在设备上保存 pdf 文件

Question

我正在填写 pdf 表单并将其保存到设备中，但第一个捕获返回：“FileNotFoundException：/storage/emulated/0/myFile.pdf：打开失败：EPERM（不允许操作）”。即使我在代码中添加了一个 checkPermission 函数。

这是我的代码：

checkPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE, 101);
checkPermission(Manifest.permission.READ_EXTERNAL_STORAGE, 101);

                File file = new File(Environment.getExternalStorageDirectory().getPath()+ "/myFile.pdf");

                try {
                    PdfReader reader = new PdfReader(getResources().openRawResource(R.raw.bail_1));

                    try {
                        PdfWriter writer = new PdfWriter(new FileOutputStream(file));
                        PdfDocument pdf = new PdfDocument(reader, writer);

                        pdf.close();
                        writer.close();

                        Toast.makeText(this, "OK", Toast.LENGTH_SHORT).show();

                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                        Toast.makeText(this,"FileNotFoundException: " + e.getMessage(), Toast.LENGTH_SHORT).show;
                        return;

                    }

                    reader.close();

                } catch (IOException e) {
                    e.printStackTrace();
                    Toast.makeText(this,"FileNotFoundException: " + e.getMessage(), Toast.LENGTH_SHORT).show; 
                    return;
                }

                
    private void checkPermission(String permission, int requestCode) {
        if (ContextCompat.checkSelfPermission(this, permission) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{permission}, requestCode);
        }
    }

Answer 1

   this is not just regarding the reader issue
   it may be about the path.....change your code to this and check
// change your path receiving line to   
    File file = new File(getFilePath("myFile.pdf"));

//and Path getting Function
private String getFilePath(String pdfName) {
           ContextWrapper contextWrapper = new 
                          ContextWrapper(getApplicationContext());
       File fileDir = Environment.getExternalStorageDirectory();
       File pdfFile = new File (fileDir, pdfName);
       return pdfFile.getPath();
}
//Old Conventional ways do not work in some cases