I guess for that you need to get the data stored in a file that too in well structured manner and then you can draw a graph , its possible but it will  also  need certain logic precisely in order to keep relations you mentioned in questions .

The purpose is not clear, do you want to use this graph to know which question to ask next? present results? What I would is to separate concepts: the questions, possible answers, etc should be in their own tables, and create extra tables which maps topics (nodes) to questions and prerequisites (edges). In any case if you use the default android database (sqlite) than you can view/edit the database through an sqlite browser outside the android environment, making it easy to test by query your db and see if this has the expected behavior.

If I understand the question (and supposing you're using java), you have a dataset and now you need to create the relative graph representation. If you don't want to implement your own graph representation, I suggest you to use the graphml or jsonml standards; take a look at Tinkerpop or jung (i prefer the first, but there are also others of ones libraries), the docs are simple with good examples. I hope I've answered to your question.

Best regards.

http://tinkerpop.incubator.apache.org/

Dear Behnaz,

I suggest the open source MPAndroidChart library. I am using it to my projects and it works well.

https://github.com/PhilJay/MPAndroidChart

Best regards,

Jozsef

Dear Behnaz,

your question is not clear but I'll answer what I understood. I think you are asking about storing your data in a graph representation. You can actually use Neo4j graph database ( http://neo4j.com/ ). So easy and rapid to implement as well as the availability REST API interface that you can use with any programming language JAVA, PYthon..etc.

I hope I answered your question,

Regards,

Neamat

You can get ride on already available charts libraries there are many libraries available to place points on charts out of which one is https://github.com/lecho/hellocharts-android

you can take a look and let me know is it useful for you or not? best luck

My understanding is that you want to visualise your stored data (aka dynamic v.) in such a way that a taxonomy can be established to show questions with common attributes (such as subject area). With a well designed database (see Carlos Pereira's comment) and any opensource mobile visualisation library (AndroidPlot is a good one) you can achieve this. Your main concern is to ensure that your choice is what suits your app UI, expected UX and performance requirements best. There might be a bit of a learning curve with testing different libraries, but totally worth it. Happy coding.

http://androidplot.com/