监听不到Android 的 Home 键

应用程序监听不了Android 机的HOME KEY事件。 @Override
public boolean onKeyDown（int keyCode, KeyEvent event） {
// TODO Auto-generated method stub
if（keyCode==3）//HOME键码为3
{
HomeKeyNum+=1;
Log.i（"gogler", "home key pressed time is: "+HomeKeyNum）;
}
return super.onKeyDown（keyCode, event）;
}实验结果没有预期日志输出，把键码换成BACK键码4则可以监听到。官方解释：Key code constant: Home key. This key is handled by the framework and is never delivered to applications.