Lists and goal count

MIT App Inventor Help
1

Hi guys,

I keep getting this error message

Select list item: Attempt to get item number 5 of a list of length 4: [" ", "0", "0", "0"]

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This is my block code

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image1564×1100 181 KB

I also tried with this block code

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image1488×950 165 KB

This is the Home Screen, when the user has logged there 4 goals, they get a percentage 100%, however atm when I log the 4 goals, 75% comes up and 3 out of 4 goals completed and 3 goals saved?

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This is my php code:

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image1216×1036 102 KB

Anyone know how I can fix this?

Thank you

2

Well, as you can see from your error message, you are attemptong to get a fifth element from a list that only has four elements.

It could be that in AI2 list indexes start at 1, whilst in other coding languages list/array indexes start at 0?

3

In your screenshot you do not select the fifth item, so it looks like the error occurs somewhere else in your blocks

You also can display the response content in a label for debugging

Taifun

4

How can I display the response content in a label for debugging?

5

set Label1.Text to get response content

A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook App Inventor 2 Book: Create Your Own Android Apps ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here Course In A Box and the aia files for the projects in the book are here: App Inventor 2 Book: Create Your Own Android Apps
How to do a lot of basic things with App Inventor are described here: How do you...? .

Also do the tutorials Tutorials for MIT App Inventor to learn the basics of App Inventor, then try something and follow the Top 5 Tips: How to learn App Inventor

Taifun

Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by icon24 Taifun.

6

The response content is coming back as Users name eg
Bill Adams, 0, 0, 0 ?

7

Try to understand what @Taifun say. You are error says, you are trying to pick 5th item of an 4 items array list. But there is no evidence in your block (using 5 in index place). In your screenshot the maxinum number used in index place is 4. So share us relevant blocks