防止在恢复活动时多次打开对话框 [英] Prevent dialog to be opened multiple times when resuming activity

问题描述

在我的Android应用程序中，为了询问用户是否要恢复当前游戏，我在主要游戏活动上显示一个对话框，显示您是否要恢复当前游戏?是-否"./p>

问题是，如果我在不回答对话框的情况下重复进行多次此活动，那么我会在彼此之上得到多个对话框，这显然不是我的目标.

我可以使用布尔值var轻松避免这种行为，但是我想知道Dialog类是否具有防止重复的选项或类似的类型.

解决方案

您可以使用单例模式，大致如下:

Dialog myDialog = null;


public void showDialog() {
    if(myDialog == null) {
        /* show your dialog here... */
        myDialog = ...
    }
}


public void hideDialog() {
    if(myDialog != null) {
        /* hide your dialog here... */
        myDialog = null;
    }
}

In my Android application, in order to ask the user if he/she wants to resume a current game, I display a dialog saying "Do you want to resume current game? Yes - No" on the main game activity.

The thing is that if I resume various times this activity without answering the dialog, then I get several dialogs, on top of each other, which is obviously not my goal.

I could easily avoid this behavior using a Boolean var, but I was wondering if the Dialog class had a kind of option preventing to be duplicated or something of the kind.

解决方案

You can use singleton pattern, could be roughly like this:

Dialog myDialog = null;


public void showDialog() {
    if(myDialog == null) {
        /* show your dialog here... */
        myDialog = ...
    }
}


public void hideDialog() {
    if(myDialog != null) {
        /* hide your dialog here... */
        myDialog = null;
    }
}

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