Xamarin 在 Webview 中使用相机上传图片

Posted 2023-05-07

【中文标题】Xamarin 在 Webview 中使用相机上传图片

【英文标题】：Xamarin Upload pictures with camera in Webview

【发布时间】：2018-07-14 02:33:27

【问题描述】：

我已经用 WebView 相机上传了图片，但是我想上传两张图片， 第一张图片上传了，第二张图片没有上传，为什么？ 我需要做什么来解决这个问题？ 注释是否需要代码的详细信息。 下面是我的代码

MyCustomwebviewRenderer.cs

 Control.SetWebChromeClient(new WebViewChromeClient((uploadMsg, acceptType, capture) =>
        
            MainActivity.UploadMessage = uploadMsg;
            if (Build.VERSION.SdkInt < BuildVersionCodes.Kitkat)
            
                var i = new Intent(Intent.ActionCameraButton);

                //To set all type of files
                i.SetType("image/*");

                //Here File Chooser dialog is started as Activity, and it gives result while coming back from that Activity.
                ((MainActivity)this.Context).StartActivityForResult(Intent.CreateChooser(i, "File Chooser"), MainActivity.FILECHOOSER_RESULTCODE);
            
            else
            
                File imgFile = new File("/sdcard/Pictures/Repair_Image.jpg");
                mCapturedImageURI = android.Net.Uri.FromFile(new File(imgFile.ToString()));
                if (mCapturedImageURI != null)
                
                    mCapturedImageURI.Dispose();
                    imgFile.Delete();
                
                if (camera!=null)
                
                    camera.Release();
                

                File imageStorageDir = new File(global::Android.OS.Environment.GetExternalStoragePublicDirectory(global::Android.OS.Environment.DirectoryPictures),"");
                if (!imageStorageDir.Exists())
                
                    imageStorageDir.Mkdir();
                
                File file = new File(imageStorageDir + File.Separator +"Repair_Image"+ ".jpg");
                mCapturedImageURI = Uri.FromFile(file);

                Intent captureIntent = new Intent(Android.Provider.MediaStore.ActionImageCapture);
                captureIntent.PutExtra(MediaStore.ExtraOutput, mCapturedImageURI);


                ((MainActivity)this.Context).StartActivityForResult(captureIntent, MainActivity.FILECHOOSER_RESULTCODE);
            
        ));

还有我的 Mainactivity.cs

 protected override void OnActivityResult(int requestCode, Result resultCode, Intent intent)
    


        imgFile = new File("/sdcard/Pictures/Repair_Image.jpg");

        mCapturedImageURI = Android.Net.Uri.FromFile(new File(imgFile.ToString()));

        // Handles the response from the FileChooser
        if (requestCode == FILECHOOSER_RESULTCODE && resultCode == Result.Ok)
        
            if (null == UploadMessage)
                return;
            Java.Lang.Object result = intent == null || resultCode != Result.Ok ? mCapturedImageURI : intent.Data;
            UploadMessage.OnReceiveValue(result);
            UploadMessage = null;



        

       // UploadMessage.OnReceiveValue(null);
    

【参考方案1】：

我想通了。我是这样写的：

protected override void OnActivityResult(int requestCode, Result resultCode, Intent intent)
    
       var file = getLatestFilefromDir("/sdcard/Pictures/CeptePortal/");
        mCapturedImageURI = Android.Net.Uri.FromFile(file);
        if (requestCode == FILECHOOSER_RESULTCODE && resultCode == Result.Ok)
        
            if (null == UploadMessage)
                return;
            Android.Net.Uri result = null;
            if (resultCode == Result.Ok)
            
                result = intent == null ? mCapturedImageURI : intent.Data;
            
            try
            
                UploadMessage.OnReceiveValue(result);
                UploadMessage = null;
            
            catch (Exception ex)
            

                throw;
            
        
    
private Java.IO.File getLatestFilefromDir(String dirPath)
    
        File dir = new File(dirPath);
        File[] files = dir.ListFiles();
        if (files == null || files.Length == 0)
        
            return null;
        

        File lastModifiedFile = files[0];
        for (int i = 1; i < files.Length; i++)
        
            if (lastModifiedFile.LastModified() < files[i].LastModified())
            
                lastModifiedFile = files[i];
            
        
        return lastModifiedFile;
    

【讨论】：

我遇到了同样的问题，但需要查看您创建的其他课程 - 可以分享吗？

抱歉，我现在已经停止使用 Xamarin 进行开发并继续使用 Flutter。颤振是最好的！