[英]How to pass ArrayList<my_custom_class> to an other activity?
[英]Why won't `parcelize` pass data between my custom recycler adapter class and my custom activity class?
我正在嘗試使用parcelize
將自定義類實例從我的自定義回收器適配器類傳遞到自定義活動類,但並非所有自定義類屬性都被正確傳遞。 未傳遞的實例化類屬性是在主自定義類之外定義的另一個自定義類的實例化的屬性。 當我嘗試從第二個自定義類讀取值時,我得到null
這是我的自定義類:
package com.riverstonetech.gositeuk.Model
import android.os.Parcelable
import kotlinx.android.parcel.Parcelize
@Parcelize
data class Site(var name: String? = null): Parcelable {
var address: Address = Address("")
var description: String? = null
var locationCoordinate: Coordinate = Coordinate(0.0)
var distance: Int? = null
var price: Double? = null
}
package com.riverstonetech.gositeuk.Model
import android.os.Parcelable
import kotlinx.android.parcel.Parcelize
@Parcelize
data class Address(var line1: String? = null): Parcelable {
var line2: String? = null
var line3: String? = null
var line4: String? = null
var postcode: String? = null
var phoneNumber: String? = null
var siteURL: String? = null
}
package com.riverstonetech.gositeuk.Model
import android.os.Parcelable
import kotlinx.android.parcel.Parcelize
@Parcelize
data class Coordinate(var Latitude: Double? = null): Parcelable {
var Longitude: Double? = null
}
這是我的自定義回收器適配器類:
package com.riverstonetech.gositeuk
import android.content.Intent
import android.content.res.Resources
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.TextView
import androidx.core.content.ContextCompat.startActivity
import androidx.recyclerview.widget.RecyclerView
import java.text.DecimalFormat
class SiteAdapter(
private val mainActivity: CountiesActivity,
private val siteList: List<Site>) : RecyclerView.Adapter<SiteAdapter.ListItemHolder>() {
inner class ListItemHolder(val view: View):
RecyclerView.ViewHolder(view),
View.OnClickListener {
internal var name = view.findViewById<View>(R.id.textViewSiteName) as TextView
internal var distance = view.findViewById<View>(R.id.textViewSiteDistance) as TextView
internal var price = view.findViewById<View>(R.id.textViewSitePrice) as TextView
init {
view.isClickable = true
view.setOnClickListener(this)
}
override fun onClick(view: View) {
// mainActivity.showDetails(adapterPosition)
val intent = Intent(mainActivity, Details::class.java)
intent.putExtra("SELECTED_SITE", siteList[adapterPosition])
startActivity(mainActivity, intent, null)
}
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ListItemHolder {
val itemView = LayoutInflater.from(parent.context)
.inflate(R.layout.recycler_list_item, parent, false)
return ListItemHolder(itemView)
}
override fun getItemCount(): Int {
if (siteList != null) {
return siteList.size
}
// error
return -1
}
override fun onBindViewHolder(holder: ListItemHolder, position: Int) {
val site = siteList[position]
holder.name.text = site.name
holder.distance.text = site.distance.toString() + holder.view.context.getString(R.string.miles)
val decimalFormatter = DecimalFormat("#,##0")
holder.price.text = holder.view.context.getString(R.string.poundSign) + decimalFormatter.format(site.price).toString()
}
}
這是我的自定義活動類:
package com.riverstonetech.gositeuk
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import kotlinx.android.synthetic.main.activity_details.*
class Details : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_details)
val site = intent.getParcelableExtra<Site>("SELECTED_SITE")
Log.i("Info", "${site.name}")
siteNameTextView.text = site.name
Log.i("line 1", "${site.address.line1}")
}
}
在您使用的每個類Site
類需要有@Parcelize
注釋過,並實現Parcelable
。 因此,您還需要將其添加到Address
和Coordinate
。
將我所有的屬性聲明移動到我的 3 個自定義類的主要構造函數中。
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