android - 菜單項未顯示在操作欄中

Question

我正在嘗試在操作欄中添加菜單項「完成」。我只是複製並修改了其他菜單項顯示的活動中的代碼。所以它應該正常工作。

這裏的活動佈局：

<?xml version="1.0" encoding="utf-8"?> 
<android.support.design.widget.CoordinatorLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <android.support.design.widget.AppBarLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content"> 
     <android.support.v7.widget.Toolbar 
      android:id="@+id/toolbar" 
      android:layout_width="match_parent" 
      android:layout_height="?attr/actionBarSize" 
      android:background="@color/md_blue_600" 
      android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" 
      app:popupTheme="@style/ThemeOverlay.AppCompat.Light" 
      app:layout_scrollFlags="scroll|enterAlways"/> 
    </android.support.design.widget.AppBarLayout> 


    <LinearLayout 
     android:id="@+id/activity_credits" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:background="#fff" 
     android:paddingBottom="@dimen/activity_vertical_margin" 
     android:paddingLeft="@dimen/activity_horizontal_margin" 
     android:paddingRight="@dimen/activity_horizontal_margin" 
     android:paddingTop="@dimen/activity_vertical_margin" 
     android:orientation="vertical" 
     app:layout_behavior="@string/appbar_scrolling_view_behavior" 
     tools:mContext="com.getsaveit.saveit.activities.CreditsActivity"> 


     <TextView 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:textStyle="bold" 
      android:textSize="18sp" 
      android:layout_marginBottom="@dimen/activity_vertical_margin" 
      android:text="@string/affiliator_category"/> 

     <com.toptoche.searchablespinnerlibrary.SearchableSpinner 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      app:hintText="Select category" 
      android:id="@+id/affiliator_category_spinner"/> 

     <ExpandableListView 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="@drawable/rectangular_shap" 
      android:id="@+id/affiliators_listview"/> 
    </LinearLayout> 

</android.support.design.widget.CoordinatorLayout> 

而且choose_affiliator_menu.xml文件：

和Java代碼本身：

public class CreditsActivity extends AppCompatActivity { 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_credits); 

     Toolbar actionBar = (Toolbar) findViewById(R.id.toolbar); 
     actionBar.setTitle("Memberships"); 

     //.... 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     getMenuInflater().inflate(R.menu.choose_affiliator_menu, menu); 
     return true; 
    } 
} 

Answer 1

您應工具欄的初始化後使用下面的方法。

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar);