Cannot use search in filter list view

I want to filter my list using search input. I have the 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 from onCreate method", Toast.LENGTH_LONG).show();

//       using searchview to display data in the 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 the onQueryTextChange application is terminated. Similar to the following method:

public boolean onQueryTextChange (String newText) {. Adapter.getFilter () filter (newText); return false; }

Please help me to solve this problem.

Edit 1: Logcat:

06-19 14: 40: 25.815 3259-3259 / com.example.shiza.dailyquranverses E / AndroidRuntime: FATAL EXCEPTION: main java.lang.NullPointerException at android.widget.ArrayAdapter.getCount (ArrayAdapter.java:330) on android. widget.AdapterView.checkFocus (AdapterView.java:700) on android.widget.AdapterView $ AdapterDataSetObserver.onInvalidated (AdapterView.java:823) at android.widget.AbsListView $ AdapterDataSetObserver.onInvalidated (AbsListView.djavaatabase600) .DataSetObservable.notifyInvalidated (DataSetObservable.java:47) at android.widget.BaseAdapter.notifyDataSetInvalidated (BaseAdapter.java:59) at android.widget.ArrayAdapter $ ArrayFilter.publishResults (ArrayAdapter.java:47) ResultsHandler.handleMessage (Filter.java:282) at android.os.Handler.dispatchMessage (Handler.java:99) at android.os.Looper.loop (Looper.java:137) at android.app.ActivityThread.main (ActivityThread.java:4424) in java. lang.reflect.Method.invokeNative (native method) at java.lang.reflect.Method.invoke (Method.java:511) at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:551) in dalvik.system.NativeStart.main (native method)reflect.Method.invoke (Method.java:511) at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java: 551) in dalvik.system.NativeStart.main (native method)reflect.Method.invoke (Method.java:511) at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:784) at com.android.internal.os.ZygoteInit.main (ZygoteInit.java: 551) in dalvik.system.NativeStart.main (native method)