目前我面临无法检索 pdf 的实际文件路径的问题。我尝试了我得到的所有解决方案，但无法获得 Android Pie 中的实际文件路径。任何帮助都将不胜感激。

代码:- Intent 打开文件管理器并允许选择 pdf 文件。

Intent intent = new Intent();
intent.setType("application/pdf");
intent.setAction(Intent.ACTION_GET_CONTENT);
String[] mimetypes = {"application/pdf"};
intent.putExtra(Intent.EXTRA_MIME_TYPES, mimetypes);
startActivityForResult(Intent.createChooser(intent, "Choose Pdf"), REQUEST_CODE_SELECT_IMAGE);

在点击/选择任何 pdf 文件后，编译器移动到 onActivityResult:-

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode) {
        case REQUEST_CODE_SELECT_IMAGE:
            String template_file_uri = null;
            String extension = null;
            switch (resultCode) {
                case Activity.RESULT_OK:
                    try {

                        String path = null;
                        if (android.os.Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP) {
                            Uri selectedFileUri = data.getData();
                            String mimeType = getContentResolver().getType(selectedFileUri);
                            Log.e(TAG, "onActivityResult() REQUEST_CODE_SELECT_IMAGE RESULT_OK uri : " + selectedFileUri + " mimetype " + mimeType);
                            Log.e(TAG, ":::>>selectedFileUri::: " + selectedFileUri);

                            int lastDot = selectedFileUri.toString().lastIndexOf('.');
                            if (lastDot == -1) {
                                // No dots - what do you want to do?
                                ApplicationHelper.showToast(activity, "Please select only pdf file !!!");
                            } else {
                                extension = selectedFileUri.toString().substring(lastDot);
                                Log.e(TAG, "extension: " + extension);
                            }

                            if (extension.equals(".pdf") || mimeType.equals("application/pdf")) {
                                template_file_uri = selectedFileUri.toString();
                                displayFromUri(selectedFileUri);
                                getRealPathFromURI = ApplicationHelper.getRealPathFromURI(activity, selectedFileUri);

                            } else {
                                Log.e(TAG, "else ext: " + extension);
                                ApplicationHelper.showToast(activity, "Please select only pdf file !!!");
                                template_file_uri = null;
                            }
                            Log.e(TAG, "::::>>>getRealPathFromURI::: " + getRealPathFromURI);

                        } else {
                            Uri selectedFileUri = data.getData();
                            String path1 = getPath(activity, selectedFileUri);
                        }

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

                    break;

                case Activity.RESULT_CANCELED:
                    template_file_uri = null;
                    break;

                default:
                    break;
            }
            break;

        default:
            break;

    }
}

getRealPathFromURI 方法:-

@TargetApi(Build.VERSION_CODES.KITKAT)
public static String getRealPathFromURI(Context context, Uri uri) {
    Log.i(TAG, "getRealPathFromURI() uri " + uri);
    String pattern = "/^[ A-Za-z0-9_@./#&+-]*$/";
    uri = Uri.parse(uri.toString().replaceAll(pattern, uri.toString()));

    String path = FileUtils.getPath(context, uri);
    Log.i(TAG, "getRealPathFromURI() get path " + path);
    if (ApplicationHelper.isStringValid(path)) {
        if (!path.contains("://")) {
            path = "file://" + path;
        }
        path = path.replaceAll(pattern, path);
        //path = path.replace(" ", "%20");
    } else {
        path = uri.toString();
    }
    Log.i(TAG, "getRealPathFromURI() return path " + path);
    return path;
}

FileUtils:-

 @TargetApi(Build.VERSION_CODES.KITKAT)
public static String getPath(final Context context, final Uri uri) {
    Log.i(TAG, "getPath() uri " + uri);
    if (DEBUG)
        Log.d(TAG + " File -",
                "Authority: " + uri.getAuthority() +
                        ", Fragment: " + uri.getFragment() +
                        ", Port: " + uri.getPort() +
                        ", Query: " + uri.getQuery() +
                        ", Scheme: " + uri.getScheme() +
                        ", Host: " + uri.getHost() +
                        ", Segments: " + uri.getPathSegments().toString()
        );

    final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;


    if (isInternalStorageDocument(uri)) {
        return uri.toString();
    }

    // DocumentProvider
    else if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {

        if (isExternalStorageDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];

            if ("primary".equalsIgnoreCase(type)) {
                return Environment.getExternalStorageDirectory() + "/" + split[1];
            }

            // TODO handle non-primary volumes
        }
        // DownloadsProvider
        else if (isDownloadsDocument(uri)) {

            try {
                final String id = DocumentsContract.getDocumentId(uri);
//                    final long id = Long.parseLong(DocumentsContract.getDocumentId(uri));
                final Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
                Log.e(TAG, "Uri....");
            return getDataColumn(context, contentUri, null, null);
            } catch (NumberFormatException e) {
                e.printStackTrace();
            }
        }
        // MediaProvider
        else if (isMediaDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];

            Uri contentUri = null;
            if ("image".equals(type)) {
                contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
            } else if ("video".equals(type)) {
                contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
            } else if ("audio".equals(type)) {
                contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
            }

            final String selection = "_id=?";
            final String[] selectionArgs = new String[]{
                    split[1]
            };

            return getDataColumn(context, contentUri, selection, selectionArgs);
        }
    }
    // MediaStore (and general)
    else if ("content".equalsIgnoreCase(uri.getScheme())) {

        // Return the remote address
        if (isGooglePhotosUri(uri))
            return uri.getLastPathSegment();

        return getDataColumn(context, uri, null, null);
    }
    // File
    else if ("file".equalsIgnoreCase(uri.getScheme())) {
        return uri.getPath();
    } else if (!ApplicationHelper.haveAuthority(uri)) {
        return Constants.AUTHORITY_FILE + uri.toString();
    }

    return null;
}