/android/export-contacts

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2 by edam
- added file chooser
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/*
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 * FileChooser.java
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 *
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 * Copyright (C) 2010 Tim Marston <edam@waxworlds.org>
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 *
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 * This file is part of the Export Contacts program (hereafter referred
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 * to as "this program"). For more information, see
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 * http://www.waxworlds.org/edam/software/android/export-contacts
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package org.waxworlds.edam.exportcontacts;
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import java.io.File;
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import java.io.FileFilter;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Comparator;
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import android.app.AlertDialog;
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import android.app.Dialog;
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import android.content.Context;
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import android.content.DialogInterface;
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import android.os.Environment;
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import android.view.LayoutInflater;
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import android.view.View;
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import android.view.View.OnClickListener;
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import android.view.ViewGroup;
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import android.widget.AdapterView;
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import android.widget.AdapterView.OnItemClickListener;
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import android.widget.ArrayAdapter;
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import android.widget.Button;
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import android.widget.ImageView;
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import android.widget.ListView;
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import android.widget.TextView;
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public class FileChooser
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{
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	// pick an existing directory
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	public final static int MODE_DIR = 1;
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	// pick an existing file
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	public final static int MODE_FILE = 2;
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	private Dialog _dialog;
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	// mode
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	private int _mode = MODE_DIR;
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	// ok was pressed
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	boolean _ok = false;
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	// working path
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	private String _path;
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	// selected filename
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	private String _filename;
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	// enforce extension (in file-mode)
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	private String[] _extensions;
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	// path to secretly prefix all paths with
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	private String _path_prefix = "";
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	private Context _context;
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	private ArrayList< RowItem > _items;
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	private DialogInterface.OnDismissListener _on_dismiss_listener;
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	// class that represents a row in the list
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	private class RowItem implements Comparable< RowItem >
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	{
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		private String _name;
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		private boolean _directory;
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		public RowItem( String name, boolean directory )
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		{
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			_name = name;
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			_directory = directory;
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		}
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		public String getName()
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		{
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			return _name;
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		}
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		public boolean isDirectory()
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		{
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			return _directory;
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		}
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		@Override
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		public int compareTo( RowItem that )
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		{
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			if( this._directory && !that._directory )
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				return -1;
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			else if( !this._directory && that._directory )
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				return 1;
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			else
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				return this._name.compareToIgnoreCase( that._name );
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		}
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	}
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	// class to manage our list of RowItems
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	private class RowItemAdapter extends ArrayAdapter< RowItem >
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	{
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		private ArrayList< RowItem > _items;
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		public RowItemAdapter( Context context, int textview_resource_id,
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			ArrayList< RowItem > items )
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		{
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			super( context, textview_resource_id, items );
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			_items = items;
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		}
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		@Override
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		public View getView( int position, View convert_view, ViewGroup parent )
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		{
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			View view = convert_view;
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			if( view == null ) {
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				LayoutInflater factory = LayoutInflater.from( _context );
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				view = factory.inflate(  R.layout.filechooser_row, null );
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			}
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			RowItem rowitem = _items.get( position );
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			if( rowitem != null ) {
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				( (TextView)view.findViewById( R.id.name ) )
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					.setText( rowitem.getName() );
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				( (ImageView)view.findViewById( R.id.icon ) ).setVisibility(
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					rowitem.isDirectory()? View.VISIBLE : View.GONE );
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			}
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			return view;
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		}
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	}
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	@SuppressWarnings( "serial" )
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	class InvalidPathPrefixException extends RuntimeException
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	{
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	}
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	// constructor
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	public FileChooser( Context context )
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	{
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		_context = context;
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	}
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	public void setMode( int mode )
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	{
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		_mode = mode;
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	}
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	public void setPath( String path )
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	{
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		_path = cleanUpPath( path );
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		File file = new File( _path_prefix + path.trim() );
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		// path and filename
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		if( file.isFile() ) {
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			_path = _path.substring( 0, _path.length() - 1 );
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			_filename = _path.substring( _path.lastIndexOf( '/' ) + 1 );
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			_path = _path.substring( 0, _path.length() - _filename.length() );
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		}
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		// else, treat as just a path
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		else
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			_filename = "";
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	}
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	public void setExtensions( String[] extensions )
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	{
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		_extensions = extensions;
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	}
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	// set dismiss listener
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	public void setDismissListener(
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		DialogInterface.OnDismissListener on_dismiss_listener )
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	{
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		_on_dismiss_listener = on_dismiss_listener;
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	}
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	// set the path prefix
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	public void setPathPrefix( String path_prefix )
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	{
