teleren/devto huggingface dataset:
Building a Flashlight App in Android Studio (Java): A Step-by-Step Guide
Tags: programming, tutorial, android, development
Published: 2023-06-15 18:04:34

{% embed https://youtu.be/nb5UcHXrirc %}

Are you looking to create a flashlight app for your Android device? Look no further! In this tutorial, we will guide you through the process of building a flashlight app in Android Studio using Java. Whether you're new to Android Studio or have some experience with mobile app development, this step-by-step guide will help you understand the fundamentals of creating a simple yet practical app.

**Step 1: Setting up the Project**
To begin, we'll walk you through the process of setting up a new project in Android Studio. We'll cover the necessary configurations and project settings required for developing a flashlight app.

**Step 2: Designing the User Interface**
Next, we'll dive into designing the user interface for our flashlight app. We'll discuss layout elements such as buttons and image views, and show you how to create an intuitive and visually appealing interface.

**Step 3: Implementing the Flashlight Functionality**
In this step, we'll demonstrate how to implement the functionality to turn the flashlight on and off. You'll learn how to access the device's camera flash and toggle its state using appropriate APIs and permissions.

**Step 4: Testing and Refining the App**
Once the flashlight functionality is implemented, we'll guide you through the process of testing your app on an emulator or a physical Android device. We'll show you how to handle different scenarios and fine-tune the user experience.

**Step 5: Packaging and Deployment**
With your flashlight app ready, we'll discuss the process of packaging it for deployment. You'll learn how to generate a signed APK file that can be installed on Android devices. We'll also provide guidance on publishing your app to the Google Play Store, if desired.

**Conclusion:**
Congratulations on creating your own flashlight app in Android Studio using Java! Through this tutorial, you've gained a solid understanding of setting up a project, designing the user interface, and implementing the flashlight functionality. This foundational knowledge will empower you to explore more complex app development projects in the future.

We hope you found this tutorial helpful in expanding your Android development skills. If you have any questions or comments, please leave them below. Don't forget to subscribe to our YouTube channel for more exciting tutorials on Android app development.

Now, go ahead and enjoy the convenience of your own flashlight app on your Android device. Happy coding!

**Build android apps without coding** 
Start for free: https://try.draftbit.com/buildwithoutcode

> **Source code:**https://github.com/AhsanAhmed03/Flashlight-App-Android-Java

Feel free to reach out to me with any questions or opportunities at (aahsanaahmed26@gmail.com) 
**LinkedIn** (https://www.linkedin.com/in/ahsan-ahmed-39544b246/) 
**Facebook** (https://www.facebook.com/profile.php?id=100083917520174).
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Increasing Importance of Blockchain for Healthcare Development
Tags: healthcare, blockchain, devops, security
Published: 2023-06-15 18:03:13

Healthcare accounts for a significant portion of the gross domestic product (GDP) in developed countries. In contrast, hospital prices continue to climb, as do ineffective procedures and health data breaches. This is one place where[ Blockchain Healthcare Application Development](https://blockchain.oodles.io/blockchain-healthcare-services/) has the potential to change things.

Blockchain Technology
The term “blockchain” refers to a shared immutable record of a chain of transactions, each of which is made up of one block, and which is kept together by cryptographic keys (“hashes”).

Also, Read | [Blockchain Technology Integration for Business Intelligence
](https://blockchain.oodles.io/blog/blockchain-technology-integration-business-intelligence/)
Technology Advantages in Healthcare
According to the National Institute of Standards and Technology (NIST), the benefits of blockchain technology include its tamper-resistant existence, the decentralized nature of digital ledgers, and the impossibility of modifying a reported transaction later inside the user group that shares the ledger. This technique is also known as digital ledger technology (DLT).

Also, Read | [Blockchain in Healthcare Data Management | Impact, Benefits, and Use Cases](https://blockchain.oodles.io/blog/blockchain-healthcare-data-management-impact-benefits-use-cases/)

Key Challenges in Adoption

The following are some of the major issues with blockchain implementations in healthcare.

At all levels of the network infrastructure, security is paramount.

Both participants’ identities are verified and authenticated.
Authorization trends for access to electronic health records that are consistent

A few Blockchain-Based Healthcare Applications and Use Cases

- Seamless Patient Data Transfers among Healthcare Providers
Enhanced Healthcare Experience for Patients
Secure, Fast, and Interoperable Electronic Health Record System
Improved overall Healthcare Data Protection
Traceable Diseases and Outbreaks

Summarizing

In healthcare, blockchain technologies are in their infancy. Also, Ethereum and Hyperledger Fabric are only two examples of the use of blockchain technology systems in healthcare, that too on a small scale.

[Connect with us](https://blockchain.oodles.io/about-us/) to find out how Blockchain services can improve the management of healthcare data with enhanced blockchain protection and systems.

[Hire blockchain app development](https://blockchain.oodles.io/blockchain-app-development-services/) that enhances data security and privacy in healthcare by providing a decentralized and immutable ledger.

Read the complete Blog here — [Increasing Importance of Blockchain for Healthcare Development](https://blockchain.oodles.io/blog/blockchain-for-healthcare-app-development/)
#Blockchainsolutionsforhealthcare #BlockchainHealthcareApplicationDevelopment #blockchainforhealthcare #Healthcareblockchainsolution
Why is it important for web developers to learn Data Structures and Algorithms (DSA)?
Tags: dsa, datastructures, algorithms, programming
Published: 2023-06-15 17:55:55

Learning Data Structures and Algorithms (DSA) is important for web developers for several reasons:

1. Optimized Code: Understanding DSA allows web developers to design and implement efficient algorithms and data structures. This leads to optimized code that performs well, even with large datasets and complex operations.

2. Problem Solving: DSA equips developers with problem-solving skills. Web development often involves solving complex problems, such as data manipulation, sorting, searching, and optimizing algorithms. Knowledge of DSA helps developers break down problems, devise solutions, and analyze their efficiency.

3. Performance Optimization: DSA knowledge helps web developers optimize the performance of their applications. They can choose the most appropriate data structures and algorithms for specific tasks, reducing time and space complexity and improving overall application performance.

4. Scalability: DSA enables web developers to build scalable applications. Understanding how data structures and algorithms work helps in designing systems that can handle large amounts of data, concurrent users, and complex operations efficiently.

5. Interview Preparation: DSA concepts are often tested in technical interviews for web development roles. Being well-versed in DSA increases your chances of success in interviews and opens up more career opportunities.

6. Framework and Library Understanding: Many web development frameworks and libraries, such as React, Angular, and jQuery, utilize underlying DSA concepts. Understanding DSA helps you better comprehend these frameworks and libraries, enabling you to leverage their features effectively.

7. Problem Domain Understanding: DSA knowledge helps web developers understand and address common challenges in various problem domains, such as graph traversal, string manipulation, and data storage.
A Fábrica de Software com Validade: Reflexões sobre a Durabilidade dos Softwares
Published: 2023-06-15 17:49:54

Na indústria de software, a produção é muitas vezes comparada a uma fábrica, com linhas de produção que fabricam produtos acabados para os clientes. No entanto, ao contrário de uma fábrica de bens físicos, os produtos de software possuem uma "validade", um prazo após o qual podem se tornar obsoletos ou menos eficazes. Vamos explorar esse conceito em mais detalhes.

## A Evolução Rápida da Tecnologia

O mundo da tecnologia evolui a um ritmo rápido. Novos avanços, ferramentas e práticas surgem a todo momento, tornando as soluções antigas obsoletas. Assim, um software que é relevante e eficaz hoje pode se tornar ineficaz ou obsoleto em um curto espaço de tempo. Esta é a "validade" de um software.

##  Manutenção e Atualização Constante

Para prolongar a "validade" de um software, é necessário realizar manutenção e atualização constantes. Isso inclui a correção de bugs, a atualização de características para cumprir com novos regulamentos ou expectativas dos usuários e a implementação de novas funcionalidades para se manter à frente da concorrência.

##  O Desafio da "Validade" do Software

A "validade" de um software apresenta um desafio único para as empresas de desenvolvimento de software. Elas devem equilibrar a necessidade de inovar e manter seus softwares atualizados, com a necessidade de fornecer um produto estável e confiável para seus clientes. Isso requer planejamento cuidadoso e uma gestão eficaz de recursos.

