android - getActivity() / context in a ViewHolder in Kotlin Andorid -


i'm building viewholder , adapter fragment , when try make onclick viewholder, none of contexts pass in work. there no activity getactivity() can use, , p0!!.context nor itemview.context work either. should getting context from, , how reference it? thank you!

package com._________.criminalintent  import android.os.bundle import android.support.v4.app.fragment import android.support.v7.widget.linearlayoutmanager import android.support.v7.widget.recyclerview import android.view.layoutinflater import android.view.view import android.view.viewgroup import android.widget.textview import android.widget.toast  class crimelistfragment: fragment() {     private var mcrimerecyclerview: recyclerview? = null     private var madapter: crimeadapter? = null      override fun oncreateview(inflater: layoutinflater?, container: viewgroup?, savedinstancestate: bundle?): view? {     // fragment_crime_list.xml has recyclerview element = crime_recycler_view     // inflate fragment activity         val view = inflater!!.inflate(r.layout.fragment_crime_list, container, false)          // grab recyclerview , give required layoutmanager         mcrimerecyclerview = view.findviewbyid(r.id.crime_recycler_view)         mcrimerecyclerview!!.layoutmanager = linearlayoutmanager(activity)         updateui()         return view     }      private fun updateui() {         val crimelab = crimelab.get(activity)         val crimes = crimelab.getcrimes()         madapter = crimeadapter(crimes)         // connect adapter recyclerview         mcrimerecyclerview!!.adapter = madapter     }      /**      * in kotlin, must give view passed constructor directly      * substitute super() call      *      * create viewholder holders crime list item's view      *      * super(itemview) = super(inflater!!.inflate(r.layout.list_item_crime, parent, false))      * must give direct value in kotlin      */     private class crimeholder(inflater: layoutinflater?, parent: viewgroup):         recyclerview.viewholder(inflater!!.inflate(r.layout.list_item_crime, parent, false)),         view.onclicklistener {          private var mcrime: crime? = null          /**          * when given crime, crimeholder update title , date crime          */         fun bind(crime: crime) {            mcrime = crime             val titletextview = itemview.findviewbyid<textview>(r.id.crime_title)             val datetextview = itemview.findviewbyid<textview>(r.id.crime_date)             titletextview.text = mcrime!!.mtitle             datetextview.text = mcrime!!.mdate.tostring()         }          override fun onclick(p0: view?) {              toast.maketext(what_to_put_here, "${mcrime!!.mtitle} clicked!", toast.length_short / 2)                 .show()     } }       private class crimeadapter(private var mcrimes: mutablelist<crime>):         recyclerview.adapter<crimeholder>() {          /**          * - calls our crimeholder make our custom viewholders          * - called recyclerview when needs new view display          * - gets layoutinflater viewgroup , returns crimeholder of          */         override fun oncreateviewholder(parent: viewgroup?, viewtype: int): crimeholder         = crimeholder(layoutinflater.from(parent!!.context), parent)           /**          * bind crime (data) crimeholder          */         override fun onbindviewholder(holder: crimeholder?, position: int) {             holder!!.bind(mcrimes[position])         }          /**          * sees how many items in recyclerview need shown          */         override fun getitemcount(): int = mcrimes.size     } }

in implementation can safely use context view provided onclicklistener

override fun onclick(p0: view) {           toast.maketext(p0.context, "${mcrime!!.mtitle} clicked!", toast.length_short / 2)                 .show()     }

just remember set onclick:

fun bind(crime: crime) {            mcrime = crime             val titletextview = itemview.findviewbyid<textview>(r.id.crime_title)             val datetextview = itemview.findviewbyid<textview>(r.id.crime_date)             titletextview.text = mcrime!!.mtitle             datetextview.text = mcrime!!.mdate.tostring()             itemview.setonclicklistener(this) }

moreover kotlin classes nested (static) default. private class crimeholder equivalent private static class crimeholder in java. that's why don't have access getactivity() within crimeholder


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