android how to read sd card and display the picture

Such as the title , because new to andriod mobile software development , so he did not know the process to achieve this , which probably talk about ideas and the realization of this class used , thanks
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http://puras.javaeye.com/blog/513142
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you can call the phone comes with a camera , but also can surfaceview to develop their own , but with the surfaceview this method there are many online , I tried a lot, but I never succeeded , I suggest you call the phone comes with a camera . Search the web search , the best articles found abroad . Many domestic not stored in SDCard inside
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via streaming
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contentprovider comes with android