java - Android Filter searchView Widget for scala " got ClassCastException" -

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i want create "searchview widget" android in scala plugin eclipse, here code,

 override def getfilter(): filter = {   new filter() {      protected override def publishresults(constraint: charsequence, results:  filterresults) {       var books = results.values.asinstanceof[list[bookmetadata]]       itemadapter.this.notifydatasetchanged()     }      protected override def performfiltering(constraint: charsequence): filterresults = {        val filteredresults = listbuffer(books.asscala.tolist.filter(b =>         b.tostring.startswith(constraint.tostring)): _*) .asinstanceof[list[bookmetadata]]       val results = new filterresults()       results.values = filteredresults       results     }   } }

i don't have error when run program have classcastexception

here log:

 08-23 13:37:06.986: v/bookfragment(25407): query : modern  08-23 13:37:06.996: w/filter(25407): exception occured during performfiltering()!  08-23 13:37:06.996: w/filter(25407): java.lang.classcastexception:   scala.collection.mutable.listbuffer cannot cast java.util.list 08-23 13:37:06.996: w/filter(25407):    @    com.bitlit.android.booksfragment$itemadapter$$anon$2. performfiltering(booksfragment.scala:138) 08-23 13:37:06.996: w/filter(25407):    @  android.widget.filter$requesthandler.handlemessage(filter.java:234)  08-23 13:37:06.996: w/filter(25407):    @    android.os.handler.dispatchmessage(handler.java:99)   08-23 13:37:06.996: w/filter(25407):  @ android.os.looper.loop(looper.java:137) 08-23 13:37:06.996: w/filter(25407):  @ android.os.handlerthread.run(handlerthread.java:61)

would please give me hints implementation

thanks in advance!

looking @ trace seems line causing issue one:

val filteredresults = listbuffer(books.asscala.tolist.filter(b =>     b.tostring.startswith(constraint.tostring)): _*) .asinstanceof[list[bookmetadata]]

you're doing this:

val filteredresults = listbuffer(meta1, meta2).asinstanceof[list[bookmetadata]]

so listbuffer[bookmetadata] not instance of list[bookmetadata]. case regardless of if mean java.util.list or scala immutable list.

you can this:

import collection.javaconverters._ val filteredresults = listbuffer(/* ... */).asjava // should return instance of java.util.list

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