FileUtil.java

package com.android.FileBrowser;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.DecimalFormat;
import android.os.Environment;

/** �ļ��������� **/
public class FileUtil {

	/** ��ȡSD·�� **/
	public static String getSDPath() {
		// �ж�sd���Ƿ����
		if (Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) {
			File sdDir = Environment.getExternalStorageDirectory();// ��ȡ��Ŀ¼
			return sdDir.getPath();
		}
		return "/sdcard";
	}

	/** ��ȡ�ļ���Ϣ **/
	public static FileInfo getFileInfo(File f) {
		FileInfo info = new FileInfo();
		info.Name = f.getName();
		info.IsDirectory = f.isDirectory();
		calcFileContent(info, f);
		return info;
	}

	/** �����ļ����� **/
	private static void calcFileContent(FileInfo info, File f) {
		if (f.isFile()) {
			info.Size += f.length();
		}
		if (f.isDirectory()) {
			File[] files = f.listFiles();
			if (files != null && files.length > 0) {
				for (int i = 0; i < files.length; ++i) {
					File tmp = files[i];
					if (tmp.isDirectory()) {
						info.FolderCount++;
					} else if (tmp.isFile()) {
						info.FileCount++;
					}
					if (info.FileCount + info.FolderCount >= 10000) { // ����һ�򲻼���
						break;
					}
					calcFileContent(info, tmp);
				}
			}
		}
	}

	/** ת���ļ���С **/
	public static String formetFileSize(long fileS) {
		DecimalFormat df = new DecimalFormat("#.00");
		String fileSizeString = "";
		if (fileS < 1024) {
			fileSizeString = fileS + " B";
		} else if (fileS < 1048576) {
			fileSizeString = df.format((double) fileS / 1024) + " K";
		} else if (fileS < 1073741824) {
			fileSizeString = df.format((double) fileS / 1048576) + " M";
		} else {
			fileSizeString = df.format((double) fileS / 1073741824) + " G";
		}
		return fileSizeString;
	}

	/** �ϲ�·�� **/
	public static String combinPath(String path, String fileName) {
		return path + (path.endsWith(File.separator) ? "" : File.separator) + fileName;
	}

	/** �����ļ� **/
	public static boolean copyFile(File src, File tar) throws Exception {
		if (src.isFile()) {
			InputStream is = new FileInputStream(src);
			OutputStream op = new FileOutputStream(tar);
			BufferedInputStream bis = new BufferedInputStream(is);
			BufferedOutputStream bos = new BufferedOutputStream(op);
			byte[] bt = new byte[1024 * 8];
			int len = bis.read(bt);
			while (len != -1) {
				bos.write(bt, 0, len);
				len = bis.read(bt);
			}
			bis.close();
			bos.close();
		}
		if (src.isDirectory()) {
			File[] f = src.listFiles();
			tar.mkdir();
			for (int i = 0; i < f.length; i++) {
				copyFile(f[i].getAbsoluteFile(), new File(tar.getAbsoluteFile() + File.separator
						+ f[i].getName()));
			}
		}
		return true;
	}

	/** �ƶ��ļ� **/
	public static boolean moveFile(File src, File tar) throws Exception {
		if (copyFile(src, tar)) {
			deleteFile(src);
			return true;
		}
		return false;
	}

	/** ɾ���ļ� **/
	public static void deleteFile(File f) {
		if (f.isDirectory()) {
			File[] files = f.listFiles();
			if (files != null && files.length > 0) {
				for (int i = 0; i < files.length; ++i) {
					deleteFile(files[i]);
				}
			}
		}
		f.delete();
	}

	/** ��ȡMIME���� **/
	public static String getMIMEType(String name) {
		String type = "";
		String end = name.substring(name.lastIndexOf(".") + 1, name.length()).toLowerCase();
		if (end.equals("apk")) {
			return "application/vnd.android.package-archive";
		} else if (end.equals("mp4") || end.equals("avi") || end.equals("3gp")
				|| end.equals("rmvb")) {
			type = "video";
		} else if (end.equals("m4a") || end.equals("mp3") || end.equals("mid") || end.equals("xmf")
				|| end.equals("ogg") || end.equals("wav")) {
			type = "audio";
		} else if (end.equals("jpg") || end.equals("gif") || end.equals("png")
				|| end.equals("jpeg") || end.equals("bmp")) {
			type = "image";
		} else if (end.equals("txt") || end.equals("log")) {
			type = "text";
		} else {
			type = "*";
		}
		type += "/*";
		return type;
	}
}