繼續Dagger2學習筆記之dependence的demo,將activity更改下

public class Main3Activity extends AppCompatActivity {

    @PresentForContext
    @Inject
Lazy<Present>     lazy;
    @PresentForName
    @Inject
Provider<Present> provider;
    @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);
        Present present = lazy.get();
        Present present1 = provider.get();
    }
}

procider(強制載入)的作用:

1:同上當你第一次去get時,它才會去初始化這個例項

2:後面當你去get這個例項時,是否為同一個,取決於他Module裡實現的方式