Automatic mail sending in android studio

To send automatic emails in Android Studio, you can use the JavaMail API. Here's a step-by-step guide to help you get started:

Step 1: Add the JavaMail API to your project

Open your Android Studio project and go to the build.gradle file.
Add the following dependency to the dependencies section:
```
implementation 'com.sun.mail:android-mail:1.6.2'
```
Sync your project by clicking on the "Sync Now" button or by running the command gradle sync in the terminal.

Step 2: Create a JavaMail session

Create a new Java class in your Android project, e.g., EmailSender.java.

Import the necessary classes:

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

Create a JavaMail session:

public class EmailSender {
  public static void sendEmail(String from, String password, String to, String subject, String body) {
      Properties props = new Properties();
      props.put("mail.smtp.host", "smtp.gmail.com");
      props.put("mail.smtp.port", 587);
      props.put("mail.smtp.auth", "true");
      props.put("mail.smtp.starttls.enable", "true");

      Session session = Session.getInstance(props, new Authenticator() {
          @Override
          protected PasswordAuthentication getPasswordAuthentication() {
              return new PasswordAuthentication(from, password);
          }
      });
  }
}

Step 3: Send the email

Use the sendEmail method to send the email:

EmailSender.sendEmail("[email protected]", "your-password", "[email protected]", "Subject", "Body");

Make sure to replace the placeholders with your actual email address, password, recipient's email address, subject, and body.

Step 4: Schedule the email sending

To send the email automatically, you can use a scheduling library like AlarmManager or JobScheduler.

For example, you can use AlarmManager to schedule the email sending at a specific time:

AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(this, EmailSender.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 10000, pendingIntent);

This code will send the email 10 seconds from now.

Note: Make sure to handle exceptions and errors properly when sending emails. Also, be aware of the limitations and restrictions of the email service provider you are using.

Here's the complete code:

import javax.mail.*;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;

public class EmailSender {
    public static void sendEmail(String from, String password, String to, String subject, String body) {
        Properties props = new Properties();
        props.put("mail.smtp.host", "smtp.gmail.com");
        props.put("mail.smtp.port", 587);
        props.put("mail.smtp.auth", "true");
        props.put("mail.smtp.starttls.enable", "true");

        Session session = Session.getInstance(props, new Authenticator() {
            @Override
            protected PasswordAuthentication getPasswordAuthentication() {
                return new PasswordAuthentication(from, password);
            }
        });

        try {
            Message message = new MimeMessage(session);
            message.setFrom(new InternetAddress(from));
            message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
            message.setSubject(subject);
            message.setText(body);

            Transport.send(message);
        } catch (MessagingException e) {
            throw new RuntimeException(e);
        }
    }

    public static void scheduleEmailSending(Context context, String from, String password, String to, String subject, String body) {
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        Intent intent = new Intent(context, EmailSender.class);
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
        alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis() + 10000, pendingIntent);
    }
}

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Automatic mail sending in android studio