利用Android实现电子邮箱客户端

本文主要讲述了安卓平台上利用QQ邮箱SMTP协议，POP3协议发送与接收消息的实现

发送邮件核心代码

 import java.security.Security;    
  import java.util.Date;    
  import java.util.Properties;    

   import javax.mail.Authenticator;    
    import javax.mail.Message;    
    import javax.mail.MessagingException;    
   import javax.mail.PasswordAuthentication;    
   import javax.mail.Session;    
   import javax.mail.Transport;    
    import javax.mail.internet.AddressException;    
    import javax.mail.internet.InternetAddress;    
   import javax.mail.internet.MimeMessage;    

    /**    
     * 使用Gmail发送邮件    
     * @author Winter Lau    
     */    
    public class GmailSender {    

     public static void main(String[] args) throws AddressException, MessagingException {    
      Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());    
      final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";    
      // Get a Properties object    
      Properties props = System.getProperties();    
      props.setProperty("mail.smtp.host", "smtp.qq.com");    
      props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY);    
      props.setProperty("mail.smtp.socketFactory.fallback", "false");    
     props.setProperty("mail.smtp.port", "465");    
      props.setProperty("mail.smtp.socketFactory.port", "465");    
      props.put("mail.smtp.auth", "true");    
      final String username = "yourusername";    
      final String password = "yourpassword";    
     Session session = Session.getDefaultInstance(props, new Authenticator(){    
          protected PasswordAuthentication getPasswordAuthentication() {    
              return new PasswordAuthentication(username, password);    
          }});    

           // -- Create a new message --    
     Message msg = new MimeMessage(session);    

     // -- Set the FROM and TO fields --    
     msg.setFrom(new InternetAddress(username + "@qq.com"));    
      msg.setRecipients(Message.RecipientType.TO,    
       InternetAddress.parse("[e-mail]",false));    
      msg.setSubject("Hello");    
      msg.setText("How are you");    
     msg.setSentDate(new Date());    
      Transport.send(msg);    

      System.out.println("Message sent.");    
     }    
    }

接收邮件核心代码

 import java.io.UnsupportedEncodingException;    
    import java.security.*;    
    import java.util.Properties;    
    import javax.mail.*;    
    import javax.mail.internet.InternetAddress;    
    import javax.mail.internet.MimeUtility;    

   /**    
    * 用于收取Gmail邮件    
     * @author Winter Lau    
    */    
   public class GmailFetch {    

    public static void main(String argv[]) throws Exception {    

      Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());    
     final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";    

      // Get a Properties object    
      Properties props = System.getProperties();    
      props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);    
     props.setProperty("mail.pop3.socketFactory.fallback", "false");    
      props.setProperty("mail.pop3.port", "995");    
      props.setProperty("mail.pop3.socketFactory.port", "995");    

      //以下步骤跟一般的JavaMail操作相同    
      Session session = Session.getDefaultInstance(props,null);    

     //请将红色部分对应替换成你的邮箱帐号和密码    
     URLName urln = new URLName("pop3","pop.qq.com",995,null,    
       "[e-mail]", "yourpassword");    
    Store store = session.getStore(urln);    
      Folder inbox = null;    
      try {    
       store.connect();    
       inbox = store.getFolder("INBOX");    
       inbox.open(Folder.READ_ONLY);    
       FetchProfile profile = new FetchProfile();    
       profile.add(FetchProfile.Item.ENVELOPE);    
       Message[] messages = inbox.getMessages();    
      inbox.fetch(messages, profile);    
       System.out.println("收件箱的邮件数：" + messages.length);    
       for (int i = 0; i < messages.length; i++) {    
       //邮件发送者    
       String from = decodeText(messages[i].getFrom()[0].toString());    
        InternetAddress ia = new InternetAddress(from);    
       System.out.println("FROM:" + ia.getPersonal()+'('+ia.getAddress()+')');    
        //邮件标题    
        System.out.println("TITLE:" + messages[i].getSubject());    
        //邮件大小    
        System.out.println("SIZE:" + messages[i].getSize());    
        //邮件发送时间    
        System.out.println("DATE:" + messages[i].getSentDate());    
       }    
      } finally {    
       try {    
        inbox.close(false);    
      } catch (Exception e) {}    
      try {    
        store.close();    
       } catch (Exception e) {}    
      }    
     }    

    protected static String decodeText(String text)    
       throws UnsupportedEncodingException {    
      if (text == null)    
       return null;    
     if (text.startsWith("=?GB") || text.startsWith("=?gb"))    
      text = MimeUtility.decodeText(text);    
     else    
      text = new String(text.getBytes("ISO8859_1"));    
     return text;    
    }    

