Xamarin.forms Xamarin表单：如何在从gallery或camera中选择图片后实现图像裁剪
我正在使用打开相机和图库来选择图片。选择图片后，我需要在UI上设置它之前对其进行裁剪。我在相机中尝试过Xamarin.forms Xamarin表单：如何在从gallery或camera中选择图片后实现图像裁剪,xamarin.forms,camera,gallery,Xamarin.forms,Camera,Gallery,我正在使用打开相机和图库来选择图片。选择图片后，我需要在UI上设置它之前对其进行裁剪。我在相机中尝试过AllowCropping=true，但它只适用于windows和ios。对于所有平台（android、ios和windows）上的android和gallery中的摄像头，没有裁剪选项 我试着用软件包实现图像裁剪功能 我的代码： //Camera async void CameraClick() { try { await CrossMedia.Current.
AllowCropping=true//Camera
async void CameraClick()
{
try
{
await CrossMedia.Current.Initialize();
if (!CrossMedia.Current.IsCameraAvailable || !CrossMedia.Current.IsTakePhotoSupported)
{
if (!Utility.IsWindowsDevice())
{
await DisplayAlert("Alert", "No camera available.", "Ok");
}
else
{
ShowAlert("No camera available.");
}
return;
}
_mediaFile = await CrossMedia.Current.TakePhotoAsync(new Plugin.Media.Abstractions.StoreCameraMediaOptions
{
Directory = "Sample",
Name = "test.jpg",
AllowCropping = true,
PhotoSize = PhotoSize.Medium
});
if (_mediaFile == null)
return;
profilephoto.Source = ImageSource.FromStream(() =>
{
isPicture = true;
isAvatar = false;
if (Device.OS == TargetPlatform.iOS)
{
return _mediaFile.GetStreamWithImageRotatedForExternalStorage();
}
else
{
return _mediaFile.GetStream();
}
});
new ImageCropper()
{
PageTitle = "Test Title",
AspectRatioX = 1,
AspectRatioY = 1,
CropShape = ImageCropper.CropShapeType.Rectangle,
SelectSourceTitle = "Select source",
TakePhotoTitle = "Take Photo",
PhotoLibraryTitle = "Photo Library",
Success = (imageFile) =>
{
Device.BeginInvokeOnMainThread(() =>
{
profilephoto.Source = ImageSource.FromFile(imageFile);
});
}
}.Show(this);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Exception:>" + ex);
}
}
//Gallery
async void GalleryClick()
{
try
{
await CrossMedia.Current.Initialize();
if (!CrossMedia.Current.IsPickPhotoSupported)
{
if (!Utility.IsWindowsDevice())
{
await DisplayAlert("Alert", "No photos available.", "Ok");
}
else
{
ShowAlert("No photos available.");
}
return;
}
_mediaFile = await CrossMedia.Current.PickPhotoAsync(new PickMediaOptions
{
PhotoSize = PhotoSize.Medium
});
if (_mediaFile == null)
return;
profilephoto.Source = ImageSource.FromStream(() =>
{
isPicture = true;
isAvatar = false;
return _mediaFile.GetStream();
});
new ImageCropper()
{
PageTitle = "Test Title",
AspectRatioX = 1,
AspectRatioY = 1,
CropShape = ImageCropper.CropShapeType.Rectangle,
SelectSourceTitle = "Select source",
TakePhotoTitle = "Take Photo",
PhotoLibraryTitle = "Photo Library",
Success = (imageFile) =>
{
Device.BeginInvokeOnMainThread(() =>
{
profilephoto.Source = ImageSource.FromFile(imageFile);
});
}
}.Show(this);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Exception:>" + ex);
}
}
不知道这背后的问题是什么。是否有其他简单的软件包来实现图像裁剪功能？首先，将ImageCropper.Forms.Fix.v2nuget软件包添加到您的项目中 然后，如果您使用
AndroidX<application android:label="ImageCropDemo.Android" android:theme="@style/MainTheme">
<activity android:name="com.theartofdev.edmodo.cropper.CropImageActivity"
android:theme="@style/Base.Theme.AppCompat"/>
<provider android:name="androidx.core.content.FileProvider"
android:authorities="${applicationId}.fileprovider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths"></meta-data>
</provider>
</application>
不使用ImageCropper.Forms软件包是否有效？您可以共享您的示例，这样我就可以对其进行测试。@LucasZhang MSFT我将准备示例并尽快与您共享。您可以在mainpage.xaml.cs中添加完整的代码吗？发布它。当使用插件ImageCropper时，您不需要再使用MediaPlugin，因为ImageCropper已经包含了它。但是您仍然需要安装并初始化MediaPlugin。OnClickedRectangle是一个按钮单击事件。是否可以将最终图像值设置为MediaFile？因为我需要将所选图像发布到服务器，如下所示：“content.Add（newstreamcontent（\u mediaFile.GetStream（）），“\”file\”，$“\”{u mediaFile.Path}\”；”目前我使用了{u mediaFile.GetStream（）和{u mediaFile.Path值。
namespace ImageCropDemo
{
public partial class MainPage : ContentPage
{
private MediaFile _mediaFile;
public MainPage()
{
InitializeComponent();
CrossMedia.Current.Initialize();
}
protected void OnClickedRectangle(object sender, EventArgs e)
{
new ImageCropper()
{
// PageTitle = "Test Title",
// AspectRatioX = 1,
// AspectRatioY = 1,
Success = (imageFile) =>
{
Device.BeginInvokeOnMainThread(() =>
{
image.Source = ImageSource.FromFile(imageFile);
});
}
}.Show(this);
}
async void OpenCamera(object sender, EventArgs args)
{
try
{
await CrossMedia.Current.Initialize();
//if (!CrossMedia.Current.IsCameraAvailable || !CrossMedia.Current.IsTakePhotoSupported)
//{
// await DisplayAlert("Alert", "No camera available.", "Ok");
// return;
//}
//_mediaFile = await CrossMedia.Current.TakePhotoAsync(new Plugin.Media.Abstractions.StoreCameraMediaOptions
//{
// Directory = "Sample",
// Name = "test.jpg",
// AllowCropping = true,
// PhotoSize = PhotoSize.Medium
//});
//if (_mediaFile == null)
// return;
//image.Source = ImageSource.FromStream(() =>
//{
// if (Device.OS == TargetPlatform.iOS)
// {
// return _mediaFile.GetStreamWithImageRotatedForExternalStorage();
// }
// else
// {
// return _mediaFile.GetStream();
// }
//});
new ImageCropper()
{
PageTitle = "Test Title",
AspectRatioX = 1,
AspectRatioY = 1,
CropShape = ImageCropper.CropShapeType.Rectangle,
SelectSourceTitle = "Select source",
TakePhotoTitle = "Take Photo",
PhotoLibraryTitle = "Photo Library",
Success = (imageFile) =>
{
Device.BeginInvokeOnMainThread(() =>
{
image.Source = ImageSource.FromFile(imageFile);
});
}
}.Show(this);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("CameraException:>" + ex);
}
}
string imagefile;
async void OpenGallery(object sender, EventArgs args)
{
try
{
await CrossMedia.Current.Initialize();
//if (!CrossMedia.Current.IsPickPhotoSupported)
//{
// await DisplayAlert("Alert", "No photos available.", "Ok");
// return;
//}
//_mediaFile = await CrossMedia.Current.PickPhotoAsync(new PickMediaOptions
//{
// PhotoSize = PhotoSize.Medium
//});
//if (_mediaFile == null)
// return;
//image.Source = ImageSource.FromStream(() =>
//{
// return _mediaFile.GetStream();
//});
new ImageCropper()
{
PageTitle = "Test Title",
AspectRatioX = 1,
AspectRatioY = 1,
CropShape = ImageCropper.CropShapeType.Rectangle,
SelectSourceTitle = "Select source",
TakePhotoTitle = "Take Photo",
PhotoLibraryTitle = "Photo Library",
Success = (imageFile) =>
{
Device.BeginInvokeOnMainThread (() =>
{
image.Source = ImageSource.FromFile(imageFile);
imagefile = imageFile;
});
}
}.Show(this);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("GalleryException:>" + ex);
}
}
}
}