android - java.io.FileNotFoundException: images -

i want move images stored in assets folder sd card....

private void copyassets() {     assetmanager assetmanager = getassets();     string[] files = null;     try {         files = assetmanager.list("");     } catch (ioexception e) {         log.e("tag", "failed asset file list.", e);     }     for(string filename : files) {         inputstream in = null;         outputstream out = null;         try {           in = assetmanager.open(filename);           file outfile = new file(getexternalfilesdir(null), filename);           out = new fileoutputstream(outfile);           copyfile(in, out);           in.close();           in = null;           out.flush();           out.close();           out = null;         } catch(ioexception e) {             log.e("tag", "failed copy asset file: " + filename, e);         }            } } private void copyfile(inputstream in, outputstream out) throws ioexception {     byte[] buffer = new byte[1024];     int read;     while((read = in.read(buffer)) != -1){       out.write(buffer, 0, read);     } } 

this standard code i've used, , have made changes in manifest for

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

i have called above function in oncreate method of java class i'm not getting option of "move sd card" in manage applications, nor files getting copied .

instead showing error : 07-11 16:59:29.042: e/tag(4997): java.io.filenotfoundexception: images