create FTS table with pre-populated SQLite

I have a sqlite db and Copying the assets folder in the app. do a search query in the database is very slow. 300000-line database.

I want to copy the data to the virtual table(FTS3).Does the search queries will be faster?. How do I do?

my databasehelper.java

 public class DatabaseHelper extends SQLiteOpenHelper{

String DB_PATH =null;

private static String DB_NAME = "nedir";

private SQLiteDatabase myDataBase; 
private final Context myContext;

public DatabaseHelper(Context context) {

    super(context, DB_NAME, null, 1);
    this.myContext = context;
    DB_PATH="/data/data/"+context.getPackageName()+"/"+"databases/";
}   

public void createDataBase() throws IOException{

    boolean dbExist = checkDataBase();

    if(dbExist){
    }else{

        this.getReadableDatabase();

        try {

            copyDataBase();

        } catch (IOException e) {

            throw new Error("Veritabanı Kopyalanırken Bir hata İle Karşılaşıldı");

        }
    }

}

private boolean checkDataBase(){

    SQLiteDatabase checkDB = null;

    try{
        String myPath = DB_PATH + DB_NAME;
        checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);

    }catch(SQLiteException e){

    }

    if(checkDB != null){

        checkDB.close();

    }

    return checkDB != null ? true : false;
}

private void copyDataBase() throws IOException{

    //Open your local db as the input stream
    InputStream myInput = myContext.getAssets().open(DB_NAME);

    // Path to the just created empty db
    String outFileName = DB_PATH + DB_NAME;

    //Open the empty db as the output stream
    OutputStream myOutput = new FileOutputStream(outFileName);

    //transfer bytes from the inputfile to the outputfile
    byte[] buffer = new byte[1024];
    int length;
    while ((length = myInput.read(buffer))>0){
        myOutput.write(buffer, 0, length);
    }

    //Close the streams
    myOutput.flush();
    myOutput.close();
    myInput.close();

}

public void openDataBase() throws SQLException{

    //Open the database
    String myPath = DB_PATH + DB_NAME;
    //myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
    myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.CREATE_IF_NECESSARY);

}

@Override
public synchronized void close() {

        if(myDataBase != null)
            myDataBase.close();

        super.close();

}


@Override
public void onCreate(SQLiteDatabase db) {

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
} //return cursor}