MvvmCross Android Bind Image from byte[] [英] MvvmCross Android Bind Image from byte[]

问题描述

有谁知道如何在 axml 视图中将 byte[](图像)绑定到 Image 控件.我的 ViewModel 继承自 MvxViewModel.我所有其他绑定都很好用，但我找不到绑定该图像的方法.

Does anyone know how to bind a byte[] (image) to a Image control in a axml view. My ViewModel inherit from MvxViewModel. All my other bindings works great but I cannot find a way to bind that image.

推荐答案

我认为您可以使用自定义 UI 控件绑定它.

I think you could bind this using a custom UI control.

为此，您需要执行以下操作:

To do this, you'll need to do something like:

1. 从 ImageView
继承一个新的 MyImageView
2. 添加默认构造函数(将上下文和属性向下传递给基本构造函数)

3. 向 MyImageView 添加一个新的 RawImage 属性，实现为:

1. inherit a new MyImageView from ImageView
2. add the default constructor (which passes the context and attributes down to the base constructor)

3. add a new RawImage property to MyImageView, implementing it as:

private byte[] _rawImage;
public byte[] RawImage
{
     get { return _rawImage; }
     set 
     {
             _rawImage = value;
             if (_rawImage == null)
                     return;

             var bitmap = BitmapFactory.DecodeByteArray(_rawImage, 0,_rawImage.Length);
             SetImageBitmap(bitmap);
     }
}

然后您可以在 axml 中使用 MyImageView 控件而不是普通的 ImageView.

You can then use that MyImageView control in your axml instead of the normal ImageView.

注意——上面的这段代码没有经过测试——但是一旦你在视图中得到了字节[]，我相信你会弄清楚要使用什么 Droid 代码.

Note - this code above not tested - but once you get the byte[] in the View I'm sure you'll work out what Droid code to use.

作为替代方法，您还可以使用自定义绑定将 byte[] 绑定到普通的 ImageView - 请参阅 byte[] 中的自定义绑定示例a href="https://stackoverflow.com/questions/10700445/in-mvvmcross-how-do-i-do-custom-bind-properties/">在 MvvmCross 中如何自定义绑定属性

As an alternative approach to this, you could also use a custom binding to bind a byte[] to a normal ImageView - see an example of custom binding in In MvvmCross how do I do custom bind properties

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