What is the use of intents and context in android - android

I am new to android My question is what are intents and context in Android. I am not able to find out there use in android application why they are used when they are used .For me as a beginner these are quite confusing. I had read many Articles but I am not able to determine there meaning and I am not able to use them flexibly can any body help me any help would very appreciable. Thanks for reading

You might want to read Android Application Fundamentals to understand them.

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Charts/Graphs in Android Studio

I'm developing a dashboard app where I need several different charts/graphs. Is there any way that I can create them without any library? And if so, can you teach me how?
Thanks in advance!
If you want to learn how to use a chart properly I suggest you to watch this tutorial.
After that you can start something with live data and/or github arsenal implementations. But first start with the fundamentals. Hope that answered your question also.

Graphs/Charts in Android

I'm a beginner in android application development. I got a requirement where I have to show some statistics in the form of graphs/charts. I would like to if there is any API as such which would suffice this requirement in android. Else, I would like to the means the other best means that would make this easy. I referred other questions regarding this, but I'm unable to decide basing on them. Help needed as soon as possible.
This is good , easy to use and if You have problem PhilJay or someone else will help you on stack:
https://github.com/PhilJay/MPAndroidChart

Android Source Code- writing custom services to startup at boot

I'm currently trying to learn how to write custom services and have them start up at boot, all in the Android Source code.
Could anyone point me to the right references (books, online articles, etc) that discuss this specific topic and as well as understanding AOSP/Android operating system in general?
To learn how to write a custom Service you can look at the docs here.
You'll want to learn about Activities and their Lifecycle in the docs here
And you'll want to learn about the Application fundamentals in the docs here
Once you have an idea of how everything works fundamentally, there are tons of tutorials on the internet that will show you how to code specific things. A simple Google search will find you all of that.
Hope this helps!

Book, tutorials or sources for creating rich/complex interface (android)

Pretty much the title. I'm new in android development. So, I'm interesting about developing rich application, but cannot find a good tutorials. I would be realy appreciated if someone guide me some resources for start.
Maybe there is some open source project where I can find helpful information?
Thank you
UPD1
Is there some guide from start to end where explained how to make an application such a twitter app? Or any other kind of complex and start to end described application?
I would recommend starting here. The Google UI guidelines. It explains the different API for creating UI elements and also gets into pros/cons about icons, menus, fonts and so on.
http://developer.android.com/design/index.html
http://appinventor.mit.edu/explore/sites/teach.appinventor.mit.edu/files/MIT%20App%20Inventor%20Development%20Overview_0.pdf
http://cs.usfca.edu/~wolber/appinventor/bookSplits/ch4NoTexting.pdf
These are some of the links that i found very useful for complex android app development.

Where to get detail description on understanding android

I found lots of books on android which give basic concept on android Example (calling Activity, Intent, service, broadcast receivers etc). But I want to know brief description on all these concept. in os level or in api level how does it work. Also how connection with wifi or 3g works in api level.
I want to know brief understanding on android. Can anyone suggest any tutorial or book to get detail understanding on android.
Thanks
Start with the Android Developer's Guide. http://developer.android.com/guide/index.html
I would recommend to buy a book. For me Professional Android 2 Application Development was really good. But probably now there is better (up to date) alternative.
Anyway I find reading books much easier starter than separate tutorials and articles.
If you want a really detailed view, just look at the source code.

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