Which database to use for educational android application?? [closed] - android

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I am developing one android application for which I need to use database but I am confused between MySQL and SQLite. My application consists of one questionnaire having 4-5 test papers and generates automatic report on the basis of answers given by user. But as a newbie in the area of application development, I couldn't decide which database is good for my application.

Is this database supposed to be on the phone, or is it supposed to be on a server where the results can be saved for grading/other use? If its on the device only, then SQLite is your only option. If its meant for use on a server where results are being sent back to, then SQLite is probably not the right choice- MySql, Posgresql, or other similar product would make more sense.

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I'm a front-end developer and I am going to write an application in NativeScript because I can use Angular. Besides, I can can save time and create a website and applications for iOS and Android.
I'm considering several possibilities:
Using Firebase, but I do not know if it is possible to share one
resource (database etc) between 3 solutions (web / ios / android) at
the same time.
I know a bit PHP and I was thinking about some micro framework with
OAuth 2.0 integration
What are your experiences? The application will contain a large database of products, photos, ratings, comments and a small community.

How can I get the number of online users now in my app [closed]

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is there any website to get online users now in my app or any good idea?
I tried to using onStart and onDestory but do not work well Are there other ideas
Best way is to use Socket for more accurate data
This way your server-side and mobile app can maintain real-time comms, which can be used in more than just tracking who is online you can even track in which activity they users are.
if you want something with less code you can use fabric KPI which can track alot more things like content view - Search - share -Rated content - etc.
NOTE
google bought fabric and right now they are working on migrating all of fabric features to their firebase service.

Tracking location of Android devices [closed]

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I am developing a project which is based on android, with which I can track location of installed users in real time.i.e all those people who will install my app will allow their location to be tracked by their friends when needed,based on permissions given to contacts.
I am familiar with java and android programming. I want to know how to start that what all things i need to use. Any brief description on the working methodology of such apps will be very helpful to me.For reference my concept is something similar to this app
https://play.google.com/store/apps/details?id=com.nplay.funa thank you
Hint :- Use Firebase real time database with Google Location API.

how do I create android app using wordpress database? [closed]

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I had completed my website in wordpress,so can I use my wordpress database to connect android app? how? give me perfect references.
you can refer to this video
https://www.youtube.com/watch?v=uFbwW4ERUN0
or check Prabeesh RK android MySQL playlist in youtube to learn more..
only difference will be instead of creating a new database you will already have one.
just ensure whatever tables you create has the table_prefix that matches your $table_prefix in wp-config.php file
Hope this helps
Take care and Happy coding

Open Excel file in a app without installation of excel [closed]

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This is a general question for iOS and Android development. I want to consider if this is possible and gather thoughts from here.
You can imagine this app as a social network app and people can comment/add/edit on each other's post. I want users to add/upload an Excel file from their sides, and then I want other users to view this excel file inside app instead of jumping to Microsoft Excel APP in their phone.
In one sentence, just add an Excel view feature inside of my app. Do you think this is possible? Any existing resources?
Thanks.
For Android you can use http://www.independentsoft.com/jspreadsheet/index.html
No clue about iOS or cross-platform-solutions though.

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