Element in int Array is not found (while it should)

Question

I don't get the correct index. Can anyone tell me why? I expect 0 as index, not -1.

int[] id = {R.id.buKeyPadNum1, ...} **(EDIT)**
int index = Arrays.asList(id).indexOf(v.getId());

Log.i("onClick", "v.getId "+ String.valueOf(v.getId())+" ButtonId "+String.valueOf(id[0])
+" Index "+String.valueOf(index));

LogCat: 09-25 08:11:32.039: I/onClick(1680): v.getId 2131296337 ButtonId 2131296337 Index -1

index `-1` means it doesn't exist. `v.getId()`'s value doesn't exist in your array — Baby, Sep 25 '14 at 08:26
Really? That is why i posted LogCat output. I try to find v.getId() in array id. id[0] and v.getId() are the same in LogCat.... — user2462619, Sep 25 '14 at 08:30

score 1 · Answer 1 · answered Sep 25 '14 at 08:34

1

Consider such code:

int ix = Arrays.asList(new int[]{1,2}).indexOf(1); 
// result: -1

int ix = Arrays.asList(new Integer[]{1,2}).indexOf(1); 
// result: 0  (found)

Probably your array contains elements with different type from indexOf argument.

answered Sep 25 '14 at 08:34

przemek hertel

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score 1 · Accepted Answer · edited May 23 '17 at 10:33

1

Arrays.asList(id) returns a List<long[]>. indexOf() only works on Long[] objects. See this answer.

Try using the Long[] type for id.

edited May 23 '17 at 10:33

Community

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answered Sep 25 '14 at 08:35

Nachi

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Yes "int[] id = {R.id.buKeyPadNum1, ...}" must be "Integer[] id = {}" – user2462619 Sep 25 '14 at 08:49

Element in int Array is not found (while it should)

2 Answers2