任何人都可以点我的例子拍摄照片，并使用储存 MVVMCross
我一直在寻找，但只发现了这一点：
Monodroid采取与相机图片（不实施MVVMCross）
视频录制（它的视频，我不能使它发挥作用：S）
的Oficialy配方实例（它的工作原理，但没有实现MVVMCross）
谢谢！
解决！谢谢！ 要备将来参考：（使用主科） 的积分斯图尔特，我只是改变了code与我的实际工作的
使用Cirrious.MvvmCross.ExtensionMethods;
使用Cirrious.MvvmCross.Interfaces.Platform.Tasks;
使用Cirrious.MvvmCross.Interfaces.ServiceProvider;
使用SIGEP.DummyService;
使用SIGEP.Mobile.Core.Interfaces;
命名空间SIGEP.Mobile.Core.Models
{
公共类照片服务：IMvxServiceConsumer＆LT; IMvxPictureChooserTask＆GT;
{
私人const int的MaxPixelDimension = 1024;
私人const int的DefaultJpegQuality = 92;
公共无效GetNewPhoto（）
{
this.GetService＆LT; IMvxPictureChooserTask＆GT;（）TakePicture（。
MaxPixelDimension，
DefaultJpegQuality，
HandlePhotoAvailable，
（）=＆GT; {/ *取消被忽略* /}）;
}
公共事件的EventHandler＆LT; PhotoStreamEventArgs＆GT; PhotoStreamAvailable;
私人无效HandlePhotoAvailable（流pictureStream）
{
VAR处理器= PhotoStreamAvailable;
如果（处理！= NULL）
{
处理程序（这一点，新PhotoStreamEventArgs（）{PictureStream = pictureStream，OnSucessGettingPhotoFileName = OnSucessGettingPhotoFileName}）;
}
}
公共静态无效TakePhoto（动作＆LT;字符串＆GT; successFileName，动作＆LT;异常＆GT;错误）
{
VAR的服务=新的照片服务（）;
service.OnSucessGettingPhotoFileName = successFileName;
service.OnError =错误;
service.GetNewPhoto（）;
service.PhotoStreamAvailable + =新的EventHandler＆LT; PhotoStreamEventArgs＆GT;（service_PhotoStreamAvailable）;
}
静态无效service_PhotoStreamAvailable（对象发件人，PhotoStreamEventArgs E）
{
// Grava酒店PRA ficheiro！
var目录= Environment.GetFolderPath（Environment.SpecialFolder.MyDocuments）;
变种文件名= Path.Combine（目录，photo.jpeg）;
字符串saveTo =文件名;
的FileStream writeStream =新的FileStream（saveTo，FileMode.Create，FileAccess.Write）;
ReadWriteStream（e.PictureStream，writeStream）;
e.OnSucessGettingPhotoFileName（文件名）;
}
私有静态无效ReadWriteStream（流readStream，流writeStream）
{
INT长度= 256;
字节[]缓冲区=新的字节[长度];
INT读取动作= readStream.Read（缓冲液，0，长度）;
//写所需的字节
而（读取动作大于0）
{
writeStream.Write（缓冲液，0，读取动作）;
读取动作= readStream.Read（缓冲液，0，长度）;
}
readStream.Close（）;
writeStream.Close（）;
}
公益行动＆LT;字符串＆GT; OnSucessGettingPhotoFileName {获得;组; }
公益行动＆LT;异常＆GT;的OnError {获得;组; }
}
[可序列化]
[标记有ComVisible特性（真）
公共类PhotoStreamEventArgs：EventArgs的
{
公共流PictureStream {获得;组; }
公益行动＆LT;字符串＆GT; OnSucessGettingPhotoFileName {获得;组; }
}
}
解决方案
我通常使用内置的 IMvxPictureChooserTask （这是一个插件，如果使用vNext实现服务）：
使用Cirrious.MvvmCross.ExtensionMethods;
使用Cirrious.MvvmCross.Interfaces.Platform.Tasks;
使用Cirrious.MvvmCross.Interfaces.ServiceProvider;
公共类照片服务
：IMvxServiceConsumer＆LT; IMvxPictureChooserTask＆GT;
，IPhotoService
{
私人const int的MaxPixelDimension = 1024;
私人const int的DefaultJpegQuality = 92;
公共无效GetNewPhoto（）
{
Trace.Info（获取新的照片开始了。）;
this.GetService＆LT; IMvxPictureChooserTask＆GT;（）TakePicture（。
MaxPixelDimension，
DefaultJpegQuality，
HandlePhotoAvailable，
（）=＆GT; {/ *取消被忽略* /}）;
}
公共事件的EventHandler＆LT; PhotoStreamEventArgs＆GT; PhotoStreamAvailable;
私人无效HandlePhotoAvailable（流pictureStream）
{
Trace.Info（提供图片）;
VAR处理器= PhotoStreamAvailable;
如果（处理！= NULL）
{
处理程序（这一点，新PhotoStreamEventArgs（）{PictureStream = pictureStream}）;
}
}
}
我一般注册该服务在启动期间一个单，然后从一个ViewModel的ICommand处理程序调用它。
一个应用程序，它使用该服务的 Blooor 样本 - 见 BaseEditProductViewModel.cs - 这是不是一个样我有什么关系，但我相信它带来了两个拍照和ZXing - 两者都使用外部服务
一个警告：在MonoDroid，你可以看到一些奇怪的/出乎意料活动/视图模型的生命周期行为 - 基本上你可以看到，活动你从被卸载/照片在拍照从内存抹去。如果发生这种情况，您的应用程序，那么你可能需要开始寻找这样的问题：节能活动状态在Android的 - 这不是自动MvvmCross（还）办理
。我相信Blooor样品可能受到这个问题 - 但用户是否会永远看到它在正常的应用程序使用的是值得商榷的。
。作为替代 IMvxPictureChooserTask 服务，您也可以看看使用一些从Xamarin.Mobile跨平台API - 看MvvmCross vnext：monodroid使用VideoView插件里面一个可能的起点 - 或为Android只有你可以很容易地实现自己的
Can anyone point me to an example of take a Photo and store it using MVVMCross?
I have been searching but only have found this:
Monodroid Take a picture with Camera (Doesn't Implement MVVMCross)
Video Recording (It's Video and i can't make it work :S)
The Oficialy Recipe Example (It Works but does not implement MVVMCross)
Thanks!!!
Resolved! Thanks! To Future References: (Using Master Branch) Credits to Stuart, I just changed the code to work with my reality
using Cirrious.MvvmCross.ExtensionMethods;
using Cirrious.MvvmCross.Interfaces.Platform.Tasks;
using Cirrious.MvvmCross.Interfaces.ServiceProvider;
using SIGEP.DummyService;
using SIGEP.Mobile.Core.Interfaces;
namespace SIGEP.Mobile.Core.Models
{
public class PhotoService : IMvxServiceConsumer<IMvxPictureChooserTask>
{
private const int MaxPixelDimension = 1024;
private const int DefaultJpegQuality = 92;
public void GetNewPhoto()
{
this.GetService<IMvxPictureChooserTask>().TakePicture(
MaxPixelDimension,
DefaultJpegQuality,
HandlePhotoAvailable,
() => { /* cancel is ignored */ });
}
public event EventHandler<PhotoStreamEventArgs> PhotoStreamAvailable;
private void HandlePhotoAvailable(Stream pictureStream)
{
var handler = PhotoStreamAvailable;
if (handler != null)
{
handler(this, new PhotoStreamEventArgs() { PictureStream = pictureStream, OnSucessGettingPhotoFileName = OnSucessGettingPhotoFileName });
}
}
public static void TakePhoto(Action<string> successFileName, Action<Exception> error)
{
var service = new PhotoService();
service.OnSucessGettingPhotoFileName = successFileName;
service.OnError = error;
service.GetNewPhoto();
service.PhotoStreamAvailable += new EventHandler<PhotoStreamEventArgs>(service_PhotoStreamAvailable);
}
static void service_PhotoStreamAvailable(object sender, PhotoStreamEventArgs e)
{
//grava pra ficheiro!!!
var directory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
var filename = Path.Combine(directory, "photo.jpeg");
string saveTo = filename;
FileStream writeStream = new FileStream(saveTo, FileMode.Create, FileAccess.Write);
ReadWriteStream(e.PictureStream, writeStream);
e.OnSucessGettingPhotoFileName(filename);
}
private static void ReadWriteStream(Stream readStream, Stream writeStream)
{
int Length = 256;
Byte[] buffer = new Byte[Length];
int bytesRead = readStream.Read(buffer, 0, Length);
// write the required bytes
while (bytesRead > 0)
{
writeStream.Write(buffer, 0, bytesRead);
bytesRead = readStream.Read(buffer, 0, Length);
}
readStream.Close();
writeStream.Close();
}
public Action<string> OnSucessGettingPhotoFileName { get; set; }
public Action<Exception> OnError { get; set; }
}
[Serializable]
[ComVisible(true)]
public class PhotoStreamEventArgs : EventArgs
{
public Stream PictureStream { get; set; }
public Action<string> OnSucessGettingPhotoFileName { get; set; }
}
}
解决方案
I generally implement a service using the built-in IMvxPictureChooserTask (this is in a Plugin if using vNext):
using Cirrious.MvvmCross.ExtensionMethods;
using Cirrious.MvvmCross.Interfaces.Platform.Tasks;
using Cirrious.MvvmCross.Interfaces.ServiceProvider;
public class PhotoService
: IMvxServiceConsumer<IMvxPictureChooserTask>
, IPhotoService
{
private const int MaxPixelDimension = 1024;
private const int DefaultJpegQuality = 92;
public void GetNewPhoto()
{
Trace.Info("Get a new photo started.");
this.GetService<IMvxPictureChooserTask>().TakePicture(
MaxPixelDimension,
DefaultJpegQuality,
HandlePhotoAvailable,
() => { /* cancel is ignored */ });
}
public event EventHandler<PhotoStreamEventArgs> PhotoStreamAvailable;
private void HandlePhotoAvailable(Stream pictureStream)
{
Trace.Info("Picture available");
var handler = PhotoStreamAvailable;
if (handler != null)
{
handler(this, new PhotoStreamEventArgs() { PictureStream = pictureStream });
}
}
}
I generally register this service as a singleton during startup, and then call it from a ViewModel ICommand handler.
One app which uses this service is the Blooor sample - see BaseEditProductViewModel.cs - this isn't a sample I had anything to do with, but I believe it brings in both Picture taking and ZXing - both using external services.
One warning: On MonoDroid, you can see some strange/unexpected Activity/ViewModel lifecycle behaviour - basically you can see that the Activity you take the photo from is unloaded/wiped from memory during the photo taking. If this happens to your app then you'll probably need to start looking at questions like: Saving Activity state in Android - this isn't automatically handled in MvvmCross (yet).
I believe the Blooor sample might suffer from this issue - but whether a user would ever see it in normal app use is debatable.
As an alternative to the IMvxPictureChooserTask service, you can also look at using some of the cross-platform APIs from Xamarin.Mobile - see MvvmCross vnext : monodroid use a VideoView inside a plugin for a possible starting place - or for Android only you can easily implement your own.
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