如何從 flutter 的內部存儲中打開 PDF 文件

Question

用於代碼的插件

native_pdf_view: ^4.0.1

出現錯誤的示例代碼，我可以使用資產中的 pdf 文件，但無法從本地存儲加載 pdf

    return Container(
      child: PdfView(
        controller:
            // sample,
            PdfController(
          document: PdfDocument.openFile(widget.path),
        ),
        onDocumentLoaded: (document) {
          setState(() {
            isLoaded = true;
          });
        },
        pageLoader: Center(child: CircularProgressIndicator()),
      ),
    );

錯誤，它說該文件未找到，但此文件路徑是從現有文件中提取的

D/PDF_RENDER(  585): OpenFileDocument. File: /storage/emulated/0/Doc_Holder/c4611_sample_explain.pdf
D/PDF_RENDER(  585): OpenAssetDocument. Created file: /data/user/0/com.example.doc_holder/cache/992d7c88890d40268ae7ac4103bf96ba.pdf
D/PDF_RENDER(  585): OpenFileDocument. File: /data/user/0/com.example.doc_holder/cache/992d7c88890d40268ae7ac4103bf96ba.pdf
D/PDF_RENDER(  585): OpenFileDocument. File: /storage/emulated/0/Doc_Holder/c4611_sample_explain.pdf

════════ Exception caught by widgets library ═══════════════════════════════════
The following _CastError was thrown building PdfView(dirty, state: _PdfViewState#6990d):
Null check operator used on a null value

The relevant error-causing widget was
PdfView
lib/const/pdf.dart:23
When the exception was thrown, this was the stack
#0      _PdfViewState._buildLoaded
package:native_pdf_view/src/native_pdf_view.dart:172
#1      _PdfViewState.build
package:native_pdf_view/src/native_pdf_view.dart:205
#2      StatefulElement.build
package:flutter/…/widgets/framework.dart:4683
#3      ComponentElement.performRebuild
package:flutter/…/widgets/framework.dart:4566
#4      StatefulElement.performRebuild
package:flutter/…/widgets/framework.dart:4738
...

Answer 1

請嘗試其中任何一個

pdf：^3.3.0，flutter_full_pdf_viewer：^1.0.6，syncfusion_flutter_pdfviewer：^19.1.58-beta，syncfusion_flutter_pdfviewer_platform_interface：^19.1.58-beta