Android Roboguice Use Guide (19) Send Receive events

Roboguice provides send and receive for events related to the context lifecycle, and events supported by the system defaults are:

Onactivityresultevent

Onconfigurationchangedevent

ONCONTENTC hangedevent

Oncontentviewavailableevent

Oncreateevent

Ondestroyev ent

Onnewintentevent

Onpauseevent

Onrestartevent

onresumeevent< p>onstartevent

Onstopevent

A simple example is as follows:

public class MyActivity extends Roboactivity {//You must ' register ' your listener in the ' current/context by Inje
 Cting it.
 The injection is commonly to the activity,//but can also being done anywhere really.

@Inject protected mylisteners mylisteners; }//In this example, all the listeners are in A//Mylisteners class, but really they could/is an     
Ywhere as long as it ' s registered.     
Can even put the listeners directly to//your activity classes if you like!     
 Class Mylisteners {//any method with the void return type and A//single parameter with @Observes annotation     
 Can is used as an event listener.     
 This is one listens to Onresume. public void Dosomethingonresume (@Observes onresumeevent onresume) {ln.d (' called Dosomethingonresume in Onre     
 Sume ");  }//As you might expect, some events can//have parameters. The OnCreate Event//has the SavedinstancestaTe parameter that//android passes to OnCreate (Bundle) public void Dosomethingelseoncreate (@Observes on     

 CreateEvent onCreate) {ln.d ("OnCreate savedinstancestate is%s", Oncreate.getsavedinstancestate ())}     
 Course, can have multiple//listeners for a given event.     
 Note that ordering of listener execution//is indeterminate!     
 public void xxx (@Observes oncreateevent onCreate) {ln.d ("Hello, world!") }     
}

Notes on events are as follows:

Use @inject to define the Listener of events in the context.

An event can only be transmitted in a particular context (activity) and not sent across a context, accepted.

event, in addition to providing the context-related events listed above, can also use custom events.

@observes can be applied only to methods, not to constructors.

The following is a custom event myevent that is sent by observer this custom event to receive custom events.

Public 

class Eventdemo extends Roboactivity {     
          
 @Inject protected eventmanager eventmanager;     
 @InjectView (R.id.button) button button;     
          
 @Override public 
 void OnCreate (Bundle savedinstancestate) {     
 super.oncreate (savedinstancestate);     
 Setcontentview (R.layout.eventdemo);     
 Button.setonclicklistener (Mgolistener);     
 }     

 Private Onclicklistener Mgolistener = new Onclicklistener ()     
 {public     
 void OnClick (View v)     
 {     
 Eventmanager.fire (Eventdemo.this,new myevent ());     
 }     
 ;     

 protected void Handleevent (@Observes myevent event) {     
 Toast.maketext (this, "Custom event",     
 toast.length_ LONG). Show ();     
 }     
          
Class myevent{     
 //put any memeber your want here.     
}

This example downloads: Http://www.imobilebbs.com/download/android/roboguice/EventDemo.zip

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