How to call print() with colorful text to android studio console in flutter

Although this didn't work in Android studio, it is supported in VS Code:

void main() {
  print('This is a normal message.');
  printWarning('This is a warning.');
  printError('This is an error.');
}

void printWarning(String text) {
  print('\x1B[33m$text\x1B[0m');
}

void printError(String text) {
  print('\x1B[31m$text\x1B[0m');
}

ANSI escape code explanation

The ANSI escape code string is pretty confusing if you're not familiar with the format.

Here is the string to turn Hello red:

\x1B[31mHello\x1B[0m

And here it is again with spaces added for clarity between the parts:

\x1B  [31m  Hello  \x1B  [0m

Meaning:

• \x1B: ANSI escape sequence starting marker
• [31m: Escape sequence for red
• [0m: Escape sequence for reset (stop making the text red)

Here are the other colors:

Black:   \x1B[30m
Red:     \x1B[31m
Green:   \x1B[32m
Yellow:  \x1B[33m
Blue:    \x1B[34m
Magenta: \x1B[35m
Cyan:    \x1B[36m
White:   \x1B[37m
Reset:   \x1B[0m

Learn more from these links:

• Build your own Command Line with ANSI escape codes
• ANSI escape code

I recommend using Grep Console if you don't want to change the way you actually print the characters

You can add a tag like [DEBUG] to your logs and grep console would do the magic for you.

Emoji

You can use colors for text as others mentioned in their answers to have colorful text with a background or foreground color.

But you can use emojis instead! for example, you can use⚠️ for warning messages and 🛑 for error messages.

Or simply use these notebooks as a color:

📕: error message
📙: warning message
📗: ok status message
📘: action message
📓: canceled status message
📔: Or anything you like and want to recognize immediately by color

🎁 Bonus:

This method also helps you to quickly scan and find logs directly in the source code.

_{But some distributions of Linux’s default emoji font is not colorful by default and you may want to make them colorful, first.}

---

How to open emoji panel?

mac os: control + command + space

windows: win + .

linux: control + . or control + ;

You need to print escape sequences to get the color effects in terminal output.

See also https://en.wikipedia.org/wiki/ANSI_escape_code

https://pub.dartlang.org/packages/ansicolor is a Dart package that makes this easy.