下面是一个用intent发用邮件的Util类，可以发送附件。

//MailUtil.java
package com.maclab.util;

import java.io.File;

import com.dropbox.client2.session.Session.AccessType;

public class MailUtil {

public static void sendMail(String path,Context c)
{
File file = new File(path); //附件文件地址

Intent intent = new Intent(Intent.ACTION_SEND);
intent.putExtra("subject", file.getName()); //
intent.putExtra("body", "Email from CodePad"); //正文
intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file)); //添加附件，附件为file对象
if (file.getName().endsWith(".gz")) {
intent.setType("application/x-gzip"); //如果是gz使用gzip的mime
} else if (file.getName().endsWith(".txt")) {
intent.setType("text/plain"); //纯文本则用text/plain的mime
} else {
intent.setType("application/octet-stream"); //其他的均使用流当做二进制数据来发送
}
c.startActivity(intent); //调用系统的mail客户端进行发送}
}

public static void mailContact(Context c,String mailAdress)
{
Intent it = new Intent(Intent.ACTION_SEND);
String[] receiver;
receiver=new String[]{mailAdress};
it.putExtra(Intent.EXTRA_EMAIL, receiver);
it.putExtra("subject", "About CodePad");
it.putExtra(Intent.EXTRA_TEXT, "/*Thanks advance for any tips.*/");

it.setType("text/plain");
c.startActivity(Intent.createChooser(it, "Choose Email Client")); //调用系统的mail客户端进行发送
}

}