I am a beginner and try to add a search widget and function to my app

I want to add a search widget and function to my app... The application includes a listview in a listfragment. I go through the android developer training and try to transfer the example code into my source code.. I add the searchview into my actionbar so far but without any functionality.. The next step in the android developer help is to create a searchable functionality, but I dont understand how to adapt that to my existing code.. I dont know where and how I can create a searchable Activity. My aim is to type any letter or word in my searchview and so, the listview get filtered. But I dont know what I have to do and especially where in my Code I have to add the example android developers code. please help..

This is my listfragment, where the listview should be filtered with the searchview..

import android.os.Bundle;
import android.widget.EditText;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class ListFragment extends Fragment {

    ListFragmentData mData;
    ListFragmentGUI mGUI;
    ListFragmentApplicationLogic mAppLogic;
    ListFragmentEventToListenerMapping mEventToListenerMapping;
    EditText inputSearch;

    public ListFragment () {

    }


    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        View mView = inflater.inflate(R.layout.list_fragment, container, false);
        initData();
        initGUI(mView);
        initApplicationLogic();
        initEventToListenerMapping();
        return mView;
    }


    private void initData() {
        mData = new ListFragmentData(this);
    }

    private void initGUI(View mView) {
        mGUI = new ListFragmentGUI(mView, mData);
    }

    private void initApplicationLogic() {
        mAppLogic = new ListFragmentApplicationLogic(mData, mGUI);
    }



    private void initEventToListenerMapping() {
        mEventToListenerMapping = new ListFragmentEventToListenerMapping(mGUI, mAppLogic);
    }



} 

This is my activity main:

import android.app.SearchManager;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.SearchView;

public class ActivityMain extends FragmentActivity {

    private ActivityMainGUI mGUI;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initData();
        initGUI();
        initApplicationLogic();
        initEventToListenerMapping();
        getActionBar().setHomeButtonEnabled(true);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.options_menu, menu);

        SearchManager searchManager =
                (SearchManager) getSystemService(Context.SEARCH_SERVICE);
         SearchView searchView =
                 (SearchView) menu.findItem(R.id.search).getActionView();
         searchView.setSearchableInfo(
                 searchManager.getSearchableInfo(getComponentName()));

         return true;



    }



    private void initData () {

    }

    public boolean onOptionsItemSelected(MenuItem item) { //Zurück Button
        if (android.R.id.home == item.getItemId()){
            finish();
        }
        return super.onOptionsItemSelected(item);   
    }

    private void initGUI () {
        setContentView(R.layout.activity_main);
        mGUI = new ActivityMainGUI(this);
        mGUI.getViewPager().setAdapter(new MyAdapter (getSupportFragmentManager()));
    }

    private void initApplicationLogic () {

    }

    private void initEventToListenerMapping () {
        new ActivityMainEventToListenerMapping(mGUI);
    }
}

... and my manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://ift.tt/nIICcg"
    package="de.fhdw.bfwi412a.geopfad"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="16"
        android:targetSdkVersion="16" />

    <permission 
        android:name="de.fhdw.bfwi412a.geopfad.permission.MAPS_RECEIVE"
        android:protectionLevel="signature"/>

    <uses-permission android:name="de.fhdw.bfwi412a.geopfad.permission.MAPS_RECEIVE"/>
     <!-- Permissions for Maps Integration -->
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>

      <!-- My Location -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

     <!-- Maps Integration -->
    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <!-- Google Play Services -->
        <meta-data android:name="com.google.android.gms.version"
           android:value="@integer/google_play_services_version" />

        <!-- Google API Key -->
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyBvr424W8t4IhaSwcaG3vao2vMiNFsS_hI"/>

        <activity
            android:name=".ActivityMain"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        <meta-data android:name="android.app.searchable"
            android:resource="@xml/searchable" />

        </activity>
        <activity
            android:name=".ActivityLocations"
            android:parentActivityName="de.fhdw.bfwi412a.geopfad.ActivityMain" >
        </activity>
    </application>

</manifest>

Please let me know if you need any other code to understand my problem or can give any help. Thak u guys!