How do Whatsapp Tracking Apps work (existing on Google Play Store) - Android Q&A, Help & Troubleshooting

I have come accross multiple applications on the Play Store which are able to succesfully track the activity of a Whastapp Number.
I am a web developer myself having basic knowledge in WEB API's etc. I was really intrigued with the accuracy of the app called "WhastLog: online last seen" . My question is what do these applications use to track a number because there are no public API's existing as far as i know, and can i myself try to code and reproduce the results. Anyone who can point me in the right direction is appreciated. I have found a few open source projects on GitHub but most of them require QR code authentication.

amoghh said:
I have come accross multiple applications on the Play Store which are able to succesfully track the activity of a Whastapp Number.
I am a web developer myself having basic knowledge in WEB API's etc. I was really intrigued with the accuracy of the app called "WhastLog: online last seen" . My question is what do these applications use to track a number because there are no public API's existing as far as i know, and can i myself try to code and reproduce the results. Anyone who can point me in the right direction is appreciated. I have found a few open source projects on GitHub but most of them require QR code authentication.
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Hey found anything new about this?

@nRaike
De-compile the app in question, then look inside its source code.

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Considering how much Google has done to popularize them, it seems like a glaring oversight that I read about an interesting app on my laptop or desktop, see a link to the bottom of the article, and visit the Market page yet I then have to open up a QR code generator to be able to easily get to that page on my phone. Why doesn't google autogenerate one somewhere on the app page?
Probably because you can directly push the app to your phone from that page. As long as you're logged in, you should be able to install directly from the market site.

[Q] QR Code Contact Info Question

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[Q] Help making Android App with MySQL DB (or other DB if you have suggestions)

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I am new to Android and am looking to solve a problem.
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Change Admob in APK (developer forgot to give me the source code and disappeared)

Hello everyone,
I have an app for my website on Google Play. I ordered it from one guy on fiverr. Now I sold the website and I need to transfer the app associated with it to another Google Play developer account. And I realized that I don't have a source code, APK only. How can I change admob id there?
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Android User Accounts

Hey everyone, I wanted to get more information on how to create User Login in an app, say I wanted my users to login with there google or Facebook account and me able to upload photos, where would the accounts and photos be stored?
I know obviously on my own servers but could anyone point in the right direction more reading material would be great.
I'm just starting out in Android Dev, I'd like to get more information in creating these types of applications, thanks for your help. Appreciate it.
FNostromo said:
Hey everyone, I wanted to get more information on how to create User Login in an app, say I wanted my users to login with there google or Facebook account and me able to upload photos, where would the accounts and photos be stored?
I know obviously on my own servers but could anyone point in the right direction more reading material would be great.
I'm just starting out in Android Dev, I'd like to get more information in creating these types of applications, thanks for your help. Appreciate it.
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Their are a few ways to look at it.
1: How is the login suppose to function?
2: Client side or Server side?
3: The main login files are normally stored sever side.
4: What programming language and or crm are you using?
5: What ever your using for the base operation login would be where you will seek the help for that enviroment.
6: If you are logging in to anything.. Then you would go through a program you made or a web page viewed.
7: Are you trying to Api through apps to jack the login information to login to multiple places? Or one place?
8: Your question is good ,but you need to specify exactly what you want to do ,and the outcome.
9: Are you programing an apk app?
10: Are you making a ROM or ?
11: If you want a user to fly across from Google or Facebook then you would basically intercept the Api of the login and act as if your the actual program. That type of thing is Api related.
12: Every program has it's own programming and api calls and functions... Also special folders Vendor specific.....
Sorta like hacking the vendors api...
That would evolve into security protocols being tampered with. That's why they don't give out that information. But you could sniff the packets via a computer and send and receive responses and also do some reverse engineering on the Api.
Deep level stuff.
Not something people will just answer.
The answer is in the question please tell us from beginning to end what it is you want to accomplish.

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