wechat | 微信快速开发框架 | Chat library

I believe the problem is here:

Your socialMediaSites is an array of SocialMediaSites, not strings. You'll need to create a new SocialMediaSite first.

latest_date = db.Column(db.DateTime) -> because its datetime not date?

First increase the connection timeout, you currently have it set to 4 seconds, the default is 30 seconds. Because test.mosquitto.org is a totally public broker it often gets hammered by people (either testing stuff or just not thinking what they are doing) so a longer timeout is better.

Secondly, having a clientID of test_client is VERY likely to clash with another client so your client will get kicked off the broker as soon as the other client tries to reconnect which will cause your client to reconnect causing a connect/disconnect loop. ClientID's need to unique across ALL clients connecting to the broker, I suggest you change this to a unique to you prefix combined with a random number.

Thirdly you don't actually do anything even if you connect, you make no subscriptions, so the on message event handler will never be called. You don't even have a on connect event handler to know if you ever get connected cleanly.

e.g.

To set your master Sound volume try

Use the method of "getCurrentPages()" when you need. When the page stack change, the return data of method will not change.You must use it again to get the lastest data.

Otherwise, you can use the parameter of "debug" in "app.json". With opening it, when the page stack change you can see it in the console tool.

You are on the right track with GestureDetector. If you want to open to a new screen, you can use Navigator.of(context).push to push a new MaterialPageRoute. And since you are in a GridView builder function, you can use menuList[position] to get the current item. For example:

1. The first set of functions are called action creators. They take any data, and create an action that packages that data with the action type. For LoginRequested() the payload is username and password. Not all actions need to have a payload however and so for Logout() you may be able to exclude any paramaters from that action creator.
2. Reducer's take actions produced by action creators (such as LoginRequested and logout), and calculate an update to the store's state. From the code sample you have provided isLoading and authen are two boolean properties that are being read from some actions, and stored in the redux store via these reducers. To understand where these values originate, you'll need to debug where actions with these types are created: 'LOG_IN_REQUEST'
3. You are correct that actions have a type property that is any random identifier. It's common practice to use a phrase-like string data type to make it more readable.
4. loginHandler is being passed as the function that takes the onSubmit. The onSubmit of any HTML based form will pass a set of key-value pairs in an object, and thus loginHandler must take it's arguments in the format {}
5. You are correct, it is because of onSubmit. This function will take the name of every HTML input element within it's HTML node, and pair it with the respective element's value.

You can use R.omit: