...Guidelines for content creation Policies on ads and monetization Algorithm insights: How content algorithms work (e.g., TikTok's recommendation system) Tips for leveraging algorithms to increase visibility Regional differences in platform rules and strategies for adaptation Phase 3: Industry Selection and Audience Analysis Identifying lucrative industries: E-commerce, education, entertainment, travel, etc. Understanding audience segmentation: Age, gender, interests, and regional preferences Market analysis tools for selecting industries and niches Phase 4: Content Planning and Execution The content creation lifecycle: Topic research Scriptwriting and visual storyboarding Filming and editing best practices Essentials for platform-specific content: TikTok short videos...
...Guidelines for content creation Policies on ads and monetization Algorithm insights: How content algorithms work (e.g., TikTok's recommendation system) Tips for leveraging algorithms to increase visibility Regional differences in platform rules and strategies for adaptation Phase 3: Industry Selection and Audience Analysis Identifying lucrative industries: E-commerce, education, entertainment, travel, etc. Understanding audience segmentation: Age, gender, interests, and regional preferences Market analysis tools for selecting industries and niches Phase 4: Content Planning and Execution The content creation lifecycle: Topic research Scriptwriting and visual storyboarding Filming and editing best practices Essentials for platform-specific content: TikTok short videos...
1. Project Overview A multilingual, international customer service platform that allows users to configure multiple chatbots with GPT API integration for AI-powered responses. The platform will offer flexible permission management, business features (e.g., chatbot-based pricing, coupon support, affiliate marketing), and support user-defined group management to meet the needs of enterprise clients. 2. System Roles and Permissions 1. Administrator (Admin) • Manage global functions and configurations, including user management, subscription management, affiliate marketing, cashback rewards, etc. 2. B-End Users (Enterprise Customers/Platform Users) • Primary Account: Responsible for creating and managing chatbots, configuring customer service...
...js 18.x or higher npm 9.x or higher Knowledge Requirements: Basic knowledge of PHP, JavaScript, and web development Familiarity with Composer and npm package managers Development Requirements Payment Gateway Integration Payment Gateway 1: Airspay Integrate the Airspay payment system, supporting one-time payments via Alipay and WeChat Pay. Use the API to generate a payment QR code directly on the platform, allowing users to scan and pay without redirection. Documentation: Payment Gateway 2: Cryptomus Support USDT payments through the Cryptomus platform with a one-time payment setup. Documentation: Payment Gateway 3: Airwallex Integrate the Airwallex payment system, supporting AlipayHK, WeChat Pay, Alipay, and credit card options
Use PHP to copy this AI management panel and add new functions. Our situation: At present, our software has a web version front-end (the front-end has source code, written in Vue3+Gin); The back-end (the management panel obtained by purchasing a license, all functions are encrypted). We need to develop an management panel that is exactly the same as it. And add some new functions to make it more suitable for mobile phone display effects. Optimize AI functions: Add new functions and optimize AI functions: including: the original AI Chat function (add canvas function, search function, memory function, multimodal function, export document function, real-time voice interaction function, voice to text function, memory function), AI drawing function (add editable pictures...
...functionality of the existing system, with a focus on improving user experience, security, subscription services, payment integration, and management capabilities. The goal is to develop a versatile and flexible AI API platform that ensures system stability, efficiency, and security. Website: 2. Development Features Overview 2.1 Bug Fixes Add a fix for the logo redirection bug: Correct the error where the logo does not redirect properly, ensuring normal navigation to the homepage or the specified page. Add a check for all code bugs: Conduct a thorough code review, identify and fix all potential issues, ensuring logical correctness and stable operation of the code. 2.2 Data Monitoring and Display Add data monitoring features in the admin system, displaying...
...Optimization: Update and optimize backend code to meet the requirements of the iOS version, improving performance and connection speed. VPN Protocol Integration: Integrate the V2ray protocol in the iOS application using sing-box client to ensure a secure and stable VPN connection. Membership Feature Integration: Develop and synchronize membership management features on the iOS client, including user registration, login, and subscription management, consistent with the Android version. Responsibilities: Feature Synchronization & Consistency: Sync all features from the Android source code to the Flutter-based iOS version. Ensure consistency in UI design, user experience, and interactions, adding response status pop-ups as needed. Issue Resolution & Debugging: Reso...
