SDCardUtils

package com.leamiko.common.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;

/**
 * Operation about SD card
 * 
 * @Create 2013-6-17 
 */
public class SDCardUtils {

        /**
         * Check the SD card
         * 
         * @return
         */
        public static boolean checkSDCardAvailable() {
                return android.os.Environment.getExternalStorageState().equals(
                                android.os.Environment.MEDIA_MOUNTED);
        }
        
        /**
         * Check if the file is exists
         * @param filePath
         * @param fileName
         * @return
         */
        public static boolean isFileExistsInSDCard(String filePath, String fileName){
                boolean flag = false;
                if (checkSDCardAvailable()) {
                        File file = new File(filePath, fileName);
                        if (file.exists()) {
                                flag = true;
                        }
                }
                return flag;
        }

        /**
         * Write file to SD card
         * @param filePath
         * @param filename
         * @param content
         * @return
         * @throws Exception
         */
        public static boolean saveFileToSDCard(String filePath, String filename, String content)
                        throws Exception {
                boolean flag = false;
                if (checkSDCardAvailable()) {
                        File dir = new File(filePath);
                        if (!dir.exists()) {
                                dir.mkdir();
                        }
                        File file = new File(filePath, filename);
                        FileOutputStream outStream = new FileOutputStream(file);
                        outStream.write(content.getBytes());
                        outStream.close();
                        flag = true;
                }
                return flag;
        }

        /**
         * Read file as stream from SD card
         * 
         * @param fileName
         *            String PATH =
         *            Environment.getExternalStorageDirectory().getAbsolutePath() +
         *            "/dirName";
         * @return
         */
        public static byte[] readFileFromSDCard(String filePath, String fileName) {
                byte[] buffer = null;
                try {
                        if (checkSDCardAvailable()) {
                                String filePaht = filePath + "/" + fileName;
                                FileInputStream fin = new FileInputStream(filePaht);
                                int length = fin.available();
                                buffer = new byte[length];
                                fin.read(buffer);
                                fin.close();
                        }
                } catch (Exception e) {
                        e.printStackTrace();
                }
                return buffer;
        }

        /**
         * Delete file
         * 
         * @param filePath
         * @param fileName
         *            filePath =
         *            android.os.Environment.getExternalStorageDirectory().getPath()
         * @return
         */
        public static boolean deleteSDFile(String filePath, String fileName) {
                File file = new File(filePath + "/" + fileName);
                if (file == null || !file.exists() || file.isDirectory())
                        return false;
                return file.delete();
        }
}