在Android中将位图保存到图库

Question

我认为这应该很简单，但我无法弄清楚。我一直收到错误：System.IO.DirectoryNotFoundException: Could not find a part of the path "/storage/emulated/0/Pictures/Screenshots/name.jpg"。

代码：

string root = Android.OS.Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryPictures).Path;
File myDir = new File(root + "/Screenshots");
myDir.Mkdirs();

string timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").Format(new Date());
string fname = CommunicationHandler.GetNickname() + "|" + timeStamp + ".jpg";

File file = new File(myDir, fname);
if (file.Exists())
    file.Delete();
try
{
    using (System.IO.Stream outStream = System.IO.File.Create(file.Path))
        {
            finalBitmap.Compress(Bitmap.CompressFormat.Jpeg, 100, outStream);
            outStream.Flush();
            outStream.Close();
        }
}
catch (Exception e)
{
    Toast.MakeText(Activity, e.ToString(), ToastLength.Long).Show();
}

另外，我无法手动访问/ storage / emulated / 0 ..

有人有想法吗？

编辑!!!：我必须手动进入应用程序设置和权限，现在没有任何崩溃，它似乎工作，但我找不到图库中的图像。

所以现在的问题是..我应该如何启动扫描，以便图像出现在图库中？

Answer 1

取自here：

MediaScannerConnection.scanFile(this, new String[]{file.toString()}, null,
    new MediaScannerConnection.OnScanCompletedListener() {
        public void onScanCompleted(String path, Uri uri) {
            Log.i("ExternalStorage", "Scanned " + path + ":");
            Log.i("ExternalStorage", "-> uri=" + uri);
        }
    });
}

另请注意，您只需通过简单的线条将图像添加到图库：

MediaStore.Images.Media.insertImage(applicationContext.getContentResolver(), IMAGE ,"nameofimage" , "description");

Answer 2

如果要创建新目录，可以使用System.IO.Directory.CreateDirectory(root);创建它。

//create a directory called MyCamera
    string root = Environment.GetExternalStoragePublicDirectory(Environment.DirectoryDcim).ToString() + "/MyCamera/";

   //create the Directory
    System.IO.Directory.CreateDirectory(root);