Android tutorials7 calulator_improve

Sep 17, 2013Download as ODP, PDF0 likes203 views

The document discusses improving an app's code by refactoring repetitive code into a reusable function. It provides an example of creating a "calculate" function that takes mathematical operation strings as parameters and performs the calculation on two variables, returning and displaying the result. This cleans up the code by removing repetitive calculation logic from button click handlers, instead calling the calculate function and passing the operation. It notes the goal is to decrease complexity, increase readability and reusability by extracting duplicative code into functions.

As you probably have noticed, the code is absolutely
the same in each onClickListener except of the
sign operation between two variables.
The additional challenge in programming is to
decrease complexity and length of the code, and to
make as readable and concise as possible.
Mostly its done by swapping repeatable code with
functions, reusable piece of code.

The following function <calculate>, will:
1. Takes input <sign> (with type String).
2.Takes both calculator's input variables.
3. Through <if statements> defines the sign variable and
calculates result appropriately
4. Prints off result in <answer> TextField
private void calculate(String sign) {
firstVar = Integer.parseInt(firstInput.getText().toString());
secondVar = Integer.parseInt(secondInput.getText().toString());
if (sign == "+") result = firstVar + secondVar;
else if (sign == "-") result = firstVar - secondVar;
else if (sign == "/") result = firstVar / secondVar;
else if (sign == "*") result = firstVar * secondVar;
answer.setText(String.valueOf(result));
}

Now we can remove
previous code inside
onClick method with
function
calculate(<math sign
relatively to the button>)
plus.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
calculate("+");
}
});
minus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
calculate("-");
}
});
mult.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
calculate("*");
}
});
div.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
calculate("/");
}
});

Program is shorter but result is the
same.
Thats what we aim for other apps you
are going to make as well.
Now try to fix bug when you make
calculation without assigning
variables yourself.
(hint: use if statements to illuminate null value of the variables)

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What is Model Context Protocol(MCP) - The new technology for communication bw...Vishnu Singh Chundawat

The MCP (Model Context Protocol) is a framework designed to manage context and interaction within complex systems. This SlideShare presentation will provide a detailed overview of the MCP Model, its applications, and how it plays a crucial role in improving communication and decision-making in distributed systems. We will explore the key concepts behind the protocol, including the importance of context, data management, and how this model enhances system adaptability and responsiveness. Ideal for software developers, system architects, and IT professionals, this presentation will offer valuable insights into how the MCP Model can streamline workflows, improve efficiency, and create more intuitive systems for a wide range of use cases.

AI EngineHost Review: Revolutionary USA Datacenter-Based Hosting with NVIDIA ...SOFTTECHHUB

I started my online journey with several hosting services before stumbling upon Ai EngineHost. At first, the idea of paying one fee and getting lifetime access seemed too good to pass up. The platform is built on reliable US-based servers, ensuring your projects run at high speeds and remain safe. Let me take you step by step through its benefits and features as I explain why this hosting solution is a perfect fit for digital entrepreneurs.

Linux Support for SMARC: How Toradex Empowers Embedded DevelopersToradex

Toradex brings robust Linux support to SMARC (Smart Mobility Architecture), ensuring high performance and long-term reliability for embedded applications. Here’s how: • Optimized Torizon OS & Yocto Support – Toradex provides Torizon OS, a Debian-based easy-to-use platform, and Yocto BSPs for customized Linux images on SMARC modules. • Seamless Integration with i.MX 8M Plus and i.MX 95 – Toradex SMARC solutions leverage NXP’s i.MX 8 M Plus and i.MX 95 SoCs, delivering power efficiency and AI-ready performance. • Secure and Reliable – With Secure Boot, over-the-air (OTA) updates, and LTS kernel support, Toradex ensures industrial-grade security and longevity. • Containerized Workflows for AI & IoT – Support for Docker, ROS, and real-time Linux enables scalable AI, ML, and IoT applications. • Strong Ecosystem & Developer Support – Toradex offers comprehensive documentation, developer tools, and dedicated support, accelerating time-to-market. With Toradex’s Linux support for SMARC, developers get a scalable, secure, and high-performance solution for industrial, medical, and AI-driven applications. Do you have a specific project or application in mind where you're considering SMARC? We can help with Free Compatibility Check and help you with quick time-to-market For more information: https://www.toradex.com/computer-on-modules/smarc-arm-family

Semantic Cultivators : The Critical Future Role to Enable AIartmondano

Build Your Own Copilot & Agents For DevsBrian McKeiver

Noah Loul Shares 5 Steps to Implement AI Agents for Maximum Business Efficien...Noah Loul

Artificial intelligence is changing how businesses operate. Companies are using AI agents to automate tasks, reduce time spent on repetitive work, and focus more on high-value activities. Noah Loul, an AI strategist and entrepreneur, has helped dozens of companies streamline their operations using smart automation. He believes AI agents aren't just tools—they're workers that take on repeatable tasks so your human team can focus on what matters. If you want to reduce time waste and increase output, AI agents are the next move.

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