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wiki you can find more about the API, about how to use mqtt.
3) send messages
For example programs that use PHP to send messages, see:Phpmqttclient.
With the sample code given above, you can build an environment for testing.
The above is a brief summary of the above article.
In the preceding steps, you need to use PHP and set up a webserver to send messages.However, what should we do if we do not set up
the logic of UI access more complex22) lock mechanism reduces the efficiency of UI access because the lock mechanism blocks execution of certain threadsNO6:1) Consider using ThreadLocalWhen some data is scoped to a thread and different threads have different copies of the data. such as Looper, Activitythread, and AMs.2) threadlocal Another usage scenario is the transfer of objects under complex logic, such as listeners. Because parameter passing can make programming worse, static variables do n
Android message mechanism
A lot of previous knowledge is always forgotten. It seems that I have not fully understood it, and I hope to record it in the form of a blog.
Speaking of the android message mechanism, we have to mentionHandlerIts Chinese meaning is the controller and processor.The Handler documentation on
? Google's internal comments are truly reliable.
1) The user defines the message identifier so that the system can identify what the current message is about. Each Handle has its own namespace for its own message identifier. Therefore, we do not have to worry about conflicts between Handler.
2) The second parameter has the same meaning as the third parameter, whi
(), platform.android (), Platform.winphone ().Setaudience: Sets the message acceptance group. There are three main audiences, Audience.all () represents all users, Audience.alias (alias) represents the user who specified the alias, and Audience.tag (tag) represents the user who specified the tag.Setnotification: Sets the notification content. According to different platform there are three kinds of setup methods, respectively: Notification.ios, Notif
mechanism.Therefore, the asynchronous processing mechanism of handler in Android can provide users with a more reasonable and user-friendly experience. Of course, Android is used handler to achieve, other platform environment, also has its own set of asynchronous implementation mechanism, the same principle, the name is different.Now that we're doing
which then reference * This looper, before actually the loop. Being sure to call
* {@link #loop ()} After calling this method, and end it by calling * {@link #quit ()}. * *///To set up this Looper object in TLS, if this thread has already set looper, it will make an error//This means that a thread can only set one looper public static final void prepare () {
Before also because weekend night watching TI3 competition, has not found the time to write a blog, resulting in a long period of not updated. Ashamed! Back to the progress of the next, try to make sure to write every week. Here is also the first to congratulate the Alliance team from Sweden won the TI3 champion, I hope next year China team can tiger up!Getting started, we all know that the Android UI is thread insecure, and if you try to do UI action
In Android, messages are often used for information interaction within threads or between threads, and if we are familiar with its internal principles, it will make it easier and better to structure the system and avoid some low-level errors.
Each android application creates a thread that is called the primary or UI thread when it starts, and all of the actions that An
at sendmessagedelayed (message msg, long Delaymillis)public Final boolean sendmessagedelayed (Message msg, long Delaymillis) {if (Delaymillis Look at the code above. You can see the target that handler set itself as a message, and then put the MSG in the queue. and specify the run time.Message processingProcesses the
What is the Android Message Pool?-source code analysis, androidpool
In Android, the Android Message mechanism is usually used for communication between threads, and this mechanism is used for Message transmission.
Generally, we u
The android asynchronous message processing thread, which has been in an infinite loop each time it reads a message from the message queue, then calls back the method of processing messages in the handler handlermessage. If the message queue is empty, the thread hangs, waits
. RAW_CONTACT_ID, mRawContactID); // set MIMETYPE mValues. put (Data. MIMETYPE, StructuredName. CONTENT_ITEM_TYPE); // set the contact name mValues. put (StructuredName. DISPLAY_NAME, Name); // Insert the Contact Name Information mContext. getContentResolver (). insert (Data. CONTENT_URI, mValues); mValues. clear (); // set RawContactID mValues. put (Phone. RAW_C
Reprint please indicate source: http://blog.csdn.net/lmj623565791/article/details/38476887, this article from "Zhang Hongyang's Blog"A group has been created recently. Easy to communicate, Group No.:55032675The previous blog describes the android asynchronous message processing mechanism. Assuming you don't understand, you can see: the Android Asynchronous
protocol component and an external interface component. The XMPP protocol component is responsible for connection management, message communication between the server and the Android client, and the external interface component is responsible for receiving commands from the application system, the client application, and sending the received notification message
Windows programmers may know that Windows programs are message-driven and have a global message loop system. Android applications are message-driven, and the message loop mechanism should also be provided. Android uses logoff and
simple lifecycle management and numerous savings on thread Life and Death overhead. At the same time, another very important issue involves data synchronization in a single piece. Each class has its own handler class, which does not interfere with each other. distribution can be performed separately. When there are multiple data requests, the same contentresolver may have very few operations, which avoids blocking. All in all, this solution is perfectly compatible with the overall
The text message files read in Android include
[Java]/*** All text messages*/Public static final String SMS_URI_ALL = "content: // sms /";/*** Inbox text message*/Public static final String SMS_URI_INBOX = "content: // sms/inbox ";/*** Send a text message to the sender*/Public static final String SMS_URI_SEND = "conten
Original address:http://blog.csdn.net/xplee0576/article/details/46875555In Android, we usually use Android's messaging mechanism for communication between threads, and this mechanism passes exactly the message.In general, we use message.obtain() and handler.obtainmessage () to get a message from the message pool to avoid constructing the
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