android - How to get the activity reference before its oncreate gets called during testing -

how reference of activity before oncreate called. while under test. use activitytestrule junit rule. reason requirement want inject mocks activity tests.

public class myactivity extends activity{      mycomponent mycomponent;      @override     public void oncreate(bundle savedinstancestate){         super.oncreate(savedinstancestate);         if(mycomponent==null){             mycomponent ... //initialise dagger component         }         mycomponent.inject(this);         ...     }      public void setcomponent(mycomponent comp){         this.mycomponent = comp;     } }  public class mytest{      @rule     public activitytestrule<myactivity> intentstestrule = new activitytestrule<>(myactivity.class);       mycomponent myfakecomponent;      @before                                           public void setup() {                                 myactivity activity = intentstestrule.getactivity();           activity.setcomponent(myfakecomponent);     }                                                  @test     public void testmethod1(){...} }  

as per documentation, you're doing here wrong.

@rule public activitytestrule<myactivity> intentstestrule = new activitytestrule<>(myactivity.class);  mycomponent myfakecomponent;  @before                                       public void setup() {                             myactivity activity = intentstestrule.getactivity();       activity.setcomponent(myfakecomponent); }               

because,

this rule provides functional testing of single activity. activity under test launched before each test annotated test , before methods annotated @before. terminated after test completed , methods annotated after finished. during duration of test able manipulate activity directly.

however!

protected void beforeactivitylaunched () 

override method execute code should run before activity created , launched. method called before each test method, including method annotated @before.

therefore, if move initialization of mainactivitycomponent outside activity place mockable, you'll able tinker before main activity created.

edit:

another possible solution lazily initiate activity per link.

@rule public activitytestrule<notedetailactivity> mnotedetailactivitytestrule =         new activitytestrule<>(notedetailactivity.class, true /* initial touch mode  */,                 false /* lazily launch activity */);  @before public void intentwithstubbednoteid() {    // add note stub fake service api layer.    fakenotesserviceapiimpl.addnotes(note);     // lazily start activity activitytestrule time inject start intent    intent startintent = new intent();    startintent.putextra(notedetailactivity.extra_note_id, note.getid());    mnotedetailactivitytestrule.launchactivity(startintent);     registeridlingresource(); }