c# - 绑定(bind)按钮路径图片(使用MvxBaseAndroidTargetBinding)Android

Question

如何使用 MvxBaseAndroidTargetBinding 将路径图像绑定(bind)到按钮？

1)我创建一个绑定(bind)

public class MvxButtonIconBinding: MvxBaseAndroidTargetBinding
{
    private readonly View _view;

public MvxButtonIconBinding(View view)
{
    _view = view;
}

public override void SetValue(object value)
{
    string path = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
    path = Path.Combine(path, "pictures");
    path = Path.Combine(path, (string)value);
    if (File.Exists(path))
    {
        var dr = Drawable.CreateFromPath(path);
        Button b = _view as Button;
        var drawables = b.GetCompoundDrawables();
        foreach (var d in drawables)
            if (d!=null)
                d.Dispose(); // To avoid "out of memory" messages
        b.SetCompoundDrawablesWithIntrinsicBounds(null, dr, null, null);
    }
    else
    {
        Console.WriteLine("File {0} does not exists", path);
    } 
}

public override MvxBindingMode DefaultMode
{
    get { return MvxBindingMode.OneWay; }
}

public override Type TargetType
{
    get { return typeof(string); }
}

protected override void Dispose(bool isDisposing)
{
    if (isDisposing)
    {
    }
    base.Dispose(isDisposing);
}

2) 设置绑定(bind):

registry.RegisterFactory(new MvxCustomBindingFactory<View>("ButtonIcon", view => new MvxButtonIconBinding(view)));

3) 创建button_list.аxml

<Button
android:id="@+id/ButtonArticle"
android:layout_width="fill_parent"
android:layout_height="160dp"
android:gravity="bottom|center"
android:paddingBottom="5dp"
android:paddingTop="5dp"
local:MvxBind="{'Click':{'Path':'Command1'},'ButtonIcon':{'Path':'Item.PictureFileName'}}"
android:textSize="14dip"
android:textColor="@drawable/ToggleButtonSelector" />

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哪个路径传输属性PictureFileName？请给我举个例子。

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Taken from

Answer 1

根据您的代码，图片应位于:

string path = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
path = Path.Combine(path, "pictures");
path = Path.Combine(path, (string)value);

因此，如果您的输入值 Item.PictureFileName 是“icon1.png”，那么您需要将图像保存在:

/data/data/YOUR_APP_NAME/files/pictures/icon1.png

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我根据 Database File Location for SQLite within MonoDroid 中关于System.Environment.SpecialFolder.Personal 的信息解决了这个问题|

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如果您使用的是固定图标集(不是下载或动态创建图像)，那么最好使用像 the conference sample 中的 SetButtonBackground 中所示的 resourceId 方法。