Android的 - 不能够附加文件的电子邮件 [英] Android - not able to attach a file in email

问题描述

在默认情况下，保存在内部存储的文件是私有的，你的应用程序和其他应用程序不能访问它们（也能够为用户的）。

我能看到文件/数据/数据​​/程序包/文件/文件探讨DDMS，但是当我附加在电子邮件中使用imageUri上述文件的URI，然后我看到附加文件是0KB的。 我已经使用了Android的默认电子邮件的API。

任何人都可以给我建议，如何将一个文件中的电子邮件是私人的应用程序？

虽然我成功了能够保存在SD卡上的文件，并安装从SD卡的文件，这是工作的罚款。

但是，如果SD卡不可用并将文件保存到内部存储器，那我怎么才能将它们附加在电子邮件中。

 字符串文件名=hello_file.txt;
串串=世界，你好！的FileOutputStream FOS = openFileOutput（文件名，Context.MODE_PRIVATE）;
fos.write（string.getBytes（））;
fos.close（）;

文件镜像文件= getFileStreamPath（文件名）;
乌里imageUri = Uri.fromFile（镜像文件）;

最终意图emailIntent =新的意图（android.content.Intent.ACTION_SEND）;
emailIntent.setType（* / *）;
emailIntent.putExtra（android.content.Intent.EXTRA_STREAM，imageUri）;

this.startActivityForResult（Intent.createChooser（emailIntent，发送邮件...），SUB_ACTIVITY）;
 

解决方案

当您尝试从内部存储附加文件，GMail的错误写入日志：

  ERROR / Gmail的（...）：文件：//附件的路径必须指向文件：/// MNT / SD卡。
 

电子邮件应用程序会告诉你，即使它没有实际存在附加的文件。

至于外部存储，文件说：

  

每一个Android兼容设备支持共享外部存储，你可以用它来保存文件。这可以是一个可移动存储介质（如SD卡）或内部（不可移动）的存储

这意味着你不必担心设备没有外部存储的。仍然，外部存储器可以是在时间不可用。请参照<一个href="http://developer.android.com/guide/topics/data/data-storage.html#filesExternal">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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