Android Handle detailed 3 Threadhandler

On the basis of Android handle detailed 2, we come to learn Threadhandler

The essence of Threadhandler is the implementation of the Android handle detailed 2

Handlerthread is actually a thread, and the thread internally creates a Looper object, which is a looper unique to the child thread, used to take out and handle the message.

Let's take a look at the use of Handlerthread

Privatenew handlerthread ("Handlerthread"); Handlerthread.start ();

Create the handler, using Mhandlerthread.getlooper () to get the Looper object created internally Handlerthread: We'll get the Looper object passed to the handler object through the constructor, This allows the handle object to get the message Queue member variable of the Looper object, which is a member variable of the Looper object

Final New Handler (Mhandlerthread.getlooper ()) {            @Override            publicvoid  handlemessage ( Message msg) {                System.out.println ("received message");            }        };

Then create a new sub thread to send the message:

New Thread (new  Runnable () {            @Override            publicvoid  run () {                  Try  {                    thread.sleep (+);   Analog time-consuming operation                    handler.sendemptymessage (0);                 Catch (interruptedexception e) {                    e.printstacktrace ();}}}        ). Start ();

Finally, be sure not to forget to release in OnDestroy to avoid memory leaks:

@Override     protected void OnDestroy () {        super. OnDestroy ();        Mhandlerthread.quit ();    }

is not quite the classics must make Handleer's internal realization principle very clear

Android Handle detailed 3 Threadhandler