Android File Manager with Navigation Drawer

Question 1

Solved it. I used ListFragment for FileChooser class and removed the inner class. Also used another listview.xml. Here is the modified code

public class FileChooser extends ListFragment{

    private File currentDir;
    private FileArrayAdapter adapter;

    public FileChooser() {};

    public static ListFragment newInstance(Context context) {
        FileChooser f = new FileChooser();

        return f;
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.activity_main, container, false);
       currentDir = new File(Environment.getExternalStorageDirectory().getPath());

        fill(currentDir);
        return rootView;
    }
    /*
     * Method to fill the current layout with files and folders from the external directory
     * 
     * @params: Path for the SD Card
     */

    void fill(File f)
    {
        File[]dirs = f.listFiles(); 
         //this.setTitle(f.getName());
         List<Item>dir = new ArrayList<Item>();
         List<Item>fls = new ArrayList<Item>();
         try{
             for(File ff: dirs)
             { 
                Date lastModDate = new Date(ff.lastModified()); 
                DateFormat formater = DateFormat.getDateTimeInstance();
                String date_modify = formater.format(lastModDate);
                if(ff.isDirectory()){


                    File[] fbuf = ff.listFiles(); 
                    int buf = 0;
                    if(fbuf != null){ 
                        buf = fbuf.length;
                    } 
                    else buf = 0; 
                    String num_item = String.valueOf(buf);
                    if(buf == 0) num_item = num_item + " item";
                    else num_item = num_item + " items";

                    //String formated = lastModDate.toString();
                    dir.add(new Item(ff.getName(),num_item,date_modify,ff.getAbsolutePath(),"directory_icon")); 
                }
                else
                {

                    fls.add(new Item(ff.getName(),ff.length() + " Byte", date_modify, ff.getAbsolutePath(),"file_icon"));
                }
             }
         }catch(Exception e)
         {    

         }
         Collections.sort(dir);
         Collections.sort(fls);
         dir.addAll(fls);
         if(!f.getName().equalsIgnoreCase(Environment.getExternalStorageDirectory().getName()))
             dir.add(0,new Item("..","Parent Directory","",f.getParent(),"directory_up"));
         adapter = new FileArrayAdapter(getActivity(),R.layout.file_view,dir);
         this.setListAdapter(adapter); 
    }
    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        super.onListItemClick(l, v, position, id);
        Item o = adapter.getItem(position);
        if(o.getImage().equalsIgnoreCase("directory_icon")||o.getImage().equalsIgnoreCase("directory_up")){
                currentDir = new File(o.getPath());
                fill(currentDir);
        }
        else
        {
            onFileClick(o);
        }
    }
    private void onFileClick(Item o)
    {
        Toast.makeText(getActivity(), "Folder Clicked: "+ currentDir, Toast.LENGTH_SHORT).show();
    }
}

Question 2

You can use my File Manager Code. I have used a simple dialog:-

package com.wysiwyg.main;

import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;

import com.example.dev_task_197_keyboard_accesory.R;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.TextView;

public class FileExplore extends Activity {

    // Stores names of traversed directories
    ArrayList<String> str = new ArrayList<String>();

    // Check if the first level of the directory structure is the one showing
    private Boolean firstLvl = true;

    private static final String TAG = "F_PATH";

    private Item[] fileList;
    private File path = new File(Environment.getExternalStorageDirectory() + "");
    private String chosenFile;
    private static final int DIALOG_LOAD_FILE = 1000;

    ListAdapter adapter;

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        loadFileList();

        showDialog(DIALOG_LOAD_FILE);
        Log.d(TAG, path.getAbsolutePath());

    }

    private void loadFileList() {
        try {
            path.mkdirs();
        } catch (SecurityException e) {
            Log.e(TAG, "unable to write on the sd card ");
        }

