emissary
A simple way to bind and exchange messages between activities and services.
#What emissary do for you
- Perform interprocess communication (IPC) using Messenger.
- Implements the Handler, where the service receives the incoming Message and decides what to do.
#Activity Implementation
Declaring the emissary
private Emissary.IEmissary emissary;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
emissary = Emissary.getInstance(this);
}
Bind a service with emissary connection
Intent intent = new Intent(this, WithLibService.class);
bindService(intent, emissary.getServiceConnection(), Service.BIND_AUTO_CREATE);
Subscribe to a event
emissary.subscribe(WithLibService.ON_CHANGE_TIME_ZONE, new Emissary.EmissaryMessengerCallback() {
@Override
public void data(Bundle data) {
((TextView) findViewById(R.id.time_zone)).setText(data.getString(WithLibService.ARG_TIME_ZONE));
}
}
);
Request something to service
emissary.request(WithLibService.GET_TIME_ZONE, new Emissary.EmissaryMessengerCallback() {
@Override
public void data(Bundle data) {
Toast.makeText(WithLibActivity.this, data.getString(WithLibService.ARG_TIME_ZONE), Toast.LENGTH_SHORT).show();
}
}
);
#Service Implementation
Declaring the Emissary
private final Emissary.IEmissary emissary = Emissary.getInstance(this);
Binding
@Override
public IBinder onBind(Intent intent) {
return emissary.getIBinder();
}
Subscribe to respond activity's request
public void onCreate() {
super.onCreate();
emissary.subscribe(GET_TIME_ZONE, new Emissary.EmissaryMessengerCallback() {
@Override
public void data(Bundle data) {
String timeZone = TimeZone.getDefault().getDisplayName();
Bundle bundle = new Bundle();
bundle.putString(WithLibService.ARG_TIME_ZONE, timeZone);
emissary.send(GET_TIME_ZONE, bundle);
}
}
);
}
Send a Event to Subscribers
String timeZone = TimeZone.getDefault().getDisplayName();
Bundle bundle = new Bundle();
bundle.putString(WithLibService.ARG_TIME_ZONE, timeZone);
emissary.send(ON_CHANGE_TIME_ZONE, bundle);