##  Olhando para o Futuro

No futuro, a "validade" dos softwares provavelmente se tornará ainda mais curta, à medida que a tecnologia continue a evoluir rapidamente. As empresas de software precisarão se adaptar, buscando maneiras de atualizar e melhorar seus produtos de maneira mais eficiente.

Em conclusão, a "validade" do software é um conceito crucial na indústria de software atual. As empresas devem estar conscientes de que o software que produzem tem uma "validade" e devem se esforçar para prolongá-la através de manutenção e inovação constantes.
Exploratory Data Analysis(EDA)
Tags: eventdriven, data, datascience, analytics
Published: 2023-06-15 17:46:16

**What is Exploratory Data Analysis**

Exploratory Data Analysis (EDA) is a fundamental data analysis and research stage. This method enables analysts to find patterns, trends, and relationships within a dataset, allowing them to gain insightful knowledge and guide further investigation. EDA offers a comprehensive knowledge of the data, highlighting its salient features and assisting in efficient decision-making. The purpose of this article is to clarify the fundamentals of EDA by examining its goals and highlighting its importance in the fields of data analysis and science.

**Understanding EDA**

To explore and understand data, exploratory data analysis uses several tools and procedures. It includes data cleaning, data transformations, including the detection of outliers or missing values, and descriptive statistics and visualizations. These methods enable analysts to find patterns, connections, and anomalies hiding in the data.

**Objectives of EDA**

1. Data Quality Assessment: EDA allows analysts to assess the quality and integrity of the data, identifying missing values, outliers, or errors. By addressing these issues early on, analysts can improve the accuracy and reliability of subsequent analyses.
2. Data Distribution and Summary Statistics: EDA helps analysts understand the distribution of variables in the dataset. Summary statistics such as mean, median, standard deviation, and percentiles provide a concise data summary, enabling analysts to comprehend central tendencies and variations.
3. Identification of Patterns and Relationships: EDA aims to discover patterns, trends, and relationships within the data. Analysts can identify correlations, clusters, or seasonal variations through visualizations such as scatter plots, histograms, and box plots, providing insights that may lead to further analysis or modeling.
4. Feature Selection: EDA aids in selecting relevant features or variables for analysis. By examining the relationships between variables, analysts can identify which ones are most influential or redundant, refining their analysis's focus and reducing computational complexity.
5. Hypothesis Generation: EDA serves as a springboard for hypothesis generation. Analysts can develop informed hypotheses to be tested in subsequent analyses or experiments by thoroughly exploring the data, contributing to the overall scientific process.
**Importance of EDA**

1. Enhanced Data Understanding: This understanding is crucial for making informed decisions, formulating appropriate models, and ensuring the validity and reliability of subsequent analyses.
2. Outlier Detection and Data Cleaning:  EDA helps clean data, ensuring that subsequent analyses are based on reliable and accurate data.
3. Insights for Decision-Making: EDA reveals valuable insights and patterns that may guide decision-making processes. 
4. Efficient Modeling and Analysis: EDA assists in feature selection and variable reduction, streamlining subsequent modeling and analysis.
Structural Directives:
Tags: angular, programming, beginners
Published: 2023-06-15 17:42:42


## Structural Directives:

1. **ngIf:**
    It is used to conditionally renders or removes an element based on a given expression.

Example:

```Javascript
<div *ngIf="isLoggedIn">Welcome, {{ username }}!</div>

```

The above div tag is rendered if and only if the value of the variable isLoggedIn turns to be True.
Likewise,For React developers reference,In React we use useState hook to do the same conditional rendering.



 **2.ngFor:**
     Renders a template for each item in a collection. In Angular, the ngFor structural directive is used to render a template for each item in a collection by iterating through collections (arrays or objects).It is very similar to for loop in programming language.


Example :

```Typescript

  <ul>
     <li *ngFor="let item of items">{{ item }}</li>
  </ul>

```
     
   

- In the above example, the items is the array or object which contains the list of values to be rendered say bunch of students.The variable item is used to iterate the loop , it is also called the loop variable.

- This directive is used when we have a dynamic data instead of typing multiple statements.