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		// set to cleaned-up path, with trailaing '/' removed so that it can be
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		// trivially pre-pended to a cleaned-up path
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		_path_prefix = cleanUpPath( path_prefix );
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		_path_prefix = _path_prefix.substring( 0, _path_prefix.length() - 1 );
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	}
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	public boolean getOk()
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	{
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		return _ok;
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	}
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	public String getPath()
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	{
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		return _path + _filename;
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	}
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	public Dialog onCreateDialog()
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	{
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		// custom layout in an AlertDialog
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		LayoutInflater factory = LayoutInflater.from( _context );
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		final View dialogView = factory.inflate(
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			R.layout.filechooser, null );
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		// wire up buttons
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		( (Button)dialogView.findViewById( R.id.ok ) )
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			.setOnClickListener( _fileChooserButtonListener );
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		( (ListView)dialogView.findViewById( R.id.list ) )
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			.setOnItemClickListener( _fileChooserItemClickListener );
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		// return dialog
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		Dialog dialog = new AlertDialog.Builder( _context )
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			.setTitle( " " )
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			.setView( dialogView )
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			.create();
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		dialog.setOnDismissListener( _on_dismiss_listener );
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		return dialog;
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	}
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	private OnClickListener _fileChooserButtonListener = new OnClickListener() {
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		public void onClick( View view )
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		{
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			switch( view.getId() )
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			{
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			case R.id.ok:
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				// close dialog and free (don't keep a reference)
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				_ok = true;
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				_dialog.dismiss();
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				break;
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			}
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		}
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	};
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	private OnItemClickListener _fileChooserItemClickListener = new OnItemClickListener() {
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		public void onItemClick( AdapterView< ? > adapterView, View view, int position, long id )
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		{
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			RowItem rowitem = _items.get( position );
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			// handle directory changes
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			if( rowitem.isDirectory() )
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			{
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				String dirname = rowitem.getName();
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				if( dirname.equals( ".." ) )
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					strtipLastFilepartFromPath();
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				else
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					_path += dirname + "/";
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				_filename = "";
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				updateList();
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			}
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			// handle file selections
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			else
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			{
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				_filename = rowitem.getName();
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				updateCurrentSelection();
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			}
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		}
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	};
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	public void onPrepareDialog( Context context, Dialog dialog )
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	{
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		// set up reference to dialog
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		_dialog = dialog;
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		_context = context;
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		// reset "ok"
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		_ok = false;
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		// pick text based on mode
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		int title = 0, current = 0;
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		switch( _mode ) {
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		case MODE_DIR:
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			title = R.string.filechooser_title_dir;
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			current = R.string.filechooser_current_dir;
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			break;
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		case MODE_FILE:
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			title = R.string.filechooser_title_file;
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			current = R.string.filechooser_current_file;
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			break;
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		}
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		dialog.setTitle( title );
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		( (TextView)dialog.findViewById( R.id.current ) )
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			.setText( _context.getString(  current ) );
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		// clear filename in directory mode
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		if( _mode == MODE_DIR )
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			_filename = "";
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		// set root path icon
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		( (ImageView)_dialog.findViewById( R.id.icon ) )
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			.setImageResource( pathIcon( cleanUpPath( _path_prefix ) ) );
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		// setup current-path-specific stuff
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		updateList();
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	}
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	public static String cleanUpPath( String path )
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	{
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		path = path.trim();
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		// ensure it starts and ends in a '/'
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		if( !path.startsWith( "/" ) ) path = "/" + path;
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		if( !path.endsWith( "/" ) ) path += "/";
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		return path;
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	}
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	public static int pathIcon( String path )
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	{
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		// get sdcard path
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		String sdcard_path;
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		try {
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			sdcard_path = Environment.getExternalStorageDirectory()
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				.getCanonicalPath();
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			if( sdcard_path.charAt( sdcard_path.length() - 1 ) != '/' )
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				sdcard_path += "/";
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		}
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		catch( IOException e ) {
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			sdcard_path = null;
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		}
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		// special paths
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		if( sdcard_path != null && path.equals( sdcard_path ) )
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			return R.drawable.sdcard;
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		// default
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		return R.drawable.directory;
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	}
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	public String prettyPrint( String full_path, boolean return_full )
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	{
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		String path = full_path;
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		// get sdcard path
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		String sdcard_path;
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		try {
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			sdcard_path = Environment.getExternalStorageDirectory()
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				.getCanonicalPath();
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			if( sdcard_path.charAt( sdcard_path.length() - 1 ) != '/' )
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				sdcard_path += "/";
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		}
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		catch( IOException e ) {
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			sdcard_path = null;
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		}
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		// special names
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		if( sdcard_path != null && path.equals( sdcard_path ) )
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			return " " + _context.getString( R.string.filechooser_path_sdcard );
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		// remove prefix, if present
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		if( path.startsWith( _path_prefix + "/" ) )
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			path = path.substring( _path_prefix.length() );
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		// unless path is "/", strip trailing "/".
