Android Question How to test about EncodeBase64_DecodeBase64_WithStringUtils?

Olaan

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Hi all,
I 've learned about this. I've tried to do myself,but I have error. Please explain to me ,or show the corrected for me.
Thank you in advance
 

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I test only the emulator,I don't have sdcard. How should I edit the coding?
 

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OK I have done,but I would like to know that how is it useful or better than the simple strategy. I think that I could do the simple strategy.
 
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