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[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?
我正在尝试使用parcelize
将自定义类实例从我的自定义回收器适配器类传递到自定义活动类,但并非所有自定义类属性都被正确传递。 未传递的实例化类属性是在主自定义类之外定义的另一个自定义类的实例化的属性。 当我尝试从第二个自定义类读取值时,我得到null
这是我的自定义类:
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
}
这是我的自定义回收器适配器类:
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()
}
}
这是我的自定义活动类:
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}")
}
}
在您使用的每个类Site
类需要有@Parcelize
注释过,并实现Parcelable
。 因此,您还需要将其添加到Address
和Coordinate
。
将我所有的属性声明移动到我的 3 个自定义类的主要构造函数中。
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