Android按返回键退出程序但不销毁，程序后台运行，同QQ退出处理方式

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@Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            moveTaskToBack(false);
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }