Android SD Card Resource Manager API? ?

Will Android SD card resource manager API do ? Still need to manually write ah ? ?
I want to write an SD card reader txt documents , but also can not manually enter the path ah ? ? Xiangnong a resource manager to achieve.
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android with sdcard related classes on an Environment, which did not seem to realize this API function method you say it .
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multi-level traversal to do a similar thing folder
listview loaded with record path .
Click for path then passes through the intent of what value then open
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Does anyone know ah ? ? Had to write himself a ah ? ?
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ah, write himself a bar ~ ~