RohanNavlakhe2

 String[] emailContent = {"Hii Abhi!","Here is my new article","[email protected]"};
        
        Observable.just(emailContent)
                .map(emailData -> {

                    GMailSender sender = new GMailSender("[email protected]",
                            "password");
                    sender.sendMail(emailData[0], emailData[1],
                            "senderemailid",emailData[2]);
                    return "Email Successfully sent";

RohanNavlakhe2

public class SendMailAsynchronously extends AsyncTask<String,String,String>
{
    private Context context;
    
    public SendMailAsynchronously(Context context)
    {
        this.context=context;
    }
    
    @Override

RohanNavlakhe2

//RxJava and RxAndroid
 
implementation 'io.reactivex.rxjava2:rxjava:2.0.7'

// Because RxAndroid releases are few and far between, it is recommended you also
// explicitly depend on RxJava's latest version for bug fixes and new features.
 
implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'

RohanNavlakhe2

System.out.println("r");