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		if( path.length() > 1 && path.endsWith( "/" ) )
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			path = path.substring( 0, path.length() - 1 );
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		// if full path not required, strip off preceding directories
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		if( !return_full ) {
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			int idx = path.lastIndexOf( "/" );
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			if( idx != -1 ) path = path.substring( idx + 1 );
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		}
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		return path;
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	}
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	protected void strtipLastFilepartFromPath()
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	{
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		int at = _path.lastIndexOf( '/', _path.length() - 2 );
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		if( at != -1 ) _path = _path.substring( 0, at + 1 );
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	}
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	protected void updateList()
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	{
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		// reset item list
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		_items = new ArrayList< RowItem >();
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		// open directory (and ensure _path is a directory)
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		File dir = new File( _path_prefix + _path );
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		while( !dir.isDirectory() ) {
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			if( _path == "/" )
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				throw new InvalidPathPrefixException();
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			strtipLastFilepartFromPath();
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			dir = new File( _path_prefix + _path );
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		}
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		// add ".."?
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		if( !_path.equals( "/" ) )
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			_items.add( new RowItem( "..", true ) );
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		// get directories
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		class DirFilter implements FileFilter {
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			public boolean accept( File file ) {
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				return file.isDirectory() && file.getName().charAt( 0 ) != '.';
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			}
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		}
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		File[] files = dir.listFiles( new DirFilter() );
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		if( files != null )
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			for( int i = 0; i < files.length; i++ )
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				_items.add( new RowItem( files[ i ].getName(), true ) );
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		// get files
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		if( _mode == MODE_FILE )
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		{
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			class VCardFilter implements FileFilter {
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				public boolean accept( File file ) {
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					if( file.isDirectory() || file.getName().startsWith( "." ) )
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						return false;
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					String filename = file.getName().toLowerCase();
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					for( int i = 0; i < _extensions.length; i++ )
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						if( filename.endsWith( "." + _extensions[ i ] ) )
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							return true;
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					return false;
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				}
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			}
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			files = dir.listFiles( new VCardFilter() );
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			if( files != null )
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				for( int i = 0; i < files.length; i++ )
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					_items.add( new RowItem( files[ i ].getName(), false ) );
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		}
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		// sort
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		class RowItemSorter implements Comparator< RowItem > {
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			@Override
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			public int compare( RowItem lhs, RowItem rhs ) {
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				return lhs.compareTo( rhs );
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			}
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		}
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		Collections.sort( _items, new RowItemSorter() );
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		// setup directory list
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		( (ListView)_dialog.findViewById( R.id.list ) ).setAdapter(
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			new RowItemAdapter( _context, R.layout.filechooser_row,
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				_items ) );
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		updateCurrentSelection();
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	}
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	private void updateCurrentSelection()
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	{
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		// set current path
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		( (TextView)_dialog.findViewById( R.id.path ) ).setText(
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			prettyPrint( _path_prefix + _path + _filename, true ) );
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		// enable/disable ok button
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		if( _mode == MODE_FILE )
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			_dialog.findViewById( R.id.ok ).setEnabled( _filename != "" );
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		else
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			_dialog.findViewById( R.id.ok ).setEnabled( true );
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	}
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}