realm清空所有数据库的数据

    /*
     *清空数据库
     */
    public int clearDatabase() {
        Realm realm = Realm.getDefaultInstance();
        try {
            realm.beginTransaction();
            realm.deleteAll();
            realm.commitTransaction();
            return 1;
        } catch (Exception e) {
            e.printStackTrace();
            realm.cancelTransaction();
           return 0;
       }
    }