onKeyDown or onBackPressed in a parent activity

I have a TabActivity that shows other Activities as the content based on which tab is selected. What I want to do is from the 'parent' Activity try to capture the back key press, but neither onKeyDown() nor onBackPressed() ever get c开发者_JAVA百科alled in the parent... it's being handled by the 'child' Activities. Is there any way to have it pass up to the 'parent' Activity?

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Why not just using, from within the child Activity:

@Override
public void onBackPressed () {
    this.getParent().onBackPressed();
}

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You could set up a communication procedure between the TabActivity and his childs.

I created a static Handler in the TabActivity which was initialized in the onCreate of the TabActivity.

Then i created a static getHandler() method (in the TabActivity ).

Now a snippet to achieve your question for your childs would be:

@Override
public void onBackPressed () {
    MyTabActivity.getHandler().sendEmptyMessage(MyTabActivity.BACK_PRESSED);
}

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I have encountered the same problem as well. I sovled it this way:

@Override
public boolean dispatchKeyEvent(KeyEvent event)
{
    if (event.getKeyCode() == KeyEvent.KEYCODE_BACK)
    {
        //things u want to do when back key pressed
    }    
    return super.dispatchKeyEvent(event);
}