組件依賴另一個組件的情況

public class PResent {    String ss = "呵呵噠";    public Present(Context context) {    }}
@Modulepublic class AppModule {    Context mContext;    public AppModule(Context context) {        this.mContext = context;    }    @Provides    public Context provicesContext(){        return mContext;    }}
@Component(modules = {AppModule.class})public interface AppComponent {    //暴露一個接口    Context proContext();}
@Modulepublic class ActivityModule {    @Provides    Present providesPresent(Context context){        return new Present(context);    }}
@Component(dependencies = {AppComponent.class},modules = {ActivityModule.class})public interface ActivityComponent {    void injectActivity(Main3Activity activity);}
public class Main3Activity extends AppCompatActivity {    @Inject    Present mPresent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main3);        AppComponent appComponent = DaggerAppComponent.builder().appModule(new AppModule(this)).build();        ActivityComponent activityComponent = DaggerActivityComponent.builder()                .appComponent(appComponent)                .activityModule(new ActivityModule())                .build();        activityComponent.injectActivity(this);        Log.e("","******************"+mPresent.ss);    }}打印結(jié)果為:**********呵呵噠
其中的關鍵點:
1:AppModule必須提供對象的接口(proContext)
2:ActivityComponent必須添加dependencies=xxxx