        // Checks whether path exists
        if (path.exists()) {
            FilenameFilter filter = new FilenameFilter() {
                @Override
                public boolean accept(File dir, String filename) {
                    File sel = new File(dir, filename);
                    // Filters based on whether the file is hidden or not
                    return (sel.isFile() || sel.isDirectory())
                            && !sel.isHidden();

                }
            };

            String[] fList = path.list(filter);
            fileList = new Item[fList.length];
            for (int i = 0; i < fList.length; i++) {
                fileList[i] = new Item(fList[i], R.drawable.file_icon);

                // Convert into file path
                File sel = new File(path, fList[i]);

                // Set drawables
                if (sel.isDirectory()) {
                    fileList[i].icon = R.drawable.directory_icon;
                    Log.d("DIRECTORY", fileList[i].file);
                } else {
                    Log.d("FILE", fileList[i].file);
                }
            }

            if (!firstLvl) {
                Item temp[] = new Item[fileList.length + 1];
                for (int i = 0; i < fileList.length; i++) {
                    temp[i + 1] = fileList[i];
                }
                temp[0] = new Item("Up", R.drawable.directory_up);
                fileList = temp;
            }
        } else {
            Log.e(TAG, "path does not exist");
        }

        adapter = new ArrayAdapter<Item>(this,
                android.R.layout.select_dialog_item, android.R.id.text1,
                fileList) {
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                // creates view
                View view = super.getView(position, convertView, parent);
                TextView textView = (TextView) view
                        .findViewById(android.R.id.text1);

                // put the image on the text view
                textView.setCompoundDrawablesWithIntrinsicBounds(
                        fileList[position].icon, 0, 0, 0);

                // add margin between image and text (support various screen
                // densities)
                int dp5 = (int) (5 * getResources().getDisplayMetrics().density + 0.5f);
                textView.setCompoundDrawablePadding(dp5);

                return view;
            }
        };

    }

    private class Item {
        public String file;
        public int icon;

        public Item(String file, Integer icon) {
            this.file = file;
            this.icon = icon;
        }

        @Override
        public String toString() {
            return file;
        }
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        Dialog dialog = null;
        AlertDialog.Builder builder = new Builder(this);

        if (fileList == null) {
            Log.e(TAG, "No files loaded");
            dialog = builder.create();
            return dialog;
        }

        switch (id) {
        case DIALOG_LOAD_FILE:
            builder.setTitle("Choose your file");
            builder.setAdapter(adapter, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    chosenFile = fileList[which].file;
                    File sel = new File(path + "/" + chosenFile);
                    if (sel.isDirectory()) {
                        firstLvl = false;

                        // Adds chosen directory to list
                        str.add(chosenFile);
                        fileList = null;
                        path = new File(sel + "");

                        loadFileList();

                        removeDialog(DIALOG_LOAD_FILE);
                        showDialog(DIALOG_LOAD_FILE);
                        Log.d(TAG, path.getAbsolutePath());

                    }

                    // Checks if 'up' was clicked
                    else if (chosenFile.equalsIgnoreCase("up") && !sel.exists()) {

                        // present directory removed from list
                        String s = str.remove(str.size() - 1);

                        // path modified to exclude present directory
                        path = new File(path.toString().substring(0,
                                path.toString().lastIndexOf(s)));
                        fileList = null;

                        // if there are no more directories in the list, then
                        // its the first level
                        if (str.isEmpty()) {
                            firstLvl = true;
                        }
                        loadFileList();

                        removeDialog(DIALOG_LOAD_FILE);
                        showDialog(DIALOG_LOAD_FILE);
                        Log.d(TAG, path.getAbsolutePath());

                    }
                    // File picked
                    else {
                        Intent returnIntent = new Intent();
                        returnIntent.putExtra("file", path + "/" + chosenFile);
                        setResult(RESULT_OK,returnIntent);        
                        finish();
                        // Perform action with file picked
                    }

                }
            });
            break;
        }
        dialog = builder.show();
        return dialog;
    }

}