Android - 获取从文件资源管理器中选择的 .txt 文件的真实路径

Question

I am working on an app where I want to be able to export and import some data from the app, on a .txt file. The minimum API of the app is 21.

The export part works well, but I am having trouble with the import part.

I open the file explorer :

butImportPatient.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View view) {
         Intent intent = new Intent();
         intent.setAction(Intent.ACTION_OPEN_DOCUMENT);
         intent.setType("*/*");
         startActivityForResult(intent, IMPORTPATIENT_ACTIVITY_REQUEST_CODE);
    }
});

This looks like it is working.

But my onActivityResult doesn't work, I didn't find how I can get the file from the Uri.

For now, here is my code :

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

      if (requestCode == IMPORTPATIENT_ACTIVITY_REQUEST_CODE && resultCode == RESULT_OK) {
            File file = new File(data.getData().getPath()) ;
            String path = file.getAbsolutePath() ;
            StringBuilder text = new StringBuilder();

            try {
                BufferedReader br = new BufferedReader(new FileReader(path));
                String line;

                while ((line = br.readLine()) != null) {
                    text.append(line);
                    text.append("\n");

                }
                br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

            AlertDialog.Builder builder = new AlertDialog.Builder(this) ;
            builder.setMessage(path)
                    .show() ;

        }
 }

It is a mix of multiple posts I saw here, but none seems to work.

I get this path :

/document/home:List.txt

It creates FileNotFoundException. How can I get the real path of the file ?

Answer 1

I didn't find how I can get the file from the Uri.

There is no file. ACTION_OPEN_DOCUMENT and ACTION_GET_CONTENT do not open a file. They open a document. That document might be a file. It might not. That Uri might point to:

• A local file on external storage
• A local file on internal storage for the other app
• A local file on removable storage
• A local file that is encrypted and needs to be decrypted on the fly
• A stream of bytes held in a BLOB column in a database
• A piece of content that needs to be downloaded by the other app first
• ...and so on

How can I get the real path of the file ?

You don't.

If you wish to only accept files, integrate a file chooser library instead of using ACTION_OPEN_DOCUMENT or ACTION_GET_CONTENT . Just bear in mind that filesystem access to external storage is limited on Android 10+.

If you use ACTION_GET_CONTENT , and the scheme of the Uri that you get is file , then getPath() will be a filesystem path.

Otherwise, you need to understand that you have no idea where the document is coming from , and stop thinking in terms of "real path of the file". Use ContentResolver and openInputStream() to make a copy of the content to some file that you control, then work with that file.

Answer 2

Android has problem to read real path of file from device i recommended to you to use this library to select file

implementation 'com.droidninja:filepicker:2.2.1' FielPicker