The game includes: Unboxing, Box Fight, Coin Flip, Roulette, Crash The requirements are as follows 1. Refer to or csgoempire’s case battle. There must be a reasonable algorithm to control the profit margin while ensuring a good user experience and being a...csgoempire’s case battle. There must be a reasonable algorithm to control the profit margin while ensuring a good user experience and being able to win big prizes. 2. A team must have development experience 3. Complete within the specified time limit 4. The best is the existing source code 5. Front-end development using VUE3 6. Both Chinese and English languages are required, and the backend management system needs to be fully Chinese. 7. The laboratory requires the use of PHP or Java or Golang for developme...
...Requirements Frontend Development Requirements Menu Click Limitation Copy and Debugging Protection Multilingual Support Membership Plan Selection Interface Agent Page Backend Development Requirements Software Update System Invitation System Membership Pricing and Plan Modification Agent Membership Functionality Enterprise Functionality (Management Center) Card Code Redemption System Exclusive Membership Line Settings Email Configuration FAQs and Banners Management Copywriting Management Admin Panel Requirements Multilingual Switching Login Security Enhancement Order Management User Management Online Status Display Data Statistics and Reports Task Center (Planning Center) Development Notes Details to Discuss Overview This developme...
...Ensure compatibility with the iOS application and enhance overall performance and connection speed. 4. **VPN Protocol Integration**: Integrate the V2ray protocol into the iOS application using the **sing-box client**. Ensure secure and stable VPN connections and optimize performance. 5. **Membership Feature Integration**: Implement and synchronize membership management features, including user registration, login, subscription management, and access control on the iOS client, to match the Android version. **Specific Responsibilities:** 1. **Feature Synchronization and UI Consistency**: Sync all functionalities and UI elements from the provided Android source code to the iOS version, ensuring a consistent user experience. 2. **Issue Resolution and Debugging**: Diagnose...
...Ensure compatibility with the iOS application and enhance overall performance and connection speed. 4. **VPN Protocol Integration**: Integrate the V2ray protocol into the iOS application using the **sing-box client**. Ensure secure and stable VPN connections and optimize performance. 5. **Membership Feature Integration**: Implement and synchronize membership management features, including user registration, login, subscription management, and access control on the iOS client, to match the Android version. **Specific Responsibilities:** 1. **Feature Synchronization and UI Consistency**: Sync all functionalities and UI elements from the provided Android source code to the iOS version, ensuring a consistent user experience. 2. **Issue Resolution and Debugging**: Diagnose...
项目名称：AI智慧园区管理平台 项目概述： 我们正在寻找一支富有创新精神、技术实力雄厚的开发团队，共同打造一款集AI技术与大数据分析于一体的智慧园区管理平台。该平台旨在通过智能化、数字化的手段，全面升级园区管理效率，提升用户体验，促进园区内商业、生活、安全、税务等多方面的智能化融合。本项目将以Java为开发基础，采用分布式与微服务架构，确保系统的高可用性、可扩展性和灵活性。 项目技术要求： 1. 技术栈： 主要编程语言：Java（包括但不限于Spring Boot、Spring Cloud等框架） 分布式架构：基于Kubernetes或Docker容器化部署，实现服务间的松耦合与高效调度。 微服务架构：将系统拆分为多个独立的服务，如用户服务、支付服务、数据分析服务等，通过API Gateway进行服务间的通信与管理。 数据库：采用MySQL/PostgreSQL等关系型数据库存储结构化数据，结合Redis、MongoDB等NoSQL数据库处理高并发访问与缓存。 消息队列：Kafka/RabbitMQ等，用于解耦系统组件间的依赖，提高系统响应速度和容错性。 大数据处理：Hadoop/Spark等用于海量数据的存储与处理，结合Elasticsearch等实现快速检索与分析。 AI与机器学习：集成TensorFlow/PyTorch等深度学习框架，实现图像识别、自然语言处理等AI功能。 2. 功能需求： AI数字名片：通过人脸识别与AI分析技术，为园区内人员生成个性化的数字名片，支持快速识别与社交互动。 智慧园区：集成物联网（IoT）技术，实时监控园区内环境（如温湿度、空气质量）、能源使用情况及设备状态，实现智能化管理。 智慧商城+跨境电商：搭建在线商城平台，支持商品展示、在线交易、物流跟踪...
