Android: Unregister camera button

Question

I tried to bind some actions to a camera button:

videoPreview.setOnKeyListener(new OnKeyListener() {
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        if(event.getAction() == KeyEvent.ACTION_DOWN) {
            switch(keyCode) {
                case KeyEvent.KEYCODE_CAMERA:
                    //videoPreview.onCapture(settings);
                    onCaptureButton();
...
            }
        }
        return false;
    }
});

Pressing the button however the application crashes because the original Camera application starts.

Does anyone know how to prevent Camera application start when the camera button is pressed?

Answer 1

In your example you need to return true to let it know you "consumed" the event. Like this:

videoPreview.setOnKeyListener(new OnKeyListener(){
    public boolean onKey(View v, int keyCode, KeyEvent event){
        if(event.getAction() == KeyEvent.ACTION_DOWN) {
            switch(keyCode) {
                case KeyEvent.KEYCODE_CAMERA:
                    //videoPreview.onCapture(settings);
                    onCaptureButton();
                    /* ... */
                    return true;
            }
        }
        return false;
    }
});

It will also only work if the videoPreview (or a child element) has focus. So you could either set it to have focus by default:

@Override
public void onResume() {
    /* ... */
    videoPreview.requestFocus();
    super.onResume();
}

or (prefered) put the listener on the top-level element (eg. a LinearLayout, RelativeLayout, etc).