c# - 将图像传递到 Android ListView ArrayAdapter

Question

我有一个 ListView，我正在使用 ArrayAdapter 将值传递给这个列表。这就是我所做的。

首先我创建了字符串数组:

private static readonly string[] menuItemNames = new string[] {
    "Home", "New", "Delete", "Submit", "Help"
};

然后创建ArrayAdapter:

this.MyMenuList.Adapter = new ArrayAdapter<string> (this, Resource.Layout.item_menu, Resource.Id.MenuItemText, menuItemNames);

这似乎工作正常。 menuItemNames 数组中的值进入列表并创建一个新项目。但是在每个项目旁边，我都有一个图标。如何设置每个图标？

这是我尝试过的:

Drawable sideIcon1 = context.Resources.GetDrawable (Resource.Drawable.home_icon);
Drawable sideIcon2 = context.Resources.GetDrawable (Resource.Drawable.new_icon);
Drawable sideIcon3 = context.Resources.GetDrawable (Resource.Drawable.delete_icon);
Drawable sideIcon4 = context.Resources.GetDrawable (Resource.Drawable.submit_icon);
Drawable sideIcon5 = context.Resources.GetDrawable (Resource.Drawable.help_icon);

然后，制作可绘制数组:

Drawable[] sideMenuItemIconsDrawables = new Drawable[] {
    sideIcon1, sideIcon2, sideIcon3, sideIcon4, sideIcon5
};

然后创建一个新的 ArrayAdapter:

this.MyMenuList.Adapter = new ArrayAdapter<Drawable> (this, Resource.Layout.item_menu, Resource.Id.ImgView, sideMenuItemIconsDrawables);

这似乎行不通。我需要传递什么而不是 drawable 来更改 ImageView 的图像？

感谢您的宝贵时间。

//============================================= ==============

编辑:所以这就是我尝试过的。但它甚至在 View 加载之前就让我的应用程序崩溃了。适配器数量发生变化，但在那之后它就崩溃了。

        IList<IDictionary<string, object>> menuItemNames = new List<IDictionary<string, object>> ();

        Dictionary<string, object> sideItem1 = new Dictionary<string, object> ();
        sideItem1.Add ("text", "SideMenuItem1");
        sideItem1.Add ("icon", Resource.Drawable.menu_Icon);

        Dictionary<string, object> sideItem2 = new Dictionary<string, object> ();
        sideItem2.Add ("text", "SideMenuItem2");
        sideItem2.Add ("icon", Resource.Drawable.back_arrow_box);

        Dictionary<string, object> sideItem3 = new Dictionary<string, object> ();
        sideItem3.Add ("text", "SideMenuItem3");
        sideItem3.Add ("icon", Resource.Drawable.bar_addAbsence);

        Dictionary<string, object> sideItem4 = new Dictionary<string, object> ();
        sideItem4.Add ("text", "SideMenuItem4");
        sideItem4.Add ("icon", Resource.Drawable.bar_addExpense);

        Dictionary<string, object> sideItem5 = new Dictionary<string, object> ();
        sideItem5.Add ("text", "SideMenuItem5");
        sideItem5.Add ("icon", Resource.Drawable.bar_addTime);

        menuItemNames.Add (sideItem1);
        menuItemNames.Add (sideItem2);
        menuItemNames.Add (sideItem3);
        menuItemNames.Add (sideItem4);
        menuItemNames.Add (sideItem5);

        string[] sideMenuFromArr = { "text", "icon" };

        int[] sideMenuToArr = { Resource.Id.textSideMenuItem, Resource.Id.imgViewSideMenuItemIcon };

        SimpleAdapter sideMenuListAdapter = new SimpleAdapter (context, menuItemNames, Resource.Layout.item_menu, sideMenuFromArr, sideMenuToArr);
        this.absHomeSideMenuList.Adapter = sideMenuListAdapter;

Answer 1

有几种方法可以解决这个问题，对我来说，我认为使用 SimpleAdapter 是最简单的方法。制作字符串和对象的 HashMap 列表。创建您的布局，使用您希望使用的文本和图标填充您的列表，并将布局和列表传递给您的 SimpleAdapter 构造函数。像这样的东西:

    List<HashMap<String, Object>> menuItemNames = new ArrayList<HashMap<String,Object>>();
    HashMap<String, Object> row = new HashMap<String, Object>();
    row.put("icon", R.drawable.home_icon);
    row.put("text", "Home");
    menuItemNames.add(row);
    row = new HashMap<String, Object>();
    row.put("icon", android.R.drawable.new_icon);
    row.put("text", "New");
    menuItemNames.add(row);
    row = new HashMap<String, Object>();
    row.put("icon", android.R.drawable.delete_icon);
    row.put("text", "Delete");
    menuItemNames.add(row);

    int[] to = {R.id.sideMenuItemIconsDrawables, R.id.MenuItemText}; //IDs of your text and icon
    String[] from = {"icon", "text"};

    adapter = new SimpleAdapter(this, menuItemNames, R.layout.item_menu, from, to);
    listView.setAdapter(adapter);

希望对您有所帮助。