java - permission denied write with USB pen drive -


this androidmanifest.xml

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"     package="com.example.abc2"     android:versioncode="1"     android:versionname="1.1.8" >     <uses-sdk         android:minsdkversion="8"         android:targetsdkversion="18" />      <uses-permission android:name="android.permission.receive_boot_completed" />     <uses-permission android:name="android.permission.disable_keyguard" />     <uses-permission android:name="android.permission.wake_lock" />     <uses-permission android:name="android.permission.read_phone_state"/>     <uses-permission android:name="android.permission.write_external_storage" />      <uses-permission android:name="android.permission.internet" />     <uses-permission android:name="android.permission.access_network_state" />

and m trying copy apps's database usb pendrive, last time using sd card, working fine, after have change sd card path /mnt/sda/sda2 error permission denied, /mnt/sda/sda2 usb pendrive path

this copy file function copy database pendrive 

private void copyfile(string inputpath, string inputfile, string outputpath) {          inputstream in = null;         outputstream out = null;         try {              //create output directory if doesn't exist             file dir = new file (outputpath);              if (!dir.exists())             {                 dir.mkdirs();             }               in = new fileinputstream(inputpath + inputfile);                     out = new fileoutputstream(outputpath + inputfile);              byte[] buffer = new byte[1024];             int read;             while ((read = in.read(buffer)) != -1) {                 out.write(buffer, 0, read);             }             in.close();             in = null;                  // write output file (you have copied file)                 out.flush();             out.close();             out = null;               toast.maketext(ultilityactivity.this, "export successful!", toast.length_short).show();          }  catch (filenotfoundexception fnfe1) {             log.e("tag", fnfe1.getmessage());             toast.maketext(ultilityactivity.this, "export failed", toast.length_short).show();         }                 catch (exception e) {             log.e("tag", e.getmessage());             toast.maketext(ultilityactivity.this, "export failed", toast.length_short).show();         }      }     }

this how call copyfile function

copyfile("/data/data/com.example.abc2/databases/","db_busdata","/mnt/sda/sda2/");

last time copied sd card , code

copyfile("/data/data/com.example.abc2/databases/","db_busdata","/mnt/sdcard/");

copied sd card working, usb pendrive errror :-

03-10 10:58:13.204: d/mainactivity(1832): open failed: eacces (permission denied) 03-10 10:58:13.204: d/mainactivity(1832): java.io.ioexception: open failed: eacces (permission denied)

it need mount usb drive? can mount in programmatically ? how? please give me example?

in android os, usb pendrive know sd card,
but, permission in androidmanifest.xml need declare different permission, usb external storage need media enable permission below :-

<uses-permission android:name="android.permission.write_media_storage" />

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