PDF File Read Access on Android Download Directory

Question

On /storage/emulated/0/Download directory, I'm not able to get read access of PDF file. How can I enable read access on it?

I'm using Android 13 Device, and android development in Kotlin.

Granted Read URI permission, but didn't get any luck.

Answer 1

In this way you can get the URI of PDF

ActivityResultLauncher<String[]> filePickerLauncher= registerForActivityResult(new ActivityResultContracts.OpenDocument(),
                    result -> {
                        if (result != null) {
                           //DO SOMETHING WITH THE RESULT
                        }
                    });
Intent filePickerIntent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
filePickerIntent.addCategory(Intent.CATEGORY_OPENABLE);
filePickerLauncher.launch(new String[] {"application/pdf"});

Update 1 If you want to upload file through retrofit you can use MultipartBody.Part which is available in Retrofit

You can do it as follows:

private MultipartBody.Part createMultipartBody(File file) {
        RequestBody requestBody = RequestBody.create(MediaType.parse("multipart/form-data"), file);
        return MultipartBody.Part.createFormData(<Your key>, file.getName(), requestBody);

    }

API interface

   @Multipart
    @POST(<Your endpoint here>)
    Call<ResponseBody> yourMethod(@Part MultipartBody.Part file);

API calling:

Call<ResponseBody> apiCall = Client.getConverterClient().yourMethod(createMultipartBody(fileData));
        apiCall.enqueue(new Callback<ResponseBody>() {
            @Override
            public void onResponse(@NonNull Call<ResponseBody> call, @NonNull Response<ResponseBody> response) {
                try {
                    if (response.code() == 200){
                          //HANDLE YOUR REST OF THE CODE HERE
                    }
                } catch (IOException ex) {
                    ex.printStackTrace();
                }
            }

            @Override
            public void onFailure(@NonNull Call<ResponseBody> call, @NonNull Throwable t) {
                //HANDLE ERROR HERE
            }
        });

Update 2 To get file path by using URI you can use following snippet:

 public static String getFilePath(Uri uri, Context context) {
        Cursor returnCursor = context.getContentResolver().query(uri, null, null, null, null);

        if (returnCursor == null) {
            return null;
        }

        int nameIndex = returnCursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
        returnCursor.moveToFirst();
        String name = returnCursor.getString(nameIndex);
        File file = new File(context.getFilesDir(), name);

        try {
            InputStream inputStream = context.getContentResolver().openInputStream(uri);
            FileOutputStream outputStream = new FileOutputStream(file);
            int read;
            int maxBufferSize = 1024 * 1024;
            int bytesAvailable = inputStream.available();

            int bufferSize = Math.min(bytesAvailable, maxBufferSize);
            byte[] buffers = new byte[bufferSize];
            while ((read = inputStream.read(buffers)) != -1) {
                outputStream.write(buffers, 0, read);
            }
            inputStream.close();
            outputStream.close();
            returnCursor.close();
        } catch (Exception e) {
            e.getLocalizedMessage();
        }
        return file.getPath();
    }