Android - 无法在电子邮件中附加文件 [英] Android - not able to attach a file in email

问题描述

默认情况下，保存到内部存储的文件对您的应用程序是私有的，其他应用程序无法访问它们（用户也不可以使用）。

我可以看到在DDMS中的文件/ data / data / package_name / files / in file explore中，但是当我在电子邮件中使用imageUri附加了上述文件URI时，我看到附件文件是0kb
i使用了默认的电子邮件Android的API。

任何人都可以建议我，如何在电子邮件中附加一个文件，这是私人的应用程序？

尽管我能够将文件保存在SD卡中并从SD卡中附加文件，但这是正常的。

但是如果SD卡不可用并将文件保存到内部存储器中，然后如何将它们附加到电子邮件中。

  String FILENAME =hello_file.txt ; 
 String string =hello world！; FileOutputStream fos = openFileOutput（FILENAME，Context.MODE_PRIVATE）; 
 fos.write（string.getBytes（））; 
 fos.cl OSE（）; 
 
文件imageFile = getFileStreamPath（FILENAME）; 
 Uri imageUri = Uri.fromFile（imageFile）; 
 
 final Intent emailIntent = new Intent（android.content.Intent.ACTION_SEND）; 
 emailIntent.setType（* / *）; 
 emailIntent.putExtra（android.content.Intent.EXTRA_STREAM，imageUri）; 
 
 this.startActivityForResult（Intent.createChooser（emailIntent，Send mail ...），SUB_ACTIVITY）; 
  

解决方案

当您尝试从内部存储中附加文件时，在日志中写入错误：

  ERROR / Gmail（...）：file：//附件路径必须指向文件：/// MNT / SD卡。 
  

电子邮件应用程序会显示附件文件，即使它没有实际存在。 p>

对于外部存储，文档说：

每个Android兼容设备支持可以用来保存文件的共享外部存储。这可以是可移动存储介质（如SD卡）或内部（不可移动）存储。

这意味着不必担心设备根本没有外部存储。不过，外部存储可能无法使用。请参阅 http://developer.android.com/guide/topics /data/data-storage.html#filesExternal

By default, files saved to the internal storage are private to your application and other applications cannot access them (nor can the user).

I am able to see the file "/data/data/package_name/files/ in file explore in DDMS, but when i attached the above file URI using imageUri in email , then i saw that attached file is of 0kb. i have used the default email APIs of Android.

Can anyone suggest me ,how to attach a file in email that is private to the application?

although i am successful able to save the file in SD card and attaching the file from SD card , this is working fine.

But if SD card is not available and saving the file to the internal storage , then how can i attach them in email.

String FILENAME = "hello_file.txt";
String string = "hello world!";FileOutputStream fos = openFileOutput(FILENAME,     Context.MODE_PRIVATE);
fos.write(string.getBytes());
fos.close();

File imageFile = getFileStreamPath(FILENAME );
Uri imageUri = Uri.fromFile(imageFile);

final Intent emailIntent = new Intent(android.content.Intent.ACTION_SEND);
emailIntent.setType("*/*");
emailIntent.putExtra(android.content.Intent.EXTRA_STREAM,imageUri);

this.startActivityForResult(Intent.createChooser(emailIntent, "Send mail..."),SUB_ACTIVITY);

解决方案

When you try to attach file from internal storage, GMail writes an error to the log:

ERROR/Gmail(...): file:// attachment paths must point to file:///mnt/sdcard. 

E-mail application would show you the attached file even if it didn't physically exist.

As for an external storage, documentation says that:

Every Android-compatible device supports a shared "external storage" that you can use to save files. This can be a removable storage media (such as an SD card) or an internal (non-removable) storage.

That means you don't have to worry about device not having an external storage at all. Still, external storage can be unavailable at times. Refer to http://developer.android.com/guide/topics/data/data-storage.html#filesExternal

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