Невозможно вставить больше значений в listview в базе данных sqlite(android studio).

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Я пытаюсь вставить некоторые значения в базу данных SQLite в android.
Значения вставлялись раньше, теперь, когда я запускаю свое приложение, оно не показывает значения, которые я пытаюсь добавить.
Мое приложение имеет в основном функцию поиска в панели действий.
Основная деятельность прилагается ниже.

Что я уже пробовал:

package com.admin.search;
import android.annotation.TargetApi;
import android.app.SearchManager;
import android.content.Context;
import android.database.Cursor;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.SearchView;
import android.util.Log;
import android.view.Menu;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    private CustomAdapter customAdapter;
    ListView listView;
    Cursor cursor;
    StationRepo stationRepo ;
    private final static String TAG= MainActivity.class.getName().toString();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(com.admin.fyp.R.layout.activity_main);
        stationRepo = new StationRepo(this);


        cursor=stationRepo.getStudentList();
        customAdapter = new CustomAdapter(MainActivity.this,  cursor, 0);
        listView = (ListView) findViewById(com.admin.fyp.R.id.lstStudent);
        listView.setAdapter(customAdapter);

        if(cursor==null) insertDummy();
    }

    private void insertDummy(){
        Station station= new Station();


        station.stop ="Bus Stop: Youhana Abaad\nDistance: 5.0 Km";
        station.name="Ataari Saroba";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Bhatti Chowk\nDistance: 4.1 Km";
        station.name="Azaadi Chowk";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Katchery\nDistance: 1.9 Km";
        station.name="Bhatti Chowk";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Qaddafi Stadium\nDistance:0.8 km";
        station.name="Canal";
        stationRepo.insert(station);


        stationRepo = new StationRepo(this);

        station.stop ="Kamahan\nDistance: 2.1 Km";
        station.name="Chungi Amar Sidhu";
        stationRepo.insert(station);


        stationRepo = new StationRepo(this);

        station.stop ="MAO College\nDistance: 1.7 Km";
        station.name="Civil Secretariat";
        stationRepo.insert(station);


        stationRepo = new StationRepo(this);
        station.stop ="Bus Stop: Gajjumata\nDistance: 0.9 Km";
        station.name="Dulu Khurd";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Dullu Khurd\nDistance: 0.9 Km";
        station.name="Gajjumata";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Chungi Amar Sidhu\nDistance: 2.5 Km";
        station.name="Ghazi Chowk";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Canal\nDistance: 1.6 Km";
        station.name="Ichra";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Qainchi\nDistance: 6.0 Km";
        station.name="Itefaq Hospital";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Qartabah Chowk\nDistance: 2.0 Km";
        station.name="Janazgah";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Model Town\nDistance: 4.3 Km";
        station.name="Kalma Chowk";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Ataari Saroba\nDistance: 2.9 Km";
        station.name="Kamahan";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Civil Secretariat\nDistance: 0.9 Km";
        station.name="Katchery";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Janazgah\nDistance: 2.0 Km";
        station.name="MAO College";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Naseerahbad\nDistance: 3.7 Km";
        station.name="Model Town";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Itefaq Hospital\nDistance: 4.1 Km";
        station.name="Naseerahbad";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);
        station.stop ="Bus Stop: Timber Market\nDistance: 0.8 Km";
        station.name="Niazi Chowk";
        stationRepo.insert(station);


        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Kalma Chowk\nDistance: 3.0 Km";
        station.name="Qaddafi Stadium";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Ghazi Chowk\nDistance: 1.1 Km";
        station.name="Qainchi";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Shama\nDistance: 1.2 Km";
        station.name="Qartaba Chowk";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Niazi Chowk\nDistance: 1.9 Km";
        station.name="Shahdra";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Ichra\nDistance: 0.7 Km";
        station.name="Shama";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Azaadi Chowk\nDistance: 2.2 Km";
        station.name="Timber Market";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop ="Bus Stop: Dulu Khurd\nDistance: 0.9 Km";
        station.name="Youhana Abaad";
        stationRepo.insert(station);

        //Feeder Routes.
        stationRepo = new StationRepo(this);

        station.stop="Bus Stop: Bhatti Chowk\nDistance: 0.9 Km";
        station.name="Railway Station(FR-01)";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop="Bus Stop: Bhatti Chowk\nDistance: 0.9 Km";
        station.name="Samanabad Morr(FR-02)";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop="Bus Stop: Shahdara\nDistance: 0.9 Km";
        station.name="Railway Station(FR-03)";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop="Bus Stop: Chungi Amar Sidhu\nDistance: 0.9 Km";
        station.name="R.A Bazar(FR-04)";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop="Bus Stop: Bhatti Chowk\nDistance: 0.9 Km";
        station.name="Shadbagh Underpass(FR-05)";
        stationRepo.insert(station);

        stationRepo = new StationRepo(this);

        station.stop="Bus Stop: Raj Ghar Chowk\nDistance: 0.9 Km";
        station.name="Babu Sabu(FR-06)";
        stationRepo.insert(station);


    }

    @Override
    public void onResume(){
        super.onResume();

    }

    @Override
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(com.admin.fyp.R.menu.options_menu, menu);


        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
            SearchManager manager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
            SearchView search = (SearchView) menu.findItem(com.admin.fyp.R.id.search).getActionView();
            search.setSearchableInfo(manager.getSearchableInfo(getComponentName()));

            search.setOnQueryTextListener(new SearchView.OnQueryTextListener() {

                @Override
                public boolean onQueryTextSubmit(String s) {
                    Log.d(TAG, "onQueryTextSubmit ");
                    cursor=stationRepo.getStudentListByKeyword(s);
                    if (cursor==null){
                        Toast.makeText(MainActivity.this,"No records found!",Toast.LENGTH_LONG).show();
                    }else{
                        Toast.makeText(MainActivity.this, cursor.getCount() + " records found!",Toast.LENGTH_LONG).show();
                    }
                    customAdapter.swapCursor(cursor);

                    return false;
                }

                @Override
                public boolean onQueryTextChange(String s) {
                    Log.d(TAG, "onQueryTextChange ");
                    cursor=stationRepo.getStudentListByKeyword(s);
                    if (cursor!=null){
                        customAdapter.swapCursor(cursor);
                    }
                    return false;
                }

            });

        }

        return true;
    }
}

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