First of all if you already visit http://developer.android.com/index.html, you may have downloaded android SDK and install eclipse(or any other IDE fo java developing, Intellij IDEA fro example)
Then you can explore origanl site to find some good examples and tutorials, like:
1.http://developer.android.com/resources/tutorials/hello-world.html
2. http://developer.android.com/resources/samples/index.html
3. http://developer.android.com/resources/articles/index.html
Then you feel that it's not enough for you you may go further:
4. http://developer.android.com/resources/community-groups.html
Stackoverflow is most helpfull site for everyone who would like to code simple apps. Most of your questions is alredy answered there :) Or linked to other forums and blogs like:
- http://www.anddev.org/viewforum.php?f=8
- https://github.com/commonsguy/cw-advandroid
Also you should read at least one of these books:
http://www.amazon.com/Android-Programming-Books/lm/R3IDV45VDVAY3M/ref=niosim?tag=httpcommonsco-20
Here are my favorites:
http://www.amazon.com/Coders-Guide-Advanced-Android-Development/dp/ ***-***-**** /ref=cmlmftit7
http://www.amazon.com/Beginning-Android-2-Mark-Murphy/dp/ ***-***-**** /ref=cmlmftit6
http://www.amazon.com/Pro-Android-2-Sayed-Hashimi/dp/ ***-***-**** /ref=cmlmftit5
Also:
http://groups.google.com/group/android-developers - for more experienced coders
And for the last, example of blogs and articles with helpfull certain info, like XML parsers, http requests, home app widgets and other usefull tutorials.
7.http://www.higherpass.com/Android/Tutorials/
http://www.tutorialforandroid.com/
http://www.javacodegeeks.com/
http://www.ibm.com/developerworks/opensource/library/x-android/
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