filesystems - Java and android file browser issue -

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im starting work honeycomb, , im trying make simple fragmented layout list of file on left side, , details of file on right (when file selected). well, going until tried list files, , "/" slash, , thats it. nothing else. set log track number of files in directory im in, , sees 26, wont list them. heres code

package com.bv.dual_fragments;   import java.io.file; import java.util.arraylist; import java.util.list;  import android.app.alertdialog; import android.app.fragment; import android.app.listfragment; import android.content.dialoginterface; import android.content.dialoginterface.onclicklistener; import android.content.intent; import android.net.uri; import android.os.bundle; import android.util.log; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.arrayadapter; import android.widget.textview;  public class fragment_one extends listfragment{ private file currentdirectory = new file("/"); private list<string> directoryenteries = new arraylist<string>();  public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     super.oncreate(savedinstancestate);      return inflater.inflate(r.layout.fragment_one,container, false); } @override public void onactivitycreated(bundle savedinstancestate) {     //inflate layout fragment     super.oncreate(savedinstancestate);      //browse root directory     browseto(new file("/")); } private void uponelevel() {     if (this.currentdirectory.getparent() !=null) {         this.browseto(this.currentdirectory.getparentfile());     } } private void browseto(final file adirectory) {     //if want browse directory     if (adirectory.isdirectory()){         this.currentdirectory = adirectory;         integer filelength = adirectory.listfiles().length;         log.i("file",filelength.tostring() );         file[] files = new file[filelength];          (file file : files) {             log.i("file", file.getabsolutepath());         }         fill(adirectory.listfiles());          //set titlemanger text         textview titlemanager = (textview)getview().findviewbyid(r.id.titlemanager);         titlemanager.settext(adirectory.getabsolutepath());     } else {         //if want o open file, show dialog:         //listener when yes button clicked         onclicklistener okbuttonlistener = new onclicklistener() {             public void onclick(dialoginterface arg0, int arg1) {                 //intent navigate file                 intent = new intent(android.content.intent.action_view, uri.parse("file://" + adirectory.getabsolutepath()));                 startactivity(i);             }         };         onclicklistener cancelbuttonlistener = new onclicklistener() {             public void onclick(dialoginterface arg0, int arg1) {              }         };         //create dialog         new alertdialog.builder(getactivity())         .settitle("dialog title")         .setmessage("file name " + adirectory.getname() + "?")         .setpositivebutton("ok", okbuttonlistener)         .setnegativebutton("no", cancelbuttonlistener)         .show();     } } private void fill(file[] files) {     //clear list     this.directoryenteries.clear();      if (this.currentdirectory.getparent() != null)         this.directoryenteries.add("..");      //add every file in list     (file file : files) {         this.directoryenteries.add(file.getabsolutepath());     }     //create array adapter show     arrayadapter<string> directorylist = new arrayadapter<string>(getactivity(), r.layout.row, directoryenteries);     this.setlistadapter(directorylist); }  }

so, runs, got fragments layout,but wont list files. appreciated. oh, when try put in loop add each name of files log, gives nullpoint exception

edit: think have chased down resource file row using, r.layout.row, dont see whats wrong. heres layout file

<?xml version="1.0" encoding="utf-8"?> <textview     xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="40sp"     android:padding="5dip"     android:background="@color/white" android:gravity="center_vertical"/>

add follow after call //browse root directory browseto(new file("/"));

    listview lv = getlistview();     lv.setchoicemode(listview.choice_mode_single);     lv.setcachecolorhint(color.transparent);

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