Скачать или смотреть How to Append a Carriage Return Character to a String in Java, Kotlin, or Android

Learn how to append a `Carriage Return` character to a string in Java and Kotlin for your Android applications. This guide provides clear, step-by-step instructions.
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This video is based on the question https://stackoverflow.com/q/65430309/ asked by the user 'Tim Nuwin' ( https://stackoverflow.com/u/2368378/ ) and on the answer https://stackoverflow.com/a/65430330/ provided by the user 'Damião Martins' ( https://stackoverflow.com/u/3010548/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Append a Carriage Return Character to a String in Java, Kotlin, or Android

When working with USB devices and serial communication in programming, you might encounter situations where you need to format your commands correctly before sending them. One common issue is appending a carriage return character at the end of your strings, especially in Java or Kotlin. If you're writing to a USB device and your command needs a carriage return, this guide will guide you through the solution step-by-step.

The Problem

Suppose you're developing an application that communicates with a USB device using serial communication, and you have a command string like "CMD01". However, the device expects that command to end with a carriage return character to process it properly.

You might start with a line of code similar to this:

[[See Video to Reveal this Text or Code Snippet]]

While this sends the command, it doesn't include the necessary carriage return. So how do you add it?

The Solution: Using \r for Carriage Return

In programming, the carriage return character is represented by the escape sequence \r. To append this character to your string in Java or Kotlin, you can simply modify your command string as follows:

Step-by-Step Instructions

Locate your command string that you wish to send to the USB device.

Append the carriage return character using \r. Here's how your modified code would look:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

"CMD01\r": This string now includes \r, which denotes a carriage return. This means when the command is sent, the device will recognize it as a complete command thanks to the added carriage return.

toByteArray(): This method converts the string into a byte array suitable for sending over serial communication.

Tips for Effective Use

Always confirm whether your device requires a carriage return or other control characters, such as line feed (\n), to function properly.

Test your commands to ensure they're being processed correctly by the USB device.

Conclusion

Appending a carriage return character to a string in Java or Kotlin is easily accomplished by including \r at the end of your string. This minor adjustment can significantly impact how your commands are interpreted by USB devices. Now you're all set to send properly formatted commands to your devices without hassle!

For additional tips and tricks on serial communication or other programming inquiries, stay tuned to our blog!