OnCreateOptionsMenu() 未在 Fragment 中调用

Question

I have an app which got one activity with 2 fragments placed horizontally.

In my activity I inflated menu using onCreateOptionsMenu() using which I am able to display actionbar options menu. But when I try to update the action bar menu items from one of my fragment, the onCreateoptionsmenu() is not called. So, I'm not able to update the action bar options menu.

The code in my activity is as below:

myActivity.java

package com.andr.androidtablelist;

import java.io.IOException;

import android.app.ActionBar;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;

import com.andr.fragments.ListLeftFragment;
import com.andr.utils.DBHelper;

      public class TabletActivity extends Activity {
    ActionBar actionBar = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        DBHelper dbhelper;
        dbhelper = new DBHelper(this);
        try {
            dbhelper.createDatabase();
        } catch (IOException ex) {
            ex.printStackTrace();
        }
        setContentView(R.layout.activity_tablet);
        actionBar = getActionBar();
        actionBar.setDisplayHomeAsUpEnabled(false);
        getFragmentManager().beginTransaction()
                .replace(R.id.master, ListLeftFragment.newInstance()).commit();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.tablet, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case android.R.id.home:
            Toast.makeText(
                    getApplicationContext(),
                    "Back Stack Count::"
                            + getFragmentManager().getBackStackEntryCount(),
                    Toast.LENGTH_LONG).show();
            if (getFragmentManager().getBackStackEntryCount() == 1) {
                actionBar.setDisplayHomeAsUpEnabled(false);
            }
            if (getFragmentManager().getBackStackEntryCount() > 1) {
                getFragmentManager().popBackStack();

            }
            return true;

        }
        return super.onOptionsItemSelected(item);
    }

}
      // http://www.vogella.com/articles/AndroidListView/article.html

myFragment.java

      package com.andr.fragments;


import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.app.Fragment;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.SearchView;
import android.widget.TextView;

import com.andr.androidtablelist.R;
import com.andr.helper.LazyHelper;

   public class ListLeftFragment extends Fragment{
    private static ListLeftFragment listFragment = null;

    public static ListLeftFragment newInstance(){
        listFragment = new ListLeftFragment();      
        return listFragment;
    }

     @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);


    }

     @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
         View v =  inflater.inflate(R.layout.fragment_listlayout, container,false);
         getActivity().invalidateOptionsMenu();
         ListView lv = (ListView)v.findViewById(R.id.lview);
         String[] values = new String[] { "Android", "iPhone", "WindowsMobile",
                    "Blackberry", "WebOS", "Ubuntu", "Windows7", "Max OS X",
                    "Linux", "OS/2", "Ubuntu", "Windows7", "Max OS X", "Linux",
                    "OS/2", "Ubuntu", "Windows7", "Max OS X", "Linux", "OS/2",
                    "Android", "iPhone", "WindowsMobile" };
         getActivity().getActionBar().setTitle("LeftList");

          ArrayList<String> list = new ArrayList<String>();
         LazyHelper lHelper = new LazyHelper(getActivity());
         list = lHelper.getLazyDetials();

           /* for (int i = 0; i < values.length; ++i) {
              list.add(values[i]);
            }
            final StableArrayAdapter adapter = new StableArrayAdapter(getActivity(),
                android.R.layout.simple_list_item_1, list);*/
            LeftListAdapter lAdapter = new LeftListAdapter(getActivity(),list);
            lv.setAdapter(lAdapter);
            lv.setOnItemClickListener(new OnItemClickListener()
            {

                @Override
                public void onItemClick(AdapterView<?> arg0, View arg1,
                        int pos, long arg3) {
                    final String clickedData = (String)arg0.getItemAtPosition(pos);
                    Bundle bundle = new Bundle();
                    bundle.putString("clickedItemName", clickedData);
                    Fragment detailFragment = DetailFormRightFragment.newInstance();
                    detailFragment.setArguments(bundle);
                    getActivity().getFragmentManager().beginTransaction().replace(R.id.details, detailFragment).addToBackStack(null).commit();
                }

            }
                    );
         return v;
    }


     @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        getActivity().getMenuInflater().inflate(R.menu.search, menu);
        SearchView searchView=(SearchView)menu.findItem(R.id.search);
        searchView.setIconifiedByDefault(true);
    } 

     @Override
    public boolean onOptionsItemSelected(MenuItem item) {

         super.onOptionsItemSelected(item);
         return false;
    }


     @Override
    public void onPrepareOptionsMenu(Menu menu) {
         super.onPrepareOptionsMenu(menu);
        /*MenuItem item;
        menu.clear();
        getActivity().getMenuInflater().inflate(R.menu.search, menu);
        SearchView searchView=(SearchView)menu.findItem(R.id.search);
        searchView.setIconifiedByDefault(true);*/
    }

     private class StableArrayAdapter extends ArrayAdapter<String> {

            HashMap<String, Integer> mIdMap = new HashMap<String, Integer>();

            public StableArrayAdapter(Context context, int textViewResourceId,
                List<String> objects) {
              super(context, textViewResourceId, objects);
              for (int i = 0; i < objects.size(); ++i) {
                mIdMap.put(objects.get(i), i);
              }
            }

            @Override
            public long getItemId(int position) {
              String item = getItem(position);
              return mIdMap.get(item);
            }

            @Override
            public boolean hasStableIds() {
              return true;
            }