 **3.ngSwitch:**
     _In Angular ,ngSwitch is used to switch between multiple templates based on the value of the condition expression._


**Here's a breakdown of how it works:**

```Javascript

  <div [ngSwitch]="condition">
     <p *ngSwitchCase="'A'">Option A</p>
     <p *ngSwitchCase="'B'">Option B</p>
     <p *ngSwitchDefault>Default Option</p>
  </div>

```



- _Binds the component's condition value to the ngSwitch directive using the syntax [ngSwitch]="condition". Which template within the ngSwitch block should be displayed depends on the value of condition._


- **ngSwitchCase="'A'":**




_When the condition's value matches the case value provided (in this case, "A"), the *ngSwitchCase directive defines a template to be displayed. The p> element containing the text "Option A" will be rendered if condition equals "A."_

- **ngSwitchCase="'B'":** 


_This *ngSwitchCase directive defines a template to be displayed when the value of the condition matches the case value ('B'), similar to the previous case. The p> element containing the text "Option B" will be rendered if condition equals "B"._


- _When none of the ngSwitchCase values match the value of condition, the *ngSwitchDefault directive is used to specify a default template that will be displayed. The element with the text "Default Option" will be shown if condition matches no situations._


- The "Option A", "Option B", or "Default Option" _will be displayed in this example depending on the value of the condition._
 

 This gives flexibility in presenting content based on criteria and enables dynamic rendering of various templates based on the value of a variable or expression.
There are more angular directives like
1.Attributes directives
2.Custom directives
We will see about these topics in the next post.
Happy coding...😉
Object Oriented Programming in 2 minute
Tags: oop, programming, development, tutorial
Published: 2023-06-15 17:34:12

OOP stands for Object-Oriented Programming. It is a programming paradigm that organizes code into reusable and self-contained objects that interact with each other to perform tasks and solve problems. In OOP, objects are instances of classes, which define their properties (attributes) and behaviors (methods).

_The key concepts of OOP are:_

1. **Encapsulation**: It refers to the bundling of data (attributes) and methods that operate on that data within a single unit, i.e., a class. Encapsulation provides data hiding and abstraction, allowing objects to interact with each other through well-defined interfaces.

2. **Inheritance**: It allows classes to inherit properties and behaviors from other classes, forming a hierarchy of classes. Inheritance promotes code reusability and enables the creation of specialized classes based on existing ones.

3. **Polymorphism**: It allows objects of different classes to be treated as objects of a common superclass. Polymorphism enables the use of a single interface to represent multiple implementations, providing flexibility and extensibility.

4. **Abstraction**: It focuses on representing the essential features of an object while hiding unnecessary details. Abstraction allows developers to create simplified models of complex systems and deal with higher-level concepts.

5. **Modularity**: It emphasizes dividing a program into smaller, manageable, and independent modules or classes. Modularity promotes code organization, maintainability, and reusability.


OOP provides several benefits, including code reusability, modularity, extensibility, and easier maintenance. It allows for a more intuitive and structured approach to software development by modeling real-world entities and their interactions. Common programming languages that support OOP include Java, C++, Python, and Ruby.
config ssh không dùng password
Published: 2023-06-15 17:12:22

## tiền điều kiện

- đã biết dùng ssh basic 

## giới thiệu 

sau khi được cấp 1 con linux server, bạn sẽ cần thiết lập SSH để "chọc" vào nó và làm nhiều thứ. 
có 2 tình huống xảy ra 

1. bạn được cấp 1 cái file `abc.pem` 
2. bạn được cấp 1 cặp username/password 

với cả 2 tình huống đó, bạn có thể dùng 2 cái đó 1 lần, rồi config để chép cái key "ruột" của bạn từ trong `~/.ssh/id_rsa.pub` vào server để dùng về sau theo cách sau 

## thao tác

1- tạo 1 cặp key nếu chưa có sẵn. 

  ```bash 
  $ ssh-keygen -t rsa -C "YOUR_NAME@YOUR_PC" 
  
  # trong câu lệnh này mình chọn hình thức mã hóa rsa (`-t rsa`) 
  # và thêm cái "comment" `-C` để khi mình copy&paste cái key này 
  # lên server thì mình biết key này của ai 
  # rồi đại loại thì bạn sẽ bị hỏi có đặt tên file gì gì không, 
  # thường thì chúng ta sẽ bỏ qua và mặc kệ cho ssh-keygen nó tạo 
  # 2 cái file id_rsa và id_rsa.pub thôi 
  ``` 

