Why Is Onkey() Called Twice

Why is onKey() called twice?

OnKey is fired twice: the first time for key down, and the second time for key up, so you have to filter:

YOUR_VIEW.setOnKeyListener(new OnKeyListener()
        {                           
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {

                //This is the filter
                if (event.getAction()!=KeyEvent.ACTION_DOWN)
                    return true;

                switch (keyCode) {
                case KeyEvent.KEYCODE_1 : 
                    MakeToast(1);
                    break;
                case KeyEvent.KEYCODE_2 : 
                    MakeToast(2);
                    break;
                case KeyEvent.KEYCODE_3 : 
                    MakeToast(3);
                    break;

                }

                return true;
            }

        });

KeyEvent.KEYCODE_BACK getting called twice in Fragment

It is correct that onKey would be called twice, one for a Down event and another one for an Up event. Please try to add a condition:

if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN) {
    ...
}

Hope it helps.

My Button is always called twice with performClick

1. As there are two actions on press KeyEvent.ACTION_DOWN & KeyEvent.ACTION_UP

2. http://developer.android.com/reference/android/view/View.OnKeyListener.html

Returns true if the listener has consumed the event, false otherwise.

Try it...

public boolean onKey(View v, int keyCode, KeyEvent event) {

    if (event.getAction() == KeyEvent.ACTION_DOWN)
          {
                if(keyCode == KeyEvent.KEYCODE_ENTER)
                {
                    recherche.performClick(); // recherche is my button
                    return true;
                }

           }

    return false;
}

Enter key on EditText hitting onKey twice

Ahhhh

I think this is happening for key up and key down?

Why do I have to press the key twice?

The onKeyDown event happens before the character is actually appended to the textbox.

To capture the new character use onkeyup event instead.

Anyway, your code is currently not cross browser.. window.event is not standard instead pass the event as argument to the function like this:

onKeyPress="return submitenter(event)"

Then in the function:

function submitenter(evt){
    //IE fix
    if (typeof evt == "undefined")
        evt = window.event;
    var keycode = evt.keyCode || evt.which;
    ...

Why onKey event double processing in Android?

It is because ,it is detecting both key_down and key_release events, so it is firing the same code twice.

you have to select where you want to process code on key_down or key_release

if (KeyEvent.ACTION_DOWN == event.getAction()) {
    // code to be executed on key press.
}

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