(转)[Android实例] 关于使用ContentObserver监听不到删除短信会话的解决方案

最近做通讯录的项目，需要实时监听短信的删除，就用到了观察者ContentObserver，怪异的事情就此发生，当我删除一条短信的时候，可以监听到，但是，当我删除整条短信的时候，就无法监听到，查了很多资料，都没有一个好的解决方案，顺便吐糟一下：大家来eoe发问题，问题解决了，也不说把解决的方法给大家分享一下。。。

OK，先看源码吧
com.android.providers.telephony.MmsSmsProvider这个类的删除操作源码

@Override
public int delete(Uri uri, String selection,
         String[] selectionArgs) {
      SQLiteDatabase db = mOpenHelper.getWritableDatabase();
      Context context = getContext();
      int affectedRows = 0;

      switch(URI_MATCHER.match(uri)) {
         case URI_CONVERSATIONS_MESSAGES:
            long threadId;
            try {
                  threadId = Long.parseLong(uri.getLastPathSegment());
            } catch (NumberFormatException e) {
                  Log.e(LOG_TAG, "Thread ID must be a long.");
                  break;
            }
            affectedRows = deleteConversation(uri, selection, selectionArgs);
            MmsSmsDatabaseHelper.updateThread(db, threadId);
            break;
         case URI_CONVERSATIONS:
            affectedRows = MmsProvider.deleteMessages(context, db,
                                    selection, selectionArgs, uri)
                     + db.delete("sms", selection, selectionArgs);
            // Intentionally don't pass the selection variable to updateAllThreads.
            // When we pass in "locked=0" there, the thread will get excluded from
            // the selection and not get updated.
            MmsSmsDatabaseHelper.updateAllThreads(db, null, null);
            break;
         case URI_OBSOLETE_THREADS:
            affectedRows = db.delete("threads",
                     "_id NOT IN (SELECT DISTINCT thread_id FROM sms " +
                     "UNION SELECT DISTINCT thread_id FROM pdu)", null);
            break;
         default:
            throw new UnsupportedOperationException(NO_DELETES_INSERTS_OR_UPDATES);
      }

     if (affectedRows > 0) {
         context.getContentResolver().notifyChange(MmsSms.CONTENT_URI, null);
      }
      return affectedRows;
}

注意红字部分，当删除整条会话的时候，系统发的通知是MmsSms.CONTENT_URI,查证：MmsSms.CONTENT_URI=Uri.parse("content://mms-sms")

OK~问题就此解决

我可以说我找的蛋都碎了吗，我可以说大家能不能有点互帮互助的精神，拜托，大家都是敲代码的。。。

http://www.eoeandroid.com/thread-325408-1-1.html

http://www.eoeandroid.com/thread-325255-1-1.html