Android6.0 Email发送邮件附件中文名乱码

路径：

packages\apps\Email\emailcommon\src\com\android\emailcommon\internet\Rfc822Output.java

修改此方法：

private static void writeOneAttachment(Context context, Writer writer, OutputStream out,
            Attachment attachment) throws IOException, MessagingException {

         writeHeader(writer, "Content-Type",
-                attachment.mMimeType + ";\n name=\"" + attachment.mFileName + "\"");
+                attachment.mMimeType + ";\n name=\"" + 
+                MimeUtility.foldAndEncode2(attachment.mFileName,"Content-Type".length() + 2)  
+                + "\"");
         writeHeader(writer, "Content-Transfer-Encoding", "base64");
         // Most attachments (real files) will send Content-Disposition.  The suppression option
         // is used when sending calendar invites.
         if ((attachment.mFlags & Attachment.FLAG_ICS_ALTERNATIVE_PART) == 0) {
             writeHeader(writer, "Content-Disposition",
                     "attachment;"
-                    + "\n filename=\"" + attachment.mFileName + "\";"
+                    + "\n filename=\"" +  
+                    MimeUtility.foldAndEncode2(attachment.mFileName,"Content-Disposition".length()  
+                            + 2)  
+                    + "\";"
                     + "\n size=" + Long.toString(attachment.mSize));
         }
         if (attachment.mContentId != null) {