问android活动后台堆栈

EN

protected void onResume()
{
        super.onResume();
        if (!getMyApplication().isPlatformActive())
        { 
              /* We finish every activity after resuming if we must shutdown application */
              finish();
        }
}

boolean isRootScreen()
{
        /* Every activity will override this and set it to true if want to exit application from here */
        return false; 
}

protected void onBackPressed()
{
        if(isRootScreen())
        { 
            /* You could show a confirmation dialog here */
            getMyApplication().setPlatformActive(false);
        }
        super.onBackPressed();
}