引用 android的按键响应

下面的是官方的bolg 觉得不错就引用了http://android-developers.blogspot.com/2009/12/back-and-other-hard-keys-three-stories.html

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  {
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
        // do something on back.
        return true;
    }

    return super.onKeyDown(keyCode, event);
}

@Override
public void onBackPressed() {
// do something on back.
return;
}

长按事件

@Override
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_CALL) {
        // a long press of the call key.
        // do our work, returning true to consume it.  by
        // returning true, the framework knows an action has
        // been performed on the long press, so will set the
        // canceled flag for the following up event.
        return true;
    }
    return super.onKeyLongPress(keyCode, event);
}

@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_CALL && event.isTracking()
            && !event.isCanceled()) {
        // if the call key is being released, AND we are tracking
        // it from an initial key down, AND it is not canceled,
        // then handle it.
        return true;
    }
    return super.onKeyUp(keyCode, event);
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)  {
    if (keyCode == KeyEvent.KEYCODE_0) {
        // this tells the framework to start tracking for
        // a long press and eventual key up.  it will only
        // do so if this is the first down (not a repeat).
        event.startTracking();
        return true;
    }
    return super.onKeyDown(keyCode, event);
}