Why does ArrayIndexOutOfBoundsException occur and how to avoid it in Android? [closed]

Why does ArrayIndexOutOfBoundsException occur and how to avoid it in Android?

Solution 1:

This exception is thrown when you try to access an array item that doesn't exist:

String [] myArray = new String[2];

myArray[2] = "something"; // Throws exception
myArray[-1] = "something"; // Throws exception

You should check that your index is not negative and not higher than the array length before accessing an array item.

Solution 2:

Why does ArrayIndexOutOfBoundsException occur [...]

Here is a quotation from the Java Language Specification: 10.4 Array Access:

All array accesses are checked at run time; an attempt to use an index that is less than zero or greater than or equal to the length of the array causes an ArrayIndexOutOfBoundsException to be thrown.

[...] and how to avoid it in Android?

You make sure you're indices are within the range [0...yourArray.length-1].

(Note the -1 above. Arrays are 0-indexed which means that you'll find the first element at index 0, and the last at length-1.)