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Use Android Handler asynchronous message processing mechanism to create a powerful image loading class
Recently, a group was created to facilitate communication. Group Number:55032675
The previous blog introduced the Android asynchronous Message processing mechanism. If you do not know about it, you can see:
internal class, it is basically meaningless ...) the message is analyzed and forwarded to the corresponding onxxxcomplete method.
7. The onxxxcomplete method rewritten by the user starts to work.
This is what it has done secretly. It is basically easy to understand. The only thing I'm curious about is its thread management method. I guess it is a single-piece mode.The instantiation of the first asyncqueryhandler will lead to the creation of a thr
Android-text message backup and Restoration
Currently, some Android mobile phone software can back up and restore mobile phone text messages. This blog post will introduce how to back up and restore Android text messages. Well, I believe you are still interested in these practical functions. Let's go to the topic.I.
; default: Break ;}}// receives data and processes the private thread deleethread = new thread () {public void run () {logoff. prepare (); // The logoff object of the current thread handler1 = new threadhandler (logoff. mylogoff (); logoff. loop ();}};
When two threads transmit data, you can use either of the following methods:
① Set the global variable response of the Request Response. After the connectthread requests data, it uses handler2.send
IntroductionWhen we do Android development, we often need to implement the asynchronous loading of images/Web pages/other. In fact, to implement asynchronous loading, you need to implement inter-thread communication, while in Android, using Handler, Looper, and Message enables different threads to communicate and complete asynchronous tasks. Although
Why Android has to provide handlerAndroid recommends that we do not take time-consuming actions in the UI thread because it can easily lead to a ANR exception (in the Android source code we see that the UI will report a ANR exception if the user's operation is not responding for more than 5 seconds). Therefore, some time-consuming operations are done in the child threads. When we get the data in a child thr
Queue.enqueuemessage (msg, uptimemillis); }This method mainly does two things:1) Set Msg.target as the current handler object2) Call the Enqueuemessage method of MessageQueueSo, in fact, this is where you put the message object in the messages queue.Speaking of MessageQueue, we must first understand that this message queue is actually a list of the structure,
Android Handler logoff and MessageQueue message mechanism Principle
Android message processing class:
Logoff, Handler, MessageQueue, Message, ThreadLocal, ThreadLocal. Values, and HandlerThread.Logoff: the thread does not have a message
, the progress bar goes 5. If the acsag stops, the progress bar returns to zero.
Android XML:
Style = "? Android: ATTR/progressbarstylehorizontal"Android: layout_width = "fill_parent"Android: layout_height = "wrap_content"/>
Example 1: When the thread is enabled, message
Although the preface has been doing application layer development, but our group is the core system BSP, it is necessary to understand the underlying understanding of Android's operating mechanism. As far as applications are concerned, Java applications on Android are the same on other systems, and they work by message-driven, and they work roughly as follows: 1. There is a
=msg; Msg=Msg.next; } while(msg! =NULL!msg.isasynchronous ()); } if(msg! =NULL) { if(Now msg.when) {//Next message is isn't ready. Set a timeout to wake up when it was ready.Nextpolltimeoutmillis = (int) Math.min (Msg.when-Now , Integer.max_value); } Else { //Got a message.mblocked =false; if(Prevmsg! =NULL) {Prevmsg.next=Msg.next; } Else{mmessages=M
This article focuses on the components that Android often uses for message hinting: Alertdialog, TOAST, notification usage scenarios, and their basic usage, explore some advanced topics, and finally summarize some of the common problems in the development process.
Let's start with a visual understanding of these three message-hinting mechanisms, namely Alert
customized version for Android apps, and if you want to make changes to the server, move more places.The OpenFire is a more extensive, open source real-time collaboration server based on the XMPP protocol, which can be used to simply build an IM platform. ANDROIDPN was simplified on the openfire and only pushed for Android messages. It can also be seen from here that the XMPP protocol is a bit overkill for
In the Android messaging mechanism. It not only provides a message loop for Java used by application development. In fact, the Java mechanism finally depends on native to achieve. The native not only provides a set of messaging and processing mechanisms, but also provides a listening mechanism that defines the I/O time of the file description descriptor. Let's an
Working principle of ThreadLocal in Android message mechanism, androidthreadlocal
We should be familiar with the messaging mechanism, which is inevitably involved in daily development. From the perspective of development, Handler is the upper-layer interface of the Android message mechanism, so that you only need to in
-UI threads, immediately wake up crash feedback interface prompts the user to send an error message to email.
The effect chart is as follows:
process, you need to know a few points of knowledge as follows:
1. Intercept Uncaughtexception
Application.oncreate () is the entry method for the entire Android application. You can intercept uncaughtexception by executing the following code in this method:
This article is very good, simple, the key is a junior students to analyze their own experience. This is the reason why I like this article. Please see the text below:
As a junior preparatory programmer, I learn the fun of Android is to learn from the source code Google Daniel's design ideas. The Android SDK has a lot of design patterns in it, and in addition to that, it has designed a variety of helper cl
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