... --- I am looking for a skilled freelancer to develop a SIEM and SOAR platform for my cyber security needs. The platform should have the following features: - Log management and analysis capabilities - Efficient threat detection and response mechanisms - Automation and orchestration functionalities While I do not have a specific platform in mind, I am open to recommendations from the freelancer. As for the budget, I am looking for a solution that falls within the range of less than $3,000. Ideal Skills and Experience: - Experience in developing SIEM and SOAR platforms - Proficiency in log management and analysis - Knowledge of cyber security threats and response mechanisms - develop the platform using amy programming language If you have the neces...
We will be recruiting a recruitment specialist for our Malaysian branch to recruit local technical personnel. Job responsibilities: 1. Responsible for the administrative management of the company; plan and implement company employee recruitment; to screen, shortlist, and interview candidates to identify the best fit for the position; 3. Establish and maintain employee records and the signing, modification, renewal, and termination of labor contracts; 4. Assist the team in other HR related tasks. Job requirements: 1. More than three years of recruitment related work experience in the internet industry is preferred; 2. Familiar with the operation and application of commonly used office software; 3. Having certain communication and expression skills, Mandarin proficiency is
T29. Simule a integração de 2 documentos manuais de acordo com o ponto 2.4 do Despacho n.º 8632/2014 de 03 de julho do Diretor Geral da Autoridade Tributária e Aduaneira sendo que o 1º documento pertence à série F com o nº 23 do dia 14-01-2022 e o 2º pertence à série D com o nº 3 do dia 12-01-2022 e respetivo PDF. (Note que, de acordo com o ponto 2.4.2, deve ser criado um novo documento do mesmo tipo que recolha todos os elementos do documento manual emitido, significando que todos os elementos são de introdução livre, por exemplo: denominação usual, quantidade, preço, valor do imposto, total de imposto e do documento, etc.); T30. Simule a integraç&ati...
最近在建一个外卖送餐的网站，需要接入Xunhupay的（微信和支付宝）支付模块。 网站使用的是foodomaa的整站代码： 需要的技能有： Software Version: PHP 7.x Software Framework: Laravel File Types Included: JavaScript JSJavaScript JSON HTML CSS PHP SQL Layered PNG 如果您感兴趣，可以写信给我，价格好商量。 另外网站还有其它的一些改版工作要做，我们可以具体讨论一下能不能一并做。 等您回复哦……
1. Can import 500 ip proxy addresses at the same time 2. Can upload picture folder 3. You can upload text files 4. Each different ip address corresponds to a different facebo...corresponds to a different facebook registration entry 5. Each ip address can be replaced or deleted at any time 6. After successful registration, the avatar will be randomly selected from the picture folder, and the name will be randomly selected from the text file 7. Automatically apply through friends, and the time interval for applying through friends can be set by yourself 8. Integrated management of all account messages and comments 9. Real-time update statistics of the number of all friends, like, share, and comment 10. You can clear all accounts and all information with one key, and then start again, ...
货物管理，人员管理。货物管理分库存和包装。人员管理分每天的工作时间和采摘量 Managing the employee working time, and takes they have done in one day. The inventory management, in stock number, and package number.
0. Use python 3.7/3.8, and please leave some comments and notes 1. A small crawler program on Windows; I can download the file and click an .exe for running it. This program has an interface for some simple operations: there is a search box and search button in the page, a status bar, a conversion button, an import...Then I can click a button on the interface to create an excel that includes list1 and list2, and to derive a file that has the database formed in step7. I can choose where I want to save these files. 9. The program has another button for visualization. When I click the button, it can generate a picture of the mapping relations in the most recent step7 file, or in a step7 file that I choose. The visual effect should be something like the picture attached called "...
