Question

我正在使用MvvmCross开发一个应用程序，我在android应用程序中遇到问题，设置绑定以捕获组成MvxListView项目的两个不同控件中的单击操作。 ViewModel中所有数据的绑定都可以正常工作这是我的FavouritesView的AXML

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:local="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/white">
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/LightGrey"
        android:scrollbars="vertical"
        android:scrollbarStyle="insideOverlay">
        <LinearLayout
                REMOVED FOR CLARITY    />
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">
            <Button
                style="@style/ButtonFont"
                android:text="Back"
                android:layout_width="80dp"
                android:layout_height="43dp"
                android:layout_marginTop="15dp"
                android:layout_marginLeft="12dp"
                android:background="@drawable/darkgrey_rounded_button"
                local:MvxBind="Text BackButtonText; Click CloseFragmentCommand"
                android:id="@+id/buttonBackFavourites"
                android:drawableLeft="@drawable/arrow_left"
                android:padding="8dp" />
            <TextView
                style="@style/TitleFont"
                android:text="Title"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="12dp"
                android:layout_marginLeft="12dp"
                local:MvxBind="Text TitleText"
                android:id="@+id/textTitleFavouritess" />
            <Mvx.MvxListView
                local:MvxBind="ItemsSource Favourites; ItemClick ShowFavouriteCommand"
                local:MvxItemTemplate="@layout/item_favourite"
                android:divider="@color/LightGrey"
                android:dividerHeight="10dp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:layout_marginRight="10dp"
                android:layout_marginTop="30dp"
                android:scrollbars="none"
                android:id="@+id/listFavourites" />
        </LinearLayout>
    </ScrollView>
</LinearLayout>

MvxItemTemplate就在这里：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:local="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/MidGrey">
    <TextView
        style="@style/GeneralFont"
        android:id="@+id/favItemText"
        android:text="Text line2 "
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="30dp"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:textColor="@color/DarkGrey"
        android:lines="2"
        local:MvxBind="Text Title" />
    <ImageView
        android:id="@+id/favItemImage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="24dp"
        android:layout_marginRight="10dp"
        android:tint="@color/DarkGrey"
        android:src="@drawable/arrow_right" />
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:id="@+id/viewFavSpacer"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:layout_marginTop="8dp"
        android:layout_marginBottom="8dp"
        android:layout_below="@+id/favItemText"
        android:background="@color/DarkGrey" />
    <Button
        android:text="(x) Remove"
        android:layout_below="@+id/viewFavSpacer"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:textColor="@color/DarkGrey"
        android:textSize="12dp"
        android:background="@color/MidGrey"
        local:MvxBind="Text 'RemoveFromFavourites', Converter=UseTextService; Click DeleteFavouriteMessage(.)"
        android:layout_marginBottom="8dp"
        android:layout_marginLeft="10dp" />
</RelativeLayout>

这是我的FavouritesViewModel：

using System;
using Cirrious.MvvmCross.Plugins.Messenger;
using MyApp.Core.Managers;
using MyApp.Core.Services;
using System.Collections;
using MyApp.Core.Domain;
using System.Collections.Generic;
using Cirrious.MvvmCross.ViewModels;
using System.Collections.ObjectModel;
using System.ServiceModel.Channels;
using Cirrious.CrossCore;
using MyApp.Core.Messages;
using MyApp.Core.Helpers;

namespace MyApp.Core.ViewModels
{
    public class FavouritesViewModel: StandardsViewModel
    {
        private IFavouritesService _favouritesService;

        public FavouritesViewModel (ITextService textService, IMvxMessenger messenger, ISettingsManager settingsManager, IPageService pageService, IFavouritesService favouriteService): base(textService, messenger, settingsManager, pageService)
        {
            _logger.LeaveBreadcrumb ("FavouritesViewModel" , "Constructor");

