Issue with array?

Issue

I have a method leftup which has an onClick listener from a button. The purpose of method leftup is to do the following:

1. Get an array from resources xml (Which contains names of my other activities)
2. Turn array into an array list
3. Remove a string from that array (The current class name)
4. Convert the list back into an array
5. Get a random value from that array
6. Execute method goToActivity with parameter of that random value

I have spent hours on this task so far, because the logic of the code seems fine. The problem is, when I run the code, I get the infamous error:

Unfortunately, "App_Name" has stopped

Here is my code for method onClick and goToActivity:

Here is my array in the resources:

By the way, string activity state is the name of the activity :

I am sure the exception is in the method leftup, as none of the Toasts get executed, and the error happens immediately as I click on the button.

Thank you so much for all your help, I really appreciate it.

A fellow programmer,

{Rich}

Stack trace:

https://gist.github.com/anonymous/dcd63f51289aaf1a1933

Here is the stack trace because I couldn't format it, this is the git hub page.

Solution

I figured it out! After three long hours of tweaking the code, I finally got it! The arrayList had to be a linkedList. Thats it! Because, arrayList's aren't as flexible, and so one cannot remove or add items to them. I hope this answer helps, and saves you three long hours!

java.lang.UnsupportedOperationException
java.lang.reflect.InvocationTargetException

are the exceptions that happen on this issue. Just make sure to use a more flexible container. :)

{Rich}

Answered By - Ruchir Baronia