Java – dagger 2 has no initialization variables

Now I'm trying to implement dagger in my project. I have a problem. Variables initialized in application components are not initialized in my activity. This is my code. Application:

public class MyApplication extends Application {
    private ApplicationComponent applicationComponent;
    @Inject
    public Context context;

    @Override
    public void onCreate() {
        super.onCreate();
        applicationComponent = DaggerApplicationComponent.builder().applicationModule(new ApplicationModule(this)).build();
        applicationComponent.inject(this);
    }

    public ApplicationComponent getApplicationComponent() {
        return applicationComponent;
    }
}

Here is the variable context= null

Activities:

public class MainActivity extends AppCompatActivity {
    private ActivityComponent activityComponent;
    @Inject
    Context context;

    @Override
    protected void onStart() {
        super.onStart();
        activityComponent = DaggerActivityComponent.builder()
                .activityModule(new ActivityModule(this))
                .applicationComponent(((MyApplication) getApplication()).getApplicationComponent())
                .build();
        activityComponent.inject(this);
    }
}

Here context = = null

Dagger:

@Component(modules = {ApplicationModule.class})
public interface ApplicationComponent {
    void inject(MyApplication application);
    Context getApplicationContext();
}

@Component(modules = {ActivityModule.class}, dependencies = {ApplicationComponent.class})
public interface ActivityComponent {
    void inject(MainActivity mainActivity);
}

@Module
public class ApplicationModule {
    private Application application;

    public ApplicationModule(MyApplication application) {
        this.application = application;
    }

    @Provides
    Context provideApplicationContext() {
        return application.getApplicationContext();
    }
}

@Module
public class ActivityModule {
    Activity activity;

    public ActivityModule(MainActivity activity) {
        this.activity = activity;
    }
}

Therefore, dagger only provides "context" in the application class, but not in the mainactivity class. What did I do wrong? Maybe I want to change something

thank you!

resolvent:

The settings are as follows:

public class MyApplication extends Application {
  private ApplicationComponent applicationComponent;

  @Override
  public void onCreate() {
    super.onCreate();
    applicationComponent = DaggerApplicationComponent.builder()
            .applicationModule(new ApplicationModule(this))
            .build();
  }

  public ApplicationComponent getApplicationComponent() {
    return applicationComponent;
  }
}

And your activities:

public class MainActivity extends AppCompatActivity {

  @Inject
  Context context;

  @Override
  protected void onStart() {
    super.onStart();
    ((MyApplication) getApplication()).getApplicationComponent().inject(this);
  }
}