   }    

注意，接收邮件使用java客户端时可以正常得到数据，在使用安卓的时候，就会卡在store.connect(),原因不详，无法解决

问题已解决，安卓似乎强行并不允许连接网络的操作在主线程中，将store.connnect()放到子线程中即可，不然会卡住

注意，发邮件时，要导入activation.jar,不然的话会报java.lang.noClassDefFoundError:javax.activation.DataHandler

最后完成版本

主界面

package com.zj.myemail;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.net.Uri;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.BaseExpandableListAdapter;
import android.widget.EditText;
import android.widget.ExpandableListView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;

public class MainActivity extends Activity {

    private ExpandableListView expendView;
    private int []group_click=new int[5];
    private long mExitTime=0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.activity_main);
         final MyExpendAdapter adapter=new MyExpendAdapter();

        expendView=(ExpandableListView) findViewById(R.id.list);
        expendView.setGroupIndicator(null);  //设置默认图标不显示
        expendView.setAdapter(adapter);

        //一级点击事件
        expendView.setOnGroupClickListener(new OnGroupClickListener() {
            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                    int groupPosition, long id) {

                group_click[groupPosition]+=1;
                adapter.notifyDataSetChanged();
                return false;
            }
        });

        //二级点击事件
        expendView.setOnChildClickListener(new OnChildClickListener() { 
            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                //可在这里做点击事件
                if(groupPosition==0&&childPosition==1){
                    /*AlertDialog.Builder builder=new Builder(MainActivity.this);
                    builder.setTitle("添加联系人");

                    View view=getLayoutInflater().inflate(R.layout.email_add_address, null);
                    final EditText name=(EditText) view.findViewById(R.id.name);
                    final EditText addr=(EditText) view.findViewById(R.id.address);

                    builder.setView(view);
                    builder.setPositiveButton("确定", new OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            insertAddress(name.getText().toString().trim(),addr.getText().toString().trim());
                        }
                    });
                    builder.setNegativeButton("取消", null);
                    builder.show();*/
                }else if(groupPosition==0&&childPosition==0){
                    //Intent intent=new Intent(MainActivity.this, MailConstactsActivity.class);
                    //startActivity(intent);
                }else if(groupPosition==1&&childPosition==0){
                    Intent intent=new Intent(MainActivity.this, MailEditActivity.class);
                    startActivity(intent);
                }else if(groupPosition==1&&childPosition==1){
                    //Intent intent=new Intent(MainActivity.this, MailCaogaoxiangActivity.class);
                    //startActivity(intent);
                }else if(groupPosition==2&&childPosition==0){
                    Intent intent=new Intent(MainActivity.this, MailBoxActivity.class);
                    intent.putExtra("TYPE", "INBOX");
                    intent.putExtra("status", 0);//全部
                    startActivity(intent);
                }else if(groupPosition==2&&childPosition==1){
                    //Intent intent=new Intent(MainActivity.this, MailBoxActivity.class);
                    //intent.putExtra("TYPE", "INBOX");
                    //intent.putExtra("status", 1);//未读
                    //startActivity(intent);
                }else if(groupPosition==2&&childPosition==2){
                    //Intent intent=new Intent(MainActivity.this, MailBoxActivity.class);
                    //intent.putExtra("TYPE", "INBOX");
                    //intent.putExtra("status", 2);//已读
                    //startActivity(intent);
                }
                adapter.notifyDataSetChanged();
                return false;
            }
        });

    }

    /**
     * 添加联系人
     */
    /*private void insertAddress(String user,String address){
        if(user==null){
            Toast.makeText(HomeActivity.this, "用户名不能为空", Toast.LENGTH_SHORT).show();
        }else{
            if(!EmailFormatUtil.emailFormat(address)){
                Toast.makeText(HomeActivity.this, "邮箱格式不正确", Toast.LENGTH_SHORT).show();
            }else{
                Uri uri=Uri.parse("content://com.emailconstantprovider");
                ContentValues values=new ContentValues();
                values.put("mailfrom", MyApplication.info.getUserName());
                values.put("name", user);
                values.put("address", address);
                getContentResolver().insert(uri, values);

