Where can I find the android’s app code? [closed]

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I want to write something for android , I am new comer for it,I know the java,but I need some example for the android’s app for learn,can you tell me where to find the material?(eg:http://source.android.com/source/index.html)

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The android sdk site provides some sample code you can work with:

http://developer.android.com/resources/samples/get.html

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I have not found a single go to site for Android sample code and tutorials but I have found there is lots of examples out there. What I have been doing is Googleing strings like "android theme tutorial" as I need them. Doing that has so far not failed to find helpful information and examples. Here are a few recent searches I did an a good example I found for each (this also turns up lots of hits at http://developer.android.com which are excellent):

android theme tutorial

android TabHost tutorial

android spinner tutorial

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You can browse all Android source code at https://android.googlesource.com. All of the git repositories with the word "apps" each contain the sources for one of the standard apps. For example, platform/packages/apps/Calculator contains the sources for the Calculator app.