Develop Reference

Disable screenshot function in Android and iOS app

I'm interested in creating an access control app for a project in college. The app would contain a barcode/QR code to read the person identity when placed under a scanner.
To limit unauthorised persons from obtaining access to the barcode used for entry I was hoping to disable a person from taking a screenshot whilst in the app. Is this feature possible?
Thanks in advance!

Dear friend you have to do some tricky thing for this thing as you can't actually prevent user to take screenshot or getting the picture from another mobile,
so this thing is not gonna solve only by mobile side.
So whats the best approch for this?
According to me you should handle this thing with the help of server side communication store the expiry seconds in QR code data set like:
{
"id" : "some-user-id",
"ency-key" : "your-latest-key",
"expiry" : "60"
}
here your ency-key will be your latest encription key that you will get from server by using webservice or something like that. Now the tricky thing is that this key is only valied for 60 seconds (OR as per your requirement) after getting this key from server, server should refresh the key so if the unauthorized user will try to access the same code by storing in screenshot or photo, he/she will not be able to access the system.
Thats from my side :) hope this thing may help you

Answer for iOS: You can't actually prevent user to take screenshot, however you can find if user have just taken screenshot by observing UIApplicationUserDidTakeScreenshotNotification notification and then you can either delete such photo from gallery(if permission have been given) though this is not good at all or you can blur the image. but my point here is, even if you, somehow manage to prevent screenshot, how you gonna prevent user to take photo from other device?
PS. I am not sure if its possible in android or not.

Android transfer object data through different device, same app

I want to implement a feature in an app where users can add friends and check and compare each other stats from the java objects created, which involves a few subclasses.
I was wondering if anyone know what the best way to approach this would be?
The only thing that pops out is using Firebase. Where the user would click a button to upload the data to Firebase with a UUID link, and then give the UUID to the other user, where he/she would have to manually type the UUID in a textfield, and it gets the data from Firebase.
Would method be viable and is there any other better options?
Thanks

I would probably create a file (you can invent any ending) with all info you need displayed in json. That file can be shared via Whatsapp or what ever and imported in your app?
But I don't know what "stats" that are that the users can compare but I think they will change from time to time? So I would guess an online service would be better because otherwise to update, they have to share again and again?

To show other Apps while exiting

I wish to show my other apps under "More Apps" section of while exiting.
What is the the best way to do it ?
Is there is any common library to add my app icon and link of my app. so that It can be shown at the time of interest. It would be great if it is scrollable
Thanks is Advance !

Well since these are your apps you can simply hard-code the icons into a RecyclerView or ListView along with a link leading to Google Play. This really doesn't require a third-party liubrary as it can easily be done by yourself.
If you really want to allow for future expansiveness, you could use a cloud platform like parse where you store the names of different apps as parse objects along with a link and an image (logo). Then you could write a custom adapter for your list which takes the parse objects from your cloud, and populates itself with the logo,link,title,etc.
This is really a matter of comfort and preference rather than finding a library to do this for you. If you need help, feel free to ask, and good luck!

You can show a 'Dialog' asking if the user cares to check some of your other apps with two available options: 'yes' and 'no'. If the user chooses
'no', close the dialog, if he chooses 'yes' - redirect him/her to the following url:
https://play.google.com/store/apps/developer?id={Your-Google-Account-Name}
This link will be opened either in the browser or in the Google Play app, whichever your user prefers, and it'll show him/her the list of all your apps.

You can try overriding finish() (Documentation) method inside your Activity. If you're using multiple Activities, consider creating a base Activity so that you don't have to implement this in each Activity.
That said, please consider not doing this. As a user, I'd be super annoyed if I'm trying to close your app and you're not letting me do it. That'd be instant uninstallation from my side. Never annoy your users. Respect their experience.

Android: how to integrate a 'report abuse' mechanism in my app.?

I'm currently working on my first serious app., and I would like to have some sort of contol on the data that users can enter.
Specifically, my app. allows users to write some text content (imagine something like a 'tweet'), and upload pictures.
I would like to prevent them from writing inappropriate text, and uploading offensive pictures for instance.
What I thought of doing, is to allow something like 'report abuse' button, where users who find some content offesive, can press - in which case relevent data will be saved, and later checked, to decide if indeed an inappropriate usage happened (maybe by some sort of server-side code).
As I said, I'm a beginner in android development, and I would really love to hear your suggestions and guiding. Perhaps it is something over my league for now? Maybe you know of such thing that already exists?
My app. uses Parse.com as its DB.
I would really appriciate your help.
Thank you.

I'm developing as well an app with parse and I also had to integrate in it a report button for the user.
The way I did it is simple:
In every Pf User object, I created a field of type counter named "reportCounter" while in the PFObject created by the user (it can be a string, a picture, etc.)I created a boolean field named "isReported". When a user find some inappropriate content he can report it through the dedicated button. The PFObject relative to that content gets its isReported field changed to YES and a parse background job checks every day for all the PFObjects, incrementing the reportCounter field of the owner-creator of the content and sending a report e-mail to the administrator. In this way you can keep also a record to see if a particular user is behaving badly. Just take a look at the Parse documentation about background-jobs. It's pretty good.
I hope this will help.

Which way is better efficient to log user's activites(history) in android?

I develop the app which is provide some information to general user. it is not only showing info but also curating and recommending further detail info depending on users history;what the users clicked, searched and acted on the app. (like a google targeting AD).
For this, I have to accumulate user's activites on apps. (which button was clicked, when did they turn on the app and so on...)
For this, I have two ideas.
1. let the app to leave their log text file in local device then append lines in it whenever user act, and upload it when they turn off the app on server DB.[like a batch]
-OR-
2. let the app, update db everytime when user acts something on app by http-post.[like a realtime]
Which way is common tactics(or popular ways) on real field? or can you suggest another way?
thanks for reading.