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Android Android Lists and Adapters (2015) Updating the Data Model From JSONArray to a Java Array

ArrayIndexOutOfBoundsException??? I saw the exception twice in the video with no mention of it.

I'm wondering why there was an exception. I was looking through the code and stepped through the debugger, but I couldn't figure out why there was an out of bounds exception. As far as I could tell the index with within the array bounds.

Post your code here.

Yeeka Yau
Yeeka Yau
7,410 Points

I noticed this in the video too. I'm assuming this might get dealt with later? I agree with you, i starts at 0, so when we get to 7 (after 8 objects) it should stop.

3 Answers

for( int i=0; i < 8; i++) {
// Loop starts
//#1 Loop
//#2 Loop
//#3 Loop
//#4 Loop
//#5 Loop
//#6 Loop
//#7 Loop
//#8 Loop
//Loop ends
i = 8 //now

means that, increment "i" value by one when a loop FINISHED. At the last loop, because of another loop is finished, value of "i" gets incremented by one for one more time.

So it's value isn't 7, it is 8. But it doesn't throws an exception in the running program because after the last loop, we exit from the for loop and

 days[8] = day;

never runs. It is a preview in the debugger.

Luke Liem
Luke Liem
6,367 Points

Yeah, got the same error.

Doing the following fix the error. Though I have no idea why the array went out of bound in the first place.

private Hour[] getHourlyForecast(String jsonData) throws JSONException { .....

    Hour[] hourlyForecast = new Hour[data.length()+1];

.... }

private Day[] getDailyForecast(String jsonData) throws JSONException { ......

    Day[] dailyForecast = new Day[data.length()+1];

...... }

I got the same error and Luke Liem's fix did not work. After combing through the code with debugger I found that on line 180 I had. Day[] days = new Day[daily.length()];

It should be Day[] days = new Day[data.length()];

If you are getting this error check out this line and see if you have done the same thing!