android - download ftp files to sd card and show in a list view onclcik -

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I downloaded the files from FTP and saved the SD card. So I click on SD card with listview. But this is not working for me.

This is my code 

  public file f; Crate on public void (bundle extractor) {super. Cottage SetContentView (R.layout.activity_main); Lv = (ListView) findViewById (R.id.list); New Ftpclient () Executed (); Lv.setOnItemClickListener (New OnItemClickListener) {public void onItemClick (adapter view   
 NPE in this line displays  
  string uri = f.toString ();   
 The six Thanks always to thank you   
 
 
 Try with LV inside Lv.setAdapter (arrayAdapter) PostExecute    after invalid ()

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