2- trên client của bạn, mở cái file id_rsa.pub bằng notepad++, vim, hoặc bất kỳ editor nào bạn có trên máy, thường thì nó sẽ trông như thế này 

```
ssh-rsa AAAAB3N.....MBOOuNOZM0= YOUR_NAME@YOUR_PC 
```

3- ssh vào server bằng username/password hoặc bằng pem được cấp 

4- ở trong server, bạn mở cái file `~/.ssh/authorized_keys` ra (bằng `vim` hoặc `nano` gì đó không quan trọng) 
copy&paste cái dòng public key của bạn ở bước 2 vào file này. 
trường hợp, cái file `authorized_keys` này nó chưa tồn tại, bạn tạo ra nó với các phân quyền như sau, **chú ý rằng bạn phải chọn đúng `chmod number` chứ không là ssh không chịu chạy đâu**

```bash 
mkdir ~/.ssh
chmod 700 ~/.ssh
touch ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys
```

5- OK giờ bạn đã có thể enjoy việc ssh vào server bằng cái PC của bạn mà không cần phải kèm theo tham số "pem" hoặc gõ username/password 😎

6- bonus 

một cái best practice là tạo 1 cặp key rồi mang nó đi khắp nơi, thì cho dù cài lại máy nhiều lần, hoặc dùng nhiều máy khác nhau, thì khi bật máy lên là ssh vào server ngay được mà không cần nhớ mật khẩu, không cần phải truyền tham số pem, không cần config vụ này nhiều lần, cứ mỗi server mới thì add cái public key này vào 1 phát thôi. 

thanks [azdigi về phần copy&paste ](https://azdigi.com/blog/linux-server/linux-can-ban/huong-dan-tao-va-su-dung-ssh-key/?gclid=Cj0KCQjw7aqkBhDPARIsAKGa0oKctpTum-0FFW2LAEfjKbewdDKYUMvX0-7TnEylGL7WDlNIRcnieXYaAti3EALw_wcB)

và nếu mang 1 cái key đi khắp nơi, thì khi copy&paste cái cặp key `id_rsa` và `id_rsa.pub` vào 1 cái client mới, nhớ set `chmod 600 id_rsa` chứ không là ăn cái lỗi "permission too open"
Go back to a previous version of Next
Tags: nextjs
Published: 2023-06-15 17:10:14

Hello masters, yesterday in a branch I updated the version of Next to **13.4.5**, and when I returned to the development branch that is made in **13.1.1** multiple problems appeared, apparently the new version was saved somewhere and no longer It lets me use the previous version, that's a problem because the whole team works with that version, I've tried everything and I couldn't get it to work, I hope you can help me
introducing new Vercel AI SDK
Tags: nextjs, javascript, webdev, ai
Published: 2023-06-15 17:06:11

- What is the new frontend AI library?
- How to start new AI web app?

`npm i ai`

TL;DR:

- build your own custom AI Chat on your website fast
- Streaming First UI Helpers
- edge-ready software development kit for AI apps
- built with React and Svelte.

```javascript
'use client'
 
import { useChat } from 'ai/react'
 
export default function Chat() {
  const { messages, input, handleInputChange, handleSubmit } = useChat()
 
  return (
    <div>
      {messages.length > 0
        ? messages.map(m => (
            <div key={m.id}>
              {m.role === 'user' ? 'User: ' : 'AI: '}
              {m.content}
            </div>
          ))
        : null}
 
      <form onSubmit={handleSubmit}>
        <input          
          value={input}
          placeholder="Say something..."
          onChange={handleInputChange}
        />
      </form>
    </div>
  )
}
```

SDK docs:
{% embed https://sdk.vercel.ai/  %}

Vercel AI Playgroud:
{% embed https://sdk.vercel.ai/ %}


---

Godspeed

PS. Follow me on Twitter or LinkedIn
[https://twitter.com/dom_sipowicz](https://twitter.com/dom_sipowicz)
[https://www.linkedin.com/in/dominiksipowicz/](https://www.linkedin.com/in/dominiksipowicz/)