[Android] Message: Monitor MMS

1. Monitor incoming mms event
   class MMSHandler extends Handler
   {
       public void handleMessage(Message msg)
       {
           //Handle message
       }
   }
   
   class MMSObserver extends ContentObserver
   {
       private Handler m_handler = null;
   
       public MMSObserver (Handler handler)
       {
           super(handler);
           m_handler = handler;
       }
   
       public void onChange(boolean bSelfChange)
       {
           super.onChange(bSelfChange);
   
           //Send message to Activity
           Message msg = m_handler.obtainMessage;
           msg.obj = "xxxxxxxxxx";
           msg.sendToTarget();
   
           Uri uriMMSURI = Uri.parse("content://mms");
           Cursor cur = this.getContentResolver().query(uriMMSURI , null, null,
                        null, null);
           while(cur.moveToNext())
           {
                   String subject = cur.getString(cur.getColumnIndex("sub"));
                   String addr; //Get mms' address
                   if (subject == null && addr == null)
                   {
                        continue; //Ignore the mms since it is auto saved into draft temporarily
                   }
    
                  Calculate the mms's signature;
                  Search the signature in Cache
                  If the signature is found, call "continue"
                  Else this is new mms.
           }
       }
   }
   
   //First, cache all messages' signature (can contain addr, id, transaction id (colume name is tr_id), and hash code of subject + body) in to hash table
   ContentResolver contentResolver = getContentResolver();
   Handler handler = new MMsHandler();
   ContentObserver m_MMSObserver = new MMSObserver(handler);
   contentResolver.registerContentObserver(Uri.parse("content://mms-sms/"),
   true, m_MMSObserver);  //Register to observe MMS)
   //Release cache
   
2. Parse MMS
   The mms/sms are stored in SQLite file
   /data/data/com.android.providers.telephony/databases/mmssms.db
   /data/data/com.android.providers.telephony/app_parts/*
   mmssms.db srotes the sms and mms information, and the files under app_parts stores the files attached in MMS.
   Other application has no permission to access that database file, we only can read mms/sms throung content provider.
   
   Sample code:
   Cursor curPdu = getContentResolver().query(Uri.parse("content://mms"), null, null, null, null);
   int id = curPdu.getInt(curPdu.getColumnIndex("_id"));
   int thread_id = curPdu.getInt(curPdu.getColumnIndex("thread_id"));
   String subject = curPdu.getString(curPdu.getColumnIndex("sub");
   int date = curPdu.getInt(curPdu.getColumnIndex("date"));
   
   //Delete mms, need not delete its attachments explicitly, since they will be deleted automatically
   getContentResolver().delete(Uri.parse("content://mms/" + Integer.toString(id)));
   
   String selectionAddr = new String("msg_id='" + Integer.toString(id) + "'");
   Uri uriAddr = Uri.parse("content://mms/" + curPdu.getString(curPdu.getColumnIndex("_id")) + "/addr"); //use provider 'content://mms/#/addr' to get address
   Cursor curAddr = getContentResolver().query(Uri.parse(uriAddr, null, selectionAddr, null, null);
   String contact_id = curAddr.getString(curAddr.getColumnIndex("contact_id"));
   String address = curAddr.getString(curAddr.getColumnIndex("address"));
   
   String selectionPart = new String("mid='" + Integer.toString(id) + "'");
   Cursor curPart = getContentResolver().query(Uri.parse("content://mms/part"), null, selectionPart, null, null);
   /*
   //You can also use following code
   Cursor curPart = getContentResolver().query(Uri.parse("content://mms/" + Integer.toString(id) + "/part"), null,null , null, null);
   */
   while(curPart.moveToNext())
   {
       String type = curPart.getString(curPart.getColumnIndex("ct"));  //content type
       String attachmentpath = curPart.getString(curPart.getColumnIndex("_data"));
       String cid = curPart.getString(curPart.getColumnIndex("cid"));
   
       if (cid.euqals("")  //Current row stores MMS body
       {
           String body = curPart.getString(curPart.getColumnIndex("text"));
       }
       else if (!attachmentpath.euqals(null))  //Current row stores MMS  attachment, following code is used to read the attachment file
       {
           int _partID = curPart.getInt(curPart.getColumnIndex("_id"));
           String partID = String.valueOf(_partID);
           Uri partURI = Uri.parse("content://mms/part/" + partID);
                      
           ByteArrayOutputStream baos = new ByteArrayOutputStream();  //This is attachment
           InputStream is = null;
   
           try
           {
               is = getContentResolver().openInputStream(partURI);
               byte[] buffer = new byte[256];
               int len = is.read(buffer);
               while (len >= 0)
               {
                   baos.write(buffer, 0, len);
                   len = is.read(buffer);
               }
           }
           catch (IOException e)
           {
           }
           finally
           {
               if (is != null)
               {
                   try
                   {
                       is.close();
                   } catch (IOException e) {}
               }
           }
       }
   }
   
   if (curPart.moveToFirst())
   do
   {
      
   }
   
   Declare permission
   
   
3. Others
1. About what tables are created in mmssms.db
1. adb pull /data/data/com.google.providers.telephony/databases/mmssms.db .
2. strings mmssms.db  > tmp.txt
3. vi tmp.txt, and search 'CREATE TABLE'
2. All avaliable native providers on Android
   
   
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Referenct:
http://www.blogjava.net/easywu/archive/2010/02/19/313417.html