如何知道某项活动已被撤回？

Question

在activity内，有一个按钮，点击后会显示AlertDialog。解除此对话框后，如果用户单击对话框的BUTTON_NEGATIVE，我想执行一些任务。那么如何识别活动是reshown？我知道活动life-cycle，我实现了已知的生命周期状态，但他们没有开始我想要执行的任务！

我实现onDismissListener但它崩溃了：

private OnDismissListener dismissListener = new OnDismissListener() {

    @Override
    public void onDismiss(DialogInterface dialog) {

        if (dialog instanceof ConfirmChoixDownloadDialogView) {

            if (btnClicked == OUI) {

                ...

            }

            else if (btnClicked == NON) { // the BUTTON_NEGATIVE


                Intent i = new Intent(activity, SelectionQuartierActivity.class); // activity is the activity containing the button which shows the Dialog
                activity.startActivity(i);

            }

        }

    }

};

Answer 1

将OnDismissListener添加到对话框：

AlertDialog a = new AlertDialog();
a.setOnDismissListener(new DialogInterface.OnDismissListener()
{
    @Override
    public void onDismiss(DialogInterface dialog)
    {

    }
});

Answer 2

好的，我通过实施activity的{​​{1}}方法并设置activity，从Dialog开始onWindowFocusChanged的提示activity的{​​{1}}内public static的{​​{1}}变量！