FileUtil.java

package com.sogouchat.os;

import java.io.File;
import java.sql.Timestamp;
import java.text.DecimalFormat;

import android.content.Context;
import android.os.Environment;
import android.util.Log;

public class FileUtil {
	public static String getFilName(String url)
	{
		int lastIndexStart = url.lastIndexOf("/");
		if(lastIndexStart!=-1)
		{
			return url.substring(lastIndexStart+1, url.length());
		}else{
			return new Timestamp(System.currentTimeMillis()).toString();
		}
	}
	public static boolean checkSDCard() {
		if (android.os.Environment.getExternalStorageState().equals(
				android.os.Environment.MEDIA_MOUNTED)) {
			return true;
		} else {
			return false;
		}
	}
	public static String setMkdir(Context context)
	{
		String filePath = null;
		if(checkSDCard())
		{
			filePath = Environment.getExternalStorageDirectory().getAbsolutePath()+File.separator+"sogouchat";
		} else {
			filePath = context.getCacheDir().getAbsolutePath()+File.separator+"sogouchat";
		}
		File file = new File(filePath);
		if(!file.exists())
		{
			boolean ret = false;
			ret = file.mkdir();
			Log.e("file", "目录不存在    创建目录    ");
		} else {
			Log.e("file", "目录存在");
		}
		return filePath;
	}
	public static String getPath(Context context,String url)
	{
		String path = null;
		try {
			path = FileUtil.setMkdir(context)+File.separator+url.substring(url.lastIndexOf("/")+1);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return path;
	}
	public static String FormetFileSize(int fileSize) {
		DecimalFormat df = new DecimalFormat("#.00");
		String fileSizeString = "";
		if (fileSize < 1024) {
			fileSizeString = df.format((double)fileSize) + "B";
		} else if (fileSize < 1048576) {
			fileSizeString = df.format((double)fileSize / 1024) + "K";
		} else if (fileSize < 1073741824) {
			fileSizeString = df.format((double)fileSize / 1048576) + "M";
		} else {
			fileSizeString = df.format((double)fileSize / 1073741824) + "G";
		}
		return fileSizeString;
	}

}