How do you make a list do certain actions when each item is chosen

MIT App Inventor Help
2

One thing you will need is a way to map from text names of colors to the actual color values.

This sample app lets you load a table of color names and codes from the Media folder, choose a color name from a List Picker, and display that color. (Thanks to @SteveJG for the color file.)

blocks
blocks735×892 61.7 KB

color_codes.txt (2.4 KB)
Colors.aia (6.7 KB)
Designer
Azure
initialize global color_table to
initialize global color_table to766×52 9.49 KB

initialize global table_text to
LemonChiffon
to COLUMN table column_number result
to COLUMN table column_number result1470×558 78.5 KB

when File1 .GotText text do
when File1 .GotText text do1308×386 57.8 KB

when ListPicker1 .AfterPicking do
when ListPicker1 .AfterPicking do1440×286 44 KB

when Screen1 .Initialize do
when Screen1 .Initialize do774×180 16.6 KB

The next thing you will need to deal with is keeping a list of components whose colors you want to change, and how to use the Any (Generic) blocks to change the color of each component as you walk the list using a FOR EACH block.

To see code like that at work, see

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