I Use Storage Access Framework to browse a file link f.cfg, when you select the file, the app need to load another file like f.dat automatically, how?

Question

In Android Studio:

This app must use COMTRADE files. The COMTRADE files are *.cfg *.dat and *.rio files. For example, (user.cfg, user.dat and user.rio). The main file is *.cfg file, so the user must browse by SAF to find *.cfg files, when the user select this file, the app must load other files ( *.dat and *.rio) automatically.

I can not use <uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/> for android level 30

So I have to use Storage Access Framework, By below code the user browse *.cfg files and select a file like user.cfg

if(SDK_INT >= Build.VERSION_CODES.R)
{

   Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
   intent.addCategory(Intent.CATEGORY_OPENABLE);
   intent.setType("*/*");

   Act.startActivityForResult(intent, 111);

}
else
{...}

Then SAF return URI of that user.cfg file, and the app does not have any URI of other files to load.

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{

   super.onActivityResult(requestCode, resultCode, data);

   if(requestCode == 111)
   {
    
      if (resultCode == Activity.RESULT_OK) 
      {
    
         if (data != null)
         {
    
            try 
            {
    
               Uri uri = null;
               uri = data.getData();
    
               InputStreamReader inputStreamReader = new InputStreamReader(getContentResolver().openInputStream(uri));
                            
               BufferedReader br = new BufferedReader(inputStreamReader);

               // I want URI of user.dat how?
                            
               InputStreamReader inputStreamReader1 = new InputStreamReader(getContentResolver().openInputStream(uri1));
                            
               BufferedReader br1 = new BufferedReader(inputStreamReader1);
    
               ....
                        
               }  
               catch (Exception e)
               {
                  e.printStackTrace();
               }

            }           

         }
    
      }

   }

}

Please help me how can I do this? Thanks.

score 1 · Accepted Answer · answered Jan 14 '22 at 23:12

Please help me how can I do this?

You cannot do this, at least by means of using ACTION_OPEN_DOCUMENT, unless you ask the user to open each of your three documents in turn. Just because the user selected a .cfg file does not mean that you have any rights to any other files, including those adjacent to it.

You could try using ACTION_OPEN_DOCUMENT_TREE and let the user choose the document tree that contains your desired files. From there, you can:

Use DocumentFile.fromTreeUri() to get a DocumentFile representing the tree
Call listFiles() on that DocumentFile to get the direct contents of that tree, in the form of a list of DocumentFile objects
Call getName() on each of those to get their display names, then see which names have your desired file extensions and matching base names (foo.cfg and foo.rio and foo.dat)
For those that you want to use, call getUri() on the DocumentFile to get a Uri to use with ContentResolver and openInputStream() to read in the content

Thanks a lot. So I think, First I have to list all cfg files in a folder like Downloads folder, then the user select a cfg file, and then the app find other files. Thanks for your help. — Farhad Aghajanian, Jan 15 '22 at 03:46
Excuse me, how can I get list of files in a folder like Download folder By SAF or anything else? I do not want the user to select download folder, I want to do this first by the app. — Farhad Aghajanian, Jan 15 '22 at 03:48
The user should select the folder if your app uses ACTION_OPEN_DOCEMENT_TREE. Since Android R/11 the Download directory can not be choosen. — blackapps, Jan 15 '22 at 05:35

I Use Storage Access Framework to browse a file link f.cfg, when you select the file, the app need to load another file like f.dat automatically, how?

1 Answers1