Question

我有Fragment ActionBar选项卡，TabListener附加到每个选项卡。在我的主要活动中，我得到了一个删除标签按钮，如下所示：

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle item selection
    switch (item.getItemId()
        case R.id.closeTab:
            closeTab();
            return true;
        default:
            return super.onOptionsItemSelected(item);
    }
}

public void closeTab() {
    if(getActionBar().getTabCount() > 1) {
            Tab tab = getActionBar().getSelectedTab();
            getActionBar().removeTab(tab);
    }
}

我想要完成的是在删除之前在我的tab-fragment中运行一些代码。我可以将它放在片段onDestroyView()或onDestroy()中，但是当我按下删除标签按钮时，我只想运行此代码。我检查了TabListener的文档，但似乎TabListener只监听selectionchanges。我的TabListener：

public TabListener(Activity a, String t, Class<T> c) {
    activity = a;
    tag = t;
    myClass = c;
}

/* The following are each of the ActionBar.TabListener callbacks */
public void onTabSelected(Tab tab, FragmentTransaction ft) { 
    // Check if the fragment is already initialized
    if (fragment == null) {
        // If not, instantiate and add it to the activity
        fragment = Fragment.instantiate(activity, myClass.getName());           
        ft.add(android.R.id.content, fragment, tag);

    } else {
        // If it exists, simply attach it in order to show it
        ft.attach(fragment);
    }
}

public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    if (fragment != null) {
        // Detach the fragment, because another one is being attached
        ft.detach(fragment);
    }
}

public void onTabReselected(Tab tab, FragmentTransaction ft) {
}

澄清我的问题：如何在删除标签之前在我的片段中运行代码？

Answer 1

哎呀，我在读完这篇文章后想通了：link。在我的片段中，我放了setHasOptionMenu(true)

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    setHasOptionsMenu(true); 
}

然后我可以在我的片段中添加onOptionsItemSelected。

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
    case R.id.closeTab:
        closeTab();                
        return true;
    default:
        return super.onOptionsItemSelected(item);
    }
}

public void closeTab() {
    ActionBar actionBar = getActivity().getActionBar();
    if(actionBar.getTabCount() > 1) {
            Tab tab = actionBar.getSelectedTab();
            actionBar.removeTab(tab);
            Log.d(TAG, "CLOSED TAB");
    }
}

删除选项卡时，在ActionBar Tab Fragment中运行代码

1 个答案: