looper vst

:(Handler, Looper, Message, MessageQueue)Message: Messages that contain the message ID, the message Processing object, and the processed data are queued by MessageQueue and processed by handler.Handler: Handler, responsible for sending and processing the message. When using handler, you need to implement the Handlemessage (Message msg) method to process a specific message, such as updating the UI. The main functions of the handler class are: (There ar

In accordance with the principles of Android handler detailed analysis we can know that when creating handle objects in the main thread, the main thread creates a loop object by default using the Threalocal function to bind the loop object and the main thread.Can we create a loop object and child thread bindings in a child thread that's actually possible?In this way we create a Looper object in the child thread, bind the

provide a separate copy of the variable, So each thread can change its own copy independently, without affecting the counterpart of other threads. In fact, this is in the space of time (contrary to synchronized), at the expense of memory, the single greatly reduce the thread synchronization (such as synchronized) the performance of the cost and reduce the complexity of the thread concurrency control. The typical example is the use of threadlocal in the Android code for

) the performance of the cost and reduce the complexity of the thread concurrency control. The typical example is the use of threadlocal in the Android code for Looper and the basic usage of threadlocal, as follows: public class Looper { private static final String TAG = "Looper"; Sthreadlocal.get () would return null unless for you ' ve called prepare ().

[Java]View Plaincopyprint? Public void showtoast (String msg) { Looper.prepare (); Toast.maketext (Getapplicationcontext (), MSG, Toast.length_short). Show (); Looper.loop (); } public void Showtoast (String msg) {looper.prepare (); Toast.maketext (Getapplicationcontext (), MSG, Toast.length_short). Show (); Looper.loop ();}Just add those two sentences to show toast in a non-UI thread[Java]View Plaincopyprint? The show () inside the toast publ

One of the reasons I love Android APIs are because it contains so many useful little things. Many of them is not even specific to the platform and I really miss them in Java SE. Today I ' d like to give a short introduction to II nice classes– Looper and Handler. They is used in the Android UI internally, and available to US developers so we can do some cool things with their help.So what can I do with Loopers and Handlers? Basically, they implement a

also be done.2.Handler cross-thread communication 2.1 principle descriptionIn order for other threads to send messages to notify the current thread to perform some tasks, the current thread thread can do this: The current thread provides a unique MessageQueue that is used to receive a message that other threads have dropped in. MessageQueue maintains all messages using FIFO time sequence. The current thread provides a unique looper to ma

); }//handler The default constructor will eventually be transferred to this method Public Handler(Callback Callback, BooleanAsync) {if(Find_potential_leaks) {final classif((Klass.isanonymousclass () | | klass.ismemberclass () | | klass.islocalclass ()) (klass.getmodif Iers () modifier.static) = =0) {//It turns out there has been a test printLOG.W (TAG,"The following Handler class should be static or leaks might occur:"+ Klass.getcanonicalname ()); } }there is a mlooper in//handlerM

processing is performed after the service die, please move to the next step to check and analyze private Boolean mredelivery; // In fact, this stuff runs in handlerthread. Why? This is nonsense. We use the logoff private final class servicehandler extends handler of handlerthread {// This part must be passed into the Logoff of handlerthread, right? Right? It must be public servicehandler (Looper loler) {super (Lo