Need tutorials on Content providers in android [closed]

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I am in desperate need of good tutorials on Content Providers in Android. I have been searching in the web for the tutorials but none could give me a clear idea on how content providers work. I'll be grateful if anyone can provide me with sample codes of the projects tha开发者_StackOverflow中文版t implement content providers...

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http://github.com/synic/SupaCount/blob/master/src/org/vimtips/supacount/CountDownProvider.java

Here's the provider for a countdown app I wrote, it's based on the information I found in the Commonsware "The Busy Coder's Guide to Android Development"

It's not complicated stuff, just tedious. Here's a lot of the code I'm using to access it.