HandlerLearing

This is a project generated by AS, so there are two dir in the project:

App and handlerdemo where App is empty that can be ignore;

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Introduction

If you wonder why looper does not interrupt the app, this demo may enlight you It is just a demo to show how the handler can update ui when get a message from another thread;

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Directories

Flow

MultiThreadDemo is the entry

Two comparision to show the key of the Handler;

###One comparision:

In another thread, handler's multiThreadTest is invoked. The result is obvious;

public static void compareInAnotherThread(final Handler handler){
        new Thread(new Runnable(){

            @Override
            public void run() {
                handler.multiThreadTest();
                System.out.println("compareInAnotherThread:"+Thread.currentThread().getName());
            }
        }).start();
    }

###The other comparision:

A while without interruption is used to get the message from messagequeue; It is what we called looper;

public static void compareWithLooperThread(final Handler handler){
        final MessageQueue q = new MessageQueue();
        new Thread(new Runnable(){

            @Override
            public void run() {
                q.enqueueMessage(new Message(0));
                System.out.println("compareLooperThread:"+Thread.currentThread().getName());
            }
        }).start();
        while (true){
            handler.sendMessage(q.next());
        }
    }