Expedia , sabre, WordPress , travel and hotel
我需要您来为我开发一些软件。该软件需要开发。
magento mysql查询量很大，cpu负载超过 1000%
开发一款原生app，这是一个基于地理位置的社交应用程序。 它具有泛游戏功能，支持多种语言等功能。 适用于Android，IOS，Windows和其他手机操作系统，使用Java，objective-c，Visual C ++和不同的框架进行开发。 整个项目包括设计，开发，测试，正式发布，数据反馈等。 开发人员需要提供各种文档，信息，源代码和其他所有材料。 为了说明这种情况，我们在中国。 在中国，Google，Facebook和Twitter受到限制或无法使用。 项目开发使用的地图API，当用户在中国时，只能使用百度地图或高德地图，当用户在中国境外时，可以使用谷歌地图或百度地图。 我们希望用户成为地球上的人，而不仅限于中国人或外国人。 使用搜索，第三方登录，语言时，要考虑中国的国情。 熟悉谷歌开发平台，熟悉中国的开放平台，百度、阿里巴巴、腾讯等。 目前，我们有初步的想法和草案设计。 我们需要专业人士或团队来发展和完善。 虽然它只是一个小项目，但没有很多钱，不足以匹配你的硬性工资。 如果您或您的公司可以帮助我们完成它，我们将不胜感激。如果愉快地合作，我们可以考虑长期合作。
We currently own an app which has basic function realized, but there're some other problems existing, including flashbacks, mis-matches between images and audios. We now need these problems to be solved.
We run an e-commerce website, and now we want to find a big cow with experience in information security to do system security work for us. Need to have experience in website penetration testing. The freelancer should be an information security practitioner 我们经营着一个电商网站，现在我们想寻找一名在信息安全方面有经验的大牛为我们做系统安全工作。需要有网站渗透测试经验。
1.在access选项卡下增加购买栏，后台可以输入金额，前台用户访问页面时支付相应金额以后可以访问内容； 2.用户可以自己购买用户组，用户支付一定的金额，可以在一段时间内成为某一个用户组成员 3.支付方式包含支付宝和微信支付（扫码、链接等都需要支持） 4.详细说明请查看附加文件
We have completed the graphic design and graphic materials, to speed up the project that want additional resource to help us to code for HTML 5 pages. - Adaptive HTML for mobile devices - Multi- environment support(Iphone 6 - 8, Iphone X and android phones) - Expected 2.5 weeks to complete entire page development, 0.5 weeks for testing and fixing - Basic test from developer before releasing every build to us. Final acceptance test will done by us - NDA is needed before start sharing project infomation 目前我们正在开发一个餐厅订单后台处理的平台，需要另外一名freelance来加速HTML5的开发进程。 - 目前我们已经完成了页面额设计和PS素材的制作，开发人员可以直接使用。 - 自适应网页制作，尤其是针对不同的移动设备（Iphone 6 - 8, Iphone X and android phones） - 希望在两周半的时候完成页面的开发（希望每两两天提交代码，以便早点检查和反馈），大概3-5天做验收测试和问题修复 - 希望开发人员会做基本的自测，确保发给我们验收的内容有一定的质量。当然我们也很希望开发者可用提出一些专业的建议和意见 - 需要和我们签订保密协...
这个工作是一个关于管理领率的项目，要求有一定的Excel技巧，我希望可以再3天内完成
...Native、Redux等， 要在现有的App架构下调整与新增功能， 后端API程式已开发完成。 要实作的功能: 1. 个人资料:!AqPM7dbV2A19gQsDiRtydgboa-TT 2. 预约谘询:!AqPM7dbV2A19gQ1hUcdb7QlMDpIX 3. 相簿:!AqPM7dbV2A19gQ_NccI-ke6PWFks 撰写以上API 前，需要登入取得资讯，以下为登入的教学（不需撰写此部分） !AqPM7dbV2A19gQc136QJKAVDrPEd React Native App Development (iOS & Android) We already have a basic application development framework, React Native, Redux, etc., to adjust and add new features under the existing App architecture, and the backend API program has been developed. To implement the function: 1. Personal information: !AqPM7dbV2A19gQsDiRtydgboa-TT 2. Appointment consultation: !AqPM7dbV2A19gQ1hUcdb7QlMDpIX 3. Albums:
Basic knowledge about startup business in China, will be preferred. 最好对手机应用有兴趣和有关中国启动行业有基本知识。
...送键值60，从event0读取。 2. RS485驱动 RS485需要1个方向控制脚，当向对应的UART发送接收数据时，方向脚能自动实现方向控制。 3. 蜂鸣器驱动 蜂鸣器驱动要求能设置PWM输出的频率，输出的时间，输出时间到了自动关闭PWM输出。 4. 薄膜按键驱动和USB键盘驱动 预留24个GPIO作为薄膜按键的输入，目前的驱动是作为GPIO口来读取的；最好也缴入LINUX的输入事件，按不同的按键发送不同的键值，从event0读取；外接USB键盘驱动最好也从event0读取。 5. 其他GPIO驱动 每个GPIO口都可以通过驱动设置输入/输出。 6. 触摸屏驱动和外接USB鼠标驱动 7. 触摸屏驱动和外接的鼠标驱动设备文件最好固定，例如触摸屏固定使用event2，USB鼠标固定使用event3。 ENGLISH Basic Requirements for Hardware Resources of T3 Core Board Basic Hardware Resources 1. Power Supply DC power input, 5V single power input, CPU can detect whether this power supply; Battery input, lithium battery power input; Real-time clock power supply, use button battery; 2 Display interface to support RGB, LVDS and MIPI interface, as only one interface can be used at the same time, so the three interfac...
