如何使用 xamarin.forms 从图库中为 android 和 iOS 设备选择多个图像? [英] How to select multiple images from gallery for android and iOS device using xamarin.forms?
问题描述
我正在研究 xamarin.forms.我正在创建一个可以在 Android 和 iOS 上运行的应用程序.我必须为这两种设备从图库中选择多个图像.
I am working on xamarin.forms. I am creating an app that can run on Android and iOS both. I have to select multiple images from gallery for both devices.
但是,我无法一次选择多个图像.我可以在媒体选择器 (CrossMedia
) 的帮助下选择单个图像.
But, I am unable to select multiple images at a time. I can select single image with help of media picker (CrossMedia
).
请更新我如何使用 xamarin.forms 从图库中为两台设备选择多个图像?
Please update me how I can select multiple images from gallery for both devices using xamarin.forms?
问候,阿南德·杜比
推荐答案
首先在 Xamarin Forms 中选择多张图片,你应该为每个平台做一个依赖服务.
Firstly for select multiple images in Xamarin Forms, you should do a dependency service for each platform.
在安卓中使用:
.PutExtra (Intent.ExtraAllowMultiple, true);
例如:
[assembly: Xamarin.Forms.Dependency (typeof (MediaService))]
namespace MyProject
{
public class MediaService : Java.Lang.Object, IMediaService
{
public MediaService ()
{
}
public void OpenGallery()
{
Toast.MakeText (Xamarin.Forms.Forms.Context, "Select max 20 images", ToastLength.Long).Show ();
var imageIntent = new Intent(
Intent.ActionPick);
imageIntent.SetType ("image/*");
imageIntent.PutExtra (Intent.ExtraAllowMultiple, true);
imageIntent.SetAction (Intent.ActionGetContent);
((Activity)Forms.Context).StartActivityForResult(
Intent.CreateChooser (imageIntent, "Select photo"), 0);
}
}
}
在IOS:
Install this control: ELCImagePicker
还有:
[assembly: Xamarin.Forms.Dependency (typeof (MediaService))]
namespace MyProject
{
public class MediaService: IMediaService, IMessanger
{
public MediaService ()
{
}
public void OpenGallery()
{
var picker = ELCImagePickerViewController.Instance;
picker.MaximumImagesCount = 15;
picker.Completion.ContinueWith (t => {
picker.BeginInvokeOnMainThread(()=>
{
//dismiss the picker
picker.DismissViewController(true,null);
if (t.IsCanceled || t.Exception != null) {
} else {
Util.File.Path = new List<string>();
var items = t.Result as List<AssetResult>;
foreach (var item in items) {
Util.File.Path.Add (item.Path);
}
MessagingCenter.Send<IMessanger> (this, "PostProject");
}
});
});
var topController = UIApplication.SharedApplication.KeyWindow.RootViewController;
while (topController.PresentedViewController != null) {
topController = topController.PresentedViewController;
}
topController.PresentViewController (picker, true, null);
}
}
}
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