在片段添加&之后，不会调用onCreateOptionsMenu.消除

问题描述

限时删除！！

我有一个片段，可以在其中调用ActivityCompat.invalidateOptionsMenu(getActivity());，并且在活动和片段这两个方面都成功调用了onCreateOptionsMenu()方法.

I have a fragment where I can call ActivityCompat.invalidateOptionsMenu(getActivity()); and the method onCreateOptionsMenu() is successfully called on both: Activity and Fragment.

但是，当我使用以下命令在片段上方添加片段时:

However, when I add a fragment on top of the fragment with:

transaction.add(R.id.fragment_home, fragment2, "fragment_ID");
transaction.addToBackStack(null);
transaction.commit();

，然后再关闭它(通过backPress或getSupportFragmentManager().popBackStack();)，ActivityCompat.invalidateOptionsMenu(getActivity());将变得无响应.完全没有调用onCreateOptionsMenu().

and later close it (either by backPress or by getSupportFragmentManager().popBackStack();), ActivityCompat.invalidateOptionsMenu(getActivity()); becomes unresponsive. onCreateOptionsMenu() is not called at all.

我肯定知道，如果我使用replace()而不是add()，它将起作用，但是，由于某些原因，我需要使用add().

I know for sure, that it will work if I use replace() instead of add(), however, for some reasons, I need to use add().

关于活动:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.fragment_home);
    if (fragment != null)
        fragment.onCreateOptionsMenu(menu, getMenuInflater());
    return true;
}

关于片段1:

@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setHasOptionsMenu(true);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    Log.d(TAG, "onCreateOptionsMenu() called with: ...");
    // additional code
    super.onCreateOptionsMenu(menu, inflater);
}

推荐答案

请尝试以下代码:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    Fragment fragment = getSupportFragmentManager().findFragmentById(R.id.fragment_home);
    if (fragment != null) {
        fragment.onCreateOptionsMenu(menu, getMenuInflater());
        return true;
    }
    getMenuInflater().inflate(R.menu.menu_layout, menu);
    return super.onCreateOptionsMenu(menu);
}

这篇关于在片段添加&之后，不会调用onCreateOptionsMenu.消除的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！

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