          }

     private class LeftListAdapter extends BaseAdapter implements OnClickListener {
         private Context mcontext;
         ArrayList<String> listData;
         private  LayoutInflater inflater=null;
         public LeftListAdapter(Context context, ArrayList<String> listItems) {
              mcontext=context;
              listData=listItems;
              inflater = (LayoutInflater)mcontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
         }

        @Override
        public int getCount() {
            return listData.size();
        }

        @Override
        public Object getItem(int arg0) {
            return null;
        }

        @Override
        public long getItemId(int arg0) {
            // TODO Auto-generated method stub
            return 0;
        }

        @Override
        public View getView(int position, View view, ViewGroup arg2) {
            // create a ViewHolder reference
            View vi=view;
            if(vi==null){
                vi = inflater.inflate(R.layout.item, null);
            }
            TextView text=(TextView)vi.findViewById(R.id.text);
            text.setText(listData.get(position));
            vi.setOnClickListener(this);
            return vi;
        }

        @Override
        public void onClick(View vi) {
            TextView text=(TextView)vi.findViewById(R.id.text);
            Bundle bundle = new Bundle();
            bundle.putString("clickedItemName", text.getText().toString());
            Fragment detailFragment = DetailFormRightFragment.newInstance();
            detailFragment.setArguments(bundle);
            getActivity().getFragmentManager().beginTransaction().replace(R.id.details, detailFragment).addToBackStack(null).commit();          
        }

     }
   }

Answer 1

在您的片段的onCreateView()方法中，您需要调用setHasOptionsMenu(true)来告诉宿主活动您的片段具有要添加的菜单选项。

Answer 2

If you are using a theme that does not support ActionBar, then OnCreateOptionsMenu() will not be called automatically, even you wrote all Java codes properly.

You can open AndroidManifest.xml, change the value of android:theme to "@android:style/Theme.Holo.Light.DarkActionBar", or any other themes that support ActionBar.

Answer 3

this worked for me

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    setHasOptionsMenu(true);
    View view = inflater.inflate(R.layout.sample, null);
}

Answer 4

Also, make sure that the Toolbar instance you're passing to

setSupportActionBar(toolbar);

in your Activity is not null , because you won't get an exception if it is indeed null and you will lose a couple of hours like I did.

I used ButterKnife to bind the views, but accidentally placed setSupportActionBar(toolbar) before I actually made the call to ButterKnife.bind()

Answer 5

Simply tell the host activity that your fragment has options menu in its constructor.

\n

public YourFragment() {setHasOptionsMenu(true);}

Although it worked for me, it is discouraged as noted in comment from @aldorain

Applications should generally not implement a constructor. The first place application code can run where the fragment is ready to be used is in onAttach(Activity), the point where the fragment is actually associated with its activity.

So put setHasOptionsMenu(true) in onCreateView() or onAttach() instead.

Answer 6

I you have a theme that doesn't provide you an AppBar by default and you are using a toolbar view to provide this feature instead, DON'T FORGET TO call setSupportActionBar(toolbar) in the onCreate() method of the activity that hosts your fragments.

After that call setHasOptionsMenu(true) in your onCreate() fragment method.

:)

Answer 7

When using the Navigation Architecture Component the action bar is not set so it needs to be done manually:

@Override
public void onViewCreated( @NonNull View view, @Nullable Bundle savedInstanceState ) {
    NavController navController = Navigation.findNavController( view );

    AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder( R.id.nav_1, R.id.nav_2, R.id.nav_3 ).build();

    Toolbar toolbar = view.findViewById( R.id.toolbar );
    ((AppCompatActivity) requireActivity()).setSupportActionBar( toolbar );
    CollapsingToolbarLayout collapsingToolbarLayout = view.findViewById( R.id.collapsing_toolbar );

    NavigationUI.setupWithNavController( collapsingToolbarLayout, toolbar, navController, appBarConfiguration );
}

Answer 8

This one will have diminishing returns as time marches on. In my case it was an androidX dependency on androidx.fragment:fragment:1.3.0-alpha06 which had this bug

simply updating that to a stable version resolved the issue.

Answer 9

For those who have the NoActionBar theme such as: Theme.MaterialComponents.Light.NoActionBar the solution is as follows:

Kotlin version

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    setupToolbar()
    
}

private fun setupToolbar() {
    setHasOptionsMenu(true)
    // The other option is using val toolbar = findViewById(R.id.toolvar) 
    // and add as parameter instead of the binding option
    (activity as AppCompatActivity).setSupportActionBar(binding.toolbar) 
    (activity as AppCompatActivity).supportActionBar?.setDisplayShowTitleEnabled(false)
}

override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
    super.onCreateOptionsMenu(menu, inflater)
    inflater.inflate(R.menu.my_menu, menu)
}


override fun onOptionsItemSelected(item: MenuItem): Boolean {
    return when (item.itemId) {
        R.id.menu_item_1
            //TODO: implement something here for option 1
            true
        }
        R.id.menu_item_2 -> {
            //TODO: implement something here for option 2
            true
        }
        else -> super.onOptionsItemSelected(item)
    }
}

Answer 10

Set setHasOptionsMenu(true) in onCreateView() method in fragment.

@Override

 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 
 {
    Viewroot=inflater.inflate(R.layout.fragment_client_requestfragment,container,false);
  hideKeyboard();
    getemail = getArguments().getString("email_id");
    Log.e("email_id from activity",getemail);
    setHasOptionsMenu(true);
    return root;
}