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(用户也不能).

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

我能够在 DDMS 的文件浏览中看到文件/data/data/package_name/files/"，但是当我在电子邮件中使用 imageUri 附加上述文件 URI 时，我看到该附加文件的大小为 0kb.我使用了 Android 的默认电子邮件 API.

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.

谁能建议我，如何在电子邮件中附加应用程序私有的文件?

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

虽然我成功地将文件保存在 SD 卡中并从 SD 卡附加文件，但这工作正常.

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

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

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);

推荐答案

当您尝试从内部存储附加文件时，GMail 将错误写入日志:

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. 

电子邮件应用程序会向您显示附件，即使它实际上并不存在.

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

至于外部存储，文档说:

As for an external storage, documentation says that:

每个与 Android 兼容的设备都支持共享的外部存储"，您可以使用它来保存文件.这可以是可移动存储介质(例如 SD 卡)或内部(不可移动)存储.

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.

这意味着您完全不必担心设备没有外部存储.尽管如此，外部存储有时仍不可用.请参阅 http://developer.android.com/guide/topics/data/data-storage.html#filesExternal

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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