android - Value injected with dagger is null -

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I'm new to dagger and I'm trying to study it about making Android apps and making small Android apps I am I have an application class like this: 

  Expands the class app application {@Override onCreate () {super.onCreate (); Object Graph objectGraph = ObjectGraph Siquette (new app module (this)); ObjectGraph.inject (this); }}   
 and thus module:  
  @Dagger Modules (injects = {App.class, MainActivity.class}) Public class AppModule {Private app app; Public app module (app app) {this.app = app; } Provide @Signaton app (app) {return app; }}   
 More activity in which the app is injected:  
  expanding the MainActivity activity of the public class {@ Inject app app; @ Override on Crate (Bundle Saved InstantState) {Super. NET (Saved Instantstate); SetContentView (R.layout.activity_main); If (app == empty) toast. Make Text (this is, "App is empty", 1000). Show (); }}   
 My app is specified in the Manifest file and breakpoints starts int  App.onCreate () .  
 Am I missing something? Can anyone tell me why this is empty? Thank you.  
  
 
 
 Your 'main activity' needs to call ObjectGraft # injection method that you created in your application. Went.  
 You can see it: or it

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