我正在尝试用 firebase、sqlite 和 sqlBrite 构建一个聊天存储系统。这样做的目的是在不必重建页面的情况下流式传输新消息。来自 sqlBrite 的流仅在 setstate 上重建，例如当键盘被拉回时。
如何让流在保存时自动更新。
数据库文件
///INSERT INTO DB
Future<int> insertNewMessage(String id, int result, BriteDatabase briteDb,
Map<String, dynamic> row) async {
messageList.add(id);
await ifexists(id, messageId, briteDb)
? print('message already In')
: result = await briteDb.insert(messageTable, row);
return result;
}
////STREAM MESSAGES
Stream<List<Map<String, dynamic>>> getMessageMapListbyId(
{String sendId, String receiveId, database}) async* {
try {
BriteDatabase briteDb = await database;
yield* briteDb.createQuery(messageTable,
distinct: false,
where:
' $senderId=? $receiverId = ? ',
whereArgs: [
sendId,
receiverId,
])});
提供者文件
///ADD MESSAGES
addMessageTodb(message) async {
await ldbH
.msg_insertMessage(
message.id, modelFuncs.messageMaping(message, msgFuncs))
.then((value) async {
await getMessageYieldBase(message.senderId, message.receiverId);
});}
///STREAM NEW DATA
getMessageYieldBase(senderId, receiverId) async* {
yield* ldbH.msg_getAllMessagesbyId(senderId, receiverId);}
ui端
StreamBuilder(
stream: messageStream.getMessageYieldBase(
widget._currentUserId, widget.receiver.uid),
builder: (context, AsyncSnapshot<dynamic> snapshot) {
var d = snapshot.data;
var newList = snapshot.hasData ? d.reversed.toList() : [];
return
ListView.builder(
reverse: true,
padding: EdgeInsets.all(10),
controller: widget._listScrollController,
itemCount: newList.length,
itemBuilder: (BuildContext context, int index) {
return DisplayMessage(
currentUserId: widget._currentUserId,
receiver: widget.receiver,
message: newList[index],
);
});
})
因此，只有当页面以某种方式重建时，新文本才会不断出现。感谢您提供的任何帮助。