Int,val speciesName: String,val diameter: Double,val areaName: String,val woodProducts: List<HistoryProduct>) :Parcelable
@Parcelize
data class HistoryProduct(
val id: Int,val treeId: Int,val logStatus: Int,val orderId: Int,val logSequenceNumber: Int,val logNumber: String,val diameter: String,val length: String,val circumference: String,val logType: Int,val statusPecah: Int?,val lubangGerek: Int?,val pinhole: Int?,val belimbing: Int?,val createdBy: Int,val deleted: Int,val isTake: Int,val rejectStatusPetani: Int
) : Parcelable
这是我的活动
package com.sobi.penebangan.historylist
class HistoryListActivity : AppCompatActivity(),Coroutinescope {
private lateinit var job: Job
override val coroutineContext: CoroutineContext
get() = dispatchers.Main + job
@Inject
lateinit var viewmodelFactory: viewmodelProvider.Factory
private val vm: HistoryListviewmodel by lazy { viewmodelProviders.of(this,viewmodelFactory).get(HistoryListviewmodel::class.java) }
private var trees = mutablelistof<HistoryTree>()
private val treeAdapter = object : RecyclerView.Adapter<HistoryItemViewHolder>() {
override fun onCreateViewHolder(parent: ViewGroup,viewType: Int): HistoryItemViewHolder {
val ui = HistoryItemUi()
val view = ui.createView(AnkoContext.create(parent.context,parent))
return HistoryItemViewHolder(ui,view)
}
override fun getItemCount(): Int = trees.size
override fun onBindViewHolder(holder: HistoryItemViewHolder,position: Int) {
holder.bind(trees[position]) {
val product = it.woodProducts
val activity = Intent(this@HistoryListActivity,ProductHistoryListActivity::class.java)
activity.putExtra(ProductHistoryListActivity.paramTreeNumber,it.treeNumber)
activity.putExtra(ProductHistoryListActivity.paramHistoryData,it.woodProducts)
startActivity(activity)
}
}
}
我要使用变量woodProduct时出错,因为类型数据是列表
有人可以帮助我吗?
解决方法
在第一个活动中,向意图投射到ArrayList<out Parcelable>
例如:
intent.putParcelableArrayListExtra("arrayList",it.woodProducts as
ArrayList<out Parcelable>)
然后在第二个活动中,同时将数据投射到ArrayList
例如:
val list = intent.extras
val prodList: List<HistoryProduct> = list?.get("arrayList") as ArrayList<HistoryProduct>
,
尝试此解决方案。 首先在ProductHistoryListActivity中创建一个静态变量
companion object {
var list: MutableList<League> = arrayListOf()
}
然后,当您要初始化意图时,请在开始活动之前执行此操作
ProductHistoryListActivity.list = list
startActivity(activity)
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