Android Development How to get the path to the external memory card

RT, Baidu also tried 3 kinds, but all failed to seek the guidance of the Great God, give a simple good, not too complicated, novice ah.

The example of the online test, the following errors, but also hope that the great God to help.

09-18 16:45:08.591:e/trace (12014): Error opening Trace file:no such file or directory (2)

09-18 16:45:08.611:W/DALVIKVM (12014): Refusing to reopen boot DEX '/system/framework/hwframework.jar '

09-18 16:45:08.621:W/DALVIKVM (12014): Threadid=1:thread exiting with uncaught exception (group=0x40e13438)

Android Development How to get the path to the external memory card