将PDF附加到Android应用的电子邮件 - 文件大小为零 [英] Attaching a PDF to an Email from Android App - File Size is Zero

问题描述

我正在尝试将一个名为download.pdf的PDF文件附加到我的Android应用程序的电子邮件中。我将文件首先复制到SDCard，然后附上电子邮件。

I am trying to attach a PDF file called download.pdf to an email in my Android App. I am copying the file first to the SDCard and then attaching it the email.

我不是相关的，但我正在一个星系选项卡设备上进行测试。外部存储路径返回mnt / sdcard /

I'm not if relevant, but I am testing on a galaxy tab device. The external storage path returns 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);
    }
}
}

问题是文件附加的是大小为0字节。任何人可能会发现可能是错误的？

The problem is that the file that is attached is 0 bytes in size. Can anyone spot what might be wrong ?

编辑

我可以看到如果我查看设置，文件已被保存到设备上，因此这个文件必须是将文件附加到电子邮件中的问题。在错误日志中，我看到：

I can see that the file has been saved onto the device if I look in settings, therefore this must be a problem around how I am attaching the file to the email. In the error log I am seeing :

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

编辑

想知道这是星系选项卡上的错误吗？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邮件，大小再次为0.任何人都可以验证？

Wondering if this is a bug on the galaxy tab ? If I open the file via a pdf viewer (from my app) then try to attach to a gmail email, the size is again 0. Can anyone verify ?

谢谢

推荐答案

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:"));

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