[android-developers] Re: Basic String Array question :(

Yeah, if you don't know the size in advance use ArrayList or Vector.

On Dec 24, 9:32 pm, Mystique <joven.ch...@gmail.com> wrote:
> Dear King,
>
> "array indexing is zero-based, so you would start your loop from 0 and
> go to 9 (where i  < 10)"
> Right sir, I'm aware it's for illustration and I forgot to change it.
>
> "You've initialized an array to exactly three elements. Anything after
> that"
> This part is essential, if I do not know how many element I have then
> I cannot declare it predefine but declare array without value to be
> filled later.
> That is why I have a for loop to extract value from a XML field to
> fill into the array. But the array seems to be null unless I have pre-
> initialise it with something.
> The for loop only fill the data for dummy value I put, if I initialise
> 3 dummy values the for loop fill exactly 3 values and leave the rest
> empty. If i set  set 5 dummy values, the 5 get filled correctly.
>
> Java is not my native and I have read a few java books and written
> full running android apps. Then, still unable to figure this out...
> maybe I need some beer :D
>
> On Dec 25, 11:08 am, TreKing <treking...@gmail.com> wrote:
>
> > On Fri, Dec 24, 2010 at 8:12 PM, Mystique <joven.ch...@gmail.com> wrote:
> > > String[] lv_arr;
>
> > > for(int i=1; i<11; i++){
> > >                lv_arr[i] = "hello";
> > >          }
>
> > > When I toast the value of lv_arr[i] it is null.
>
> > If this is your actual code, you need to initialize the array.
> > String[] lv_arr = new String[11];
>
> > Second, array indexing is zero-based, so you would start your loop from 0
> > and go to 9 (where i  < 10).
>
> > > If I do this:
>
> > > String[] lv_arr = {"hello", hello", "hello"} + the for loop, I can get the
> > > hello value when I do the toast. but [3]-[10] is still null value.
>
> > You've initialized an array to exactly three elements. Anything after that
> > (index 3 and above) is non-existent.
>
> > These are really basic Java concepts. If you don't understand this, I highly
> > recommend you go study Java on it's own and figure this stuff out before
> > trying to do an Android project. You're going to run into a lot of headaches
> > if you try to learn both at the same time.
>
> > --------------------------------------------------------------------------- ----------------------
> > TreKing <http://sites.google.com/site/rezmobileapps/treking> - Chicago
> > transit tracking app for Android-powered devices

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