(ii) monitor user behavior and app online status and online duration only through application

First to implement the function, or first from the API to find. See if there's anything you want. This is actually listening to the status of activity within the app. What to do?

To an API location: http://www.android-doc.com/reference/android/app/Application.html

　　

Did you see that? Here's a way to registeractivitylifecyclecallbacks , isn't that listening? Look at the callback, go in and see.

I'll go, this service is not too good. What do you want? Did you see that? The life cycle of all activity can be obtained. So. How to use it has become a matter of consideration.

Here's what I do statistics active and the duration of the

Importandroid.app.Activity;Importandroid.app.Application;ImportAndroid.content.Context;ImportAndroid.os.Bundle;ImportAndroid.util.Log;ImportJava.util.HashMap;ImportJava.util.Map;/*** Created by admin on 2018/3/2. *@authorCxx * Note: The user's actions are judged based on the activity's life cycle. End the app timing statistics in both cases. * One is: When the activity on top or top of the stack is suspended, it is time to force the process to be killed. * Two types are: when the user returns to the bottom level of activity, and finish. That is: Empty the activity stack end app*/ Public classTimerecord {Private BooleanIsappalive =true;//determine if the app timer is over, and if it ends, but the app hasn't been killed, use this field to revive the timekeeping function    Private BooleanIsswitchactivity =false; Private BooleanIsappexit =false; PrivateString topactivity; PrivateMetaclass Helper; Privatemap<string,string> map =NewHashmap<>(); Private LongTimestart = 0;//time stamp to start timing    PrivateString TAG = "Cxx";  Public voidInitFinalContext Context,metaclass Metaclass) {Application Application=(application) Context.getapplicationcontext (); //Escalate Active VolumeSystem.out.println (tag+ "escalation activity-Initialize");  This. Helper =Metaclass;        Helper.reportactive (); Timestart= System.currenttimemillis ()/1000; System.out.println (TAG+ "Start Timer-Initialize" +Timestart); Application.registeractivitylifecyclecallbacks (Newapplication.activitylifecyclecallbacks () {@Override Public voidonactivitycreated (activity activity, bundle bundle) {topactivity=Activity.getclass (). Getsimplename ();                Map.put (topactivity,topactivity); Isappalive=true; Isswitchactivity=false; System.out.println (TAG+ "Created_activity:" +Activity.getclass (). Getsimplename ()); } @Override Public voidonactivitystarted (activity activity) {SYSTEM.OUT.PRINTLN (TAG+ "Started_activity:" +Activity.getclass (). Getsimplename ()); } @Override Public voidonactivityresumed (activity activity) {SYSTEM.OUT.PRINTLN (TAG+ "Resumed_activity:" +Activity.getclass (). Getsimplename ()); if(!Activity.getclass (). Getsimplename (). Equals (topactivity)) {isswitchactivity=true; }Else{isswitchactivity=false; } topactivity=Activity.getclass (). Getsimplename (); if(!isappalive| |isappexit) {Isappexit=false; System.out.println (TAG+ "Escalation of active volume--onresumed");                    Helper.reportactive (); Timestart= System.currenttimemillis ()/1000; System.out.println (TAG+ "Start Chronograph--onresumed" +Timestart); Isappalive=true; }} @Override Public voidonactivitypaused (activity activity) {} @Override Public voidonactivitystopped (activity activity) {SYSTEM.OUT.PRINTLN (TAG+ "Stop_activity:" +Activity.getclass (). Getsimplename ()); System.out.println (TAG+ "Stop_topactivity:" +topactivity); if(Topactivity.equals (Activity.getclass (). Getsimplename ())) {if(!isswitchactivity) {                        LongTimeend = System.currenttimemillis ()/1000; if(helper!=NULL){                            LongTimegap = timeend-Timestart; String Onlinetime=string.valueof (TIMEGAP); System.out.println (TAG+ "timed end--stopped:" +timeend); System.out.println (TAG+ "Timing End length--stopped:" +onlinetime);                        Helper.reportonline (Onlinetime); } isappalive=false; } }} @Override Public voidonactivitysaveinstancestate (activity activity, bundle bundle) {} @Override Public voidonactivitydestroyed (activity activity) {Map.Remove (Activity.getclass (). Getsimplename ()); if(Map.size () ==0&&isappalive) {                    LongTimeend = System.currenttimemillis ()/1000; if(helper!=NULL){                        LongTimegap = timeend-Timestart; String Onlinetime=string.valueof (TIMEGAP); System.out.println (TAG+ "timed end--destory:" +timeend); System.out.println (TAG+ "Timing End length--destory:" +onlinetime);                    Helper.reportonline (Onlinetime); } isappalive=false; }                if(Map.size () ==0) {Isappexit=true;    }            }        }); }}

(ii) monitor user behavior and app online status and online duration only through application