Disable trackball click in Android

I've run into some difficulties with implementing a custom progress dialog. Even though an overlay intercepts touch events the u开发者_JAVA技巧ser can still operate the trackball and click elements that are supposed to be disabled.

Is there any way around this?

Edit: here's a solution

//=====================================================================================
protected void showProgressIndicator()
{
    progressIndicator_.show();
}

//=====================================================================================
@Override
public boolean onTrackballEvent(MotionEvent event)
{
    return progressIndicator_.getVisibility() == View.VISIBLE;
}

//=====================================================================================
protected void hideProgressIndicator()
{
    progressIndicator_.hide();
}

An then in show method

//=====================================================================================
public void show()
{
    setVisibility(VISIBLE);
    if (animationHandler_ != null)
        return;

    animationHandler_ = new Handler();
    animationHandler_.post(animateTask_);
    requestFocus();
}

---

In order to prevent your trackball doing anything while your activity is on screen, add the following code to your Activity subclass.

@Override 
public boolean dispatchTrackballEvent(android.view.MotionEvent ev) {
  return true;
};

I've tested this on a Google Nexus One phone and it works fine.

---

Check the onTrackballEvent() method. Then try to directly returning true in the method without doing anything in it. This should kill the event right away.

---

Override onTrackballEvent() does not work. Try overriding dispatchTrackballEvent(), do nothing in it just return true;.