为不同的片段添加菜单项

Override onCreateOptionsMenu method in your every fragment.

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.your_menu_xml, menu);
super.onCreateOptionsMenu(menu, inflater);
}

This is how to create menu dynamically: http://www.101apps.co.za/index.php/articles/using-toolbars-in-your-apps.html

Edited:

Toolbar actionBarToolBar = (Toolbar) findViewById(R.id.my_toobar);
setSupportActionBar(actionBarToolBar);
actionBarToolBar.setNavigationIcon(R.drawable.icon);
actionBarToolBar.setNavigationContextDescription(getResources().getString(R.string.desc);
actionBarToolBar.setLogo(R.drawable.other_icon);
actionBarToolBar.setLogoDescription(getResources().getString(R.string.other_desc);
actionBarToolBar.inflateMenu(R.menu.fragment_menu);

Add similar code to your fragments:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState)
{
View v = inflater.inflate(R.layout.library_fragment, parent, false);
setHasOptionsMenu(true);
return v;
}




@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.your_menu_xml, menu);
super.onCreateOptionsMenu(menu, inflater);
}

This way you can customize the menu for your fragments.

I solved this issues correctly. My solution is as following code:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
mRootView = inflater.inflate(R.layout.fragment_order_history, container, false);
//getActivity().invalidateOptionsMenu();




setHasOptionsMenu(true);


return mRootView;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.main, menu);
super.onCreateOptionsMenu(menu, inflater);
}

I had the same issue and I wanted to replace the toolbar menu accordingly to the fragment displayed.

The problem I'm now facing is that the menu is added to the previous one.

In order to show only the menu for the fragment, I suggest:

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
menu.clear(); //Empty the old menu
inflater.inflate(R.menu.menu_fragment1, menu);
super.onCreateOptionsMenu(menu, inflater);
}

Hope it'll help.

The best way to do it :

1. Find toolbar in Activity and set it as supportActionBar.

Toolbar actionBarToolBar = (Toolbar) findViewById(R.id.my_toobar);
setSupportActionBar(actionBarToolBar);

2. Then It will be a piece of cake to handle option menus for different fragments over a same Activity. Do following things in each fragment as you want:

In OnCreateView Method call

setHasOptionsMenu(true);

And Lastly,

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.main, menu);
super.onCreateOptionsMenu(menu, inflater);
}

And to manage menu items click, we have onOptionsItemSelected:

@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_search :
Log.i("item id ", item.getItemId() + "");
default:
return super.onOptionsItemSelected(item);
}
}

Below are the steps to show different menu options with different fragments.

Step1: Call setHasOptionsMenu(true)

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
setHasOptionsMenu(true)
super.onViewCreated(view, savedInstanceState)


}

Step2: Inflate your fragment related option menu items.

override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
// To clear previously added menu items
menu?.clear()
inflater?.inflate(R.menu.your_fragment_menu, menu)
super.onCreateOptionsMenu(menu, inflater)
}

The simplest option is to do

toolbar.inflateMenu(R.menu.fragment_menu);

and for handle click on menu item

toolbar.setOnMenuItemClickListener {
when (it.itemId) {
R.id.nav_example -> doThat()
}
true
}

Inside XML add this line

app:menu="@menu/main_menu"

Using new MaterialToolbar it's very easy to create an overflow menu and use to:

<com.google.android.material.appbar.MaterialToolbar
android:id="@+id/toolbar"
android:layout_width="0dp"
android:layout_height="?attr/actionBarSize"
app:navigationIcon="@drawable/ic_menu"
app:menu="@menu/main_menu"/>

and then in code to set OnCLick Listeners just add this:

toolbar.setOnMenuItemClickListener {
// .. DO SOMETHING HERE
false
}

This is one way of doing this:

add a "group" to your menu:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android" >


<group
android:id="@+id/main_menu_group">
<item android:id="@+id/done_item"
android:title="..."
android:icon="..."
android:showAsAction="..."/>
</group>
</menu>

then, add a

Menu menu;

variable to your activity and set it in your override of onCreateOptionsMenu:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
this.menu = menu;
// inflate your menu here
}

After, add and use this function to your activity when you'd like to show/hide the menu:

public void showOverflowMenu(boolean showMenu){
if(menu == null)
return;
menu.setGroupVisible(R.id.main_menu_group, showMenu);
}

No one mentioned this method here so here it is. This is a better approach when you don't have many items for each fragment and have the same parent activity. It's taken from this answer.

i had the same problem, what worked for me was this: in my case i have 1 toolbar in the main activity and all fragments will use that toolbar by just adding new menu items to the toolbar

1. set the support action bar in the main activity oncreate method

   MaterialToolbar maintoolbar=findViewById(R.id.topAppBar); setSupportActionBar(maintoolbar);

2. add this in fragment oncreateview

   setHasOptionsMenu(true);

3. override the oncreateoptionsmenu method in your fragment

   @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.fragmentMenu, menu); super.onCreateOptionsMenu(menu, inflater); }

4. handle options menu clicks in your fragment

   @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case ...: break; default: return super.onOptionsItemSelected(item); } ... }