                Toast.makeText(HomeActivity.this, "添加数据成功", Toast.LENGTH_SHORT).show();
            }
        }


    }*/

    /**
     * 适配器
     * @author Administrator
     *
     */
    private class MyExpendAdapter extends BaseExpandableListAdapter{

        /**
         * pic state
         */
        //int []group_state=new int[]{R.drawable.group_right,R.drawable.group_down};

        /**
         * group title
         */
        String []group_title=new String[]{"联系人","写邮件","收件箱"};

        /**
         * child text
         */
        String [][] child_text=new String [][]{
                {"联系人列表","添加联系人"},
                {"新邮件","草稿箱"},
                {"全部邮件","未读邮件","已读邮件"},};
        int [][] child_icons=new int[][]{
                {R.drawable.listlianxiren,R.drawable.tianjia},
                {R.drawable.xieyoujian,R.drawable.caogaoxiang},
                {R.drawable.all,R.drawable.notread,R.drawable.hasread},
        };

        /**
         * 获取一级标签中二级标签的内容
         */
        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return child_text[groupPosition][childPosition];
        }

        /**
         * 获取二级标签ID
         */
        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return childPosition;
        }
        /**
         * 对一级标签下的二级标签进行设置
         */
        @SuppressLint("SimpleDateFormat")
        @Override
        public View getChildView(int groupPosition, int childPosition,
                boolean isLastChild, View convertView, ViewGroup parent) {
            convertView=getLayoutInflater().inflate(R.layout.email_child, null);
            TextView tv=(TextView) convertView.findViewById(R.id.tv);
            tv.setText(child_text[groupPosition][childPosition]);

            ImageView iv=(ImageView) convertView.findViewById(R.id.child_icon);
            iv.setImageResource(child_icons[groupPosition][childPosition]);
            return convertView;
        }

        /**
         * 一级标签下二级标签的数量
         */
        @Override
        public int getChildrenCount(int groupPosition) {
            return child_text[groupPosition].length;
        }

        /**
         * 获取一级标签内容
         */
        @Override
        public Object getGroup(int groupPosition) {
            return group_title[groupPosition];
        }

        /**
         * 一级标签总数
         */
        @Override
        public int getGroupCount() {
            return group_title.length;
        }

        /**
         * 一级标签ID
         */
        @Override
        public long getGroupId(int groupPosition) {
            return groupPosition;
        }
        /**
         * 对一级标签进行设置
         */
        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                View convertView, ViewGroup parent) {
            convertView=getLayoutInflater().inflate(R.layout.email_group, null);

            ImageView icon=(ImageView) convertView.findViewById(R.id.icon);
            ImageView iv=(ImageView) convertView.findViewById(R.id.iv);
            TextView tv=(TextView) convertView.findViewById(R.id.iv_title);

            iv.setImageResource(R.drawable.group_right);
            tv.setText(group_title[groupPosition]);

            if(groupPosition==0){
                icon.setImageResource(R.drawable.constants);
            }else if(groupPosition==1){
                icon.setImageResource(R.drawable.mailto);
            }else if(groupPosition==2){
                icon.setImageResource(R.drawable.mailbox);
            }

            if(group_click[groupPosition]%2==0){
                iv.setImageResource(R.drawable.group_right);
            }else{
                iv.setImageResource(R.drawable.group_down);
            }


            return convertView;
        }
        /**
         * 指定位置相应的组视图
         */
        @Override
        public boolean hasStableIds() {
            return true;
        }

        /**
         *  当选择子节点的时候，调用该方法
         */
        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }

    }

    /**
     * 返回退出系统
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if(keyCode==KeyEvent.KEYCODE_BACK){
            if((System.currentTimeMillis()-mExitTime)<2000){
                android.os.Process.killProcess(android.os.Process.myPid());
            }else{
                Toast.makeText(MainActivity.this, "再按一次退出程序", Toast.LENGTH_SHORT).show();
                mExitTime=System.currentTimeMillis();
            }
            return true;
        }
        return super.onKeyDown(keyCode, event);
    }
}

