Android jetpack LifeCycle 在Application中的应用

Posted 2022-05-20 安果移不动

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

创作打卡挑战赛 赢取流量/现金/CSDN周边激励大奖