将文件保存在内部存储器中并通过意图读取

Question

我想从URL下载文件并将其保存到内部存储器中。一旦文件保存在内部存储器中，我想触发一个Intent在应用程序中打开它。

**Following is the code to download the file and save in internal memory:**

 private void getPDFContent(String myUrl, String sfilename) {
        try {
            FileOutputStream fos = this.openFileOutput(sfilename,Context.MODE_PRIVATE);
            URL u = new URL(myUrl);
            HttpURLConnection c = (HttpURLConnection) u.openConnection();
            c.setRequestMethod("GET");
            c.setDoOutput(true);
            c.connect();
            InputStream in = c.getInputStream();
            byte[] buffer = new byte[1024];
            int len1 = 0;
            while ((len1 = in.read(buffer)) > 0) {
                fos.write(buffer, 0, len1);
            }
            fos.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

**Following is the code to read:**

public void readInternalStorageOption() {
        try {
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_VIEW);
            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);

            String filePath = getApplication().getFilesDir().getAbsolutePath()
                    + File.separator + "test.pdf";
            File f = new File(filePath);
            if (f.exists()) {
                Uri internal = Uri.fromFile(f);
                intent.setDataAndType(internal, "application/pdf");
            }
            startActivity(intent);
        } catch (NullPointerException ex) {

        }
    }

问题是该文件已成功保存，但当我尝试通过意图打开它时，我收到一个错误，即该文件无法打开。请为此建议任何解决方案。