收件箱

package com.zj.myemail;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.BaseAdapter;
import android.widget.DialerFilter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.lang.ref.WeakReference;
import java.security.Security;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import javax.mail.FetchProfile;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.Session;
import javax.mail.Store;
import javax.mail.URLName;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeUtility;


public class MailBoxActivity extends Activity {

    private ArrayList mailslist = new ArrayList();
    private ArrayList> attachmentsInputStreamsList = new ArrayList>();
    private String type;
    private int status;
    private MyAdapter myAdapter;
    private ListView lv_box;
    //private List mailReceivers;
    private ProgressDialog dialog;

    private List messageids;
    private Handler handler=new Handler(){
        public void handleMessage(android.os.Message msg) {
            dialog.dismiss();

             myAdapter = new MyAdapter();
             lv_box.setAdapter(myAdapter);
        };

    };
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);


        setContentView(R.layout.email_mailbox);
        initView();

    }

    private void initView() {
        lv_box = (ListView) findViewById(R.id.lv_box);


        dialog=new ProgressDialog(this);
        dialog.setMessage("正加载");
        dialog.show();


        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());    
         final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";    

          // Get a Properties object    
          Properties props = System.getProperties();    
          props.setProperty("mail.pop3.socketFactory.class", SSL_FACTORY);    
         props.setProperty("mail.pop3.socketFactory.fallback", "false");    
          props.setProperty("mail.pop3.port", "995");    
          props.setProperty("mail.pop3.socketFactory.port", "995");    

          //以下步骤跟一般的JavaMail操作相同    
          final Session session = Session.getDefaultInstance(props,null);    

         //请将红色部分对应替换成你的邮箱帐号和密码    
         final URLName urln = new URLName("pop3","pop.qq.com",995,null,    
           "[e-mail]", "yourpassword");   



         new Thread(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                 Store store=null;
                  Folder inbox = null; 
                try { 

                     store = session.getStore(urln);    

                     Log.i("test","here1");
                       store.connect();    
                       Log.i("test","here2");
                       inbox = store.getFolder("INBOX");    
                       inbox.open(Folder.READ_ONLY);    
                       FetchProfile profile = new FetchProfile();    
                       profile.add(FetchProfile.Item.ENVELOPE);    
                       Message[] messages = inbox.getMessages();    
                      inbox.fetch(messages, profile);  
                      Log.i("test",messages.length+"");
                       System.out.println("收件箱的邮件数：" + messages.length);    
                       for (int i = 0; i < messages.length; i++) {    
                       //邮件发送者    
                       String from = decodeText(messages[i].getFrom()[0].toString());    
                        InternetAddress ia = new InternetAddress(from);    
                       System.out.println("FROM:" + ia.getPersonal()+'('+ia.getAddress()+')');    
                        //邮件标题    
                        System.out.println("TITLE:" + messages[i].getSubject());    
                        //邮件大小    
                        System.out.println("SIZE:" + messages[i].getSize());    
                        //邮件发送时间    
                        System.out.println("DATE:" + messages[i].getSentDate());   
                        Email email=new Email();
                        email.setFrom(ia.getPersonal()+'('+ia.getAddress()+')');
                        email.setSubject( messages[i].getSubject());
                        email.setSentdata(messages[i].getSentDate()+"");

                       mailslist.add(email);

                       }    

                       handler.sendEmptyMessage(0);
                      } catch(Exception e)
                      {

                      }
                      finally {    
                       try {    
                        inbox.close(false);    
                      } catch (Exception e) {}    
                      try {    
                        store.close();    
                       } catch (Exception e) {}    
                      }  
            }
        }).start();

    }

    protected static String decodeText(String text)    
               throws UnsupportedEncodingException {    
              if (text == null)    
               return null;    
             if (text.startsWith("=?GB") || text.startsWith("=?gb"))    
              text = MimeUtility.decodeText(text);    
             else    
              text = new String(text.getBytes("ISO8859_1"));    
             return text;    
            }    



    /**
     * 适配器
     * @author Administrator
     *
     */
    private class MyAdapter extends BaseAdapter {
        @Override
        public int getCount() {
            return mailslist.size();
        }

