Setup

1. Add to build.gradle in app level

   implementation 'com.github.tntkhang:gmail-sender-library:1.3.0'
   

2. How to use it

   GMailSender.withAccount("your-email@gmail.com", "email-password")
                .withTitle(title)
                .withBody(body)
                .withSender(getString(R.string.app_name))
                .toEmailAddress(emailAddress) // one or multiple addresses separated by a comma
                .withListenner(new GmailListener() {
                    @Override
                    public void sendSuccess() {
                        Toast.makeText(MainActivity.this, "Success", Toast.LENGTH_SHORT).show();
                    }
   
                    @Override
                    public void sendFail(String err) {
                        Toast.makeText(MainActivity.this, "Fail: " + err, Toast.LENGTH_SHORT).show();
                    }
                })
                .send();
   

3. IMPORTANT ! Enable less secure for the email using to sent email: https://support.google.com/accounts/answer/6010255?hl=en
4. Add those line into pro-guard

   # Required for GmailSender
   -dontwarn java.awt.**
   -dontwarn java.beans.Beans
   -dontwarn javax.security.**
   -keep class javamail.** {*;}
   -keep class javax.mail.** {*;}
   -keep class javax.activation.** {*;}
   -keep class com.sun.mail.dsn.** {*;}
   -keep class com.sun.mail.handlers.** {*;}
   -keep class com.sun.mail.smtp.** {*;}
   -keep class com.sun.mail.util.** {*;}
   -keep class mailcap.** {*;}
   -keep class mimetypes.** {*;}
   -keep class myjava.awt.datatransfer.** {*;}
   -keep class org.apache.harmony.awt.** {*;}
   -keep class org.apache.harmony.misc.** {*;}
   

5. Enjoy

Checkout example if you need a demo.