轉載請標明出處：http://blog.csdn.net/zhaoyanjun6/article/details/117988239
本文出自【趙彥軍的博客】

文章目錄

• 方案一：利用ActivityLifecycleCallbacks監聽所有activity的生命周期
• 方案二：ProcessLifecycleOwner

方案一：利用ActivityLifecycleCallbacks監聽所有activity的生命周期

import android.app.Activity import android.app.Application import android.os.Bundle/*** @author : zhaoyanjun* @time : 2021/6/16* @desc : APP前后臺監聽*/ class ForegroundCallbacks(val mOnAppStatusListener: OnAppStatusListener?) :Application.ActivityLifecycleCallbacks {private var activityStartCount = 0override fun onActivityCreated(activity: Activity, savedInstanceState: Bundle?) {}override fun onActivityStarted(activity: Activity) {activityStartCount++//數值從0變到1說明是從后臺切到前臺if (activityStartCount == 1) {//從后臺切到前臺mOnAppStatusListener?.onBecameForeground()}}override fun onActivityResumed(activity: Activity) {}override fun onActivityPaused(activity: Activity) {}override fun onActivityStopped(activity: Activity) {activityStartCount--;//數值從1到0說明是從前臺切到后臺if (activityStartCount == 0) {//從前臺切到后臺mOnAppStatusListener?.onBecameBackground()}}override fun onActivitySaveInstanceState(activity: Activity, outState: Bundle) {}override fun onActivityDestroyed(activity: Activity) {}interface OnAppStatusListener {fun onBecameForeground()fun onBecameBackground()} }

使用

class MainApplication : Application() {override fun onCreate() {super.onCreate()registerActivityLifecycleCallbacks(ForegroundCallbacks(object :ForegroundCallbacks.OnAppStatusListener {override fun onBecameForeground() {//進入前臺}override fun onBecameBackground() {//進入后臺}}))} }

方案二：ProcessLifecycleOwner

class MainApplication : Application() {override fun onCreate() {super.onCreate()ProcessLifecycleOwner.get().lifecycle.addObserver(object : LifecycleObserver {@OnLifecycleEvent(Lifecycle.Event.ON_STOP)private fun onAppBackground() {// 應用進入后臺}@OnLifecycleEvent(Lifecycle.Event.ON_START)private fun onAppForeground() {// 應用進入前臺}})} } 與50位技術專家面對面20年技術見證，附贈技術全景圖

總結

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