我希望能够通过电子邮件发送消息，而不使用intent。当我按下按钮时，弹出的不是“电子邮件已成功发送”的提示信息，而是显示“电子邮件未发送”，并且没有发送电子邮件。请问有人能够帮助我解决这个问题吗？
MainActivity.java
@SuppressLint("SdCardPath")
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.activity_main);
Button addImage = (Button) findViewById(R.id.send_email);
addImage.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Mail m = new Mail("gmailusername@gmail.com", "password");
String[] toArr = {"lp.mar@gmail.com"};
m.setTo(toArr);
m.setFrom("p.mar@gmail.com");
m.setSubject("Email Test");
m.setBody("This is an email sent using my Mail JavaMail wrapper from an Android device.");
try {
m.addAttachment("/sdcard/filelocation");
if(m.send()) {
Toast.makeText(MainActivity.this, "Email was sent successfully.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this, "Email was not sent.", Toast.LENGTH_LONG).show();
}
} catch(Exception e) {
//Toast.makeText(MailApp.this, "There was a problem sending the email.", Toast.LENGTH_LONG).show();
Log.e("MailApp", "Could not send email", e);
}
}
});
}
Mail.java
public Mail() {
_host = "smtp.gmail.com"; // default smtp server
_port = "465"; // default smtp port
_sport = "465"; // default socketfactory port
_user = ""; // username
_pass = ""; // password
_from = ""; // email sent from
_subject = ""; // email subject
_body = ""; // email body
_debuggable = false; // debug mode on or off - default off
_auth = true; // smtp authentication - default on
_multipart = new MimeMultipart();
// There is something wrong with MailCap, javamail can not find a handler for the multipart/mixed part, so this bit needs to be added.
MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
CommandMap.setDefaultCommandMap(mc);
}
public Mail(String user, String pass) {
this();
_user = user;
_pass = pass;
}
public boolean send() throws Exception {
Properties props = _setProperties();
if(_user.equals("") && _pass.equals("") && _to.length > 0 && _from.equals("") && _subject.equals("") && _body.equals("")) {
Session session = Session.getInstance(props, this);
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(_from));
InternetAddress[] addressTo = new InternetAddress[_to.length];
for (int i = 0; i < _to.length; i++) {
addressTo[i] = new InternetAddress(_to[i]);
}
msg.setRecipients(MimeMessage.RecipientType.TO, addressTo);
msg.setSubject(_subject);
msg.setSentDate(new Date());
// setup message body
BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(_body);
_multipart.addBodyPart(messageBodyPart);
// Put parts in message
msg.setContent(_multipart);
// send email
Transport.send(msg);
return true;
} else {
return false;
}
}
public void addAttachment(String filename) throws Exception {
BodyPart messageBodyPart = new MimeBodyPart();
DataSource source = new FileDataSource(filename);
messageBodyPart.setDataHandler(new DataHandler(source));
messageBodyPart.setFileName(filename);
_multipart.addBodyPart(messageBodyPart);
}
@Override
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(_user, _pass);
}
private Properties _setProperties() {
Properties props = new Properties();
props.put("mail.smtp.host", _host);
if(_debuggable) {
props.put("mail.debug", "true");
}
if(_auth) {
props.put("mail.smtp.auth", "true");
}
props.put("mail.smtp.port", _port);
props.put("mail.smtp.socketFactory.port", _sport);
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.fallback", "false");
return props;
}
Logcat
06-20 17:01:16.889: E/MailApp(7081): Could not send email
06-20 17:01:16.889: E/MailApp(7081): java.lang.NullPointerException
06-20 17:01:16.889: E/MailApp(7081): at java.util.Hashtable.put(Hashtable.java:365)
06-20 17:01:16.889: E/MailApp(7081): at com.example.emailtest.Mail._setProperties(Mail.java:117)
06-20 17:01:16.889: E/MailApp(7081): at com.example.emailtest.Mail.send(Mail.java:72)
06-20 17:01:16.889: E/MailApp(7081): at com.example.emailtest.MainActivity$1.onClick(MainActivity.java:36)
06-20 17:01:16.889: E/MailApp(7081): at android.view.View.performClick(View.java:3558)
06-20 17:01:16.889: E/MailApp(7081): at android.view.View$PerformClick.run(View.java:14157)
06-20 17:01:16.889: E/MailApp(7081): at android.os.Handler.handleCallback(Handler.java:605)
06-20 17:01:16.889: E/MailApp(7081): at android.os.Handler.dispatchMessage(Handler.java:92)
06-20 17:01:16.889: E/MailApp(7081): at android.os.Looper.loop(Looper.java:137)
06-20 17:01:16.889: E/MailApp(7081): at android.app.ActivityThread.main(ActivityThread.java:4514)
06-20 17:01:16.889: E/MailApp(7081): at java.lang.reflect.Method.invokeNative(Native Method)
06-20 17:01:16.889: E/MailApp(7081): at java.lang.reflect.Method.invoke(Method.java:511)
06-20 17:01:16.889: E/MailApp(7081): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
06-20 17:01:16.889: E/MailApp(7081): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
06-20 17:01:16.889: E/MailApp(7081): at dalvik.system.NativeStart.main(Native Method)
send()函数中的if语句是正确的吗？如果_user、_pass、_from、_subject和_body都是空字符串，似乎没有意义尝试发送电子邮件。我期望的是相反的情况：它们应该 不 是空的。 - MH.