CODEWITHSUNDEEP
androidarraysstring
pearmak
pearmak

Reputation: 5027

android: string arrays (copy all or select from another string array with criteria)

Situation:

I have a string array in the resource, which consists of all types of, say, questions.

If user clicks for All types, for example, to select all, then the selection_question string array would copy all the items in all_question.

Yet if user clicks for a specific type of questions, say, to select just animal related questions, then the selection_question string array would copy all the items in all_question that contains "animals" this word.

My code is as simple as follows:

declare:

String[] all_Question ;
String[] selection_Question;

OnCreate:

all_Question = getResources().getStringArray(R.array.all_Q_List); 
all_numberofquestions = all_Question.length;

// reset 
selection_numberofquestions = 0;
selection_Question = new String[0];
j =0;

if to select all:

for (int i = 0; i < all_numberofquestions ; i++) 
{
    selection_Question[i] = all_Question [i];
}

if to select based on some criteria:

for (int i = 0; i < all_numberofquestions ; i++) 
{
    if (all_Question [i].contains("animal"))
    {
        selection_Question [j] = all_Question [i];
        j++;
    }
}

Question:

It then popups with the following error as shown in Logcat:

03-04 22:14:10.568: E/AndroidRuntime(24917): Caused by: java.lang.ArrayIndexOutOfBoundsException: length=0; index=0

I does not understand why it is Out of Bounds? How could the above codes be modified?

Thanks!!

Upvotes: 0

Views: 1035

Answers (1)

Rahul
Rahul

Reputation: 45060

This is the problem.

selection_Question = new String[0];

It should have been

selection_Question = new String[all_numberofquestions];

Or even your all_question could be blank/empty.

Upvotes: 1

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