java - 将 PDF 附加到来自 Android 应用程序的电子邮件 - 文件大小为零

Question

我正在尝试将名为 download.pdf 的 PDF 文件附加到我的 Android 应用程序中的电子邮件中。我先将文件复制到 SDCard，然后将其附加到电子邮件中。

我不是相关的，但我正在 galaxy tab 设备上进行测试。外部存储路径返回mnt/sdcard/

我的代码如下:

public void sendemail() throws IOException {

    CopyAssets();

    String emailAddress[] = {""};

    File externalStorage = Environment.getExternalStorageDirectory();

    Uri uri = Uri.fromFile(new File(externalStorage.getAbsolutePath() + "/" + "download.pdf"));

    Intent emailIntent = new Intent(Intent.ACTION_SEND);
    emailIntent.putExtra(Intent.EXTRA_EMAIL, emailAddress);
    emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Subject");
    emailIntent.putExtra(Intent.EXTRA_TEXT, "Text");
    emailIntent.setType("application/pdf");
    emailIntent.putExtra(Intent.EXTRA_STREAM, uri);

    startActivity(Intent.createChooser(emailIntent, "Send email using:"));

    }

public void CopyAssets() {
    AssetManager assetManager = getAssets();
    String[] files = null;
    try {
        files = assetManager.list("");
    } catch (IOException e) {
        Log.e("tag", e.getMessage());
    }
    for(String filename : files) {
        InputStream in = null;
        OutputStream out = null;
        if (filename.equals("download.pdf")) {
        try {
          System.out.println("Filename is " + filename);
          in = assetManager.open(filename);
          File externalStorage = Environment.getExternalStorageDirectory();
          out = new FileOutputStream(externalStorage.getAbsolutePath() + "/" + filename);
          System.out.println("Loacation is" + out);
          copyFile(in, out);
          in.close();
          in = null;
          out.flush();
          out.close();
          out = null;
        } catch(Exception e) {
            Log.e("tag", e.getMessage());
        }       
    }
    }
}
private void copyFile(InputStream in, OutputStream out) throws IOException {
    byte[] buffer = new byte[1024];
    int read;
    while((read = in.read(buffer)) != -1){
      out.write(buffer, 0, read);
    }
}
}

问题是附加的文件大小为 0 字节。任何人都可以发现可能有什么问题吗？

编辑

如果我查看设置，我可以看到该文件已保存到设备上，因此这一定是我如何将文件附加到电子邮件的问题。在我看到的错误日志中:

gMail Attachment URI: file:///mnt/sdcard/download.pdf
gMail type: application/pdf
gmail name: download.pdf
gmail size: 0

编辑

想知道这是否是 galaxy 选项卡上的错误？如果我通过 pdf 查看器(从我的应用程序)打开文件，然后尝试附加到 gmail 电子邮件，大小再次为 0。任何人都可以验证吗？

谢谢。

Answer 1

String[] mailto = {""};
                        Uri uri = Uri.fromFile(new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/CALC/REPORTS/",pdfname ));
                        Intent emailIntent = new Intent(Intent.ACTION_SEND);
                        emailIntent.putExtra(Intent.EXTRA_EMAIL, mailto);
                        emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Calc PDF Report");
                        emailIntent.putExtra(Intent.EXTRA_TEXT, ViewAllAccountFragment.selectac+" PDF Report");
                        emailIntent.setType("application/pdf");
                        emailIntent.putExtra(Intent.EXTRA_STREAM, uri);
                        startActivity(Intent.createChooser(emailIntent, "Send email using:"));