Android SDK: How To Send Email Without User Interaction Using SMTP

package com.yoursite.automaticemail;


import java.util.Date; 
import java.util.Properties; 
import javax.activation.CommandMap; 
import javax.activation.DataHandler; 
import javax.activation.DataSource; 
import javax.activation.FileDataSource; 
import javax.activation.MailcapCommandMap; 
import javax.mail.BodyPart; 
import javax.mail.Multipart; 
import javax.mail.PasswordAuthentication; 
import javax.mail.Session; 
import javax.mail.Transport; 
import javax.mail.internet.InternetAddress; 
import javax.mail.internet.MimeBodyPart; 
import javax.mail.internet.MimeMessage; 
import javax.mail.internet.MimeMultipart; 


public class Mail extends javax.mail.Authenticator { 
	private String _user; 
	private String _pass; 

	private String[] _to; 
	private String _from; 

	private String _port; 
	private String _sport; 

	private String _host; 

	private String _subject; 
	private String _body; 

	private boolean _auth; 

	private boolean _debuggable; 

	private Multipart _multipart; 


	public Mail() { 
		_host = "smtp.gmail.com"; // default smtp server 
		_port = "465"; // default smtp port 
		_sport = "465"; // default socketfactory port 

		_user = ""; // username 
		_pass = ""; // password 
		_from = ""; // email sent from 
		_subject = ""; // email subject 
		_body = ""; // email body 

		_debuggable = false; // debug mode on or off - default off 
		_auth = true; // smtp authentication - default on 

		_multipart = new MimeMultipart(); 

		// There is something wrong with MailCap, javamail can not find a handler for the multipart/mixed part, so this bit needs to be added. 
		MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap(); 
		mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html"); 
		mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml"); 
		mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain"); 
		mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed"); 
		mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822"); 
		CommandMap.setDefaultCommandMap(mc); 
	} 

	public Mail(String user, String pass) { 
		this(); 

		_user = user; 
		_pass = pass; 
	} 

	public boolean send() throws Exception { 
		Properties props = _setProperties(); 

		if(!_user.equals("") && !_pass.equals("") && _to.length > 0 && !_from.equals("") && !_subject.equals("") && !_body.equals("")) { 
			Session session = Session.getInstance(props, this); 

			MimeMessage msg = new MimeMessage(session); 

			msg.setFrom(new InternetAddress(_from)); 

			InternetAddress[] addressTo = new InternetAddress[_to.length]; 
			for (int i = 0; i < _to.length; i++) { 
				addressTo[i] = new InternetAddress(_to[i]); 
			} 
			msg.setRecipients(MimeMessage.RecipientType.TO, addressTo); 

			msg.setSubject(_subject); 
			msg.setSentDate(new Date()); 

			// setup message body 
			BodyPart messageBodyPart = new MimeBodyPart(); 
			messageBodyPart.setText(_body); 
			_multipart.addBodyPart(messageBodyPart); 

			// Put parts in message 
			msg.setContent(_multipart); 

			// send email 
			Transport.send(msg); 

			return true; 
		} else { 
			return false; 
		} 
	} 

	public void addAttachment(String filename) throws Exception { 
		BodyPart messageBodyPart = new MimeBodyPart(); 
		DataSource source = new FileDataSource(filename); 
		messageBodyPart.setDataHandler(new DataHandler(source)); 
		messageBodyPart.setFileName(filename); 

		_multipart.addBodyPart(messageBodyPart); 
	} 

	@Override 
	public PasswordAuthentication getPasswordAuthentication() { 
		return new PasswordAuthentication(_user, _pass); 
	} 

	private Properties _setProperties() { 
		Properties props = new Properties(); 

		props.put("mail.smtp.host", _host); 

		if(_debuggable) { 
			props.put("mail.debug", "true"); 
		} 

		if(_auth) { 
			props.put("mail.smtp.auth", "true"); 
		} 

		props.put("mail.smtp.port", _port); 
		props.put("mail.smtp.socketFactory.port", _sport); 
		props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 
		props.put("mail.smtp.socketFactory.fallback", "false"); 

		return props; 
	} 

	// the getters and setters 
	public String getBody() { 
		return _body; 
	} 

	public void setBody(String _body) { 
		this._body = _body; 
	} 

	public void setTo(String[] toArr) {
		this._to = toArr;
	}

	public void setFrom(String string) {
		this._from = string;
	}

	public void setSubject(String string) {
		this._subject = string;
	}

	// more of the getters and setters ….. 
} 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<Button android:id="@+id/send_email"
	android:layout_width="fill_parent"
	android:layout_height="wrap_content"
	android:text="Send Email"
	android:onClick="sendEmail"/>
</LinearLayout>

Android Permissions Needed

The only permission we need is internet access.

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.yoursite.automaticemail"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".AutomaticEmailActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>
    
    <uses-permission android:name="android.permission.INTERNET"/>
    
</manifest>

package com.yoursite.automaticemail;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class AutomaticEmailActivity extends Activity {
	private Mail m;
	/** Called when the activity is first created. */
	@Override 
	public void onCreate(Bundle savedInstanceState) { 
		super.onCreate(savedInstanceState); 
		setContentView(R.layout.main); 
		m = new Mail("yourEmail@domain.tld", "yourpassword"); 
	}

	public void sendEmail(View view){
		String[] toArr = {"toemail1@domain1.tld"}; // This is an array, you can add more emails, just separate them with a coma
		m.setTo(toArr); // load array to setTo function
		m.setFrom("fromEmail@domain.tld"); // who is sending the email 
		m.setSubject("subject"); 
		m.setBody("your message goes here"); 

		try { 
			m.addAttachment("/sdcard/myPicture.jpg");  // path to file you want to attach
			if(m.send()) { 
				// success
				Toast.makeText(AutomaticEmailActivity.this, "Email was sent successfully.", Toast.LENGTH_LONG).show(); 
			} else { 
				// failure
				Toast.makeText(AutomaticEmailActivity.this, "Email was not sent.", Toast.LENGTH_LONG).show(); 
			} 
		} catch(Exception e) { 
			// some other problem
			Toast.makeText(AutomaticEmailActivity.this, "There was a problem sending the email.", Toast.LENGTH_LONG).show(); 
		} 

	}
}