Adding SQLite database value to ListView

I want to add SQLite database value to ListView if record exists, but I'm only getting text from EditText.

Here's what I'm doing

Code from databaseHelper Class

public String ifExistIn(String stationName) {

    String query = "SELECT stationName FROM review WHERE stationId='" + stationName + "' LIMIT 1";
    try {
        SQLiteDatabase database = getReadableDatabase();
        Cursor c = database.rawQuery(query, null));
        return stationName;
    }
}

Code from activity class

public View.OnClickListener searchStation = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        DatabaseHelper dbHelper = new DatabaseHelper(getApplicationContext());
        String searchString= searchText.getText().toString();
        dbHelper.ifExistIn(searchString);

        list.add(searchString);
        arrayAdapter= new ArrayAdapter<String>(SearchAndReview.this, android.R.layout.simple_list_item_1, list);

        listView.setAdapter(arrayAdapter);
    }
};