android - 防止选项菜单关闭 OptionItemSelected

Question

我有一个选项菜单，里面有一堆复选框。我想打开或关闭其中的一堆，但每次我只选中一个时菜单都会自动关闭。我可以在选择项目后阻止菜单关闭吗？我还想控制关闭的时间和阻止的时间。

Activity.cs(不包括与选项菜单无关的所有内容)

public class Activity: ReactiveActivity<ViewModel>, IAppCompatCallback
{

    public override bool OnCreateOptionsMenu(IMenu menu)
    {
        var inflater = MenuInflater;
        inflater.Inflate(Resource.Menu.actions, menu);
        return true;
    }

    public override bool OnOptionsItemSelected(IMenuItem item)
    {
        if(item.ItemId == Resource.Id.action_settings) {
           StartActivity(typeof(SettingsActivity));
        }
        else {
           //Code changing the view based on selections
        }
        return base.OnOptionsItemSelected(item);
    }
}

Action .xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:title="Choose options...">
  <menu>
    <group android:checkableBehavior="all">
      <item android:id="@+id/checkOption1"
            android:title="Option 1" 
            android:checked="true" />
      <item android:id="@+id/checkOption2"
            android:title="Option 2"
            android:checked="true" />
      <item android:id="@+id/checkOption3"
            android:title="Option 3"
            android:checked="true" />
      <item android:id="@+id/checkOption4"
            android:title="Option 4"
            android:checked="true" />
      <item android:id="@+id/checkOption5"
            android:title="Option 5"
            android:checked="true" />
      <item android:id="@+id/checkOption6"
            android:title="Option 6"
            android:checked="true" />
      <item android:id="@+id/checkOption7"
            android:title="Option 7"
            android:checked="true" />
    </group>
  </menu>
  </item>
  <item android:id="@+id/action_settings"
        android:title="@string/action_settings"
        android:showAsAction="never"/>
</menu>

Answer 1

I got an options menu with a bunch of checkboxes in it. I'd like to check a bunch of them on or off, but the menu closes automaticly every time I check just one. Can I prevent the menu from closing when an item has been selected? I'd also want to control when the closing happens and when it's prevented.

对于菜单，我没有找到控制关闭行为的正确方法。

但根据您的要求，Dialog 是更好的选择:

1. 删除 action.xml 中的子菜单并为 Choose Options... 添加一个 id 项目:

   <?xml version="1.0" encoding="utf-8"?>
   <menu xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:title="Choose options..." android:id="@+id/chooseOption"></item>
     <item android:id="@+id/action_settings"
           android:title="Settings"
           android:showAsAction="never"/>
   </menu>
   

2. 与 AlertDialog 一起创建您的 DialogFragment:

   public class MyDialogFragment:DialogFragment
   {
       string[] Items { get; set; }
       bool[] CheckedItems { get; set; }
   
       public MyDialogFragment(string[] items,bool[] checkedItems)
       {
           Items = items;
           checkedItems = checkedItems;
       }
       public override Dialog OnCreateDialog(Bundle savedInstanceState)
       {
           AlertDialog.Builder builder = new AlertDialog.Builder(this.Activity);
           builder.SetMultiChoiceItems(Items, CheckedItems, new DialogItemClickhandler());
           // Create the AlertDialog object and return it
           return builder.Create();
       } 
   }
   
   public class DialogItemClickhandler : Java.Lang.Object, IDialogInterfaceOnMultiChoiceClickListener
   {
       public void OnClick(IDialogInterface dialog, int which, bool isChecked)
       {
          //Item Click Implementation
       }
   }
   

3. 当用户单击 Choose Options... 菜单项时打开对话框:

   public class MainActivity : Activity
   {
       protected override void OnCreate(Bundle bundle)
       {
           base.OnCreate(bundle);
           SetContentView (Resource.Layout.Main);
       }
   
   
       public override bool OnCreateOptionsMenu(IMenu menu)
       {
           MenuInflater.Inflate(Resource.Menu.Actions, menu);
           return true;
       }
   
       public override bool OnMenuItemSelected(int featureId, IMenuItem item)
       {
           switch (item.ItemId)
           {
               case Resource.Id.chooseOption:
                   OpenDialogFragment();//Open the dialog
                   break;
               default:break;
           }
           return true;
       }
   
       private void OpenDialogFragment()
       {
   
           //init the Dialog items
           string[] items = new string[] {
               "Options 1",
               "Options 2",
               "Options 3",
               "Options 4",
               "Options 5",
               "Options 6"
           };
   
           bool[] checkedItems = new bool[] {
               true,
               false,
               true,
               false,
               true,
               false
           };
           MyDialogFragment dialog = new MyDialogFragment(items,checkedItems);
           dialog.Show(FragmentManager, "tag");
       }
   }