如何解决如何从另一个名称空间调用方法并传递数据
我想传递一个SKImage和一个字符串文件名,以将图片保存到手机目录中。
我要调用的方法:
namespace LevelMeter.Droid
{
public class SaveImage_Droid : SaveImage
{
public SaveImage_Droid(SKImage snapshot,string fileName)
{
SaveImage(snapshot,fileName);
}
public void SaveImage(SKImage snapshot,string fileName)
{
var pictures = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryPictures).AbsolutePath;
Bitmap bm = snapshot.ToBitmap();
var filePath = System.IO.Path.Combine(pictures,fileName);
var stream = new FileStream(filePath,FileMode.Create);
bm.Compress(Bitmap.CompressFormat.Jpeg,90,stream);
stream.Flush();
stream.Close();
}
}
}
我创建了这个界面:
namespace LevelMeter
{
public interface SaveImage
{
void SaveImage(SKImage snapshot,string fileName);
}
}
我想从这里打电话
namespace LevelMeter.Views
{
public void SaveButton_Clicked(object sender,EventArgs e)
{
SKImage snapshot = surface.Snapshot();
string fileName = System.DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg";
SaveImage(snapshot,fileName); //I cant't reach it
}
}
解决方法
您可以使用DependencyService将方法从共享项目调用到.Android
项目:
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
}
public void SaveButton_Clicked(object sender,EventArgs e)
{
SKImage snapshot = surface.Snapshot();
string fileName = System.DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg";
DependencyService.Get<ISaveImage>().SaveImage(snapshot,fileName);
}
}
public interface ISaveImage
{
void SaveImage(SKImage snapshot,string fileName);
}
然后在Android项目中注册:Registration by attribute
[assembly: Dependency(typeof(SaveImage_Droid))]
namespace LevelMeter.Droid
{
public class SaveImage_Droid : SaveImage
{
public SaveImage_Droid(SKImage snapshot,string fileName)
{
SaveImage(snapshot,fileName);
}
public void SaveImage(SKImage snapshot,string fileName)
{
var pictures = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryPictures).AbsolutePath;
Bitmap bm = snapshot.ToBitmap();
var filePath = System.IO.Path.Combine(pictures,fileName);
var stream = new FileStream(filePath,FileMode.Create);
bm.Compress(Bitmap.CompressFormat.Jpeg,90,stream);
stream.Flush();
stream.Close();
}
}
}
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