Welcome to today’s fun mini project! We’re going to build a simple app using MIT App Inventor that changes the screen’s background color to a random color each time you tap a button. No coding experience? No worries! This guide is super easy and perfect for beginners
What You’ll Need
A computer or tablet with internet
Your Google account
MIT App Inventor (go to ai2.appinventor.mit.edu)
A little curiosity and creativity!
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Step 1: Design the App
1. Open MIT App Inventor and create a new project. Call it “ColorWheel.”
2. In the Designer tab:
Drag a Button from the User Interface section to the phone screen.
Rename it to Button1.
Change its text to say: change color.
Make sure your screen background color is any color you like for now—we’ll change that later!
Step 2: Let’s Make It Work (Blocks Section)
1. Click on the Blocks tab.
2. Choose the Button1 block that says:
when Button1.Click do
3. Now, drag the block that sets the screen background color:
set Screen1.BackgroundColor to
4. Attach a make color block.
5. Next, attach a make a list block to the color block.
6. Add three random integer from 0 to 255 blocks to the list. These represent Red, Green, and Blue color values.
7. That’s it! You’ve built a color-changer!
Code Blocks Used:
1. Event Block
This tells the app what to do when the button is clicked:
when Button1.Click
This block listens for a button press.
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2. Set Background Color Block
This sets the background color of the screen:
set Screen1.BackgroundColor to ...
You’ll use this to tell the screen to change its color.
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3. Make Color Block
This block creates a color by mixing Red, Green, and Blue values:
make color (list of 3 numbers: red, green, blue)
It expects a list of 3 numbers, each from 0 to 255.
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4. Make a List Block
You need this to create a list of the 3 color values:
make a list
You’ll put 3 random numbers in this list—one for each color channel.
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5. Random Integer Blocks
You need three of these blocks. They create random numbers from 0 to 255 (which is the full range for color values):
random integer from 0 to 255
Each one will be used for either Red, Green, or Blue.
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How the Final Code Looks Together (Visually in MIT App Inventor)
when Button1.Click
do set Screen1.BackgroundColor to
make color
make a list
random integer from 0 to 255 // Red
random integer from 0 to 255 // Green
random integer from 0 to 255 // Blue
What It Does:
When the button is clicked...
It picks three random numbers (Red, Green, Blue).
Combines them to make a new color.
Changes the screen background to that color.
How It Works (Simple Explanation)
Every color on a screen is made from mixing red, green, and blue (RGB). The app picks random numbers between 0 and 255 for each color to create a new one each time you click the button.
Test Your App
Click the “change color” button on the phone screen. Watch the background change to a surprise color every time you tap it. It’s like digital magic!
Ideas to Try
Add sound when the color changes.
Show the RGB values on the screen.
Create a color guessing game!
Conclusion: You Did It!
You just made a colorful app without typing a single line of code! MIT App Inventor makes it easy to learn while having fun. Try customizing it more and share your app with friends.
Happy Coding guys
Remember "Any one can code"
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