Question

我正在尝试在应用程序中发送邮件。我不会弹出与用户的任何互动。我有两个java代码。

MainActivity.java

package com.example.test;

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

public class MainActivity extends Activity {
public static String EXTRA_MESSAGE = "com.example.MESSAGE";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main, menu);
    return super.onCreateOptionsMenu(menu);

}

public void sendMessage(View view)
{
    try {   
        test sender = new test();
        sender.send();
        Toast.makeText(getApplicationContext(), "Message Sent!!! :)", Toast.LENGTH_LONG).show();
    } catch (Exception e) {   
        //Log.e("SendMail", e.getMessage(), e);   
    } 
}

public void exit(View view)
{
    System.exit(0);
}    
}

test.java

package com.example.test;

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;

import android.widget.Toast;

public class test extends MainActivity
{
public void send()
{
    String host = "smtp.gmail.com";
String from = "MYUSERNAME";
String pass = "MYPASS";
try
{
Properties props = new Properties();
props.put("mail.smtp.starttls.enable", "true"); // added this line
props.put("mail.smtp.host", host);
props.put("mail.smtp.user", from);
props.put("mail.smtp.password", pass);
props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");

String[] to = {"ADDRESSTOSEND@gmail.com"}; // added this line

Session session = Session.getDefaultInstance(props, null);
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(from));

InternetAddress[] toAddress = new InternetAddress[to.length];

// To get the array of addresses
for( int i=0; i < to.length; i++ ) { // changed from a while loop
    toAddress[i] = new InternetAddress(to[i]);
}
System.out.println(Message.RecipientType.TO);

for( int i=0; i < toAddress.length; i++) { // changed from a while loop
    message.addRecipient(Message.RecipientType.TO, toAddress[i]);
}
message.setSubject("This is subject");
message.setText("Welcome to your mail");
Transport transport = session.getTransport("smtp");
transport.connect(host, from, pass);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
}
catch(Exception e)
{
    Toast.makeText(getApplicationContext(), "Error" + e, Toast.LENGTH_LONG).show();
}
}
}

按下发送按钮时无法发送邮件。我使用xml onClick调用了sendMessage（）。

日食中没有错误。该项目编译，安装但我没有收到邮件。当我使用javac尝试使用java并运行test.java时，它可以正常运行。我收到了帐户中的邮件。

感谢您的帮助。

Answer 1

只需使用此代码

            Intent i = new Intent(Intent.ACTION_SEND);

                        i.setType("message/rfc822");
                        i.putExtra(Intent.EXTRA_EMAIL, new String[] { "abc@gmail.com" });
                        i.putExtra(Intent.EXTRA_SUBJECT, headline);
                        i.putExtra(Intent.EXTRA_TEXT, source);
                        try {
                            activity.startActivity(Intent.createChooser(i,"Send mail..."));
                        } catch (android.content.ActivityNotFoundException ex) {
                        }

Answer 2

你有吗

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

在您的应用程序清单文件中？

编辑1：

如何改变

Session session = Session.getDefaultInstance(props, null);

到

Session session = Session.getDefaultInstance(props, new MailAuthenticator(from, pass));

Answer 3

我没有尝试过您的发送代码，但是获取上下文的方式会引发空指针。

可能在getApplicationContext()行的Toast.makeText(getApplicationContext(), "Error" + e, Toast.LENGTH_LONG).show();中引发了NullPointerException。您不应该扩展活动以获取上下文。使用构造函数将上下文传递给Test类。

例如：

public class Test {
    private Context cntxt;

    public Test(Context context){
        this.cntxt = context;
    }
    public void send() {
        //Code to send
        //And when you need the context you use the cntxt
        Toast.makeText(cntxt, "Error" + e, Toast.LENGTH_LONG).show()
    }
}

还要记住，声明以大写字母开头的类名是一种很好的做法和惯例。您应该将测试重命名为Test。

无法使用Android代码发送邮件

3 个答案: