
向SD卡写入文件失败的话,有一个可能的原因是在AndroidManifest.xml文件里没有声明对应的权限。
http://stackoverflow.com/questions/4580683/writing-text-file-to-sd-card-fails
亮点:
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      3 down vote  | 
    
      I just found out that in my case, i was missing adding <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> in Manifest file. Cheers, wahib  | 
   
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