问如何对SQLite表进行索引？

EN

public class DataBaseHelper extends SQLiteOpenHelper {
private static String DB_NAME = "database.sqlite";
private static String DB_PATH = "";
private SQLiteDatabase mydatabase;
private Context context;
public DataBaseHelper(Context context) {
    super(context, DB_NAME, null, 1);
    if (Build.VERSION.SDK_INT >= 15) {
        DB_PATH = context.getApplicationInfo().dataDir + "/databases/";
    } else {
        DB_PATH = Environment.getDataDirectory() + "/data/" + context.getPackageName() + "/databases/";
    }
    this.context = context;
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void checkAndCopyDatabase() {
    boolean dbExist = checkDatabases();
    if (dbExist) {
        Log.d("TAG", "already exist");
    } else {
        this.getReadableDatabase();
    }
    try {
        copyDatabases();
    } catch (IOException e) {
        e.printStackTrace();
        Log.d("TAG", "Error copy DataBase");
    }
}
public boolean checkDatabases() {
    SQLiteDatabase checkdb = null;
    try {
        String myPath = DB_PATH + DB_NAME;
        checkdb = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
    } catch (SQLException e) {
    }
    if (checkdb != null) {
        checkdb.close();
    }
    return checkdb != null ? true : false;
}
public void copyDatabases() throws IOException {
    InputStream myInput = context.getAssets().open(DB_NAME);
    String outFileName = DB_PATH + DB_NAME;
    OutputStream myOutput = new FileOutputStream(outFileName);
    byte[] buffer = new byte[2048];
    int lenght;
    while ((lenght = myInput.read(buffer)) > 0) {
        myOutput.write(buffer, 0, lenght);
    }
}
public void openDatabase() {
    String myPath = DB_PATH + DB_NAME;
    mydatabase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE);
}
public synchronized void close() {
    if (mydatabase != null) {
        mydatabase.close();
    }
    super.close();
}
public Cursor QueryData(String query) {
    return mydatabase.rawQuery(query, null);
}}

private void loadDatabase() {
    dataBaseHelper = new DataBaseHelper(getContext());
    try {
        dataBaseHelper.checkAndCopyDatabase();
        dataBaseHelper.openDatabase();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    try {
        cursor = dataBaseHelper.QueryData(" SELECT name FROM dictionary ");
        if (cursor != null) {
            if (cursor.moveToFirst()) {
                do {
                    item = new Info_Name_Main();
                    item.setName(cursor.getString(0));
                    arrayList.add(item);
                } while (cursor.moveToNext());
            }
        }
    } catch (SQLException e) {
        e.printStackTrace();

    }
    LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
    adapterMain = new Adapter_Name_Main(getActivity(), arrayList);
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(linearLayoutManager);
    recyclerView.setAdapter(adapterMain);
}