java - Android loading files into array NullPointerException -


hi trying load set of "list" string array, , list .txt documents , want use names of files list name on display, therefore need of files in folder had created named "lists" , display them arrayadapter.

private string[] getlistnames() {     //generates file containing list names     file file = new file(this.getfilesdir() +file.separator +"lists");      system.out.println(file.getabsolutepath());     file lists[] = file.listfiles();     string names[] = {};       if(lists.length >0){      for(int = 0; < lists.length; ++){         names[i] = lists[i].getname();     }     }else{         names[0] = "create new list";     }

line of code in question according stacktrace (line 108)

if(lists.length >0){

stacktrace

03-25 04:37:16.981: e/androidruntime(2099): caused by: java.lang.nullpointerexception 03-25 04:37:16.981: e/androidruntime(2099):     @ dev.shaw.myshoppingplanner.list_activity.getlistnames(list_activity.java:108) 

private list<string> mylist = new arraylist<string>();     string root_sd = environment.getexternalstoragedirectory().tostring(); file = new file( root_sd + "/lists" ) ;        file list[] = file.listfiles();  for( int i=0; i< list.length; i++) {         mylist.add( list[i].getname() ); }

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