Android: int which in DialogInterface.OnClickListener() is -1

Question

I don't understand why this is happening. I have the following code:

AlertDialog.Builder builder = new AlertDialog.Builder(SettingsActivityNew.this);

builder.setTitle("Title");
builder.setSingleChoiceItems(R.array.example_arrays, 1, null);              
builder.setNegativeButton("Cancel", null);
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
    public void onClick(DialogInterface dialog, int which) {
        Toast.makeText(SettingsActivityNew.this, "which: " + which, Toast.LENGTH_LONG).show();
    }
});
builder.show();

For some strange reason, the int which, keeps giving me -1. Why is this happening?

Answer 1

From the doc :

Parameters
dialog  The dialog that received the click.
which   The button that was clicked (e.g. BUTTON1) or the position of the item clicked.

---

BUTTON_POSITIVE :

public static final int BUTTON_POSITIVE

Added in API level 3
The identifier for the positive button.

Constant Value: -1 (0xffffffff)

So that's not strange but totally normal. You get -1 each time because you clicked on the positiveButton of your dialog :)