我可以使用GoogleSignInApi和SMTP服务器(如果可能)或其他方式发送没有密码的电子邮件吗？

Question

我正在创建一个简单的安卓应用程序为盲人发送电子邮件，这对语音输入的工作。应用程序不与正常的gmail/电子邮件应用程序交互来发送邮件。我使用GoogleSignInApi来避免无效的电子邮件id和静态/动态输入发件人的电子邮件和密码(安全目的)。使用GoogleSignInApi我可以获取电子邮件地址，但主要问题是我无法从应用程序接口获取密码，因此我无法发送电子邮件。Android下可以不使用密码发送邮件吗？

提前谢谢..

MainActivity.java

private void handleResult(GoogleSignInResult result)
{
    if(result.isSuccess())
    {
        GoogleSignInAccount account = result.getSignInAccount();
        String name = account.getDisplayName();
        String email =  account.getEmail();
        String img_url=account.getPhotoUrl().toString();
        Name.setText(name);
        Email.setText(email);
        Glide.with(this).load(img_url).into(Prof_pic);
        updateUI(true);
    }
}

Config.java

//For storing email address and password of sender

public class Config 
{

    public static String EMAIL ="youremail@gmail.com";  //gmail address

    public static String PASSWORD ="passwd"; //password
}

SendMail.java

public class SendMail extends AsyncTask<Void,Void,Void> {

    //Declaring Variables
    private Context context;
    private Session session;

    //Information to send email
    private String email;
    private String subject;
    private String message;
    private TextToSpeech t1;

    //Progressdialog to show while sending email
    private ProgressDialog progressDialog;


    //Class Constructor
    public SendMail(Context context, String email, String subject, String message){
        //Initializing variables
        this.context = context;
        this.email = email;
        this.subject = subject;
        this.message = message;
        t1=new TextToSpeech(context, new TextToSpeech.OnInitListener() {
            @Override
            public void onInit(int status) {
                if(status != TextToSpeech.ERROR) {
                    t1.setLanguage(Locale.UK);
                }
            }
        });
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        //Showing progress dialog while sending email
        progressDialog = ProgressDialog.show(context,"Sending message","Please wait...",false,false);

    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        //Dismissing the progress dialog
        progressDialog.dismiss();
        //Showing a success message
        Toast.makeText(context,"Message Sent",Toast.LENGTH_LONG).show();
        t1.speak("Message Sent", TextToSpeech.QUEUE_FLUSH, null);
    }

    @Override
    protected Void doInBackground(Void... params) {
        //Creating properties
        Properties props = new Properties();
        props.setProperty("mail.transport.protocol", "smtp");

        props.setProperty("mail.host", "smtp.gmail.com");

        props.put("mail.smtp.auth", "true");

        props.put("mail.smtp.port", "465");

        props.put("mail.smtp.socketFactory.port", "465");

        props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");

        props.put("mail.smtp.socketFactory.fallback", "false");

        props.setProperty("mail.smtp.quitwait", "false");

        //Configuring properties for gmail
        //If you are not using gmail you may need to change the values
        //props.put("mail.smtp.host", "smtp.gmail.com");
        //props.put("mail.smtp.socketFactory.port", "465");
        //props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
        //props.put("mail.smtp.auth", "true");
        //props.put("mail.smtp.port", "465");

        //Creating a new session
        session = Session.getDefaultInstance(props, new javax.mail.Authenticator() {
                    //Authenticating the password
                    protected PasswordAuthentication getPasswordAuthentication() {
                        return new PasswordAuthentication(Config.EMAIL,Config.PASSWORD);
                    }
                });

        try {
            //Creating MimeMessage object
            MimeMessage mm = new MimeMessage(session);

            //Setting sender address
            mm.setFrom(new InternetAddress(Config.EMAIL));
            //Adding receiver
            mm.addRecipient(Message.RecipientType.TO, new InternetAddress(email));
            //Adding subject
            mm.setSubject(subject);

            //Adding message
            mm.setText(message);

            //Sending email
            Transport.send(mm);

        } catch (MessagingException e) {
            e.printStackTrace();
        }
        return null;
    }
}

Answer 1

在安卓系统下可以不使用密码发送邮件吗？

不是的。否则，垃圾邮件发送者只会使用Android设备发送电子邮件。

您正在创建电子邮件客户端。电子邮件客户端需要帐户凭据和服务器信息(SMTP、IMAP等)以便发送和接收电子邮件。

您可以考虑将您的功能添加到现有的开源电子邮件客户端(例如，K9邮件)，或者至少使用其中一个作为您的应用程序作为电子邮件客户端所需的各种东西的指南。