如何清除ActiveAndroid中的所有表？

sqliteDatabase db = ActiveAndroid.getDatabase();
        List<String> tables = new ArrayList<>();
        cursor cursor = db.rawQuery("SELECT * FROM sqlite_master WHERE type='table';",null);
        cursor.moveToFirst();
        while (!cursor.isAfterLast()) {
            String tableName = cursor.getString(1);
            if (!tablename.equals("android_Metadata") &&
                    !tablename.equals("sqlite_sequence")) {
                tables.add(tableName);
            }
            cursor.moveToNext();
        }
        cursor.close();
        for (String tableName : tables) {
            db.execsql("deletE FROM " + tableName);
        }