android: consume key press, bypassing framework processing
- by user360024
What I want android to do: when user presses a single key, have the view
respond, but do so without opening a text area and displaying the character
associated with the key that was pressed, and without requiring that the Enter
key be pressed, and without requiring that the user press Esc to make the text
area go away.
For example, when user presses "u" (and doesn't press Enter), that means "undo
the last action", so the controller and model immediately undo the last action,
then the view does an invalidate() and user sees that their last action has
been undone. In other words the "u" key press should be silently processed,
such that the only visual result is that user's last action has been undone.
I've implemented OnKeyListener and provided an onKey() method:
the class:
public class MyGameView extends View implements OnKeyListener{
in the constructor:
//2010jun06, phj: With onKey(), helps let this View consume key presses
// before the framework gets a chance to consume the key press.
setOnKeyListener((View.OnKeyListener)this);
the onKey() method:
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_R) {
Log.d("BWA", "In onKey received keycode associated with R.");
}
return true; // meaning the event (key press) has been consumed, so
// the framework should not handle this event.
}
but when user presses "u" key on the emulator keypad, a textarea is opened at
the bottom of the screen, the "u" charater is displayed there, and the onKey()
method doesn't execute until user presses the Enter key.
Is there a way to make android do what I want? Thanks,
