android - 恢复备份消息，对话时间不正确

Question

我正在开发一个 Android 应用程序，用于备份和恢复来自设备的消息/对话。它备份消息，以 xml 的形式导出文件，然后再恢复它。我面临的唯一问题是对话的日期/时间。它在恢复时更改为当前时间，但是当我打开任何对话时，时间是正确的。看看照片。

备份前:

备份后:

我用于备份的代码:

Uri uri = Uri.parse("content://sms/inbox");
        //Uri uri = Uri.parse("content://mms-sms/conversations/");
        ContentResolver contentResolver = getContentResolver();

        final String[] projection = new String[]{"*"};

        Cursor SMSL = contentResolver.query(Telephony.Sms.Inbox.CONTENT_URI, projection, null, null, null);
        int msgscount = SMSL.getCount();
        if (msgscount>0) {
            msgs = new String[SMSL.getCount()][5];
            int i = 0;
            while (SMSL.moveToNext()) {
                address = SMSL.getString(SMSL.getColumnIndex("address"));
                body = SMSL.getString(SMSL.getColumnIndex("body"));
                read = SMSL.getString(SMSL.getColumnIndex("read"));
                date = SMSL.getString(SMSL.getColumnIndex("date"));
                type = SMSL.getString(SMSL.getColumnIndex("type"));

                msgs[i][0] = address;
                msgs[i][1] = body;
                msgs[i][2] = date;
                msgs[i][3] = read;
                msgs[i][4] = type;

                Log.i("Date: ", String.valueOf(SMSL.getLong(SMSL.getColumnIndex("date"))));

                i++;
            }
            SMSL.close();
        }else{
            msgs = new String[0][0];
            Toast.makeText(getApplicationContext(),"No messages found!",Toast.LENGTH_LONG).show();
        }

恢复代码:

                    ContentResolver contentResolver = getContentResolver();
                    Uri uri = Uri.parse("content://sms/inbox");
                    //Uri uri = Uri.parse("content://mms-sms/conversations/");

                    ContentValues values = new ContentValues();
                    for (int i = 0; i < readMsgsFromFile.length; i++) {
                        values.put("address",readMsgsFromFile[i][0]);
                        values.put("body",readMsgsFromFile[i][1]);
                        values.put("date",readMsgsFromFile[i][2]);
                        values.put("read",readMsgsFromFile[i][3]);
                        values.put("type",readMsgsFromFile[i][4]);

                        contentResolver.insert(Telephony.Sms.Inbox.CONTENT_URI, values);
                        Log.i("Restoring: ",readMsgsFromFile[i][2]);
                    }

Answer 1

谢谢 Mike M。我确实找到了解决方案，你是对的，只要用户收到或发送新消息，对话表就会更新，并且对话时间与该消息(无论是接收还是发送)的时间相同.但是在通过 contentresolver 查询写入消息的情况下，它不起作用并且对话时间是写入时的当前时间。所以我所做的是在消息恢复后立即在所有对话中添加一条临时消息。然后删除所有临时消息，这会将对话时间更新为上次消息时间。

            HashSet hs = new HashSet();

            hs.addAll(list); 
//list is the ArrayList<String> which contains the addressess of all the messages and 
//through hashset we remove all the duplicates to get only the addressess once and hence we know the number of conversations and their addressess.

            list.clear();
            list.addAll(hs);
             //Add some dummy message to each conversation
            ContentValues values2 = new ContentValues();
            for (int i = 0; i < list.size(); i++) {
                values2.put("address",list.get(i));
                values2.put("date_sent",readMsgsFromFile[0][1]);
                values2.put("date",readMsgsFromFile[0][2]);
                values2.put("type",readMsgsFromFile[0][3]);
                values2.put("body","temp"); //this should be more unique
                values2.put("read",readMsgsFromFile[0][5]);
                values2.put("service_center","01010101");

                contentResolver.insert(Telephony.Sms.CONTENT_URI, values2);
            }

//Now deleting that message with body 'temp' from each conversation
            Cursor c = contentResolver.query(Telephony.Sms.CONTENT_URI,null,null,null,null);
            while (c.moveToNext()){
                String body = c.getString(c.getColumnIndex("body"));
                String mid = c.getString(0);
                if (body.equals("temp")){
                    Log.i("Deleting ",mid);
                    getContentResolver().delete(Uri.parse(Telephony.Sms.CONTENT_URI+"/"+mid),null,null);
                }
            }
            c.close();

“temp”这个词可以而且应该更独特，这样它就不会与实际消息混在一起。