使用手机中自带Email的客户端在发送附件名是中文的电子邮件时，不管是在PC机上还是在Android设备上，接收到的电子邮件的附件名会显示为乱码，在网上查阅了相关技术资料，以及有关编码解码方面的书籍资料，发现跟发送时传送的文件名参数有关系，因此我们在解决该问题时，只需要修改以下文件就可以解决问题：packages/apps/Email/emailcommon/src/com/android/emailcommon/internet/Rfc822Output.java文件，将writeOneAttachment函数作如下内容的修改：
writeHeader(writer, "Content-Type",
attachment.mMimeType + ";
name="" + attachment.mFileName + """);
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;"
+ "
filename="" + attachment.mFileName + "";"
+ "
size=" + Long.toString(attachment.mSize));
}
修改为：
writeHeader(writer, "Content-Type",
attachment.mMimeType + ";
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;"
+ "
filename="" +MimeUtility.foldAndEncode2(attachment.mFileName,"Content-Disposition".length()+ 2)+ "";"
+ "
size=" + Long.toString(attachment.mSize));
}
在Rfc822Output文件writeOneAttachment函数中将文件名字编码增强下，加+2是因为还有": "这二字符也要占位置.
至此即可解决该问题。