            _favouritesService = favouriteService;
        }

        public string TitleText { get { return _textService.GetString("Favourites"); } }


        private ObservableCollection<Favourite> _favourites;
        public ObservableCollection<Favourite> Favourites
        {
            get { return _favourites; }
            set {
                _favourites = value;
                RaisePropertyChanged (()=>Favourites);
            }
        }

        public async new void Init()
        {
            _logger.LeaveBreadcrumb ("FavouritesViewModel" , "Init");

            var messenger = Mvx.Resolve<IMvxMessenger> ();
            messenger.Subscribe<DeleteFavouriteMessage>(message => {
                DeleteFavourite (message.ThisFavourite);
            });

            var favs = await _favouritesService.GetAll ();
            _logger.LeaveBreadcrumb ("FavouritesViewModel:Init", "Favourites found:" + favs.Count.ToString ());
            Favourites = new ObservableCollection<Favourite> (favs);
        }


        /// <summary>
        /// Deletes the favourite.
        /// </summary>
        /// <param name="favourite">Favourite.</param>
        public void DeleteFavourite(Favourite favourite)
        {
            _logger.LeaveBreadcrumb ("FavouritesViewModel:DeleteFavourite", favourite.Title);

            Favourites.Remove (favourite);
            RaisePropertyChanged ("Favourites");
            _favouritesService.Delete (favourite);
        }


        /// <summary>
        /// The delete favourite command.
        /// </summary>
        private MvxCommand<Favourite> _deleteFavouriteCommand;

        /// <summary>
        /// Gets the delete favourite command.
        /// </summary>
        /// <value>The delete favourite command.</value>
        public MvxCommand<Favourite> DeleteFavouriteCommand
        {
            get
            {
                _deleteFavouriteCommand = _deleteFavouriteCommand ?? new MvxCommand<Favourite> (DeleteFavourite);
                return _deleteFavouriteCommand;
            }
        }


        public void ShowFavourite(Favourite favourite)
        {
            if (favourite != null)
            {
                _logger.LeaveBreadcrumb (string.Format("FavouriteViewModel - Selected : {0}", favourite.Title));
                // TODO need to display the favourite piece of info
            }
        }

        private MvxCommand<Favourite> _showFavouriteCommand;
        public MvxCommand<Favourite> ShowFavouriteCommand
        {
        get
            {
                _showFavouriteCommand = _showFavouriteCommand ?? new MvxCommand<Favourite> (ShowFavourite);
                return _showFavouriteCommand;
            }
        }

        public string ButtonRemoveText { get { return _textService.GetString ("RemoveFromFavourites"); } }
        public string AreYouSureText { get { return _textService.GetString ("AreYouSure"); } }
        public string RemoveFavouriteText { get { return _textService.GetString ("RemoveFavourite"); } }
    }
}

我的问题的症状是，当＆＃34;（x）删除＆＃34;时，View会收到DeleteFavouriteMessage。单击按钮。单击该项时，不会从MvxListView触发ItemClick事件ShowFavouriteCommand。

我确信我正在做某事，或者遗漏了一些简单的事情，但我正在努力取得任何进展。

Answer 1

我之前遇到过这个。 MvxItemTemplate布局中的按钮正在窃取焦点。尝试为布局中的按钮设置android:focusable="false"。

Changing focus from Button in ListView row to list item

我正在更新此答案以使其更加彻底。在android:focusable="false"项目中为常用Button控件设置ListView可解决此问题。如果您使用的是ImageButton，则无效。

对于ImageButton，您需要在布局的根视图上设置android:descendantFocusability="blocksDescendants"。

请在此处查看已接受的答案：can't click on listview row with imagebutton

Answer 2

我认为你遗失了android:choiceMode="singleChoice"

<Mvx.MvxListView
                local:MvxBind="ItemsSource Favourites; ItemClick ShowFavouriteCommand"
                ...
                android:choiceMode="singleChoice"
                android:id="@+id/listFavourites" />

MvvmCross - MvxListView绑定多次点击

2 个答案: