拆除其内部的标签和活动（意向）从TabHost [英] Removing a tab and the activity (intent) inside of it from a TabHost

问题描述

我有一个应用程序可以动态地创建标签。当我创建一个标签我发起一个活动的意图。像这样：

I have an app that can create tabs dynamically. And when I create a tab I initiate an activity as an intent. Like so:

private void addTab(Context packageContext, Class<?> newClass, TabHost mTabHost, String tabId, String tabLabel){
    // newClass is my Activity class that I want to start in the tab
    Intent intent = new Intent().setClass(packageContext, newClass);
    TabHost.TabSpec spec;
    spec = mTabHost.newTabSpec(tabId).setIndicator(tabLabel)
                  .setContent(intent);
    mTabHost.addTab(spec);
    mTabHost.setCurrentTabByTag(tabId);
}

pretty的标准。而且它的伟大工程。现在，假设我有一个按钮（或者菜单项，等等）在我实例化我的标签内的活动。当用户presses此按钮，我想要的活性，和接头是内侧，被除去并销毁。

Pretty standard. And it works great. Now, suppose that I have a button (or menuitem, whatever) in the activity that I instantiated inside of my tab. When the user presses this button, I want the activity, and the tab it is inside of, to be removed and destroyed.

我似乎无法找到一个简单的方法来做到这一点。我已经找到了TabHost.clearAllTabs（）函数，但是这会破坏所有选项卡和活动，我只是想删除一个。

I can't seem to find a simple way to do this. I have found the TabHost.clearAllTabs() function, but this destroys all tabs and activities, I just want to remove one.

有人建议我救，我已经打开的所有标签的​​列表，然后调用clearAllTabs（），之后我重新我所有的其他选项卡，除了我不想要的。

Someone suggested I save a list of all Tabs that I have opened, and then call clearAllTabs(), after which I recreate all of my other tabs except for the one I don't want.

事情是这样的：

public static ArrayList<TabHost.TabSpec> list = new ArrayList<TabHost.TabSpec>();

我加入这一行我addTab（）函数，使每片创建是记得在我的ArrayList

I add this line to my addTab() function so that every tab I create is remember in my ArrayList:

list.add(spec);

然后当我想删除我的标签我运行这个功能：

And then when I want to remove my tab I run this function:

public static void removeTab(){
    list.remove(list.size()-1); // remove it from memory
    mTabHost.clearAllTabs();  // clear all tabs from the tabhost
    for(TabHost.TabSpec spec : list) // add all that you remember back
        mTabHost.addTab(spec);
}

这将删除我的选项卡从我的ArrayList中，去除所有标签，然后重新创建所有使用我的ArrayList剩余的选项卡。从理论上讲它应该工作，但我得到以下错误，当我尝试调用这个函数：

This removes my tab from my ArrayList, removes all tabs, then recreates all the tabs remaining using my ArrayList. In theory it should work, but I get the following error when I try call this function:

FATAL EXCEPTION: main
java.lang.NullPointerException
at android.widget.TabWidget.setCurrentTab(TabWidget.java:342)
at android.widget.TabWidget.focusCurrentTab(TabWidget.java:366)
at android.widget.TabHost.setCurrentTab(TabHost.java:323)
at android.widget.TabHost.addTab(TabHost.java:216)
at com.example.myapp.TabManager.removeTab(QuikBrowser.java:86)
at com.example.myapp.TabManager.TabWindow.onOptionsItemSelected(TabWindow.java:91)
at android.app.Activity.onMenuItemSelected(Activity.java:2205)

由于某些原因，添加标签时，它会尝试设置当前选项卡，然后点击它一个空指针异常。

For some reason, when adding a tab, it attempts to set the current tab, and it hits a null pointer exception.

如果你们能提出另一种方式实现了我想要做的，还是有办法来解决我目前的方法，我想AP preciate吧。

If you guys could suggest another way of achieving what I want to do, or a way to fix my current method, I would appreciate it.

推荐答案

试着改变当前选项卡为0。

Try changing current tab to 0.

是这样的：

getTabHost().setCurrentTab(0);
getTabHost().clearAllTabs();

我在读，在调用 clearAllTabs（）; 将抛出一个 NullPointerException异常如果不设置tabhost到第一个选项卡（ .setCurrentTab（0））之前调用（ .clearAllTabs（））

I was reading that calling clearAllTabs(); will throw a nullpointerexception if you don't set the tabhost to the first tab (.setCurrentTab(0)) before calling (.clearAllTabs())

另外这个答案可以帮助？ （如何从TabHost 删除标签）

Also this answer may help? (How to remove tab from TabHost)

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