如何使用 Kotlin 中的“getString()”从 Recycler Adapter 类访问“strings.xml”中的字符串

Question

我需要strings.xml从自定义 Recycler Adapter 类访问字符串，但我收到了如上所述的错误消息。这是我的 Kotlin Recycler Adapter 类，其中包含我尝试使用占位符和onBindViewHolder()访问字符串的方法：milespoundSign

\n\n

import android.content.res.Resources\nimport android.provider.Settings.Global.getString\nimport android.view.LayoutInflater\nimport android.view.View\nimport android.view.ViewGroup\nimport android.widget.TextView\nimport androidx.recyclerview.widget.RecyclerView\nimport java.text.DecimalFormat\n\nclass SiteAdapter(\n    private val mainActivity: CountiesActivity,\n    private val siteList: List<Site>) : RecyclerView.Adapter<SiteAdapter.ListItemHolder>() {\n\n    inner class ListItemHolder(view: View):\n        RecyclerView.ViewHolder(view),\n        View.OnClickListener {\n\n        internal var name = view.findViewById<View>(R.id.textViewSiteName) as TextView\n\n        internal var distance = view.findViewById<View>(R.id.textViewSiteDistance) as TextView\n\n        internal var price = view.findViewById<View>(R.id.textViewSitePrice) as TextView\n\n        init {\n\n            view.isClickable = true\n            view.setOnClickListener(this)\n\n        }\n\n        override fun onClick(view: View) {\n\n            mainActivity.showDetails(adapterPosition)\n\n        }\n\n    }\n\n    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ListItemHolder {\n\n        val itemView = LayoutInflater.from(parent.context)\n            .inflate(R.layout.recycler_list_item, parent, false)\n\n        return ListItemHolder(itemView)\n\n    }\n\n    override fun getItemCount(): Int {\n\n        if (siteList != null) {\n            return siteList.size\n        }\n        // error\n        return -1\n\n    }\n\n    override fun onBindViewHolder(holder: ListItemHolder, position: Int) {\n\n        val site = siteList[position]\n\n        holder.name.text = site.name\n        holder.distance.text = site.distance.toString() + Resources.getSystem().getString(R.string.miles)\n        val decimalFormatter = DecimalFormat("#,###.00")\n        holder.price.text = Resources.getSystem().getString(R.string.poundSign) + decimalFormatter.format(site.price).toString()\n\n    }\n\n\n}\n

\n\n

这是我的strings.xml文件：

\n\n

<resources>\n    <string name="app_name">GoSiteUK</string>\n    <string name="title_england">England</string>\n    <string name="title_scotland">Scotland</string>\n    <string name="title_wales">Wales</string>\n    <string name="title_nireland">N.Ireland</string>\n    <string name="helpInstructions">\\n\\n\\n\\n\\n\\nSelect from the available countries at the bottom of the screen to display a list of\n        counties for that country. Then select a county for which you wish to see campsites, caravan sites or motorhome sites. Select\n    a particular site that you wish to travel to and you will be presented with more information about the site. Click on \\"Take Me\n    Here\\" and a map will be displayed with navigation instructions and route information to follow to take you to that selected\n    site.\\n\\nFor support contact:\\n\\nriverstonetechuk@gmail.com\\n</string>\n    <string name="help">Help</string>\n    <string name="title_counties">--- Counties ---</string>\n    <string name="title_regions">--- Regions ---</string>\n    <string name="title_areas">--- Areas ---</string>\n    <string name="title_districts">--- Districts ---</string>\n\n    <string name="name">Name:</string>\n    <string name="distance">Distance:</string>\n    <string name="price">Price:</string>\n    <string name="miles"> miles</string>\n    <string name="poundSign">\xc2\xa3</string>\n</resources>\n\n

\n\n

错误信息如下所示：

\n\n

-01-28 16:09:25.229 16740-16740/com.riverstonetech.gositeuk W/ResourceType: No known package when getting value for resource number 0x7f0f0049\n2020-01-28 16:09:25.230 16740-16740/com.riverstonetech.gositeuk D/AndroidRuntime: Shutting down VM\n2020-01-28 16:09:25.231 16740-16740/com.riverstonetech.gositeuk E/AndroidRuntime: FATAL EXCEPTION: main\n    Process: com.riverstonetech.gositeuk, PID: 16740\n    android.content.res.Resources$NotFoundException: String resource ID #0x7f0f0049\n        at android.content.res.Resources.getText(Resources.java:335)\n        at android.content.res.Resources.getString(Resources.java:381)\n

\n\n

任何解决这个问题的解决方案都非常感谢。

\n

Answer 1

我认为问题是由于访问造成的

Resources.getSystem()

我强烈建议不要这样做。

我这边的建议：将 ListItemHolder 中的视图设置为可访问字段，如下所示

inner class ListItemHolder(val view: View)

然后您可以通过该视图访问字符串资源：

holder.price.text = holder.view.context.getString(R.string.poundSign) + decimalFormatter.format(site.price).toString()