Android jetpack LifeCycle 在Application中的应用

先写一个类继承观察者 并增加注解

package com.anguomob.jecpack.observer

import android.util.Log
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleObserver
import androidx.lifecycle.OnLifecycleEvent

class ApplicationObserver : LifecycleObserver {
    private val TAG = "ApplicationObserver"

    @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
    public fun onCreate() {
        Log.e(TAG, "onCreate: ")
    }


    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    public fun onStart() {
        Log.e(TAG, "onStart: ")
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_RESUME)
    public fun onResume() {
        Log.e(TAG, "onResume: ")
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
    public fun onPause() {
        Log.e(TAG, "onPause: ")
    }


    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    public fun onStop() {
        Log.e(TAG, "onStop: ")
    }


    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
    public fun onDestory() {
        Log.e(TAG, "onDestory: ")
    }


}

新建MyApplication类以此来进行对lifecycler的调用

 调用方法也很简单

package com.anguomob.jecpack;

import android.app.Application;

import androidx.lifecycle.ProcessLifecycleOwner;

import com.anguomob.jecpack.observer.ApplicationObserver;

public class MyApp extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        //针对整个应用程序的监听，与Activity数量无关，
        ProcessLifecycleOwner.get().getLifecycle().addObserver(new ApplicationObserver());
    }

}

但是这个生命周期永远也走不到onDestory当中去。

好处就是 帮助开发者建立可感知的生命周期

组件在其内部管理自己的生命周期 从而降低模块的耦合度

降低内存泄露的可能性

Activitiy Fragment Service Application 均支持LifeCycler

2021年最全面的Jetpack系统学习课程，看他就够了，更新中_哔哩哔哩_bilibili

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