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Example of dependency injection, referenced by https://www.reddit.com/r/androiddev/comments/aw860w/doesnt_dependency_injection_break_encapsulation/ehku2tt/
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public class LocalProfileAPI implements ProfileAPI { | |
public Profile retrieveProfile() { | |
/*... retrieve from DB or something ...*/ | |
return new Profile(); | |
} | |
} |
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class Model { | |
private ProfileAPI api; | |
@Inject | |
public Model(ProfileAPI api) { | |
this.api = api; | |
} | |
public Profile getProfile() { | |
return api.retrieveProfile(); | |
} | |
} |
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class Presenter { | |
private Model model; | |
@Inject | |
public Presenter(Model model) { | |
this.model = model; | |
} | |
public void showProfile() { | |
Profile profile = model.getProfile(); | |
doSomethingWithProfile(); | |
} | |
private void doSomethingWithProfile() { | |
/*...*/ | |
} | |
} |
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interface ProfileAPI { | |
public Profile retrieveProfile(); | |
} |
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public class RemoteProfileAPI implements ProfileAPI { | |
public Profile retrieveProfile() { | |
/*... retrieve from Remote or something ...*/ | |
return new Profile(); | |
} | |
} |
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class Screen { | |
private Presenter presenter; | |
@Inject | |
public Screen(Presenter presenter) { | |
this.presenter = presenter; | |
} | |
public void onSomeEvent(){ | |
presenter.showProfile(); | |
} | |
} |
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