Navigation in files/directory

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package com.AndroidListFiles;    import java.io.File; import java.util.ArrayList; import java.util.List;    import android.app.ListActivity; import android.os.Bundle; import android.os.Environment; import android.view.View; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.Toast;    public class AndroidListFilesActivity extends ListActivity {    private List<string> fileList = new ArrayList<string>();       @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                 File root = new File(Environment          .getExternalStorageDirectory()          .getAbsolutePath());        ListDir(root);       }         @Override protected void onListItemClick(ListView l, View v, int position, long id) {  // TODO Auto-generated method stub     File selected = new File(fileList.get(position));     if(selected.isDirectory()){      ListDir(selected);     }else {      Toast.makeText(AndroidListFilesActivity.this,        selected.toString() + " selected",        Toast.LENGTH_LONG).show();     } }    void ListDir(File f){     File[] files = f.listFiles();     fileList.clear();     for (File file : files){      fileList.add(file.getPath());     }           ArrayAdapter<string> directoryList     = new ArrayAdapter<string>(this,       android.R.layout.simple_list_item_1, fileList);     setListAdapter(directoryList);    }    } </string></string></string></string>

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