How to Get File Path from URI in Android Oreo (8.1) or above

For now, the best approach for getting path is :

Getting physical file from URI as InputStream, ContentResolver.openInputStream() allow you to access the contents of a file without knowing its real path

String id = DocumentsContract.getDocumentId(uri);
InputStream inputStream = getContentResolver().openInputStream(uri);

then write it as a temporary file in cached storage

File file = new File(getCacheDir().getAbsolutePath()+"/"+id);
writeFile(inputStream, file);
String filePath = file.getAbsolutePath();

Here is the method to write temporary file into cached storage

void writeFile(InputStream in, File file) {
     OutputStream out = null;
     try {
          out = new FileOutputStream(file);
          byte[] buf = new byte[1024];
          int len;
          while((len=in.read(buf))>0){
            out.write(buf,0,len);
          }
     } catch (Exception e) {
          e.printStackTrace();
     }
     finally {
          try {
            if ( out != null ) {
                 out.close();
            }
            in.close();
          } catch ( IOException e ) {
               e.printStackTrace();
          }
     }
}

Not sure if its the best way to do, but the code is working properly :D

this is activity instance variable

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    Uri filePath;
    String strAttachmentFileName = "",//attached file name
            strAttachmentCoded = "";//attached file in byte code Base64
    int PICK_REQUEST =1;
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this is in activity method

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Button buttonChoose.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setType("file/*");
                intent.setAction(Intent.ACTION_GET_CONTENT);
                startActivityForResult(Intent.createChooser(intent, "Select any file"), PICK_REQUEST );
            }
        });
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this is overrride activity method

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    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == PICK_REQUEST && resultCode == Activity.RESULT_OK && data != null && data.getData() != null) {
            filePath = data.getData();
            File uploadFile = new File(FileUtils.getRealPath(activity.this, filePath));
            try {
                if (uploadFile != null) {
                    strAttachmentFileName = uploadFile.getName();
                    FileInputStream objFileIS = new FileInputStream(uploadFile);
                    ByteArrayOutputStream objByteArrayOS = new ByteArrayOutputStream();
                    byte[] byteBufferString = new byte[1024];
                    int readNum;
                    readNum = objFileIS.read(byteBufferString);
                    while (readNum != -1) {
                        objByteArrayOS.write(byteBufferString, 0, readNum);
                        readNum = objFileIS.read(byteBufferString);
                    }
                    strAttachmentCoded  = Base64.encodeToString(objByteArrayOS.toByteArray(), Base64.DEFAULT);

                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

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Please create file FileUtils.java as below

link HBiSoft

---

---

For Any Type of File in .Net ---

byte[] p = Convert.FromBase64String("byte string");

MemoryStream ms = new MemoryStream(p);
FileStream fs = new FileStream
        (System.Web.Hosting.HostingEnvironment.MapPath("~/ComplaintDetailsFile/") +
                item.FileName, FileMode.Create);
ms.WriteTo(fs);
ms.Close();
fs.Close();
fs.Dispose();