Delphi - Android - Saving textfile to internal storage

Question

I'm pretty new to Android development. I want to develop an App, that is able to save a text file on the internal storage (in the App's private folder or something like that).

I have following code:

    procedure TfrmMain.Button1Click(Sender: TObject);
    var
      tstrTmp: TStringList;
      sFn: String;
    begin
      tstrTmp := TStringList.Create;
      tstrTmp.Text := 'Test';
      sFn := Format( '%s/Test.txt', [GetHomePath ]);
      sFn := System.IOUtils.TPath.GetDocumentsPath + System.SysUtils.PathDelim + 'Test.txt';
      sFn := TPath.Combine( System.IOUtils.TPath.GetDocumentsPath , 'Test.txt' );
      tstrTmp.SaveToFile( sFn );
      tstrTmp.Free;
      showmessage( sFn );
    end;

When I run the App and click the button, it is showing me: '/data/user/0/com.embarcadero.[MyAppName]/files/Test.txt'. So, I would assume that the file was physically written to that location.

But when I connect my device to my pc, I can't even find this folder. I also searched on the external storage but I was not able to find this folder or file (Test.txt).

I did found a folder on my internal storage : /Android/data/com.embarcadero.[MyAppName]/files, but no file in there.

so, I'm a bit stuck here, because I would assume the file is saved somewhere. But I'm not able to find it.

Am I doing something wrong here? Thanks for your feedback.

Best Regards,

Wim.

Just a quick guess: Your app should probably create the directory if it doesn't already exists. — fpiette
– fpiette, Commented Oct 15, 2020 at 9:22
Does you app has the WRITE_EXTERNAL_STORAGE and READ_EXTERNAL_STORAGE permissions? — fpiette
– fpiette, Commented Oct 15, 2020 at 9:23
You do not need any permission and the directory is already there. On your PC only Android Studio/Delphi can show you that location and i am not shure about Delphi. Also file manager apps on your device will not show you this directory as they have no access to your apps private folder. — blackapps
– blackapps, Commented Oct 15, 2020 at 9:34
You can -with code- check if a file exist. And you can read that file for further use. Do it and you will see. — blackapps
– blackapps, Commented Oct 15, 2020 at 9:35
GetHomePath/TPath.GetDocumentsPath is private to your app, it is not exposed to other apps or the PC. If you want to make a file accessible to them, it needs to be created in a public folder instead, like TPath.GetSharedDocumentsPath. Also, just FYI, last time I checked (albeit that was a long while ago), FireMonkey did a pretty lousy job of reporting errors for various operations, like creating files, so more times than not you wouldn't know if such operations actually succeeded or failed. — Remy Lebeau
– Remy Lebeau, Commented Oct 15, 2020 at 17:59

user3261006 · Accepted Answer · 2020-10-22 16:27:18Z

2

So, the solution was: Set the App-Permisisons for Storage (Settings - Apps - MyApp - Permission - Storage).

Once this was done, using the TPath.GetPublicPath to store the file resulted in a file on the Device (Internal Storage) on: /storage/emulated/0/Android/data//files Where '/storage/emulated/0' = the rootfolder of the internal storage of my device.

answered Oct 22, 2020 at 16:27

user3261006

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mesutuk · Accepted Answer · 2021-03-04 07:31:25Z

0

If you have concern if the internal root path changes between devices you can try this

AppPath := ReplaceStr(System.IOUtils.TPath.GetSharedDownloadsPath,'/Download','');

will give you what you want so you don't have to worry if it is '/storage/emulated/0' or something else.

answered Mar 4, 2021 at 7:31

mesutuk

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