Recommended resources for understanding concepts in Android

After a relatively easy coast to simple app coding, I would like to understand better the intricate relationships between various conceptual components in Android.

More specifically, I would like to understand what is Runnable, Looper and Handler.

As you may noticed, the above 3 terms are links to formal documentation in http://developer.android.com so my question may seem strange, so let me explain: That documentation may be perfect for someone who already understands how things work in Android, but I need something that sequentially walks through fundamentals, building on top of previous concepts.

To summarize, I need some sort of tutorial on core i开发者_JAVA技巧nner building blocks of Android. Can you recommend one?

---

The detailed article Painless Threading is probably your best resource for threading on Android.

The moral of the story is that AsyncTask makes multithreading easier for you.

---

Runnable is a core Java interface - it represents a code part that can be run (usually by a specific thread).

Handler is an Android class that is responsible for posting a Runnable\Message so that a particular thread will run or process them (in a specific order).

Looper is the structure that holds the Runnable\Message queue that a HandlerThread will read from.