FileBrowser.java

package com.chinaece.gaia.util;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Stack;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;

import com.chinaece.gaia.R;

public class FileBrowser extends ListView implements
		android.widget.AdapterView.OnItemClickListener,android.widget.AdapterView.OnItemLongClickListener
{
	private String sdcardDirectory;
	private List<File> fileList = new ArrayList<File>();
	private Stack<String> dirStack = new Stack<String>();
	private FileListAdapter fileListAdapter;
	private OnFileBrowserListener onFileBrowserListener;
	private int folderImageResId;
	private int otherFileImageResId;
	private Map<String, Integer> fileImageResIdMap = new HashMap<String, Integer>();
	private boolean onlyFolder = false;

	public FileBrowser(Context context, AttributeSet attrs) throws IOException
	{
		
		super(context, attrs);
		sdcardDirectory = android.os.Environment.getExternalStorageDirectory()
				.toString()+"/ece";
		File file = new File(sdcardDirectory);
		if(!file.exists())
			file.mkdirs();
		setOnItemClickListener(this);
		setOnItemLongClickListener(this);
		setBackgroundColor(android.graphics.Color.BLACK);

		folderImageResId = R.drawable.folder;
		otherFileImageResId = R.drawable.other;
		onlyFolder = false;
		
		dirStack.push(sdcardDirectory);
		refreshFiles();
		
		fileListAdapter = new FileListAdapter(getContext(), 0);
		setAdapter(fileListAdapter);

	}

	public void refreshFiles()
	{
		fileList.clear();
		String currentPath = getCurrentPath();
		File[] files = new File(currentPath).listFiles();
		if (dirStack.size() > 1)
			fileList.add(null);
		for (File file : files)
		{
			if (onlyFolder)
			{
				if (file.isDirectory())
					fileList.add(file);
			}
			else
			{
				fileList.add(file);
			}
		}
	}

	private String getCurrentPath()
	{
		String path = "";
		for (String dir : dirStack)
		{
			path += dir + "/";
		}
		path = path.substring(0, path.length() - 1);
		return path;
	}

	private String getExtName(String filename)
	{

		int position = filename.lastIndexOf(".");
		if (position >= 0)
			return filename.substring(position + 1);
		else
			return "";
	}
	
	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position,
			long id)
	{
		if (fileList.get(position) == null)
		{
			dirStack.pop();
			if (onFileBrowserListener != null)
			{
				onFileBrowserListener.onDirItemClick(getCurrentPath());
			}
		}
		else if (fileList.get(position).isDirectory())
		{
			dirStack.push(fileList.get(position).getName());
			if (onFileBrowserListener != null)
			{
				onFileBrowserListener.onDirItemClick(getCurrentPath());
			}
		}
		else
		{
			if (onFileBrowserListener != null)
			{
				String filename = sdcardDirectory + "/"
						+ fileList.get(position).getName();
				onFileBrowserListener.onFileItemClick(filename);
			}
		}

	}
	
	@Override
	public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int position,
			long arg3) {
		if (fileList.get(position) == null)
		{
			dirStack.pop();
			if (onFileBrowserListener != null)
			{
				onFileBrowserListener.onDirItemClick(getCurrentPath());
			}
		}
		else if (fileList.get(position).isDirectory())
		{
			dirStack.push(fileList.get(position).getName());
			if (onFileBrowserListener != null)
			{
				onFileBrowserListener.onDirItemClick(getCurrentPath());
			}
		}
		else
		{
			if (onFileBrowserListener != null)
			{
				String filename = sdcardDirectory + "/"
						+ fileList.get(position).getName();
				onFileBrowserListener.onFlieLongItemClick(filename);
			}
		}
		return true;
	}

	private class FileListAdapter extends ArrayAdapter<File>
	{
		private Context context;
		
		public FileListAdapter(Context context, int textViewResourceId) {
			super(context, textViewResourceId);
			this.context = context;
		}
		
		@Override
		public int getCount()
		{
			return fileList.size();
		}

		@Override
		public File getItem(int position)
		{
			return fileList.get(position);
		}

		@Override
		public long getItemId(int position)
		{
			return position;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent)
		{
			LinearLayout fileLayout = new LinearLayout(context);
			fileLayout.setLayoutParams(new LayoutParams(
					LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
			fileLayout.setOrientation(LinearLayout.HORIZONTAL);
			fileLayout.setPadding(5, 10, 0, 10);
			ImageView ivFile = new ImageView(context);
			ivFile.setLayoutParams(new LayoutParams(48, 48));
			TextView tvFile = new TextView(context);
			tvFile.setTextSize(25);
			tvFile.setTextColor(android.graphics.Color.WHITE);
			tvFile.setTextAppearance(context,
					android.R.style.TextAppearance_Large);

			tvFile.setPadding(5, 5, 0, 0);
			if (fileList.get(position) == null)
			{

				if (folderImageResId > 0)
					ivFile.setImageResource(folderImageResId);
				tvFile.setText(". .");
			}
			else if (fileList.get(position).isDirectory())
			{
				if (folderImageResId > 0)
					ivFile.setImageResource(folderImageResId);
				tvFile.setText(fileList.get(position).getName());
			}
			else
			{
				tvFile.setText(fileList.get(position).getName());
				Integer resId = fileImageResIdMap.get(getExtName(fileList.get(
						position).getName()).toLowerCase());
				int fileImageResId = 0;
				if (resId != null)
				{
					if (resId > 0)
					{
						fileImageResId = resId;
					}

				}
				if (fileImageResId > 0)
					ivFile.setImageResource(fileImageResId);
				else if (otherFileImageResId > 0)
					ivFile.setImageResource(otherFileImageResId);
			}

			tvFile.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
					LayoutParams.WRAP_CONTENT));
			fileLayout.addView(ivFile);
			fileLayout.addView(tvFile);
			return fileLayout;
		}
		
		
	}

	public void setOnFileBrowserListener(OnFileBrowserListener listener)
	{
		this.onFileBrowserListener = listener;
	}
	
	
}