        @Override
        public Object getItem(int position) {
            return mailslist.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            convertView = LayoutInflater.from(MailBoxActivity.this).inflate(R.layout.email_mailbox_item, null);

            TextView tv_from = (TextView) convertView.findViewById(R.id.tv_from);
            tv_from.setText(mailslist.get(position).getFrom());

            TextView tv_sentdate = (TextView) convertView.findViewById(R.id.tv_sentdate);
            tv_sentdate.setText(mailslist.get(position).getSentdata());

            TextView tv_subject = (TextView) convertView.findViewById(R.id.tv_subject);
            tv_subject.setText(mailslist.get(position).getSubject());

            return convertView;
        }

    }



}

发送邮件

package com.zj.myemail;

import java.security.Security;
import java.util.Date;
import java.util.Properties;

import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.view.KeyEvent;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Toast;





public class MailEditActivity extends Activity {
    private EditText mail_to;
    private EditText mail_from;
    private EditText mail_topic;
    private EditText mail_content;

    private Button send;
    private ImageButton add_lianxiren;
    private ImageButton attachment;


    private int mailid = -1;

    private static final int SUCCESS = 1;
    private static final int FAILED = -1;
    private boolean isCaogaoxiang = true;
    private ProgressDialog dialog;

    Handler handler = new Handler() {

        public void handleMessage(android.os.Message msg) {
            dialog.dismiss();
            Toast.makeText(MailEditActivity.this, "发送成功", 0).show();
        };
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        requestWindowFeature(Window.FEATURE_NO_TITLE);
        super.onCreate(savedInstanceState);
        setContentView(R.layout.email_writer);
        init();
    }

    /**
     * 初始化
     */
    private void init() {
        mail_to = (EditText) findViewById(R.id.mail_to);
        mail_from = (EditText) findViewById(R.id.mail_from);
        mail_topic = (EditText) findViewById(R.id.mail_topic);
        mail_content = (EditText) findViewById(R.id.content);
        send = (Button) findViewById(R.id.send);
        attachment = (ImageButton) findViewById(R.id.add_att);
        add_lianxiren = (ImageButton) findViewById(R.id.add_lianxiren);

        mail_from.setText("[e-mail]");
        mail_to.setText("[e-mail]");

    }

    public void mySend(View view) {
        Toast.makeText(getApplicationContext(), "正在发送", 0).show();
        sendMail();
    }

    /**
     * 设置邮件数据
     */
    private void sendMail() {

        dialog = new ProgressDialog(this);
        dialog.setMessage("正在发送");
        dialog.show();
        new Thread(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                try {
                    Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
                    final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory";
                    // Get a Properties object
                    Properties props = System.getProperties();
                    props.setProperty("mail.smtp.host", "smtp.qq.com");
                    props.setProperty("mail.smtp.socketFactory.class",
                            SSL_FACTORY);
                    props.setProperty("mail.smtp.socketFactory.fallback",
                            "false");
                    props.setProperty("mail.smtp.port", "465");
                    props.setProperty("mail.smtp.socketFactory.port", "465");
                    props.put("mail.smtp.auth", "true");
                    final String username = "yourusername";
                    final String password = "yourpassword";
                    Session session = Session.getDefaultInstance(props,
                            new Authenticator() {
                                protected PasswordAuthentication getPasswordAuthentication() {
                                    return new PasswordAuthentication(username,
                                            password);
                                }
                            });

                    // -- Create a new message --
                    final Message msg = new MimeMessage(session);

                    // -- Set the FROM and TO fields --
                    msg.setFrom(new InternetAddress(username + "@qq.com"));

                    msg.setRecipient(Message.RecipientType.TO, new InternetAddress(mail_to.getText().toString()));
                    msg.setSubject(mail_topic.getText().toString());
                    msg.setText(mail_content.getText().toString());
                    msg.setSentDate(new Date());

                    Transport.send(msg);
                    handler.sendEmptyMessage(0);
                } catch (MessagingException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            }
        }).start();

        System.out.println("Message sent.");

    }

    /**
     * /** 返回
     * 
     * @param v
     */
    public void back(View v) {
        finish();

    }

    /**
     * 返回按钮
     */
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        finish();
        return super.onKeyDown(keyCode, event);
    }

}