android - Unable to use search view to filter list view -


i want filter listview using input in search view. have following code:

package com.example.shiza.dailyquranverses;  import android.os.asynctask; import android.os.bundle; import android.support.v7.app.actionbaractivity; import android.widget.searchview; import android.support.v7.widget.toolbar; import android.text.textutils; import android.view.view; import android.widget.arrayadapter; import android.widget.listview; import android.widget.toast;  import com.example.shiza.dailyquranverses.dailyquranmethods;  public class searchresultsactivity extends actionbaractivity implements searchview.onquerytextlistener{      toolbar toolbar;     listview listview;     searchview searchview;     arrayadapter<string> adapter;     dailyquranmethods dailyquranmethods = new dailyquranmethods();      @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_search_results);          toolbar = (toolbar) findviewbyid(r.id.app_bar_search_results);         toolbar.setlogo(r.mipmap.ic_launcher);         toolbar.settitle(" daily qura'n verses");         setsupportactionbar(toolbar);         toast.maketext(this, "hello oncreate method", toast.length_long).show();  //       using searchview display data in app          searchview = (searchview) findviewbyid(r.id.mysearchview);           listview = (listview) findviewbyid(r.id.listview);          adapter = new arrayadapter<string>(this, android.r.layout.simple_list_item_1, dailyquranmethods.getquranverses(this));          listview.setadapter(adapter);         searchview.setonquerytextlistener(this);      }      @override     public boolean onquerytextsubmit(string query) {         return false;     }      @override     public boolean onquerytextchange(string newtext) {         adapter.getfilter().filter(newtext);         return false;     } }

now onquerytextchange, application stopped. looks following method has issue:

public boolean onquerytextchange(string newtext) { adapter.getfilter().filter(newtext); return false; }

please me solve this.

edit 1: logcat :

06-19 14:40:25.815 3259-3259/com.example.shiza.dailyquranverses e/androidruntime﹕ fatal exception: main java.lang.nullpointerexception @ android.widget.arrayadapter.getcount(arrayadapter.java:330) @ android.widget.adapterview.checkfocus(adapterview.java:700) @ android.widget.adapterview$adapterdatasetobserver.oninvalidated(adapterview.java:823) @ android.widget.abslistview$adapterdatasetobserver.oninvalidated(abslistview.java:5600) @ android.database.datasetobservable.notifyinvalidated(datasetobservable.java:47) @ android.widget.baseadapter.notifydatasetinvalidated(baseadapter.java:59) @ android.widget.arrayadapter$arrayfilter.publishresults(arrayadapter.java:513) @ android.widget.filter$resultshandler.handlemessage(filter.java:282) @ android.os.handler.dispatchmessage(handler.java:99) @ android.os.looper.loop(looper.java:137) @ android.app.activitythread.main(activitythread.java:4424) @ java.lang.reflect.method.invokenative(native method) @ java.lang.reflect.method.invoke(method.java:511) @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:784) @ com.android.internal.os.zygoteinit.main(zygoteinit.java:551) @ dalvik.system.nativestart.main(native method)


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