Email 源码解析-- MailTransport ( socket , SocketAddress )

      在Email的登录界面，需要配置各种的邮箱。其通信是使用的socket方式进行，具体代码可以参考MailTransport的open方法。

      转载请注明http://ishelf.iteye.com/blog/1022652

    /**
     * Attempts to open a connection using the Uri supplied for connection parameters.  Will attempt
     * an SSL connection if indicated.
     */
    public void open() throws MessagingException, CertificateValidationException {
        if (Config.LOGD && Email.DEBUG) {
            Log.d(Email.LOG_TAG, "*** " + mDebugLabel + " open " + 
                    getHost() + ":" + String.valueOf(getPort()));
        }

        try {
            SocketAddress socketAddress = new InetSocketAddress(getHost(), getPort());
            if (canTrySslSecurity()) {
                mSocket = SSLUtils.getSSLSocketFactory(canTrustAllCertificates()).createSocket();
            } else {
                mSocket = new Socket();
            }
            mSocket.connect(socketAddress, SOCKET_CONNECT_TIMEOUT);
            mIn = new BufferedInputStream(mSocket.getInputStream(), 1024);
            mOut = new BufferedOutputStream(mSocket.getOutputStream(), 512);
            
        } catch (SSLException e) {
            if (Config.LOGD && Email.DEBUG) {
                Log.d(Email.LOG_TAG, e.toString());
            }
            throw new CertificateValidationException(e.getMessage(), e);
        } catch (IOException ioe) {
            if (Config.LOGD && Email.DEBUG) {
                Log.d(Email.LOG_TAG, ioe.toString());
            }
            throw new MessagingException(MessagingException.IOERROR, ioe.toString());
        }
    }

 

      这是一个很典型的java语言的socket通信，不过android的Email通信和gmail通信还有尚邮（第三方应用）有一些区别，表现主要在两个地方：1.数据加载方式，email的邮件提取是通过两次通信实现的，而gmail和尚邮的方式应该是类似的，是通过一次通信实现的，两次加载的优缺点主要就是表现在大附件显示（音乐，视频等）这里，大家可以用尚邮试试。

 

 

     下面给出一个socket通信的test类

 

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.net.SocketAddress;

public class SocketTest extends Activity {
    /** Called when the activity is first created. */
    public static String LOG_TAG = "SocketTest";

    private Socket mSocket;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        SocketAddress socketAddress = new InetSocketAddress("imap.gmail.com", 995);
        Log.d(LOG_TAG, "socketAddress :" + socketAddress.toString());
        mSocket = new Socket();
        Log.d(LOG_TAG, "" + mSocket.toString());

        Log.d(LOG_TAG, "mSocket conneted");
        try {
            mSocket.connect(socketAddress, 10000);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            Log.d(LOG_TAG,e.getMessage());
        }
        // After the socket connects to an SSL server, confirm that the hostname
        // is as expected
        Log.d(LOG_TAG, "mSocket conneted ...........");

    }
}

 

 

     下次分析一下Email的附件提取方式。android2.2和1.6两个版本的最大区别在于附件的提取，不过同名附件无法同时收取的问题还是没有解决。