想要设计一个云平台的酒店管理系统的界面，主要用户为中小酒店业主，希望用户界面清爽，简介，方便易用。
1、要求能够清晰、直观地体现“金融”、“服务”、“孵化中心”的行业特点。 2、由于公司面对的客户都是国际性的大型金融机构，设计风格要求国际化、富高科技和时代感。 3、可参考公司主要发起人的VI信息: 香港志鸿科技控股（Excel Technology International Holdings Limited）松山湖创业投资管理公司（Lake Venture Capital Management Inc） 4、设计师要对设计构思进行详细说明。 5、此静态logo适合做动态的logo片头。 6、LOGO基础应用设计应注明标准字，标准色使用规范，并能提供多种配色方案参考选择。 7、需提供AI，CDR，PSD等格式原文件，应为矢量图。 四、设计产权： 1、所设计的作品应为原创，并保证此前未以任何形式、在任何领域公开发表，未侵犯他人的著作权；如有侵犯他人著作权，由设计者承担所有法律责任。 2、设计方案或任何用于创作参选作品素材，均不得侵犯第三方的任何著作权、商标权、专有权利或其他权利，不得触犯相关法律法规。 3、作品一经采用，所有权、修改权和使用权均归征集方所有，创作者不得再在其他任何地方使用该作品；中标作品的著作权和使用权归征集方所有。征集单位享有对方案进行再修改、展示、出版及其它形式的宣传等权益。未经授权，任何单位和个人不得将本次征集的中标方案进行宣传、出版、展览等，不得向第三方转让，否则征集单位有追究法律责任的权利； 4、一旦竞标成功, 竞标人须先把中标作品的设计底稿、电子文档（提供的图片和图形必须达到实际应用的分辨率），交至我方，经我方确认后才能交割佣金；
...Familiar with geo-location based services and map integrations。 3. Simple rating system for both providers and clients. 4. Familiar with Chinese source code and regulations. 5. Ability to develop the apps within 5 months max. Context: The basic outline of the app would be into 3 features where “client” will chose a service from “provider” 1. Find an available nearby provider within 1-3 Km: a timer will calculate the fee and the distance. 2. Book for a later time: A fee according the time required. 3. Awarding Service: a simple wall where Client can post a service request 1 per month detailing fees, service description, address/location and upload JPEG then gets notification. 4. Simple rating system for both providers and clients. ...
一个行政系统内部的教学管理系统，方便受培训的教员和学员进行线上沟通，作业审批，互动等功能。目的是提高交互性和创新性。价格不封顶。
我们需要一位经验程式编写员编写软件破译ireserve-hk(sms registration code system) 1.于上午8点ireserve开店前(UTC+0800)提取PH code(text code) +/or 2.提取PH code后即时破译产出registration code +/or 跳过sms验证页面 请于1-3天内完成 , 请电邮给我进一步讨论
我需要一名经验程式员编写软件破译irserve-hk(sms registration code system) 预订网站: 要求: 1.于上午8时开店前提取PH code 及/或 2.于上午8时开店前提取PH code 及 获取sms验证码 及/或 3.提取PH code后即时破译计算出sms验证码 及/或 4.破译跳过sms验证页 需于1-3天内完成
我現在有一個以visual foxpro 編寫的軟件，它會自動從網上下載資料並儲存在電腦中，透過軟件的介面顯示所需資料。現在的項目想將下載並儲存在電腦的DATA擷取到EXCEL/ACCESS，從而不用透過FOXPRO 編寫的程式也可以利用EXCEL/ACCESS 作查詢。由於軟件的介面是中文，所以必需懂得中文才可以完成這個項目。
sufyanali961，您好，我看了您的个人资料，想与您进行项目合作。我们可以通过聊天对话进一步讨论细节。Pinterest management
想找一個熟悉Wordpress Web Designer，長期Freelance工作，時薪，工時彈性
Hotel customers using a membership card management system , a need to develop alternatives to achieve full functionality. Features include : And existing interfaces hotel room sales management system ( call each webservice form , with the other engineers do ) ; Membership card classification management , distribution , auditing , enable, payment and other packaging ; Corresponding financial statements , business reports ; Query function ; ( Detailed function menu , see Annex photo ) Claim: We had a similar successful projects ; Autonomously communicate with customers , to explore the details of the demand ; Hotels need to travel to the customer site commissioning and implementation of the ( secondary cities in Sichuan Provi...
