Implement References/In-Reply-To/X-User-Agen. Fixes issue 42. Patch from e.w.stemle

src/com/android/email/activity/MessageCompose.java

@@ -127,6 +127,9 @@ public class MessageCompose extends K9Activity implements OnClickListener, OnFoc
     private View mQuotedTextBar;
     private ImageButton mQuotedTextDelete;
     private EditText mQuotedText;
+    
+    private String mReferences;
+    private String mInReplyTo;
 
     private boolean mDraftNeedsSaving = false;
 
@@ -640,8 +643,16 @@ public class MessageCompose extends K9Activity implements OnClickListener, OnFoc
         message.setRecipients(RecipientType.CC, getAddresses(mCcView));
         message.setRecipients(RecipientType.BCC, getAddresses(mBccView));
         message.setSubject(mSubjectView.getText().toString());
-        // XXX TODO - not sure why this won't add header
-        // message.setHeader("X-User-Agent", getString(R.string.message_header_mua));
+        message.setHeader("X-User-Agent", getString(R.string.message_header_mua));
+        
+        if (mInReplyTo != null) {
+        	message.setInReplyTo(mInReplyTo);
+        }
+       
+        if (mReferences != null) {
+        	message.setReferences(mReferences);
+        }
+        
 
         /*
          * Build the Body that will contain the text of the message. We'll decide where to
@@ -1085,6 +1096,26 @@ public class MessageCompose extends K9Activity implements OnClickListener, OnFoc
                     addAddresses(mToView, replyToAddresses = message.getFrom());
                 }
                 
+                if (message.getMessageId() != null && message.getMessageId().length() > 0) {
+                	String messageId = message.getMessageId();
+                	mInReplyTo = messageId;
+                	
+                    if (message.getReferences() != null && message.getReferences().length > 0) {
+                    	StringBuffer buffy = new StringBuffer();
+                    	for (int i=0; i < message.getReferences().length; i++) 
+                    		buffy.append(message.getReferences()[i]);
+                    	
+                    	mReferences = buffy.toString() + " " + mInReplyTo;
+                    } 
+                    else {
+                    	mReferences = mInReplyTo;
+                    }
+
+                } 
+                else {
+                	Log.d(Email.LOG_TAG, "could not get Message-ID.");
+                }
+                                             
                 Part part = MimeUtility.findFirstPartByMimeType(mSourceMessage,
                         "text/plain");
                 if (part != null) {

src/com/android/email/mail/Message.java

@@ -66,6 +66,14 @@ public abstract class Message implements Part, Body {
 
     public abstract void setReplyTo(Address[] from) throws MessagingException;
 
+    public abstract String getMessageId() throws MessagingException;
+    
+    public abstract void setInReplyTo(String inReplyTo) throws MessagingException;
+    
+    public abstract String[] getReferences() throws MessagingException;
+    
+    public abstract void setReferences(String references) throws MessagingException;
+    
     public abstract Body getBody() throws MessagingException;
 
     public abstract String getContentType() throws MessagingException;

src/com/android/email/mail/internet/MimeMessage.java

@@ -19,6 +19,9 @@ import org.apache.james.mime4j.MimeStreamParser;
 import org.apache.james.mime4j.field.DateTimeField;
 import org.apache.james.mime4j.field.Field;
 
+import android.util.Log;
+
+import com.android.email.Email;
 import com.android.email.mail.Address;
 import com.android.email.mail.Body;
 import com.android.email.mail.BodyPart;
@@ -37,6 +40,11 @@ public class MimeMessage extends Message {
     protected Address[] mCc;
     protected Address[] mBcc;
     protected Address[] mReplyTo;
+    
+    protected String mMessageId;
+    protected String[] mReferences;
+    protected String[] mInReplyTo;
+    
     protected Date mSentDate;
     protected SimpleDateFormat mDateFormat;
    
@@ -56,6 +64,7 @@ public class MimeMessage extends Message {
         sb.append(".");
         sb.append(Long.toString(System.currentTimeMillis()));
         sb.append("@email.android.com>");
+        
         return sb.toString();
     }
 
@@ -77,6 +86,11 @@ public class MimeMessage extends Message {
         mCc = null;
         mBcc = null;
         mReplyTo = null;
+        
+        mMessageId = null;
+        mReferences = null;
+        mInReplyTo = null;
+        
         mSentDate = null;
         
         mBody = null;
@@ -259,6 +273,28 @@ public class MimeMessage extends Message {
         }
     }
 
+    public String getMessageId() throws MessagingException {
+    	if (mMessageId == null) {
+    		mMessageId = getFirstHeader("Message-ID");
+    	}
+    	return mMessageId; 
+    }
+    
+    public void setInReplyTo(String inReplyTo) throws MessagingException {
+    	setHeader("In-Reply-To", inReplyTo);
+    }
+    
+    public String[] getReferences() throws MessagingException {
+    	if (mReferences == null) {
+    		mReferences = getHeader("References");
+    	}
+    	return mReferences;
+    }
+    
+    public void setReferences(String references) throws MessagingException {
+    	setHeader("References", references);
+    }
+    
     public void saveChanges() throws MessagingException {
         throw new MessagingException("saveChanges not yet implemented");
     }

src/com/android/email/mail/store/LocalStore.java

@@ -80,6 +80,9 @@ public class LocalStore extends Store implements Serializable {
     static
     {
         HEADERS_TO_SAVE.add(Email.K9MAIL_IDENTITY);
+        HEADERS_TO_SAVE.add("In-Reply-To");
+        HEADERS_TO_SAVE.add("References");
+        HEADERS_TO_SAVE.add("X-User-Agent");        
     }
 
     /**