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Lifecycle???????????????????????????????Activity?Fragment?????????????????????????????????????????????????

1. ??

Lifecycle????????????????Fragment?Activity????????????????????????????????????????????Presenter????????????????????

????

class MainActivity : AppCompatActivity() {    override fun onCreate(savedInstanceState: Bundle?) {        super.onCreate(savedInstanceState)        setContentView(R.layout.activity_main)        lifecycle.addObserver(Presenter())    }}class Presenter : LifecycleObserver {    @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)    fun onCreate() {        println("presenter oncreate")    }    @OnLifecycleEvent(Lifecycle.Event.ON_START)    fun onStart() {        println("presenter onstart")    }    // ????????...}

???????Presenter?Activity????????????????????????????Presenter??????Activity?????????????????????????????

2. ??

2.1 ?????

Lifecycle??????????????????LifecycleRegistry???????????????LifecycleObserver???????????????????

2.2 ??????

Lifecycle????Fragment?Activity????????????SupportActivity??LifecycleOwner????????????LifecycleRegistry??Fragment?Activity???????????LifecycleRegistry??????????????LifecycleObserver?

2.3 LifecycleRegistry??

LifecycleRegistry?Lifecycle???????????????????????????

???????Lifecycle??????????????????????????????????????

????????????????????

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