45. Use of the Android event bus distribution Library

Event Bus Distribution Library introduction and comparison of Eventbus and Otto

What is event Bus management:

A. Placing events in a queue for management and distribution
B. Ensure efficient communication and data and event distribution between the various parts of the application
C. Decoupling between modules

The event bus is a publish/subscribe events Fieldbus. Event Bus Mode-also known as message bus or publisher/Subscriber (Publisher/subscriber)
Mode-allows two of components to communicate with each other, but they do not know each other.
Based on the event bus management/subscription/distribution mode. The event response has more thread choices, and Eventbus can publish events to different threads.
Eventbus supports Sticky Event.
You need to register a subscription and then distribute the message data to subscribers. Contains 4 Ingredients: Publisher, subscriber, event, bus. Subscribers can subscribe to multiple events,
The sender can post any event, and the publisher can also be a subscriber. Sub-subscription, registration, release, cancellation and other steps.

Basic usage of Event bus

Subscribe, register, publish, and unregister.
Registered:
Eventbus.getdefault (). Register (this);
Eventbus.getdefault (). Register (new MyClass ());
Registration: Three parameters are, message subscribers (recipients), receive method name, event class
Eventbus.getdefault (). Register (This, "Settexta", Settextaevent.class);

Cancel Registration:
Eventbus.getdefault (). Unregister (this);
Eventbus.getdefault (). Unregister (new MyClass ());

Subscription processing data:
public void oneventmainthread{}
public void OnEvent (Anyeventtype event) {}
Oneventpostthread, Oneventbackgroundthread, Oneventasync

Release:
Eventbus.getdefault (). Poststicky (New Secondactivityevent ("Message from Secondactivity"));
Eventbus.getdefault (). Post (new Changeimgevent (1));

Eventbus Practical Project Application case

Achieve the effect: One click to send data, another place or multiple registration points can be timely access to update the data transmitted over.

knowledge points are involved: event class customization, registration, subscription events, event Publishing, data parsing, and unregister.

<LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "vertical" >    <ButtonAndroid:id= "@+id/btn_send"Android:layout_width= "Fill_parent"Android:layout_height= "Wrap_content"Android:text= "Send Event" />    <TextViewAndroid:id= "@+id/tv_content"Android:layout_width= "Fill_parent"Android:layout_height= "Wrap_content"Android:layout_margintop= "20DP"android:gravity= "Center"android:textsize= "20SP" /></LinearLayout>

/*** Eventbus Demonstration of actual project case*/ Public classMainactivityextendsActivity {PrivateTextView tv_content; PrivateButton Btn_send; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); Tv_content= (TextView) This. Findviewbyid (r.id.tv_content); Btn_send= (Button) This. Findviewbyid (R.id.btn_send); Btn_send.setonclicklistener (NewOnclicklistener () {@Override//Sending data Events             Public voidOnClick (View arg0) {myevent my=NewMyEvent (); My.settype ("1"); My.setcontent ("1 Content");            Eventbus.getdefault (). post (my);        }        }); Eventbus.getdefault (). Register ( This); }     Public voidonEvent (MyEvent event) {if(Event.gettype (). Equals ("0") {tv_content.settext (event.getcontent ()); }    }     Public voidOneventmainthread (MyEvent event) {if(Event.gettype (). Equals ("1") {tv_content.settext (event.getcontent ()); }} @Overrideprotected voidOnDestroy () {Super. OnDestroy (); Eventbus.getdefault (). Unregister ( This); }}

 Public classMyEvent {PrivateString type; PrivateString content;  PublicString GetType () {returntype; }     Public voidsetType (String type) { This. Type =type; }     PublicString getcontent () {returncontent; }     Public voidsetcontent (String content) { This. Content =content; }}

45. Use of the Android event bus distribution Library