Learning MIT App Inventor: A Hands-On Guide to Building Your Own Android Apps

Creating an Empty List

For now, we’re going to make some lists and store them in variables. This is a common technique, but keep in mind that lists don’t always have to go straight into variables.

To create our first list, we’re going to create a global variable definition (refer to Chapter 4, “Variables”) and drag in the create empty list block (see Figure 6.4).

Figure 6.4 Create a global variable definition and drag in the create empty list block.

Now we have a list! We can give it a name by renaming the global variable. Let’s call it my_list (see Figure 6.5).

Figure 6.5 Rename the global variable to my_list.

Now whenever you use the ...