Actionbar按钮没有显示在片段

Question

我的工具栏按钮没有显示在我试过的片段中setHasOptionsMenu（true）;。当我点击导航抽屉项目时，它会为每个片段加载新片段，我想要显示不同的操作栏按钮（通知或保存）。以下是我的代码，预先感谢。

以下是我片段码：（这是相同的导航抽屉所有碎片）

public class Company1 extends Fragment { 

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

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

    View view = inflater.inflate(R.layout.fragment_company_profile,container, false); 

    init(view); 

    btnAdd.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      showAddDialog(); 
     } 
    }); 


    return view; 
} 

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

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
     case R.id.notification: 
      break; 

    } 
    return super.onOptionsItemSelected(item); 
} 

} 

这是company_profile.xml

<menu xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" > 

    <item 
     android:id="@+id/notification" 
     android:icon="@drawable/ic_action_notification" 
     android:title="@string/mnuNotificationText" 
     app:showAsAction="always"/> 
    </menu> 

Answer 1

请检查此代码段

public class Company1 extends Fragment { 

@Override 
public void onCreate(@Nullable Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    } 

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

    View view = inflater.inflate(R.layout.fragment_company_profile,container, false); 
    setHasOptionsMenu(true); 
    init(view); 

    btnAdd.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      showAddDialog(); 
     } 
    }); 


    return view; 
} 

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

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
     case R.id.notification: 
      break; 

    } 
    return super.onOptionsItemSelected(item); 
} 
@Override 
    public void onPrepareOptionsMenu(Menu menu) { 
     //You can change menuitem property 
     //menu.findItem(R.id.notification).setVisible(true); 
     super.onPrepareOptionsMenu(menu); 

    } 
}