android os handler dispatchmessage

. http. util. entityUtils; 12 13 import android. app. activity; 14 import android. app. progressDialog; 15 import android. graphics. bitmap; 16 import android. graphics. bitmapFactory; 17 import android. OS. bundle; 18 import

Android uses Handler to implement message delivery mechanism (2). androidhandler Before starting this article, let's summarize some key points about Handler, logoff, and MessageQueue in the first two articles: 0) before creating a Handler in the thread, you must first call logoff. prepare (), create a local thread vari

In Android asynchronous processing 1: Using Thread + Handler to update the UI of a non-UI Thread.Overview: Android uses the message mechanism to implement inter-thread communication. A thread establishes its own message loop through logoff. MessageQueue is a FIFO message queue, and logoff is responsible for extracting messages from MessageQueue, and distribute it

the data sent from the Message: // Declare a Handler object and implement the handleMessage () method private Handler handler = new Handler () {public void handleMessage (android. OS. message msg) {if (msg. what = 3) {textview. s

, it creates a new message and sets its mcallback to the runnable object, and inserts the message into messagequeue. 4) handler functions include processing messages (executing message content) and forwarding messages, which are mainly processed by handlemessage and dispatchmessage functions; 5) in handler, both send message and post runnable are added to message

cyclically reads the Message object from the MessageQueue queue, submits the Message object to Handler for processing, and calls the dispatchMessage method of Handler. Now let's take a look at the basic implementation code of Handler: // Create a handler in the main threadN

Now we have a problem first. We use myThreadHandler. sendEmptyMessage (0); To send a message object, how does Handler receive and process the message object? First, I will draw a data structure diagram: From this figure, we can clearly see that after sendEmptyMessage is called, the Message object will be put into a MessageQueue queue, which belongs to a logoff object, and each logoff object passes through ThreadLocal. set (new logoff () is bound to

Android asynchronous Message processing mechanism allows you to deeply understand the relationships among logoff, Handler, and Message, and androidlogoff Reprinted please indicate the source: http://blog.csdn.net/lmj623565791/article/details/38377229, this article from [Zhang Hongyang's blog] Many people have been asked about the interview. What is the relationship between logoff,

(me.mlogging!= null) me.mLogging.println (" Check again at\sdk\sources\android-16\android\os\handler.java in thedispatchmessage function, execute runnable or callhandlemessage for processing. Process message, the method is called by Looper public void DispatchMessage (Message msg) { if (

code first. Private Handler mHandler = new Handler () {// parameter: Message is equivalent to a carrier of information and can transmit data from sub-threads to the main thread, that is, the so-called inter-thread communication... Public void handleMessage (android. OS. Message msg) {// This method is executed in the

Android multi-thread Analysis 3: Handler, logoff implementation, androidlogoff Android multi-thread Analysis 3: Implementation of Handler and logoffLuo chaohui (http://www.cnblogs.com/kesalin/) CC license, reprinted please indicate the source In the previous article "Android

When Android uses Handler for instantiation (new), such as: private Handler Handler = new Handler (); Will complain "Handler is abstract, cannot to be instantiated.", prompt use, other instantiation way. Cause: An error occurred

submits it to handleMessage of Handler for processing. After the processing is complete, call Message. recycle () to put it into the Message Pool. 4. Handler: the Message processor. handler encapsulates the information to be transmitted into a Message, which is implemented by calling the obtainMessage () of the handler