android - How to inject same Dagger 2 dependency with different implementations based on the Context? -


i have dagger 2 dependency provided differently if it’s activity or other context instance (e.g., service). both refer same interface implementation varies. how organise using dagger 2?

right now, i’m trying 2 different components, activitycomponent , contextcomponent respective modules follows:

@activityscope         @subcomponent(               modules = {                     activitymodule.class,                     contextmodule.class   })         public interface activitycomponent { }  @module     public class activitymodule {      @provides     @myactivityqualifier     public myobject providemyobject() {     } }   @contextscope @subcomponent(           modules = {     contextmodule.class   })     public interface contextcomponent {    }  @module public class contextmodule.class {      @provides     public myobject providemyobject() {     } }

then, if i’m using myobject in activity, have add qualifier follows:

@inject @myactivityqualifier myobject myobject;

this feels wrong i’m not sure why. there better way?

you using subcomponents.
question is: can or should both objects "visible" (usable, injectable, ...) @ same time?

  • yes: will have use sort of qualifier. or else can't distinguish them.
  • no: can "hide" them not exposing dependency dependent component. have use normal component instead of @subcomponent in case, , don't add getmyinterface() method parent component.

and there aren't other options, because have 2 components dependent on each other. approach looks fine information provide.

note can qualify one of implementations. in project, use qualified @named("public") annotation common implementation without user data. if don't add qualifier other 1 (unqualified).

with independent components, e.g. activityacomponent , activitybcomponent switch implementation gets provided using different modules.


-

Comments

Post a Comment

Popular posts from this blog

scala - 'wrong top statement declaration' when using slick in IntelliJ -

Image
i'm porting project scala 2.9 2.10, therefore have use slick instead of scalaquery. i'm using slick 2.1.0 since supports ms access. according this tutorial , upgrade guide changed robs object class , added val robs : why error message wrong top statement declaration , how rid of it? edit: i'm new scala... according this question seems can't put val outside of methods or classes, right? code above directly in packge. right approach slick then? should move code in class or trait? according this changed val robs = tablequery[robs] to object robs extends tablequery(new robs(_)) {} . no warnings or errors anymore. :)
Read more

c# - DevExpress.Wpf.Grid.InfiniteGridSizeException was unhandled -

Image
when using devexpress, see error: devexpress.wpf.grid.infinitegridsizeexception unhandled message="by default, infinite grid height not allowed since grid rows rendered , hence grid work slowly. fix issue, should place grid container give finite height grid, or should manually specify grid's height or maxheight. note can avoid exception setting gridcontrol.allowinfinitegridsize static property true, in case grid run slowly." the problem dxgrid has infinite height. to fix, set height non-infinite. snoop absolutely invaluable this: if "height" xaml element infinite (i.e. 0 or nan ), can set using one of following: option 1: height="{binding path=actualheight, relativesource={relativesource mode=findancestor, ancestortype=uielement}}" option 2: verticalalignment="stretch" option 3: height="auto" hint: use verticalalignment="stretch" if child of grid <rowdefinition height=...
Read more

PySide and Qt Properties: Connecting signals from Python to QML -

i trying run simple pyside appliccation design made in qml. call function in qml python in separated thread. i have following qml view: import qt 4.7 rectangle { visible: true width: 100; height: 100 color: "lightgrey" text { id: datestr objectname: "datestr" x: 10 y: 10 text: "init text" font.pixelsize: 12 function updatedata(text) { datestr.text = qstr(text) console.log("you said: " + text) } } } here application: some imports.... #!/usr/bin/python import sys import time pyside import qtdeclarative, qtcore pyside.qtgui import qapplication pyside.qtdeclarative import qdeclarativeview the qthread worker.... #worker thread class worker(qtcore.qthread): updateprogress = qtcore.signal(int) def __init__(self, child): qtcore.qthread.__init__(self) self.child = child def run(self): ...
Read more