繼續(xù)Dagger2學(xué)習(xí)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();    }}其中Lazy(懶加載)的作用好比component初始化了一個(gè)present對(duì)象,然后放到一個(gè)池子里,需要的時(shí)候就get它,所以你每次get的時(shí)候拿到的對(duì)象都是同一個(gè);并且當(dāng)你第一次去get時(shí),它才會(huì)去初始化這個(gè)實(shí)例.
procider(強(qiáng)制加載)的作用:
1:同上當(dāng)你第一次去get時(shí),它才會(huì)去初始化這個(gè)實(shí)例
2:后面當(dāng)你去get這個(gè)實(shí)例時(shí),是否為同一個(gè),取決于他Module里實(shí)現(xiàn)的方式