I want to find a xrumer / Scropbox SEO software management experts: 1. Proficiency xrumer / Scropbox SEO software， collect and organize resources and released 2. can independently develop Xrumer MOD, collect resources backlinks, backlinks release. 3. Skilled google SEO, site keywords planning, 4. Software Management Time: per month
Base on a Joomlashine Venture Pro template to build a basic multilingual website.
目前我们有个PHP项目（已有国外accelerator选中），主要是帮助欧洲中小企业更好地找中国大陆的产品或者供应商。 希望找一位负责任的PHP工程师，developer Laravel to mantain web application already done (90%) based on support tickets model. Requested skill: HTML, CSS e Bootstrap, PHP, MySQL, JavaScript and jQuery, Blade, Eloquent and basic knowlege of LAMP to work in deploy mode. 目前我们考虑的是技术入股（都可以商量），有兴趣的话，其他方面都可以详聊。 （只要有心做好这个项目，在职人员、自由职业者等都可以。懂英语的优先）
我们公司由风险投资VC资本支持, 我们专注于发展/本土化高端品牌，正在打造成中国最大的休闲娱乐公司。我们正跟海內外的行业佼佼者合作, 开展不同的项目, 包括：马术中心、老爷车俱乐部 等。在上海的旗舰项目, 将成全国最顶尖的马术中心和家庭俱乐部， 老爷车俱乐部。 Magic is a venture backed company, specializing in developing/localising worldwide entertainment & leisure brands. We are on track to become the largest multi-brands, location-based leisure & entertainment management company in China. Projects include: family club, equine centre, classic car club, art museum, theme park, etc." logo用来代表上海迈奇公司旗下Arion高端英式家庭俱乐部，马术俱乐部，老爷车会所等，希望设计有品味，有质感。 Our logo will represent our "Arion" high end UK style family club, equine club and classic car club, looking for creative, elegant and quality designs. 我们需要3个logo, Arion 为主要的公司Logo, 然后Arion 马术俱乐部, Arion 老爷车俱乐部。 We are looking for 3 logos, Ar...
Looking for someone to create and manage a wechat group. Scope includes coming up with attention grabbing ideas to drive "Likes", writing/refreshing content, uploading content (words, gif, videos, images) manage Q&A etc for a year
需要在北京附近的廊坊，作一个认证与授权系统的安装、配置与维护。解决一些基本的技术问题。 时间： 3-6个月； 需要熟悉Linux，了解Web与java开发；网络的基本配置与维护；需要解决问题的能力强，沟通能力强；
...customer registration, email validation b. customer to invite other customers, and get referral discount. (Invite another customer, both get a coupon) c. online appointment, appointment will be send to manager's email for approval, manager can approve from the email link d. therapist management function, can easily add/delete employee, and arrange employee on duty. e. service management function for cashier, payment calculation for employee and cashier. f. coupon management, coupon will have expire date. g. interface for manager to publish some information on the side new feed bar. h. support google map. 网页设计要求 1. 设计大方简洁，适合按摩店特色,支持手机浏览以及预约，可以支持多个按摩店（不同名字），不同主页 2. 语言支持：英文 3. 需要有适合手机浏览的页面 4. 需要有...
The app is a simple money keeper app, but it allows users to login to our website as a member to activate back up function. You can see the app visual demo here: And basically the app is similar to We need both iOS and Android version
