android how to call in so SDCard file or how to dynamically call the network to download files so

so when you need to download files from the Internet, how to call the so file?
These so consistent file interface.
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JNI understand it? To understand what should know know. . . .
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System.loadLibrary ("readerjni");
Looks like
within the application can only loadSystem.load does not work that way
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Farmer uncle's blog seems to have. . You look for
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Farmers uncle did not find there, from the Internet to find an article
http://stackoverflow.com/questions/6291087/android-load-library-error-failed-to-map-segment

Specific processes:
1, copy the file to the SDCard so the application itself directory / data / data / packageName / custom directory / under
Get custom code to a file directory, copy the program slightly
SDCard

, 
File dir = TestReaderCardActivity.this.getDir ("mylibs", Activity.MODE_PRIVATE); 
File distFile = new File (dir.getAbsolutePath () + File.separator + fileName); 

2, Load / data / data / packageName / custom directory / file under so:

, 
File dir = TestReaderCardActivity.this.getDir ("mylibs", Activity.MODE_PRIVATE); 
System.load (dir.getAbsolutePath () + File.separator + "libReaderLower.so"); 

I hope to encounter the same problem to help


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I also want a friend in SO SD card files to be copied to Data / data / packge / lib / inside
But I do not know how to copy files ............ SO I now use C to copy but did not succeed.
Hope that the landlord can borrow my reference implementation code under wow. 871980431@qq.com

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Data / data / packge / lib /
This folder is not operated ...
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# 4
Can you write clearly point ah